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Repository: woltapp/blurhash
Branch: master
Commit: 712a47f946b9
Files: 112
Total size: 667.8 KB
Directory structure:
gitextract_k539n3_o/
├── .gitignore
├── .gitmodules
├── Algorithm.md
├── C/
│ ├── Makefile
│ ├── Readme.md
│ ├── common.h
│ ├── decode.c
│ ├── decode.h
│ ├── decode_stb.c
│ ├── encode.c
│ ├── encode.h
│ ├── encode_stb.c
│ ├── stb_image.h
│ └── stb_writer.h
├── CodeOfConduct.md
├── Kotlin/
│ ├── .gitignore
│ ├── Readme.md
│ ├── build.gradle
│ ├── demo/
│ │ ├── build.gradle
│ │ ├── proguard-rules.pro
│ │ └── src/
│ │ └── main/
│ │ ├── AndroidManifest.xml
│ │ ├── java/
│ │ │ └── com/
│ │ │ └── wolt/
│ │ │ └── blurhashapp/
│ │ │ └── MainActivity.kt
│ │ └── res/
│ │ ├── drawable/
│ │ │ ├── bg_blue_rounded_rect_8.xml
│ │ │ └── ic_launcher_background.xml
│ │ ├── drawable-v24/
│ │ │ └── ic_launcher_foreground.xml
│ │ ├── layout/
│ │ │ └── activity_main.xml
│ │ ├── mipmap-anydpi-v26/
│ │ │ ├── ic_launcher.xml
│ │ │ └── ic_launcher_round.xml
│ │ └── values/
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ ├── gradle/
│ │ └── wrapper/
│ │ ├── gradle-wrapper.jar
│ │ └── gradle-wrapper.properties
│ ├── gradle.properties
│ ├── gradlew
│ ├── gradlew.bat
│ ├── lib/
│ │ ├── build.gradle
│ │ ├── proguard-rules.pro
│ │ └── src/
│ │ ├── androidTest/
│ │ │ └── java/
│ │ │ └── com/
│ │ │ └── wolt/
│ │ │ └── blurhashkt/
│ │ │ └── BlurHashDecoderTest.kt
│ │ └── main/
│ │ ├── AndroidManifest.xml
│ │ └── java/
│ │ └── com/
│ │ └── wolt/
│ │ └── blurhashkt/
│ │ └── BlurHashDecoder.kt
│ └── settings.gradle
├── License.md
├── Media/
│ └── WhyBlurHash.afphoto
├── Readme.md
├── SECURITY.md
├── Swift/
│ ├── BlurHash.xcodeproj/
│ │ ├── project.pbxproj
│ │ ├── project.xcworkspace/
│ │ │ ├── contents.xcworkspacedata
│ │ │ └── xcshareddata/
│ │ │ ├── BlurHash.xcscmblueprint
│ │ │ └── IDEWorkspaceChecks.plist
│ │ └── xcshareddata/
│ │ └── xcschemes/
│ │ ├── BlurHashKit.xcscheme
│ │ ├── BlurHashTest.xcscheme
│ │ ├── blurhash.xcscheme
│ │ └── libBlurHashKit.xcscheme
│ ├── BlurHashDecode.swift
│ ├── BlurHashEncode.swift
│ ├── BlurHashKit/
│ │ ├── BlurHash.swift
│ │ ├── ColourProbes.swift
│ │ ├── ColourSpace.swift
│ │ ├── EscapeSequences.swift
│ │ ├── FromString.swift
│ │ ├── FromUIImage.swift
│ │ ├── Generation.swift
│ │ ├── Info.plist
│ │ ├── StringCoding.swift
│ │ ├── ToString.swift
│ │ ├── ToUIImage.swift
│ │ └── TupleMaths.swift
│ ├── BlurHashTest/
│ │ ├── AdvancedViewController.swift
│ │ ├── AppDelegate.swift
│ │ ├── Assets.xcassets/
│ │ │ └── AppIcon.appiconset/
│ │ │ └── Contents.json
│ │ ├── Base.lproj/
│ │ │ ├── LaunchScreen.storyboard
│ │ │ └── Main.storyboard
│ │ ├── GeneratedViewController.swift
│ │ ├── Info.plist
│ │ └── SimpleViewController.swift
│ ├── License.txt
│ └── Readme.md
├── TypeScript/
│ ├── .gitignore
│ ├── .npmignore
│ ├── .prettierrc
│ ├── CHANGELOG.md
│ ├── README.md
│ ├── demo/
│ │ └── index.html
│ ├── package.json
│ ├── src/
│ │ ├── base83.ts
│ │ ├── decode.ts
│ │ ├── demo.ts
│ │ ├── encode.ts
│ │ ├── error.ts
│ │ ├── index.ts
│ │ └── utils.ts
│ ├── tsconfig.json
│ ├── tsup.config.ts
│ └── webpack.config.js
└── Website/
├── .babelrc
├── .prettierrc
├── Readme.md
├── deploy.sh
├── package.json
├── src/
│ ├── constants.js
│ ├── index.ejs
│ ├── index.js
│ ├── index.scss
│ ├── sections/
│ │ ├── demo.js
│ │ └── hero.js
│ └── styles/
│ ├── averta.scss
│ ├── base.scss
│ ├── resets.scss
│ ├── utils.scss
│ └── variables.scss
└── webpack.config.js
================================================
FILE CONTENTS
================================================
================================================
FILE: .gitignore
================================================
## OS X specific
.DS_Store
## Various settings
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3
xcuserdata/
C/blurhash_encoder
C/blurhash_decoder
Ruby/.*
Ruby/Makefile
Python/build/
*.bundle
*.so
*.o
*.pyc
# Website
Website/node_modules/
Website/dist/
================================================
FILE: .gitmodules
================================================
[submodule "Python"]
path = Python
url = https://github.com/creditornot/blurhash-python.git
================================================
FILE: Algorithm.md
================================================
# BlurHash Algorithm
## Summary
BlurHash applies a simple [DCT transform](https://en.wikipedia.org/wiki/Discrete_cosine_transform) to the image data,
keeping only the first few components, and then encodes these components using a base 83 encoding, with a JSON,
HTML and shell-safe character set. The DC component, which represents the average colour of the image, is stored exactly
as an sRGB value, for easy use without implementing the full algorithm. The AC components are encoded lossily.
## Reference implementation
[Simplified Swift decoder implementation.](Swift/BlurHashDecode.swift)
[Simplified Swift encoder implementation.](Swift/BlurHashEncode.swift)
## Structure
Here follows an example of a BlurHash string, with the different parts labelled:
Example: LlMF%n00%#MwS|WCWEM{R*bbWBbH
Legend: 12333344....................
1. **Number of components, 1 digit.**
For a BlurHash with `nx` components along the X axis and `ny` components along the Y axis, this is equal to `(nx - 1) + (ny - 1) * 9`.
2. **Maximum AC component value, 1 digit.**
All AC components are scaled by this value. It represents a floating-point value of `(max + 1) / 166`.
3. **Average colour. 4 digits.**
The average colour of the image in sRGB space, encoded as a 24-bit RGB value, with R in the most significant position. This value can
be used directly if you only want the average colour rather than the full DCT-encoded image.
4. **AC components, 2 digits each, `nx * ny - 1` components in total.**
The AC components of the DCT transform, ordered by increasing X first, then Y. They are encoded as three values for `R`, `G` and `B`,
each between 0 and 18. They are combined together as `R * 19^2 + G * 19 + B`, for a total range of 0 to 6859.
Each value represents a floating-point value between -1 and 1. 0-8 represent negative values, 9 represents zero, and 10-18
represent positive values. Positive values are encoded as `((X - 9) / 9) ^ 2`, while negative
values are encoded as `-((9 - X) / 9 ) ^ 2`. `^` represents exponentiation. This value is then multiplied by the maximum AC
component value, field 2 above.
## Base 83
A custom base 83 encoding is used. Values are encoded individually, using 1 to 4 digits, and concatenated together. Multiple-digit
values are encoded in big-endian order, with the most significant digit first.
The character used set is `0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~`.
## Discrete Cosine Transform
To decode a single pixel of output, you loop over the DCT components and calculate a weighted sum of cosine functions. In
pseudocode, for a normalised pixel position `x`, `y`, with each coordinate ranging from 0 to 1, and components `Cij` ,
you calculate the following for each of R, G and B:
foreach j in 0 ... ny - 1
foreach i in 0 ... nx - 1
value = value + Cij * cos(x * i * pi) * cos(y * j * pi)
The `C00` component is the DC component, while the others are the AC components. The DC component must first be converted
from sRGB to linear RGB space. AC components are already linear.
Once the R, G and B values have been calculated, they must be converted from linear to your output colourspace, usually sRGB.
================================================
FILE: C/Makefile
================================================
PROGRAM=blurhash_encoder
DECODER=blurhash_decoder
$(PROGRAM): encode_stb.c encode.c encode.h stb_image.h common.h
$(CC) -o $@ encode_stb.c encode.c -lm -Ofast
$(DECODER): decode_stb.c decode.c decode.h stb_writer.h common.h
$(CC) -o $(DECODER) decode_stb.c decode.c -lm -Ofast
.PHONY: clean
clean:
rm -f $(PROGRAM)
rm -f $(DECODER)
================================================
FILE: C/Readme.md
================================================
# BlurHash encoder in portable C
This code implements an encoder for the BlurHash algorithm in C. It can be used to integrate into other language
using an FFI interface. Currently the Python integration uses this code.
## Usage as a library
Include the `encode.c` and `encode.h` files in your project. They have no external dependencies.
A single file function is defined:
const char *blurHashForPixels(int xComponents, int yComponents, int width, int height, uint8_t *rgb, size_t bytesPerRow) {
This function returns a string containing the BlurHash. This memory is managed by the function, and you should not free it.
It will be overwritten on the next call into the function, so be careful!
* `xComponents` - The number of components in the X direction. Must be between 1 and 9. 3 to 5 is usually a good range for this.
* `yComponents` - The number of components in the Y direction. Must be between 1 and 9. 3 to 5 is usually a good range for this.
* `width` - The width in pixels of the supplied image.
* `height` - The height in pixels of the supplied image.
* `rgb` - A pointer to the pixel data. This is supplied in RGB order, with 3 bytes per pixels.
* `bytesPerRow` - The number of bytes per row of the RGB pixel data.
## Usage as a command-line tool
You can also build a command-line version to test the encoder and decoder. However, note that it uses `stb_image` to load images,
which is not really security-hardened, so it is **not** recommended to use this version in production on untrusted data!
Use one of the integrations instead, which use more robust image loading libraries.
Nevertheless, if you want to try it out quickly, simply run:
$ make blurhash_encoder
$ ./blurhash_encoder 4 3 ../Swift/BlurHashTest/pic1.png
LaJHjmVu8_~po#smR+a~xaoLWCRj
If you want to try out the decoder, simply run:
$ make blurhash_decoder
$ ./blurhash_decoder "LaJHjmVu8_~po#smR+a~xaoLWCRj" 32 32 decoded_output.png
================================================
FILE: C/common.h
================================================
#ifndef __BLURHASH_COMMON_H__
#define __BLURHASH_COMMON_H__
#include<math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
static inline int linearTosRGB(float value) {
float v = fmaxf(0, fminf(1, value));
if(v <= 0.0031308) return v * 12.92 * 255 + 0.5;
else return (1.055 * powf(v, 1 / 2.4) - 0.055) * 255 + 0.5;
}
static inline float sRGBToLinear(int value) {
float v = (float)value / 255;
if(v <= 0.04045) return v / 12.92;
else return powf((v + 0.055) / 1.055, 2.4);
}
static inline float signPow(float value, float exp) {
return copysignf(powf(fabsf(value), exp), value);
}
#endif
================================================
FILE: C/decode.c
================================================
#include "decode.h"
#include "common.h"
static char chars[83] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~";
static inline uint8_t clampToUByte(int * src) {
if( *src >= 0 && *src <= 255 )
return *src;
return (*src < 0) ? 0 : 255;
}
static inline uint8_t * createByteArray(int size) {
return (uint8_t *)malloc(size * sizeof(uint8_t));
}
int decodeToInt(const char * string, int start, int end) {
int value = 0, iter1 = 0, iter2 = 0;
for( iter1 = start; iter1 < end; iter1 ++) {
int index = -1;
for(iter2 = 0; iter2 < 83; iter2 ++) {
if (chars[iter2] == string[iter1]) {
index = iter2;
break;
}
}
if (index == -1) return -1;
value = value * 83 + index;
}
return value;
}
bool isValidBlurhash(const char * blurhash) {
const int hashLength = strlen(blurhash);
if ( !blurhash || strlen(blurhash) < 6) return false;
int sizeFlag = decodeToInt(blurhash, 0, 1); //Get size from first character
int numY = (int)floorf(sizeFlag / 9) + 1;
int numX = (sizeFlag % 9) + 1;
if (hashLength != 4 + 2 * numX * numY) return false;
return true;
}
void decodeDC(int value, float * r, float * g, float * b) {
*r = sRGBToLinear(value >> 16); // R-component
*g = sRGBToLinear((value >> 8) & 255); // G-Component
*b = sRGBToLinear(value & 255); // B-Component
}
void decodeAC(int value, float maximumValue, float * r, float * g, float * b) {
int quantR = (int)floorf(value / (19 * 19));
int quantG = (int)floorf(value / 19) % 19;
int quantB = (int)value % 19;
*r = signPow(((float)quantR - 9) / 9, 2.0) * maximumValue;
*g = signPow(((float)quantG - 9) / 9, 2.0) * maximumValue;
*b = signPow(((float)quantB - 9) / 9, 2.0) * maximumValue;
}
int decodeToArray(const char * blurhash, int width, int height, int punch, int nChannels, uint8_t * pixelArray) {
if (! isValidBlurhash(blurhash)) return -1;
if (punch < 1) punch = 1;
int sizeFlag = decodeToInt(blurhash, 0, 1);
int numY = (int)floorf(sizeFlag / 9) + 1;
int numX = (sizeFlag % 9) + 1;
int iter = 0;
float r = 0, g = 0, b = 0;
int quantizedMaxValue = decodeToInt(blurhash, 1, 2);
if (quantizedMaxValue == -1) return -1;
float maxValue = ((float)(quantizedMaxValue + 1)) / 166;
int colors_size = numX * numY;
float colors[colors_size][3];
for(iter = 0; iter < colors_size; iter ++) {
if (iter == 0) {
int value = decodeToInt(blurhash, 2, 6);
if (value == -1) return -1;
decodeDC(value, &r, &g, &b);
colors[iter][0] = r;
colors[iter][1] = g;
colors[iter][2] = b;
} else {
int value = decodeToInt(blurhash, 4 + iter * 2, 6 + iter * 2);
if (value == -1) return -1;
decodeAC(value, maxValue * punch, &r, &g, &b);
colors[iter][0] = r;
colors[iter][1] = g;
colors[iter][2] = b;
}
}
int bytesPerRow = width * nChannels;
int x = 0, y = 0, i = 0, j = 0;
int intR = 0, intG = 0, intB = 0;
for(y = 0; y < height; y ++) {
for(x = 0; x < width; x ++) {
float r = 0, g = 0, b = 0;
for(j = 0; j < numY; j ++) {
for(i = 0; i < numX; i ++) {
float basics = cos((M_PI * x * i) / width) * cos((M_PI * y * j) / height);
int idx = i + j * numX;
r += colors[idx][0] * basics;
g += colors[idx][1] * basics;
b += colors[idx][2] * basics;
}
}
intR = linearTosRGB(r);
intG = linearTosRGB(g);
intB = linearTosRGB(b);
pixelArray[nChannels * x + 0 + y * bytesPerRow] = clampToUByte(&intR);
pixelArray[nChannels * x + 1 + y * bytesPerRow] = clampToUByte(&intG);
pixelArray[nChannels * x + 2 + y * bytesPerRow] = clampToUByte(&intB);
if (nChannels == 4)
pixelArray[nChannels * x + 3 + y * bytesPerRow] = 255; // If nChannels=4, treat each pixel as RGBA instead of RGB
}
}
return 0;
}
uint8_t * decode(const char * blurhash, int width, int height, int punch, int nChannels) {
int bytesPerRow = width * nChannels;
uint8_t * pixelArray = createByteArray(bytesPerRow * height);
if (decodeToArray(blurhash, width, height, punch, nChannels, pixelArray) == -1)
return NULL;
return pixelArray;
}
void freePixelArray(uint8_t * pixelArray) {
if (pixelArray) {
free(pixelArray);
}
}
================================================
FILE: C/decode.h
================================================
#ifndef __BLURHASH_DECODE_H__
#define __BLURHASH_DECODE_H__
#include <math.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
/*
decode : Returns the pixel array of the result image given the blurhash string,
Parameters :
blurhash : A string representing the blurhash to be decoded.
width : Width of the resulting image
height : Height of the resulting image
punch : The factor to improve the contrast, default = 1
nChannels : Number of channels in the resulting image array, 3 = RGB, 4 = RGBA
Returns : A pointer to memory region where pixels are stored in (H, W, C) format
*/
uint8_t * decode(const char * blurhash, int width, int height, int punch, int nChannels);
/*
decodeToArray : Decodes the blurhash and copies the pixels to pixelArray,
This method is suggested if you use an external memory allocator for pixelArray.
pixelArray should be of size : width * height * nChannels
Parameters :
blurhash : A string representing the blurhash to be decoded.
width : Width of the resulting image
height : Height of the resulting image
punch : The factor to improve the contrast, default = 1
nChannels : Number of channels in the resulting image array, 3 = RGB, 4 = RGBA
pixelArray : Pointer to memory region where pixels needs to be copied.
Returns : int, -1 if error 0 if successful
*/
int decodeToArray(const char * blurhash, int width, int height, int punch, int nChannels, uint8_t * pixelArray);
/*
isValidBlurhash : Checks if the Blurhash is valid or not.
Parameters :
blurhash : A string representing the blurhash
Returns : bool (true if it is a valid blurhash, else false)
*/
bool isValidBlurhash(const char * blurhash);
/*
freePixelArray : Frees the pixel array
Parameters :
pixelArray : Pixel array pointer which will be freed.
Returns : void (None)
*/
void freePixelArray(uint8_t * pixelArray);
#endif
================================================
FILE: C/decode_stb.c
================================================
#include "decode.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_writer.h"
int main(int argc, char **argv) {
if(argc < 5) {
fprintf(stderr, "Usage: %s hash width height output_file [punch]\n", argv[0]);
return 1;
}
int width, height, punch = 1;
char * hash = argv[1];
width = atoi(argv[2]);
height = atoi(argv[3]);
char * output_file = argv[4];
const int nChannels = 4;
if(argc == 6)
punch = atoi(argv[5]);
uint8_t * bytes = decode(hash, width, height, punch, nChannels);
if (!bytes) {
fprintf(stderr, "%s is not a valid blurhash, decoding failed.\n", hash);
return 1;
}
if (stbi_write_png(output_file, width, height, nChannels, bytes, nChannels * width) == 0) {
fprintf(stderr, "Failed to write PNG file %s\n", output_file);
return 1;
}
freePixelArray(bytes);
fprintf(stdout, "Decoded blurhash successfully, wrote PNG file %s\n", output_file);
return 0;
}
================================================
FILE: C/encode.c
================================================
#include "encode.h"
#include "common.h"
#include <string.h>
static float *multiplyBasisFunction(int xComponent, int yComponent, int width, int height, uint8_t *rgb, size_t bytesPerRow);
static char *encode_int(int value, int length, char *destination);
static int encodeDC(float r, float g, float b);
static int encodeAC(float r, float g, float b, float maximumValue);
const char *blurHashForPixels(int xComponents, int yComponents, int width, int height, uint8_t *rgb, size_t bytesPerRow) {
static char buffer[2 + 4 + (9 * 9 - 1) * 2 + 1];
if(xComponents < 1 || xComponents > 9) return NULL;
if(yComponents < 1 || yComponents > 9) return NULL;
float factors[yComponents][xComponents][3];
memset(factors, 0, sizeof(factors));
for(int y = 0; y < yComponents; y++) {
for(int x = 0; x < xComponents; x++) {
float *factor = multiplyBasisFunction(x, y, width, height, rgb, bytesPerRow);
factors[y][x][0] = factor[0];
factors[y][x][1] = factor[1];
factors[y][x][2] = factor[2];
}
}
float *dc = factors[0][0];
float *ac = dc + 3;
int acCount = xComponents * yComponents - 1;
char *ptr = buffer;
int sizeFlag = (xComponents - 1) + (yComponents - 1) * 9;
ptr = encode_int(sizeFlag, 1, ptr);
float maximumValue;
if(acCount > 0) {
float actualMaximumValue = 0;
for(int i = 0; i < acCount * 3; i++) {
actualMaximumValue = fmaxf(fabsf(ac[i]), actualMaximumValue);
}
int quantisedMaximumValue = fmaxf(0, fminf(82, floorf(actualMaximumValue * 166 - 0.5)));
maximumValue = ((float)quantisedMaximumValue + 1) / 166;
ptr = encode_int(quantisedMaximumValue, 1, ptr);
} else {
maximumValue = 1;
ptr = encode_int(0, 1, ptr);
}
ptr = encode_int(encodeDC(dc[0], dc[1], dc[2]), 4, ptr);
for(int i = 0; i < acCount; i++) {
ptr = encode_int(encodeAC(ac[i * 3 + 0], ac[i * 3 + 1], ac[i * 3 + 2], maximumValue), 2, ptr);
}
*ptr = 0;
return buffer;
}
static float *multiplyBasisFunction(int xComponent, int yComponent, int width, int height, uint8_t *rgb, size_t bytesPerRow) {
float r = 0, g = 0, b = 0;
float normalisation = (xComponent == 0 && yComponent == 0) ? 1 : 2;
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
float basis = cosf(M_PI * xComponent * x / width) * cosf(M_PI * yComponent * y / height);
r += basis * sRGBToLinear(rgb[3 * x + 0 + y * bytesPerRow]);
g += basis * sRGBToLinear(rgb[3 * x + 1 + y * bytesPerRow]);
b += basis * sRGBToLinear(rgb[3 * x + 2 + y * bytesPerRow]);
}
}
float scale = normalisation / (width * height);
static float result[3];
result[0] = r * scale;
result[1] = g * scale;
result[2] = b * scale;
return result;
}
static int encodeDC(float r, float g, float b) {
int roundedR = linearTosRGB(r);
int roundedG = linearTosRGB(g);
int roundedB = linearTosRGB(b);
return (roundedR << 16) + (roundedG << 8) + roundedB;
}
static int encodeAC(float r, float g, float b, float maximumValue) {
int quantR = fmaxf(0, fminf(18, floorf(signPow(r / maximumValue, 0.5) * 9 + 9.5)));
int quantG = fmaxf(0, fminf(18, floorf(signPow(g / maximumValue, 0.5) * 9 + 9.5)));
int quantB = fmaxf(0, fminf(18, floorf(signPow(b / maximumValue, 0.5) * 9 + 9.5)));
return quantR * 19 * 19 + quantG * 19 + quantB;
}
static char characters[83]="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~";
static char *encode_int(int value, int length, char *destination) {
int divisor = 1;
for(int i = 0; i < length - 1; i++) divisor *= 83;
for(int i = 0; i < length; i++) {
int digit = (value / divisor) % 83;
divisor /= 83;
*destination++ = characters[digit];
}
return destination;
}
================================================
FILE: C/encode.h
================================================
#ifndef __BLURHASH_ENCODE_H__
#define __BLURHASH_ENCODE_H__
#include <stdint.h>
#include <stdlib.h>
const char *blurHashForPixels(int xComponents, int yComponents, int width, int height, uint8_t *rgb, size_t bytesPerRow);
#endif
================================================
FILE: C/encode_stb.c
================================================
#include "encode.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#include <stdio.h>
const char *blurHashForFile(int xComponents, int yComponents,const char *filename);
int main(int argc, const char **argv) {
if(argc != 4) {
fprintf(stderr, "Usage: %s x_components y_components imagefile\n", argv[0]);
return 1;
}
int xComponents = atoi(argv[1]);
int yComponents = atoi(argv[2]);
if(xComponents < 1 || xComponents > 8 || yComponents < 1 || yComponents > 8) {
fprintf(stderr, "Component counts must be between 1 and 8.\n");
return 1;
}
const char *hash = blurHashForFile(xComponents, yComponents, argv[3]);
if(!hash) {
fprintf(stderr, "Failed to load image file \"%s\".\n", argv[3]);
return 1;
}
printf("%s\n", hash);
return 0;
}
const char *blurHashForFile(int xComponents, int yComponents,const char *filename) {
int width, height, channels;
unsigned char *data = stbi_load(filename, &width, &height, &channels, 3);
if(!data) return NULL;
const char *hash = blurHashForPixels(xComponents, yComponents, width, height, data, width * 3);
stbi_image_free(data);
return hash;
}
================================================
FILE: C/stb_image.h
================================================
/* stb_image - v2.15 - public domain image loader - http://nothings.org/stb_image.h
no warranty implied; use at your own risk
Do this:
#define STB_IMAGE_IMPLEMENTATION
before you include this file in *one* C or C++ file to create the implementation.
// i.e. it should look like this:
#include ...
#include ...
#include ...
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
QUICK NOTES:
Primarily of interest to game developers and other people who can
avoid problematic images and only need the trivial interface
JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
PNG 1/2/4/8/16-bit-per-channel
TGA (not sure what subset, if a subset)
BMP non-1bpp, non-RLE
PSD (composited view only, no extra channels, 8/16 bit-per-channel)
GIF (*comp always reports as 4-channel)
HDR (radiance rgbE format)
PIC (Softimage PIC)
PNM (PPM and PGM binary only)
Animated GIF still needs a proper API, but here's one way to do it:
http://gist.github.com/urraka/685d9a6340b26b830d49
- decode from memory or through FILE (define STBI_NO_STDIO to remove code)
- decode from arbitrary I/O callbacks
- SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
Full documentation under "DOCUMENTATION" below.
LICENSE
See end of file for license information.
RECENT REVISION HISTORY:
2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC
2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
RGB-format JPEG; remove white matting in PSD;
allocate large structures on the stack;
correct channel count for PNG & BMP
2.10 (2016-01-22) avoid warning introduced in 2.09
2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
2.07 (2015-09-13) partial animated GIF support
limited 16-bit PSD support
minor bugs, code cleanup, and compiler warnings
See end of file for full revision history.
============================ Contributors =========================
Image formats Extensions, features
Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info)
Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info)
Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG)
Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks)
Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG)
Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip)
Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD)
github:urraka (animated gif) Junggon Kim (PNM comments)
Daniel Gibson (16-bit TGA)
socks-the-fox (16-bit PNG)
Jeremy Sawicki (handle all ImageNet JPGs)
Optimizations & bugfixes
Fabian "ryg" Giesen
Arseny Kapoulkine
Bug & warning fixes
Marc LeBlanc David Woo Guillaume George Martins Mozeiko
Christpher Lloyd Jerry Jansson Joseph Thomson Phil Jordan
Dave Moore Roy Eltham Hayaki Saito Nathan Reed
Won Chun Luke Graham Johan Duparc Nick Verigakis
the Horde3D community Thomas Ruf Ronny Chevalier Baldur Karlsson
Janez Zemva John Bartholomew Michal Cichon github:rlyeh
Jonathan Blow Ken Hamada Tero Hanninen github:romigrou
Laurent Gomila Cort Stratton Sergio Gonzalez github:svdijk
Aruelien Pocheville Thibault Reuille Cass Everitt github:snagar
Ryamond Barbiero Paul Du Bois Engin Manap github:Zelex
Michaelangel007@github Philipp Wiesemann Dale Weiler github:grim210
Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:sammyhw
Blazej Dariusz Roszkowski Gregory Mullen github:phprus
*/
#ifndef STBI_INCLUDE_STB_IMAGE_H
#define STBI_INCLUDE_STB_IMAGE_H
// DOCUMENTATION
//
// Limitations:
// - no 16-bit-per-channel PNG
// - no 12-bit-per-channel JPEG
// - no JPEGs with arithmetic coding
// - no 1-bit BMP
// - GIF always returns *comp=4
//
// Basic usage (see HDR discussion below for HDR usage):
// int x,y,n;
// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
// // ... process data if not NULL ...
// // ... x = width, y = height, n = # 8-bit components per pixel ...
// // ... replace '0' with '1'..'4' to force that many components per pixel
// // ... but 'n' will always be the number that it would have been if you said 0
// stbi_image_free(data)
//
// Standard parameters:
// int *x -- outputs image width in pixels
// int *y -- outputs image height in pixels
// int *channels_in_file -- outputs # of image components in image file
// int desired_channels -- if non-zero, # of image components requested in result
//
// The return value from an image loader is an 'unsigned char *' which points
// to the pixel data, or NULL on an allocation failure or if the image is
// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
// with each pixel consisting of N interleaved 8-bit components; the first
// pixel pointed to is top-left-most in the image. There is no padding between
// image scanlines or between pixels, regardless of format. The number of
// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
// If req_comp is non-zero, *comp has the number of components that _would_
// have been output otherwise. E.g. if you set req_comp to 4, you will always
// get RGBA output, but you can check *comp to see if it's trivially opaque
// because e.g. there were only 3 channels in the source image.
//
// An output image with N components has the following components interleaved
// in this order in each pixel:
//
// N=#comp components
// 1 grey
// 2 grey, alpha
// 3 red, green, blue
// 4 red, green, blue, alpha
//
// If image loading fails for any reason, the return value will be NULL,
// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
// can be queried for an extremely brief, end-user unfriendly explanation
// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
// more user-friendly ones.
//
// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
//
// ===========================================================================
//
// Philosophy
//
// stb libraries are designed with the following priorities:
//
// 1. easy to use
// 2. easy to maintain
// 3. good performance
//
// Sometimes I let "good performance" creep up in priority over "easy to maintain",
// and for best performance I may provide less-easy-to-use APIs that give higher
// performance, in addition to the easy to use ones. Nevertheless, it's important
// to keep in mind that from the standpoint of you, a client of this library,
// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all.
//
// Some secondary priorities arise directly from the first two, some of which
// make more explicit reasons why performance can't be emphasized.
//
// - Portable ("ease of use")
// - Small source code footprint ("easy to maintain")
// - No dependencies ("ease of use")
//
// ===========================================================================
//
// I/O callbacks
//
// I/O callbacks allow you to read from arbitrary sources, like packaged
// files or some other source. Data read from callbacks are processed
// through a small internal buffer (currently 128 bytes) to try to reduce
// overhead.
//
// The three functions you must define are "read" (reads some bytes of data),
// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
//
// ===========================================================================
//
// SIMD support
//
// The JPEG decoder will try to automatically use SIMD kernels on x86 when
// supported by the compiler. For ARM Neon support, you must explicitly
// request it.
//
// (The old do-it-yourself SIMD API is no longer supported in the current
// code.)
//
// On x86, SSE2 will automatically be used when available based on a run-time
// test; if not, the generic C versions are used as a fall-back. On ARM targets,
// the typical path is to have separate builds for NEON and non-NEON devices
// (at least this is true for iOS and Android). Therefore, the NEON support is
// toggled by a build flag: define STBI_NEON to get NEON loops.
//
// If for some reason you do not want to use any of SIMD code, or if
// you have issues compiling it, you can disable it entirely by
// defining STBI_NO_SIMD.
//
// ===========================================================================
//
// HDR image support (disable by defining STBI_NO_HDR)
//
// stb_image now supports loading HDR images in general, and currently
// the Radiance .HDR file format, although the support is provided
// generically. You can still load any file through the existing interface;
// if you attempt to load an HDR file, it will be automatically remapped to
// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
// both of these constants can be reconfigured through this interface:
//
// stbi_hdr_to_ldr_gamma(2.2f);
// stbi_hdr_to_ldr_scale(1.0f);
//
// (note, do not use _inverse_ constants; stbi_image will invert them
// appropriately).
//
// Additionally, there is a new, parallel interface for loading files as
// (linear) floats to preserve the full dynamic range:
//
// float *data = stbi_loadf(filename, &x, &y, &n, 0);
//
// If you load LDR images through this interface, those images will
// be promoted to floating point values, run through the inverse of
// constants corresponding to the above:
//
// stbi_ldr_to_hdr_scale(1.0f);
// stbi_ldr_to_hdr_gamma(2.2f);
//
// Finally, given a filename (or an open file or memory block--see header
// file for details) containing image data, you can query for the "most
// appropriate" interface to use (that is, whether the image is HDR or
// not), using:
//
// stbi_is_hdr(char *filename);
//
// ===========================================================================
//
// iPhone PNG support:
//
// By default we convert iphone-formatted PNGs back to RGB, even though
// they are internally encoded differently. You can disable this conversion
// by by calling stbi_convert_iphone_png_to_rgb(0), in which case
// you will always just get the native iphone "format" through (which
// is BGR stored in RGB).
//
// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
// pixel to remove any premultiplied alpha *only* if the image file explicitly
// says there's premultiplied data (currently only happens in iPhone images,
// and only if iPhone convert-to-rgb processing is on).
//
// ===========================================================================
//
// ADDITIONAL CONFIGURATION
//
// - You can suppress implementation of any of the decoders to reduce
// your code footprint by #defining one or more of the following
// symbols before creating the implementation.
//
// STBI_NO_JPEG
// STBI_NO_PNG
// STBI_NO_BMP
// STBI_NO_PSD
// STBI_NO_TGA
// STBI_NO_GIF
// STBI_NO_HDR
// STBI_NO_PIC
// STBI_NO_PNM (.ppm and .pgm)
//
// - You can request *only* certain decoders and suppress all other ones
// (this will be more forward-compatible, as addition of new decoders
// doesn't require you to disable them explicitly):
//
// STBI_ONLY_JPEG
// STBI_ONLY_PNG
// STBI_ONLY_BMP
// STBI_ONLY_PSD
// STBI_ONLY_TGA
// STBI_ONLY_GIF
// STBI_ONLY_HDR
// STBI_ONLY_PIC
// STBI_ONLY_PNM (.ppm and .pgm)
//
// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
//
#ifndef STBI_NO_STDIO
#include <stdio.h>
#endif // STBI_NO_STDIO
#define STBI_VERSION 1
enum
{
STBI_default = 0, // only used for req_comp
STBI_grey = 1,
STBI_grey_alpha = 2,
STBI_rgb = 3,
STBI_rgb_alpha = 4
};
typedef unsigned char stbi_uc;
typedef unsigned short stbi_us;
#ifdef __cplusplus
extern "C" {
#endif
#ifdef STB_IMAGE_STATIC
#define STBIDEF static
#else
#define STBIDEF extern
#endif
//////////////////////////////////////////////////////////////////////////////
//
// PRIMARY API - works on images of any type
//
//
// load image by filename, open file, or memory buffer
//
typedef struct
{
int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
int (*eof) (void *user); // returns nonzero if we are at end of file/data
} stbi_io_callbacks;
////////////////////////////////////
//
// 8-bits-per-channel interface
//
STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels);
STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
#ifndef STBI_NO_STDIO
STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
// for stbi_load_from_file, file pointer is left pointing immediately after image
#endif
////////////////////////////////////
//
// 16-bits-per-channel interface
//
STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
#ifndef STBI_NO_STDIO
STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
#endif
// @TODO the other variants
////////////////////////////////////
//
// float-per-channel interface
//
#ifndef STBI_NO_LINEAR
STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
#ifndef STBI_NO_STDIO
STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
#endif
#endif
#ifndef STBI_NO_HDR
STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
STBIDEF void stbi_hdr_to_ldr_scale(float scale);
#endif // STBI_NO_HDR
#ifndef STBI_NO_LINEAR
STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
STBIDEF void stbi_ldr_to_hdr_scale(float scale);
#endif // STBI_NO_LINEAR
// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
#ifndef STBI_NO_STDIO
STBIDEF int stbi_is_hdr (char const *filename);
STBIDEF int stbi_is_hdr_from_file(FILE *f);
#endif // STBI_NO_STDIO
// get a VERY brief reason for failure
// NOT THREADSAFE
STBIDEF const char *stbi_failure_reason (void);
// free the loaded image -- this is just free()
STBIDEF void stbi_image_free (void *retval_from_stbi_load);
// get image dimensions & components without fully decoding
STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
#ifndef STBI_NO_STDIO
STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp);
STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
#endif
// for image formats that explicitly notate that they have premultiplied alpha,
// we just return the colors as stored in the file. set this flag to force
// unpremultiplication. results are undefined if the unpremultiply overflow.
STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
// indicate whether we should process iphone images back to canonical format,
// or just pass them through "as-is"
STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
// flip the image vertically, so the first pixel in the output array is the bottom left
STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
// ZLIB client - used by PNG, available for other purposes
STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
#ifdef __cplusplus
}
#endif
//
//
//// end header file /////////////////////////////////////////////////////
#endif // STBI_INCLUDE_STB_IMAGE_H
#ifdef STB_IMAGE_IMPLEMENTATION
#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
|| defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
|| defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
|| defined(STBI_ONLY_ZLIB)
#ifndef STBI_ONLY_JPEG
#define STBI_NO_JPEG
#endif
#ifndef STBI_ONLY_PNG
#define STBI_NO_PNG
#endif
#ifndef STBI_ONLY_BMP
#define STBI_NO_BMP
#endif
#ifndef STBI_ONLY_PSD
#define STBI_NO_PSD
#endif
#ifndef STBI_ONLY_TGA
#define STBI_NO_TGA
#endif
#ifndef STBI_ONLY_GIF
#define STBI_NO_GIF
#endif
#ifndef STBI_ONLY_HDR
#define STBI_NO_HDR
#endif
#ifndef STBI_ONLY_PIC
#define STBI_NO_PIC
#endif
#ifndef STBI_ONLY_PNM
#define STBI_NO_PNM
#endif
#endif
#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
#define STBI_NO_ZLIB
#endif
#include <stdarg.h>
#include <stddef.h> // ptrdiff_t on osx
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
#include <math.h> // ldexp
#endif
#ifndef STBI_NO_STDIO
#include <stdio.h>
#endif
#ifndef STBI_ASSERT
#include <assert.h>
#define STBI_ASSERT(x) assert(x)
#endif
#ifndef _MSC_VER
#ifdef __cplusplus
#define stbi_inline inline
#else
#define stbi_inline
#endif
#else
#define stbi_inline __forceinline
#endif
#ifdef _MSC_VER
typedef unsigned short stbi__uint16;
typedef signed short stbi__int16;
typedef unsigned int stbi__uint32;
typedef signed int stbi__int32;
#else
#include <stdint.h>
typedef uint16_t stbi__uint16;
typedef int16_t stbi__int16;
typedef uint32_t stbi__uint32;
typedef int32_t stbi__int32;
#endif
// should produce compiler error if size is wrong
typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
#ifdef _MSC_VER
#define STBI_NOTUSED(v) (void)(v)
#else
#define STBI_NOTUSED(v) (void)sizeof(v)
#endif
#ifdef _MSC_VER
#define STBI_HAS_LROTL
#endif
#ifdef STBI_HAS_LROTL
#define stbi_lrot(x,y) _lrotl(x,y)
#else
#define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y))))
#endif
#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
// ok
#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
// ok
#else
#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
#endif
#ifndef STBI_MALLOC
#define STBI_MALLOC(sz) malloc(sz)
#define STBI_REALLOC(p,newsz) realloc(p,newsz)
#define STBI_FREE(p) free(p)
#endif
#ifndef STBI_REALLOC_SIZED
#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
#endif
// x86/x64 detection
#if defined(__x86_64__) || defined(_M_X64)
#define STBI__X64_TARGET
#elif defined(__i386) || defined(_M_IX86)
#define STBI__X86_TARGET
#endif
#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
// but previous attempts to provide the SSE2 functions with runtime
// detection caused numerous issues. The way architecture extensions are
// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
// New behavior: if compiled with -msse2, we use SSE2 without any
// detection; if not, we don't use it at all.
#define STBI_NO_SIMD
#endif
#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
//
// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
// simultaneously enabling "-mstackrealign".
//
// See https://github.com/nothings/stb/issues/81 for more information.
//
// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
#define STBI_NO_SIMD
#endif
#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
#define STBI_SSE2
#include <emmintrin.h>
#ifdef _MSC_VER
#if _MSC_VER >= 1400 // not VC6
#include <intrin.h> // __cpuid
static int stbi__cpuid3(void)
{
int info[4];
__cpuid(info,1);
return info[3];
}
#else
static int stbi__cpuid3(void)
{
int res;
__asm {
mov eax,1
cpuid
mov res,edx
}
return res;
}
#endif
#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
static int stbi__sse2_available()
{
int info3 = stbi__cpuid3();
return ((info3 >> 26) & 1) != 0;
}
#else // assume GCC-style if not VC++
#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
static int stbi__sse2_available()
{
// If we're even attempting to compile this on GCC/Clang, that means
// -msse2 is on, which means the compiler is allowed to use SSE2
// instructions at will, and so are we.
return 1;
}
#endif
#endif
// ARM NEON
#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
#undef STBI_NEON
#endif
#ifdef STBI_NEON
#include <arm_neon.h>
// assume GCC or Clang on ARM targets
#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
#endif
#ifndef STBI_SIMD_ALIGN
#define STBI_SIMD_ALIGN(type, name) type name
#endif
///////////////////////////////////////////////
//
// stbi__context struct and start_xxx functions
// stbi__context structure is our basic context used by all images, so it
// contains all the IO context, plus some basic image information
typedef struct
{
stbi__uint32 img_x, img_y;
int img_n, img_out_n;
stbi_io_callbacks io;
void *io_user_data;
int read_from_callbacks;
int buflen;
stbi_uc buffer_start[128];
stbi_uc *img_buffer, *img_buffer_end;
stbi_uc *img_buffer_original, *img_buffer_original_end;
} stbi__context;
static void stbi__refill_buffer(stbi__context *s);
// initialize a memory-decode context
static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
{
s->io.read = NULL;
s->read_from_callbacks = 0;
s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
}
// initialize a callback-based context
static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
{
s->io = *c;
s->io_user_data = user;
s->buflen = sizeof(s->buffer_start);
s->read_from_callbacks = 1;
s->img_buffer_original = s->buffer_start;
stbi__refill_buffer(s);
s->img_buffer_original_end = s->img_buffer_end;
}
#ifndef STBI_NO_STDIO
static int stbi__stdio_read(void *user, char *data, int size)
{
return (int) fread(data,1,size,(FILE*) user);
}
static void stbi__stdio_skip(void *user, int n)
{
fseek((FILE*) user, n, SEEK_CUR);
}
static int stbi__stdio_eof(void *user)
{
return feof((FILE*) user);
}
static stbi_io_callbacks stbi__stdio_callbacks =
{
stbi__stdio_read,
stbi__stdio_skip,
stbi__stdio_eof,
};
static void stbi__start_file(stbi__context *s, FILE *f)
{
stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
}
//static void stop_file(stbi__context *s) { }
#endif // !STBI_NO_STDIO
static void stbi__rewind(stbi__context *s)
{
// conceptually rewind SHOULD rewind to the beginning of the stream,
// but we just rewind to the beginning of the initial buffer, because
// we only use it after doing 'test', which only ever looks at at most 92 bytes
s->img_buffer = s->img_buffer_original;
s->img_buffer_end = s->img_buffer_original_end;
}
enum
{
STBI_ORDER_RGB,
STBI_ORDER_BGR
};
typedef struct
{
int bits_per_channel;
int num_channels;
int channel_order;
} stbi__result_info;
#ifndef STBI_NO_JPEG
static int stbi__jpeg_test(stbi__context *s);
static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PNG
static int stbi__png_test(stbi__context *s);
static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_BMP
static int stbi__bmp_test(stbi__context *s);
static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_TGA
static int stbi__tga_test(stbi__context *s);
static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PSD
static int stbi__psd_test(stbi__context *s);
static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc);
static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_HDR
static int stbi__hdr_test(stbi__context *s);
static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PIC
static int stbi__pic_test(stbi__context *s);
static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_GIF
static int stbi__gif_test(stbi__context *s);
static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PNM
static int stbi__pnm_test(stbi__context *s);
static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
#endif
// this is not threadsafe
static const char *stbi__g_failure_reason;
STBIDEF const char *stbi_failure_reason(void)
{
return stbi__g_failure_reason;
}
static int stbi__err(const char *str)
{
stbi__g_failure_reason = str;
return 0;
}
static void *stbi__malloc(size_t size)
{
return STBI_MALLOC(size);
}
// stb_image uses ints pervasively, including for offset calculations.
// therefore the largest decoded image size we can support with the
// current code, even on 64-bit targets, is INT_MAX. this is not a
// significant limitation for the intended use case.
//
// we do, however, need to make sure our size calculations don't
// overflow. hence a few helper functions for size calculations that
// multiply integers together, making sure that they're non-negative
// and no overflow occurs.
// return 1 if the sum is valid, 0 on overflow.
// negative terms are considered invalid.
static int stbi__addsizes_valid(int a, int b)
{
if (b < 0) return 0;
// now 0 <= b <= INT_MAX, hence also
// 0 <= INT_MAX - b <= INTMAX.
// And "a + b <= INT_MAX" (which might overflow) is the
// same as a <= INT_MAX - b (no overflow)
return a <= INT_MAX - b;
}
// returns 1 if the product is valid, 0 on overflow.
// negative factors are considered invalid.
static int stbi__mul2sizes_valid(int a, int b)
{
if (a < 0 || b < 0) return 0;
if (b == 0) return 1; // mul-by-0 is always safe
// portable way to check for no overflows in a*b
return a <= INT_MAX/b;
}
// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
static int stbi__mad2sizes_valid(int a, int b, int add)
{
return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add);
}
// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
static int stbi__mad3sizes_valid(int a, int b, int c, int add)
{
return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
stbi__addsizes_valid(a*b*c, add);
}
// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
{
return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add);
}
// mallocs with size overflow checking
static void *stbi__malloc_mad2(int a, int b, int add)
{
if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
return stbi__malloc(a*b + add);
}
static void *stbi__malloc_mad3(int a, int b, int c, int add)
{
if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
return stbi__malloc(a*b*c + add);
}
static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
{
if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
return stbi__malloc(a*b*c*d + add);
}
// stbi__err - error
// stbi__errpf - error returning pointer to float
// stbi__errpuc - error returning pointer to unsigned char
#ifdef STBI_NO_FAILURE_STRINGS
#define stbi__err(x,y) 0
#elif defined(STBI_FAILURE_USERMSG)
#define stbi__err(x,y) stbi__err(y)
#else
#define stbi__err(x,y) stbi__err(x)
#endif
#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
STBIDEF void stbi_image_free(void *retval_from_stbi_load)
{
STBI_FREE(retval_from_stbi_load);
}
#ifndef STBI_NO_LINEAR
static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
#endif
#ifndef STBI_NO_HDR
static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
#endif
static int stbi__vertically_flip_on_load = 0;
STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
{
stbi__vertically_flip_on_load = flag_true_if_should_flip;
}
static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
{
memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields
ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
ri->num_channels = 0;
#ifndef STBI_NO_JPEG
if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_PNG
if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_BMP
if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_GIF
if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_PSD
if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc);
#endif
#ifndef STBI_NO_PIC
if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_PNM
if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_HDR
if (stbi__hdr_test(s)) {
float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri);
return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
}
#endif
#ifndef STBI_NO_TGA
// test tga last because it's a crappy test!
if (stbi__tga_test(s))
return stbi__tga_load(s,x,y,comp,req_comp, ri);
#endif
return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
}
static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels)
{
int i;
int img_len = w * h * channels;
stbi_uc *reduced;
reduced = (stbi_uc *) stbi__malloc(img_len);
if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
for (i = 0; i < img_len; ++i)
reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling
STBI_FREE(orig);
return reduced;
}
static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels)
{
int i;
int img_len = w * h * channels;
stbi__uint16 *enlarged;
enlarged = (stbi__uint16 *) stbi__malloc(img_len*2);
if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
for (i = 0; i < img_len; ++i)
enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
STBI_FREE(orig);
return enlarged;
}
static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
{
stbi__result_info ri;
void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
if (result == NULL)
return NULL;
if (ri.bits_per_channel != 8) {
STBI_ASSERT(ri.bits_per_channel == 16);
result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
ri.bits_per_channel = 8;
}
// @TODO: move stbi__convert_format to here
if (stbi__vertically_flip_on_load) {
int w = *x, h = *y;
int channels = req_comp ? req_comp : *comp;
int row,col,z;
stbi_uc *image = (stbi_uc *) result;
// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
for (row = 0; row < (h>>1); row++) {
for (col = 0; col < w; col++) {
for (z = 0; z < channels; z++) {
stbi_uc temp = image[(row * w + col) * channels + z];
image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z];
image[((h - row - 1) * w + col) * channels + z] = temp;
}
}
}
}
return (unsigned char *) result;
}
static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
{
stbi__result_info ri;
void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
if (result == NULL)
return NULL;
if (ri.bits_per_channel != 16) {
STBI_ASSERT(ri.bits_per_channel == 8);
result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
ri.bits_per_channel = 16;
}
// @TODO: move stbi__convert_format16 to here
// @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision
if (stbi__vertically_flip_on_load) {
int w = *x, h = *y;
int channels = req_comp ? req_comp : *comp;
int row,col,z;
stbi__uint16 *image = (stbi__uint16 *) result;
// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
for (row = 0; row < (h>>1); row++) {
for (col = 0; col < w; col++) {
for (z = 0; z < channels; z++) {
stbi__uint16 temp = image[(row * w + col) * channels + z];
image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z];
image[((h - row - 1) * w + col) * channels + z] = temp;
}
}
}
}
return (stbi__uint16 *) result;
}
#ifndef STBI_NO_HDR
static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
{
if (stbi__vertically_flip_on_load && result != NULL) {
int w = *x, h = *y;
int depth = req_comp ? req_comp : *comp;
int row,col,z;
float temp;
// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
for (row = 0; row < (h>>1); row++) {
for (col = 0; col < w; col++) {
for (z = 0; z < depth; z++) {
temp = result[(row * w + col) * depth + z];
result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
result[((h - row - 1) * w + col) * depth + z] = temp;
}
}
}
}
}
#endif
#ifndef STBI_NO_STDIO
static FILE *stbi__fopen(char const *filename, char const *mode)
{
FILE *f;
#if defined(_MSC_VER) && _MSC_VER >= 1400
if (0 != fopen_s(&f, filename, mode))
f=0;
#else
f = fopen(filename, mode);
#endif
return f;
}
STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
{
FILE *f = stbi__fopen(filename, "rb");
unsigned char *result;
if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
result = stbi_load_from_file(f,x,y,comp,req_comp);
fclose(f);
return result;
}
STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
unsigned char *result;
stbi__context s;
stbi__start_file(&s,f);
result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
if (result) {
// need to 'unget' all the characters in the IO buffer
fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
}
return result;
}
STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp)
{
stbi__uint16 *result;
stbi__context s;
stbi__start_file(&s,f);
result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp);
if (result) {
// need to 'unget' all the characters in the IO buffer
fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
}
return result;
}
STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp)
{
FILE *f = stbi__fopen(filename, "rb");
stbi__uint16 *result;
if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file");
result = stbi_load_from_file_16(f,x,y,comp,req_comp);
fclose(f);
return result;
}
#endif //!STBI_NO_STDIO
STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
stbi__context s;
stbi__start_mem(&s,buffer,len);
return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
}
STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
{
stbi__context s;
stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
}
#ifndef STBI_NO_LINEAR
static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
{
unsigned char *data;
#ifndef STBI_NO_HDR
if (stbi__hdr_test(s)) {
stbi__result_info ri;
float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri);
if (hdr_data)
stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
return hdr_data;
}
#endif
data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
if (data)
return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
}
STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
{
stbi__context s;
stbi__start_mem(&s,buffer,len);
return stbi__loadf_main(&s,x,y,comp,req_comp);
}
STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
{
stbi__context s;
stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
return stbi__loadf_main(&s,x,y,comp,req_comp);
}
#ifndef STBI_NO_STDIO
STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
{
float *result;
FILE *f = stbi__fopen(filename, "rb");
if (!f) return stbi__errpf("can't fopen", "Unable to open file");
result = stbi_loadf_from_file(f,x,y,comp,req_comp);
fclose(f);
return result;
}
STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
{
stbi__context s;
stbi__start_file(&s,f);
return stbi__loadf_main(&s,x,y,comp,req_comp);
}
#endif // !STBI_NO_STDIO
#endif // !STBI_NO_LINEAR
// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
// reports false!
STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
{
#ifndef STBI_NO_HDR
stbi__context s;
stbi__start_mem(&s,buffer,len);
return stbi__hdr_test(&s);
#else
STBI_NOTUSED(buffer);
STBI_NOTUSED(len);
return 0;
#endif
}
#ifndef STBI_NO_STDIO
STBIDEF int stbi_is_hdr (char const *filename)
{
FILE *f = stbi__fopen(filename, "rb");
int result=0;
if (f) {
result = stbi_is_hdr_from_file(f);
fclose(f);
}
return result;
}
STBIDEF int stbi_is_hdr_from_file(FILE *f)
{
#ifndef STBI_NO_HDR
stbi__context s;
stbi__start_file(&s,f);
return stbi__hdr_test(&s);
#else
STBI_NOTUSED(f);
return 0;
#endif
}
#endif // !STBI_NO_STDIO
STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
{
#ifndef STBI_NO_HDR
stbi__context s;
stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
return stbi__hdr_test(&s);
#else
STBI_NOTUSED(clbk);
STBI_NOTUSED(user);
return 0;
#endif
}
#ifndef STBI_NO_LINEAR
static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
#endif
static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
//////////////////////////////////////////////////////////////////////////////
//
// Common code used by all image loaders
//
enum
{
STBI__SCAN_load=0,
STBI__SCAN_type,
STBI__SCAN_header
};
static void stbi__refill_buffer(stbi__context *s)
{
int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
if (n == 0) {
// at end of file, treat same as if from memory, but need to handle case
// where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
s->read_from_callbacks = 0;
s->img_buffer = s->buffer_start;
s->img_buffer_end = s->buffer_start+1;
*s->img_buffer = 0;
} else {
s->img_buffer = s->buffer_start;
s->img_buffer_end = s->buffer_start + n;
}
}
stbi_inline static stbi_uc stbi__get8(stbi__context *s)
{
if (s->img_buffer < s->img_buffer_end)
return *s->img_buffer++;
if (s->read_from_callbacks) {
stbi__refill_buffer(s);
return *s->img_buffer++;
}
return 0;
}
stbi_inline static int stbi__at_eof(stbi__context *s)
{
if (s->io.read) {
if (!(s->io.eof)(s->io_user_data)) return 0;
// if feof() is true, check if buffer = end
// special case: we've only got the special 0 character at the end
if (s->read_from_callbacks == 0) return 1;
}
return s->img_buffer >= s->img_buffer_end;
}
static void stbi__skip(stbi__context *s, int n)
{
if (n < 0) {
s->img_buffer = s->img_buffer_end;
return;
}
if (s->io.read) {
int blen = (int) (s->img_buffer_end - s->img_buffer);
if (blen < n) {
s->img_buffer = s->img_buffer_end;
(s->io.skip)(s->io_user_data, n - blen);
return;
}
}
s->img_buffer += n;
}
static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
{
if (s->io.read) {
int blen = (int) (s->img_buffer_end - s->img_buffer);
if (blen < n) {
int res, count;
memcpy(buffer, s->img_buffer, blen);
count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
res = (count == (n-blen));
s->img_buffer = s->img_buffer_end;
return res;
}
}
if (s->img_buffer+n <= s->img_buffer_end) {
memcpy(buffer, s->img_buffer, n);
s->img_buffer += n;
return 1;
} else
return 0;
}
static int stbi__get16be(stbi__context *s)
{
int z = stbi__get8(s);
return (z << 8) + stbi__get8(s);
}
static stbi__uint32 stbi__get32be(stbi__context *s)
{
stbi__uint32 z = stbi__get16be(s);
return (z << 16) + stbi__get16be(s);
}
#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
// nothing
#else
static int stbi__get16le(stbi__context *s)
{
int z = stbi__get8(s);
return z + (stbi__get8(s) << 8);
}
#endif
#ifndef STBI_NO_BMP
static stbi__uint32 stbi__get32le(stbi__context *s)
{
stbi__uint32 z = stbi__get16le(s);
return z + (stbi__get16le(s) << 16);
}
#endif
#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings
//////////////////////////////////////////////////////////////////////////////
//
// generic converter from built-in img_n to req_comp
// individual types do this automatically as much as possible (e.g. jpeg
// does all cases internally since it needs to colorspace convert anyway,
// and it never has alpha, so very few cases ). png can automatically
// interleave an alpha=255 channel, but falls back to this for other cases
//
// assume data buffer is malloced, so malloc a new one and free that one
// only failure mode is malloc failing
static stbi_uc stbi__compute_y(int r, int g, int b)
{
return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8);
}
static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
{
int i,j;
unsigned char *good;
if (req_comp == img_n) return data;
STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0);
if (good == NULL) {
STBI_FREE(data);
return stbi__errpuc("outofmem", "Out of memory");
}
for (j=0; j < (int) y; ++j) {
unsigned char *src = data + j * x * img_n ;
unsigned char *dest = good + j * x * req_comp;
#define STBI__COMBO(a,b) ((a)*8+(b))
#define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
// convert source image with img_n components to one with req_comp components;
// avoid switch per pixel, so use switch per scanline and massive macros
switch (STBI__COMBO(img_n, req_comp)) {
STBI__CASE(1,2) { dest[0]=src[0], dest[1]=255; } break;
STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; } break;
STBI__CASE(2,1) { dest[0]=src[0]; } break;
STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break;
STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; } break;
STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; } break;
STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; } break;
STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break;
default: STBI_ASSERT(0);
}
#undef STBI__CASE
}
STBI_FREE(data);
return good;
}
static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
{
return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8);
}
static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y)
{
int i,j;
stbi__uint16 *good;
if (req_comp == img_n) return data;
STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2);
if (good == NULL) {
STBI_FREE(data);
return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
}
for (j=0; j < (int) y; ++j) {
stbi__uint16 *src = data + j * x * img_n ;
stbi__uint16 *dest = good + j * x * req_comp;
#define STBI__COMBO(a,b) ((a)*8+(b))
#define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
// convert source image with img_n components to one with req_comp components;
// avoid switch per pixel, so use switch per scanline and massive macros
switch (STBI__COMBO(img_n, req_comp)) {
STBI__CASE(1,2) { dest[0]=src[0], dest[1]=0xffff; } break;
STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=0xffff; } break;
STBI__CASE(2,1) { dest[0]=src[0]; } break;
STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break;
STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=0xffff; } break;
STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = 0xffff; } break;
STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = src[3]; } break;
STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break;
default: STBI_ASSERT(0);
}
#undef STBI__CASE
}
STBI_FREE(data);
return good;
}
#ifndef STBI_NO_LINEAR
static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
{
int i,k,n;
float *output;
if (!data) return NULL;
output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
// compute number of non-alpha components
if (comp & 1) n = comp; else n = comp-1;
for (i=0; i < x*y; ++i) {
for (k=0; k < n; ++k) {
output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
}
if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
}
STBI_FREE(data);
return output;
}
#endif
#ifndef STBI_NO_HDR
#define stbi__float2int(x) ((int) (x))
static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
{
int i,k,n;
stbi_uc *output;
if (!data) return NULL;
output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0);
if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
// compute number of non-alpha components
if (comp & 1) n = comp; else n = comp-1;
for (i=0; i < x*y; ++i) {
for (k=0; k < n; ++k) {
float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
if (z < 0) z = 0;
if (z > 255) z = 255;
output[i*comp + k] = (stbi_uc) stbi__float2int(z);
}
if (k < comp) {
float z = data[i*comp+k] * 255 + 0.5f;
if (z < 0) z = 0;
if (z > 255) z = 255;
output[i*comp + k] = (stbi_uc) stbi__float2int(z);
}
}
STBI_FREE(data);
return output;
}
#endif
//////////////////////////////////////////////////////////////////////////////
//
// "baseline" JPEG/JFIF decoder
//
// simple implementation
// - doesn't support delayed output of y-dimension
// - simple interface (only one output format: 8-bit interleaved RGB)
// - doesn't try to recover corrupt jpegs
// - doesn't allow partial loading, loading multiple at once
// - still fast on x86 (copying globals into locals doesn't help x86)
// - allocates lots of intermediate memory (full size of all components)
// - non-interleaved case requires this anyway
// - allows good upsampling (see next)
// high-quality
// - upsampled channels are bilinearly interpolated, even across blocks
// - quality integer IDCT derived from IJG's 'slow'
// performance
// - fast huffman; reasonable integer IDCT
// - some SIMD kernels for common paths on targets with SSE2/NEON
// - uses a lot of intermediate memory, could cache poorly
#ifndef STBI_NO_JPEG
// huffman decoding acceleration
#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
typedef struct
{
stbi_uc fast[1 << FAST_BITS];
// weirdly, repacking this into AoS is a 10% speed loss, instead of a win
stbi__uint16 code[256];
stbi_uc values[256];
stbi_uc size[257];
unsigned int maxcode[18];
int delta[17]; // old 'firstsymbol' - old 'firstcode'
} stbi__huffman;
typedef struct
{
stbi__context *s;
stbi__huffman huff_dc[4];
stbi__huffman huff_ac[4];
stbi__uint16 dequant[4][64];
stbi__int16 fast_ac[4][1 << FAST_BITS];
// sizes for components, interleaved MCUs
int img_h_max, img_v_max;
int img_mcu_x, img_mcu_y;
int img_mcu_w, img_mcu_h;
// definition of jpeg image component
struct
{
int id;
int h,v;
int tq;
int hd,ha;
int dc_pred;
int x,y,w2,h2;
stbi_uc *data;
void *raw_data, *raw_coeff;
stbi_uc *linebuf;
short *coeff; // progressive only
int coeff_w, coeff_h; // number of 8x8 coefficient blocks
} img_comp[4];
stbi__uint32 code_buffer; // jpeg entropy-coded buffer
int code_bits; // number of valid bits
unsigned char marker; // marker seen while filling entropy buffer
int nomore; // flag if we saw a marker so must stop
int progressive;
int spec_start;
int spec_end;
int succ_high;
int succ_low;
int eob_run;
int jfif;
int app14_color_transform; // Adobe APP14 tag
int rgb;
int scan_n, order[4];
int restart_interval, todo;
// kernels
void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
} stbi__jpeg;
static int stbi__build_huffman(stbi__huffman *h, int *count)
{
int i,j,k=0,code;
// build size list for each symbol (from JPEG spec)
for (i=0; i < 16; ++i)
for (j=0; j < count[i]; ++j)
h->size[k++] = (stbi_uc) (i+1);
h->size[k] = 0;
// compute actual symbols (from jpeg spec)
code = 0;
k = 0;
for(j=1; j <= 16; ++j) {
// compute delta to add to code to compute symbol id
h->delta[j] = k - code;
if (h->size[k] == j) {
while (h->size[k] == j)
h->code[k++] = (stbi__uint16) (code++);
if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG");
}
// compute largest code + 1 for this size, preshifted as needed later
h->maxcode[j] = code << (16-j);
code <<= 1;
}
h->maxcode[j] = 0xffffffff;
// build non-spec acceleration table; 255 is flag for not-accelerated
memset(h->fast, 255, 1 << FAST_BITS);
for (i=0; i < k; ++i) {
int s = h->size[i];
if (s <= FAST_BITS) {
int c = h->code[i] << (FAST_BITS-s);
int m = 1 << (FAST_BITS-s);
for (j=0; j < m; ++j) {
h->fast[c+j] = (stbi_uc) i;
}
}
}
return 1;
}
// build a table that decodes both magnitude and value of small ACs in
// one go.
static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
{
int i;
for (i=0; i < (1 << FAST_BITS); ++i) {
stbi_uc fast = h->fast[i];
fast_ac[i] = 0;
if (fast < 255) {
int rs = h->values[fast];
int run = (rs >> 4) & 15;
int magbits = rs & 15;
int len = h->size[fast];
if (magbits && len + magbits <= FAST_BITS) {
// magnitude code followed by receive_extend code
int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
int m = 1 << (magbits - 1);
if (k < m) k += (~0U << magbits) + 1;
// if the result is small enough, we can fit it in fast_ac table
if (k >= -128 && k <= 127)
fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits));
}
}
}
}
static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
{
do {
int b = j->nomore ? 0 : stbi__get8(j->s);
if (b == 0xff) {
int c = stbi__get8(j->s);
while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
if (c != 0) {
j->marker = (unsigned char) c;
j->nomore = 1;
return;
}
}
j->code_buffer |= b << (24 - j->code_bits);
j->code_bits += 8;
} while (j->code_bits <= 24);
}
// (1 << n) - 1
static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
// decode a jpeg huffman value from the bitstream
stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
{
unsigned int temp;
int c,k;
if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
// look at the top FAST_BITS and determine what symbol ID it is,
// if the code is <= FAST_BITS
c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
k = h->fast[c];
if (k < 255) {
int s = h->size[k];
if (s > j->code_bits)
return -1;
j->code_buffer <<= s;
j->code_bits -= s;
return h->values[k];
}
// naive test is to shift the code_buffer down so k bits are
// valid, then test against maxcode. To speed this up, we've
// preshifted maxcode left so that it has (16-k) 0s at the
// end; in other words, regardless of the number of bits, it
// wants to be compared against something shifted to have 16;
// that way we don't need to shift inside the loop.
temp = j->code_buffer >> 16;
for (k=FAST_BITS+1 ; ; ++k)
if (temp < h->maxcode[k])
break;
if (k == 17) {
// error! code not found
j->code_bits -= 16;
return -1;
}
if (k > j->code_bits)
return -1;
// convert the huffman code to the symbol id
c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
// convert the id to a symbol
j->code_bits -= k;
j->code_buffer <<= k;
return h->values[c];
}
// bias[n] = (-1<<n) + 1
static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
// combined JPEG 'receive' and JPEG 'extend', since baseline
// always extends everything it receives.
stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
{
unsigned int k;
int sgn;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
k = stbi_lrot(j->code_buffer, n);
STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
j->code_buffer = k & ~stbi__bmask[n];
k &= stbi__bmask[n];
j->code_bits -= n;
return k + (stbi__jbias[n] & ~sgn);
}
// get some unsigned bits
stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
{
unsigned int k;
if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
k = stbi_lrot(j->code_buffer, n);
j->code_buffer = k & ~stbi__bmask[n];
k &= stbi__bmask[n];
j->code_bits -= n;
return k;
}
stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
{
unsigned int k;
if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
k = j->code_buffer;
j->code_buffer <<= 1;
--j->code_bits;
return k & 0x80000000;
}
// given a value that's at position X in the zigzag stream,
// where does it appear in the 8x8 matrix coded as row-major?
static stbi_uc stbi__jpeg_dezigzag[64+15] =
{
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,
// let corrupt input sample past end
63, 63, 63, 63, 63, 63, 63, 63,
63, 63, 63, 63, 63, 63, 63
};
// decode one 64-entry block--
static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
{
int diff,dc,k;
int t;
if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
t = stbi__jpeg_huff_decode(j, hdc);
if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
// 0 all the ac values now so we can do it 32-bits at a time
memset(data,0,64*sizeof(data[0]));
diff = t ? stbi__extend_receive(j, t) : 0;
dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc;
data[0] = (short) (dc * dequant[0]);
// decode AC components, see JPEG spec
k = 1;
do {
unsigned int zig;
int c,r,s;
if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
r = fac[c];
if (r) { // fast-AC path
k += (r >> 4) & 15; // run
s = r & 15; // combined length
j->code_buffer <<= s;
j->code_bits -= s;
// decode into unzigzag'd location
zig = stbi__jpeg_dezigzag[k++];
data[zig] = (short) ((r >> 8) * dequant[zig]);
} else {
int rs = stbi__jpeg_huff_decode(j, hac);
if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
s = rs & 15;
r = rs >> 4;
if (s == 0) {
if (rs != 0xf0) break; // end block
k += 16;
} else {
k += r;
// decode into unzigzag'd location
zig = stbi__jpeg_dezigzag[k++];
data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
}
}
} while (k < 64);
return 1;
}
static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
{
int diff,dc;
int t;
if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
if (j->succ_high == 0) {
// first scan for DC coefficient, must be first
memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
t = stbi__jpeg_huff_decode(j, hdc);
diff = t ? stbi__extend_receive(j, t) : 0;
dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc;
data[0] = (short) (dc << j->succ_low);
} else {
// refinement scan for DC coefficient
if (stbi__jpeg_get_bit(j))
data[0] += (short) (1 << j->succ_low);
}
return 1;
}
// @OPTIMIZE: store non-zigzagged during the decode passes,
// and only de-zigzag when dequantizing
static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
{
int k;
if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
if (j->succ_high == 0) {
int shift = j->succ_low;
if (j->eob_run) {
--j->eob_run;
return 1;
}
k = j->spec_start;
do {
unsigned int zig;
int c,r,s;
if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
r = fac[c];
if (r) { // fast-AC path
k += (r >> 4) & 15; // run
s = r & 15; // combined length
j->code_buffer <<= s;
j->code_bits -= s;
zig = stbi__jpeg_dezigzag[k++];
data[zig] = (short) ((r >> 8) << shift);
} else {
int rs = stbi__jpeg_huff_decode(j, hac);
if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
s = rs & 15;
r = rs >> 4;
if (s == 0) {
if (r < 15) {
j->eob_run = (1 << r);
if (r)
j->eob_run += stbi__jpeg_get_bits(j, r);
--j->eob_run;
break;
}
k += 16;
} else {
k += r;
zig = stbi__jpeg_dezigzag[k++];
data[zig] = (short) (stbi__extend_receive(j,s) << shift);
}
}
} while (k <= j->spec_end);
} else {
// refinement scan for these AC coefficients
short bit = (short) (1 << j->succ_low);
if (j->eob_run) {
--j->eob_run;
for (k = j->spec_start; k <= j->spec_end; ++k) {
short *p = &data[stbi__jpeg_dezigzag[k]];
if (*p != 0)
if (stbi__jpeg_get_bit(j))
if ((*p & bit)==0) {
if (*p > 0)
*p += bit;
else
*p -= bit;
}
}
} else {
k = j->spec_start;
do {
int r,s;
int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
s = rs & 15;
r = rs >> 4;
if (s == 0) {
if (r < 15) {
j->eob_run = (1 << r) - 1;
if (r)
j->eob_run += stbi__jpeg_get_bits(j, r);
r = 64; // force end of block
} else {
// r=15 s=0 should write 16 0s, so we just do
// a run of 15 0s and then write s (which is 0),
// so we don't have to do anything special here
}
} else {
if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
// sign bit
if (stbi__jpeg_get_bit(j))
s = bit;
else
s = -bit;
}
// advance by r
while (k <= j->spec_end) {
short *p = &data[stbi__jpeg_dezigzag[k++]];
if (*p != 0) {
if (stbi__jpeg_get_bit(j))
if ((*p & bit)==0) {
if (*p > 0)
*p += bit;
else
*p -= bit;
}
} else {
if (r == 0) {
*p = (short) s;
break;
}
--r;
}
}
} while (k <= j->spec_end);
}
}
return 1;
}
// take a -128..127 value and stbi__clamp it and convert to 0..255
stbi_inline static stbi_uc stbi__clamp(int x)
{
// trick to use a single test to catch both cases
if ((unsigned int) x > 255) {
if (x < 0) return 0;
if (x > 255) return 255;
}
return (stbi_uc) x;
}
#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5)))
#define stbi__fsh(x) ((x) << 12)
// derived from jidctint -- DCT_ISLOW
#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
p2 = s2; \
p3 = s6; \
p1 = (p2+p3) * stbi__f2f(0.5411961f); \
t2 = p1 + p3*stbi__f2f(-1.847759065f); \
t3 = p1 + p2*stbi__f2f( 0.765366865f); \
p2 = s0; \
p3 = s4; \
t0 = stbi__fsh(p2+p3); \
t1 = stbi__fsh(p2-p3); \
x0 = t0+t3; \
x3 = t0-t3; \
x1 = t1+t2; \
x2 = t1-t2; \
t0 = s7; \
t1 = s5; \
t2 = s3; \
t3 = s1; \
p3 = t0+t2; \
p4 = t1+t3; \
p1 = t0+t3; \
p2 = t1+t2; \
p5 = (p3+p4)*stbi__f2f( 1.175875602f); \
t0 = t0*stbi__f2f( 0.298631336f); \
t1 = t1*stbi__f2f( 2.053119869f); \
t2 = t2*stbi__f2f( 3.072711026f); \
t3 = t3*stbi__f2f( 1.501321110f); \
p1 = p5 + p1*stbi__f2f(-0.899976223f); \
p2 = p5 + p2*stbi__f2f(-2.562915447f); \
p3 = p3*stbi__f2f(-1.961570560f); \
p4 = p4*stbi__f2f(-0.390180644f); \
t3 += p1+p4; \
t2 += p2+p3; \
t1 += p2+p4; \
t0 += p1+p3;
static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
{
int i,val[64],*v=val;
stbi_uc *o;
short *d = data;
// columns
for (i=0; i < 8; ++i,++d, ++v) {
// if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
&& d[40]==0 && d[48]==0 && d[56]==0) {
// no shortcut 0 seconds
// (1|2|3|4|5|6|7)==0 0 seconds
// all separate -0.047 seconds
// 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
int dcterm = d[0] << 2;
v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
} else {
STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
// constants scaled things up by 1<<12; let's bring them back
// down, but keep 2 extra bits of precision
x0 += 512; x1 += 512; x2 += 512; x3 += 512;
v[ 0] = (x0+t3) >> 10;
v[56] = (x0-t3) >> 10;
v[ 8] = (x1+t2) >> 10;
v[48] = (x1-t2) >> 10;
v[16] = (x2+t1) >> 10;
v[40] = (x2-t1) >> 10;
v[24] = (x3+t0) >> 10;
v[32] = (x3-t0) >> 10;
}
}
for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
// no fast case since the first 1D IDCT spread components out
STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
// constants scaled things up by 1<<12, plus we had 1<<2 from first
// loop, plus horizontal and vertical each scale by sqrt(8) so together
// we've got an extra 1<<3, so 1<<17 total we need to remove.
// so we want to round that, which means adding 0.5 * 1<<17,
// aka 65536. Also, we'll end up with -128 to 127 that we want
// to encode as 0..255 by adding 128, so we'll add that before the shift
x0 += 65536 + (128<<17);
x1 += 65536 + (128<<17);
x2 += 65536 + (128<<17);
x3 += 65536 + (128<<17);
// tried computing the shifts into temps, or'ing the temps to see
// if any were out of range, but that was slower
o[0] = stbi__clamp((x0+t3) >> 17);
o[7] = stbi__clamp((x0-t3) >> 17);
o[1] = stbi__clamp((x1+t2) >> 17);
o[6] = stbi__clamp((x1-t2) >> 17);
o[2] = stbi__clamp((x2+t1) >> 17);
o[5] = stbi__clamp((x2-t1) >> 17);
o[3] = stbi__clamp((x3+t0) >> 17);
o[4] = stbi__clamp((x3-t0) >> 17);
}
}
#ifdef STBI_SSE2
// sse2 integer IDCT. not the fastest possible implementation but it
// produces bit-identical results to the generic C version so it's
// fully "transparent".
static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
{
// This is constructed to match our regular (generic) integer IDCT exactly.
__m128i row0, row1, row2, row3, row4, row5, row6, row7;
__m128i tmp;
// dot product constant: even elems=x, odd elems=y
#define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
// out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
// out(1) = c1[even]*x + c1[odd]*y
#define dct_rot(out0,out1, x,y,c0,c1) \
__m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
__m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
__m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
__m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
__m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
__m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
// out = in << 12 (in 16-bit, out 32-bit)
#define dct_widen(out, in) \
__m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
__m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
// wide add
#define dct_wadd(out, a, b) \
__m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
__m128i out##_h = _mm_add_epi32(a##_h, b##_h)
// wide sub
#define dct_wsub(out, a, b) \
__m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
__m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
// butterfly a/b, add bias, then shift by "s" and pack
#define dct_bfly32o(out0, out1, a,b,bias,s) \
{ \
__m128i abiased_l = _mm_add_epi32(a##_l, bias); \
__m128i abiased_h = _mm_add_epi32(a##_h, bias); \
dct_wadd(sum, abiased, b); \
dct_wsub(dif, abiased, b); \
out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
}
// 8-bit interleave step (for transposes)
#define dct_interleave8(a, b) \
tmp = a; \
a = _mm_unpacklo_epi8(a, b); \
b = _mm_unpackhi_epi8(tmp, b)
// 16-bit interleave step (for transposes)
#define dct_interleave16(a, b) \
tmp = a; \
a = _mm_unpacklo_epi16(a, b); \
b = _mm_unpackhi_epi16(tmp, b)
#define dct_pass(bias,shift) \
{ \
/* even part */ \
dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
__m128i sum04 = _mm_add_epi16(row0, row4); \
__m128i dif04 = _mm_sub_epi16(row0, row4); \
dct_widen(t0e, sum04); \
dct_widen(t1e, dif04); \
dct_wadd(x0, t0e, t3e); \
dct_wsub(x3, t0e, t3e); \
dct_wadd(x1, t1e, t2e); \
dct_wsub(x2, t1e, t2e); \
/* odd part */ \
dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
__m128i sum17 = _mm_add_epi16(row1, row7); \
__m128i sum35 = _mm_add_epi16(row3, row5); \
dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
dct_wadd(x4, y0o, y4o); \
dct_wadd(x5, y1o, y5o); \
dct_wadd(x6, y2o, y5o); \
dct_wadd(x7, y3o, y4o); \
dct_bfly32o(row0,row7, x0,x7,bias,shift); \
dct_bfly32o(row1,row6, x1,x6,bias,shift); \
dct_bfly32o(row2,row5, x2,x5,bias,shift); \
dct_bfly32o(row3,row4, x3,x4,bias,shift); \
}
__m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
__m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
__m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
__m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
__m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
__m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
__m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
__m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
// rounding biases in column/row passes, see stbi__idct_block for explanation.
__m128i bias_0 = _mm_set1_epi32(512);
__m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
// load
row0 = _mm_load_si128((const __m128i *) (data + 0*8));
row1 = _mm_load_si128((const __m128i *) (data + 1*8));
row2 = _mm_load_si128((const __m128i *) (data + 2*8));
row3 = _mm_load_si128((const __m128i *) (data + 3*8));
row4 = _mm_load_si128((const __m128i *) (data + 4*8));
row5 = _mm_load_si128((const __m128i *) (data + 5*8));
row6 = _mm_load_si128((const __m128i *) (data + 6*8));
row7 = _mm_load_si128((const __m128i *) (data + 7*8));
// column pass
dct_pass(bias_0, 10);
{
// 16bit 8x8 transpose pass 1
dct_interleave16(row0, row4);
dct_interleave16(row1, row5);
dct_interleave16(row2, row6);
dct_interleave16(row3, row7);
// transpose pass 2
dct_interleave16(row0, row2);
dct_interleave16(row1, row3);
dct_interleave16(row4, row6);
dct_interleave16(row5, row7);
// transpose pass 3
dct_interleave16(row0, row1);
dct_interleave16(row2, row3);
dct_interleave16(row4, row5);
dct_interleave16(row6, row7);
}
// row pass
dct_pass(bias_1, 17);
{
// pack
__m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
__m128i p1 = _mm_packus_epi16(row2, row3);
__m128i p2 = _mm_packus_epi16(row4, row5);
__m128i p3 = _mm_packus_epi16(row6, row7);
// 8bit 8x8 transpose pass 1
dct_interleave8(p0, p2); // a0e0a1e1...
dct_interleave8(p1, p3); // c0g0c1g1...
// transpose pass 2
dct_interleave8(p0, p1); // a0c0e0g0...
dct_interleave8(p2, p3); // b0d0f0h0...
// transpose pass 3
dct_interleave8(p0, p2); // a0b0c0d0...
dct_interleave8(p1, p3); // a4b4c4d4...
// store
_mm_storel_epi64((__m128i *) out, p0); out += out_stride;
_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
_mm_storel_epi64((__m128i *) out, p2); out += out_stride;
_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
_mm_storel_epi64((__m128i *) out, p1); out += out_stride;
_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
_mm_storel_epi64((__m128i *) out, p3); out += out_stride;
_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
}
#undef dct_const
#undef dct_rot
#undef dct_widen
#undef dct_wadd
#undef dct_wsub
#undef dct_bfly32o
#undef dct_interleave8
#undef dct_interleave16
#undef dct_pass
}
#endif // STBI_SSE2
#ifdef STBI_NEON
// NEON integer IDCT. should produce bit-identical
// results to the generic C version.
static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
{
int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
#define dct_long_mul(out, inq, coeff) \
int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
#define dct_long_mac(out, acc, inq, coeff) \
int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
#define dct_widen(out, inq) \
int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
// wide add
#define dct_wadd(out, a, b) \
int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
// wide sub
#define dct_wsub(out, a, b) \
int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
// butterfly a/b, then shift using "shiftop" by "s" and pack
#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
{ \
dct_wadd(sum, a, b); \
dct_wsub(dif, a, b); \
out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
}
#define dct_pass(shiftop, shift) \
{ \
/* even part */ \
int16x8_t sum26 = vaddq_s16(row2, row6); \
dct_long_mul(p1e, sum26, rot0_0); \
dct_long_mac(t2e, p1e, row6, rot0_1); \
dct_long_mac(t3e, p1e, row2, rot0_2); \
int16x8_t sum04 = vaddq_s16(row0, row4); \
int16x8_t dif04 = vsubq_s16(row0, row4); \
dct_widen(t0e, sum04); \
dct_widen(t1e, dif04); \
dct_wadd(x0, t0e, t3e); \
dct_wsub(x3, t0e, t3e); \
dct_wadd(x1, t1e, t2e); \
dct_wsub(x2, t1e, t2e); \
/* odd part */ \
int16x8_t sum15 = vaddq_s16(row1, row5); \
int16x8_t sum17 = vaddq_s16(row1, row7); \
int16x8_t sum35 = vaddq_s16(row3, row5); \
int16x8_t sum37 = vaddq_s16(row3, row7); \
int16x8_t sumodd = vaddq_s16(sum17, sum35); \
dct_long_mul(p5o, sumodd, rot1_0); \
dct_long_mac(p1o, p5o, sum17, rot1_1); \
dct_long_mac(p2o, p5o, sum35, rot1_2); \
dct_long_mul(p3o, sum37, rot2_0); \
dct_long_mul(p4o, sum15, rot2_1); \
dct_wadd(sump13o, p1o, p3o); \
dct_wadd(sump24o, p2o, p4o); \
dct_wadd(sump23o, p2o, p3o); \
dct_wadd(sump14o, p1o, p4o); \
dct_long_mac(x4, sump13o, row7, rot3_0); \
dct_long_mac(x5, sump24o, row5, rot3_1); \
dct_long_mac(x6, sump23o, row3, rot3_2); \
dct_long_mac(x7, sump14o, row1, rot3_3); \
dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
}
// load
row0 = vld1q_s16(data + 0*8);
row1 = vld1q_s16(data + 1*8);
row2 = vld1q_s16(data + 2*8);
row3 = vld1q_s16(data + 3*8);
row4 = vld1q_s16(data + 4*8);
row5 = vld1q_s16(data + 5*8);
row6 = vld1q_s16(data + 6*8);
row7 = vld1q_s16(data + 7*8);
// add DC bias
row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
// column pass
dct_pass(vrshrn_n_s32, 10);
// 16bit 8x8 transpose
{
// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
// whether compilers actually get this is another story, sadly.
#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
// pass 1
dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
dct_trn16(row2, row3);
dct_trn16(row4, row5);
dct_trn16(row6, row7);
// pass 2
dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
dct_trn32(row1, row3);
dct_trn32(row4, row6);
dct_trn32(row5, row7);
// pass 3
dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
dct_trn64(row1, row5);
dct_trn64(row2, row6);
dct_trn64(row3, row7);
#undef dct_trn16
#undef dct_trn32
#undef dct_trn64
}
// row pass
// vrshrn_n_s32 only supports shifts up to 16, we need
// 17. so do a non-rounding shift of 16 first then follow
// up with a rounding shift by 1.
dct_pass(vshrn_n_s32, 16);
{
// pack and round
uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
// again, these can translate into one instruction, but often don't.
#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
// sadly can't use interleaved stores here since we only write
// 8 bytes to each scan line!
// 8x8 8-bit transpose pass 1
dct_trn8_8(p0, p1);
dct_trn8_8(p2, p3);
dct_trn8_8(p4, p5);
dct_trn8_8(p6, p7);
// pass 2
dct_trn8_16(p0, p2);
dct_trn8_16(p1, p3);
dct_trn8_16(p4, p6);
dct_trn8_16(p5, p7);
// pass 3
dct_trn8_32(p0, p4);
dct_trn8_32(p1, p5);
dct_trn8_32(p2, p6);
dct_trn8_32(p3, p7);
// store
vst1_u8(out, p0); out += out_stride;
vst1_u8(out, p1); out += out_stride;
vst1_u8(out, p2); out += out_stride;
vst1_u8(out, p3); out += out_stride;
vst1_u8(out, p4); out += out_stride;
vst1_u8(out, p5); out += out_stride;
vst1_u8(out, p6); out += out_stride;
vst1_u8(out, p7);
#undef dct_trn8_8
#undef dct_trn8_16
#undef dct_trn8_32
}
#undef dct_long_mul
#undef dct_long_mac
#undef dct_widen
#undef dct_wadd
#undef dct_wsub
#undef dct_bfly32o
#undef dct_pass
}
#endif // STBI_NEON
#define STBI__MARKER_none 0xff
// if there's a pending marker from the entropy stream, return that
// otherwise, fetch from the stream and get a marker. if there's no
// marker, return 0xff, which is never a valid marker value
static stbi_uc stbi__get_marker(stbi__jpeg *j)
{
stbi_uc x;
if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
x = stbi__get8(j->s);
if (x != 0xff) return STBI__MARKER_none;
while (x == 0xff)
x = stbi__get8(j->s); // consume repeated 0xff fill bytes
return x;
}
// in each scan, we'll have scan_n components, and the order
// of the components is specified by order[]
#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
// after a restart interval, stbi__jpeg_reset the entropy decoder and
// the dc prediction
static void stbi__jpeg_reset(stbi__jpeg *j)
{
j->code_bits = 0;
j->code_buffer = 0;
j->nomore = 0;
j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
j->marker = STBI__MARKER_none;
j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
j->eob_run = 0;
// no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
// since we don't even allow 1<<30 pixels
}
static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
{
stbi__jpeg_reset(z);
if (!z->progressive) {
if (z->scan_n == 1) {
int i,j;
STBI_SIMD_ALIGN(short, data[64]);
int n = z->order[0];
// non-interleaved data, we just need to process one block at a time,
// in trivial scanline order
// number of blocks to do just depends on how many actual "pixels" this
// component has, independent of interleaved MCU blocking and such
int w = (z->img_comp[n].x+7) >> 3;
int h = (z->img_comp[n].y+7) >> 3;
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i) {
int ha = z->img_comp[n].ha;
if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
// every data block is an MCU, so countdown the restart interval
if (--z->todo <= 0) {
if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
// if it's NOT a restart, then just bail, so we get corrupt data
// rather than no data
if (!STBI__RESTART(z->marker)) return 1;
stbi__jpeg_reset(z);
}
}
}
return 1;
} else { // interleaved
int i,j,k,x,y;
STBI_SIMD_ALIGN(short, data[64]);
for (j=0; j < z->img_mcu_y; ++j) {
for (i=0; i < z->img_mcu_x; ++i) {
// scan an interleaved mcu... process scan_n components in order
for (k=0; k < z->scan_n; ++k) {
int n = z->order[k];
// scan out an mcu's worth of this component; that's just determined
// by the basic H and V specified for the component
for (y=0; y < z->img_comp[n].v; ++y) {
for (x=0; x < z->img_comp[n].h; ++x) {
int x2 = (i*z->img_comp[n].h + x)*8;
int y2 = (j*z->img_comp[n].v + y)*8;
int ha = z->img_comp[n].ha;
if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
}
}
}
// after all interleaved components, that's an interleaved MCU,
// so now count down the restart interval
if (--z->todo <= 0) {
if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
if (!STBI__RESTART(z->marker)) return 1;
stbi__jpeg_reset(z);
}
}
}
return 1;
}
} else {
if (z->scan_n == 1) {
int i,j;
int n = z->order[0];
// non-interleaved data, we just need to process one block at a time,
// in trivial scanline order
// number of blocks to do just depends on how many actual "pixels" this
// component has, independent of interleaved MCU blocking and such
int w = (z->img_comp[n].x+7) >> 3;
int h = (z->img_comp[n].y+7) >> 3;
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i) {
short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
if (z->spec_start == 0) {
if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
return 0;
} else {
int ha = z->img_comp[n].ha;
if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
return 0;
}
// every data block is an MCU, so countdown the restart interval
if (--z->todo <= 0) {
if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
if (!STBI__RESTART(z->marker)) return 1;
stbi__jpeg_reset(z);
}
}
}
return 1;
} else { // interleaved
int i,j,k,x,y;
for (j=0; j < z->img_mcu_y; ++j) {
for (i=0; i < z->img_mcu_x; ++i) {
// scan an interleaved mcu... process scan_n components in order
for (k=0; k < z->scan_n; ++k) {
int n = z->order[k];
// scan out an mcu's worth of this component; that's just determined
// by the basic H and V specified for the component
for (y=0; y < z->img_comp[n].v; ++y) {
for (x=0; x < z->img_comp[n].h; ++x) {
int x2 = (i*z->img_comp[n].h + x);
int y2 = (j*z->img_comp[n].v + y);
short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
return 0;
}
}
}
// after all interleaved components, that's an interleaved MCU,
// so now count down the restart interval
if (--z->todo <= 0) {
if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
if (!STBI__RESTART(z->marker)) return 1;
stbi__jpeg_reset(z);
}
}
}
return 1;
}
}
}
static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
{
int i;
for (i=0; i < 64; ++i)
data[i] *= dequant[i];
}
static void stbi__jpeg_finish(stbi__jpeg *z)
{
if (z->progressive) {
// dequantize and idct the data
int i,j,n;
for (n=0; n < z->s->img_n; ++n) {
int w = (z->img_comp[n].x+7) >> 3;
int h = (z->img_comp[n].y+7) >> 3;
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i) {
short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
}
}
}
}
}
static int stbi__process_marker(stbi__jpeg *z, int m)
{
int L;
switch (m) {
case STBI__MARKER_none: // no marker found
return stbi__err("expected marker","Corrupt JPEG");
case 0xDD: // DRI - specify restart interval
if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
z->restart_interval = stbi__get16be(z->s);
return 1;
case 0xDB: // DQT - define quantization table
L = stbi__get16be(z->s)-2;
while (L > 0) {
int q = stbi__get8(z->s);
int p = q >> 4, sixteen = (p != 0);
int t = q & 15,i;
if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
for (i=0; i < 64; ++i)
z->dequant[t][stbi__jpeg_dezigzag[i]] = sixteen ? stbi__get16be(z->s) : stbi__get8(z->s);
L -= (sixteen ? 129 : 65);
}
return L==0;
case 0xC4: // DHT - define huffman table
L = stbi__get16be(z->s)-2;
while (L > 0) {
stbi_uc *v;
int sizes[16],i,n=0;
int q = stbi__get8(z->s);
int tc = q >> 4;
int th = q & 15;
if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
for (i=0; i < 16; ++i) {
sizes[i] = stbi__get8(z->s);
n += sizes[i];
}
L -= 17;
if (tc == 0) {
if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
v = z->huff_dc[th].values;
} else {
if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
v = z->huff_ac[th].values;
}
for (i=0; i < n; ++i)
v[i] = stbi__get8(z->s);
if (tc != 0)
stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
L -= n;
}
return L==0;
}
// check for comment block or APP blocks
if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
L = stbi__get16be(z->s);
if (L < 2) {
if (m == 0xFE)
return stbi__err("bad COM len","Corrupt JPEG");
else
return stbi__err("bad APP len","Corrupt JPEG");
}
L -= 2;
if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
static const unsigned char tag[5] = {'J','F','I','F','\0'};
int ok = 1;
int i;
for (i=0; i < 5; ++i)
if (stbi__get8(z->s) != tag[i])
ok = 0;
L -= 5;
if (ok)
z->jfif = 1;
} else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
static const unsigned char tag[6] = {'A','d','o','b','e','\0'};
int ok = 1;
int i;
for (i=0; i < 6; ++i)
if (stbi__get8(z->s) != tag[i])
ok = 0;
L -= 6;
if (ok) {
stbi__get8(z->s); // version
stbi__get16be(z->s); // flags0
stbi__get16be(z->s); // flags1
z->app14_color_transform = stbi__get8(z->s); // color transform
L -= 6;
}
}
stbi__skip(z->s, L);
return 1;
}
return stbi__err("unknown marker","Corrupt JPEG");
}
// after we see SOS
static int stbi__process_scan_header(stbi__jpeg *z)
{
int i;
int Ls = stbi__get16be(z->s);
z->scan_n = stbi__get8(z->s);
if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
for (i=0; i < z->scan_n; ++i) {
int id = stbi__get8(z->s), which;
int q = stbi__get8(z->s);
for (which = 0; which < z->s->img_n; ++which)
if (z->img_comp[which].id == id)
break;
if (which == z->s->img_n) return 0; // no match
z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
z->order[i] = which;
}
{
int aa;
z->spec_start = stbi__get8(z->s);
z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
aa = stbi__get8(z->s);
z->succ_high = (aa >> 4);
z->succ_low = (aa & 15);
if (z->progressive) {
if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
return stbi__err("bad SOS", "Corrupt JPEG");
} else {
if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
z->spec_end = 63;
}
}
return 1;
}
static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
{
int i;
for (i=0; i < ncomp; ++i) {
if (z->img_comp[i].raw_data) {
STBI_FREE(z->img_comp[i].raw_data);
z->img_comp[i].raw_data = NULL;
z->img_comp[i].data = NULL;
}
if (z->img_comp[i].raw_coeff) {
STBI_FREE(z->img_comp[i].raw_coeff);
z->img_comp[i].raw_coeff = 0;
z->img_comp[i].coeff = 0;
}
if (z->img_comp[i].linebuf) {
STBI_FREE(z->img_comp[i].linebuf);
z->img_comp[i].linebuf = NULL;
}
}
return why;
}
static int stbi__process_frame_header(stbi__jpeg *z, int scan)
{
stbi__context *s = z->s;
int Lf,p,i,q, h_max=1,v_max=1,c;
Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
c = stbi__get8(s);
if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG");
s->img_n = c;
for (i=0; i < c; ++i) {
z->img_comp[i].data = NULL;
z->img_comp[i].linebuf = NULL;
}
if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
z->rgb = 0;
for (i=0; i < s->img_n; ++i) {
static unsigned char rgb[3] = { 'R', 'G', 'B' };
z->img_comp[i].id = stbi__get8(s);
if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
++z->rgb;
q = stbi__get8(s);
z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
}
if (scan != STBI__SCAN_load) return 1;
if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode");
for (i=0; i < s->img_n; ++i) {
if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
}
// compute interleaved mcu info
z->img_h_max = h_max;
z->img_v_max = v_max;
z->img_mcu_w = h_max * 8;
z->img_mcu_h = v_max * 8;
// these sizes can't be more than 17 bits
z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
for (i=0; i < s->img_n; ++i) {
// number of effective pixels (e.g. for non-interleaved MCU)
z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
// to simplify generation, we'll allocate enough memory to decode
// the bogus oversized data from using interleaved MCUs and their
// big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
// discard the extra data until colorspace conversion
//
// img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier)
// so these muls can't overflow with 32-bit ints (which we require)
z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
z->img_comp[i].coeff = 0;
z->img_comp[i].raw_coeff = 0;
z->img_comp[i].linebuf = NULL;
z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
if (z->img_comp[i].raw_data == NULL)
return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
// align blocks for idct using mmx/sse
z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
if (z->progressive) {
// w2, h2 are multiples of 8 (see above)
z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
if (z->img_comp[i].raw_coeff == NULL)
return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
}
}
return 1;
}
// use comparisons since in some cases we handle more than one case (e.g. SOF)
#define stbi__DNL(x) ((x) == 0xdc)
#define stbi__SOI(x) ((x) == 0xd8)
#define stbi__EOI(x) ((x) == 0xd9)
#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
#define stbi__SOS(x) ((x) == 0xda)
#define stbi__SOF_progressive(x) ((x) == 0xc2)
static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
{
int m;
z->jfif = 0;
z->app14_color_transform = -1; // valid values are 0,1,2
z->marker = STBI__MARKER_none; // initialize cached marker to empty
m = stbi__get_marker(z);
if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
if (scan == STBI__SCAN_type) return 1;
m = stbi__get_marker(z);
while (!stbi__SOF(m)) {
if (!stbi__process_marker(z,m)) return 0;
m = stbi__get_marker(z);
while (m == STBI__MARKER_none) {
// some files have extra padding after their blocks, so ok, we'll scan
if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
m = stbi__get_marker(z);
}
}
z->progressive = stbi__SOF_progressive(m);
if (!stbi__process_frame_header(z, scan)) return 0;
return 1;
}
// decode image to YCbCr format
static int stbi__decode_jpeg_image(stbi__jpeg *j)
{
int m;
for (m = 0; m < 4; m++) {
j->img_comp[m].raw_data = NULL;
j->img_comp[m].raw_coeff = NULL;
}
j->restart_interval = 0;
if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
m = stbi__get_marker(j);
while (!stbi__EOI(m)) {
if (stbi__SOS(m)) {
if (!stbi__process_scan_header(j)) return 0;
if (!stbi__parse_entropy_coded_data(j)) return 0;
if (j->marker == STBI__MARKER_none ) {
// handle 0s at the end of image data from IP Kamera 9060
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
if (x == 255) {
j->marker = stbi__get8(j->s);
break;
}
}
// if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
}
} else if (stbi__DNL(m)) {
int Ld = stbi__get16be(j->s);
stbi__uint32 NL = stbi__get16be(j->s);
if (Ld != 4) stbi__err("bad DNL len", "Corrupt JPEG");
if (NL != j->s->img_y) stbi__err("bad DNL height", "Corrupt JPEG");
} else {
if (!stbi__process_marker(j, m)) return 0;
}
m = stbi__get_marker(j);
}
if (j->progressive)
stbi__jpeg_finish(j);
return 1;
}
// static jfif-centered resampling (across block boundaries)
typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
int w, int hs);
#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
STBI_NOTUSED(out);
STBI_NOTUSED(in_far);
STBI_NOTUSED(w);
STBI_NOTUSED(hs);
return in_near;
}
static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
// need to generate two samples vertically for every one in input
int i;
STBI_NOTUSED(hs);
for (i=0; i < w; ++i)
out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
return out;
}
static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
// need to generate two samples horizontally for every one in input
int i;
stbi_uc *input = in_near;
if (w == 1) {
// if only one sample, can't do any interpolation
out[0] = out[1] = input[0];
return out;
}
out[0] = input[0];
out[1] = stbi__div4(input[0]*3 + input[1] + 2);
for (i=1; i < w-1; ++i) {
int n = 3*input[i]+2;
out[i*2+0] = stbi__div4(n+input[i-1]);
out[i*2+1] = stbi__div4(n+input[i+1]);
}
out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
out[i*2+1] = input[w-1];
STBI_NOTUSED(in_far);
STBI_NOTUSED(hs);
return out;
}
#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
// need to generate 2x2 samples for every one in input
int i,t0,t1;
if (w == 1) {
out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
return out;
}
t1 = 3*in_near[0] + in_far[0];
out[0] = stbi__div4(t1+2);
for (i=1; i < w; ++i) {
t0 = t1;
t1 = 3*in_near[i]+in_far[i];
out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
}
out[w*2-1] = stbi__div4(t1+2);
STBI_NOTUSED(hs);
return out;
}
#if defined(STBI_SSE2) || defined(STBI_NEON)
static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
// need to generate 2x2 samples for every one in input
int i=0,t0,t1;
if (w == 1) {
out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
return out;
}
t1 = 3*in_near[0] + in_far[0];
// process groups of 8 pixels for as long as we can.
// note we can't handle the last pixel in a row in this loop
// because we need to handle the filter boundary conditions.
for (; i < ((w-1) & ~7); i += 8) {
#if defined(STBI_SSE2)
// load and perform the vertical filtering pass
// this uses 3*x + y = 4*x + (y - x)
__m128i zero = _mm_setzero_si128();
__m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i));
__m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
__m128i farw = _mm_unpacklo_epi8(farb, zero);
__m128i nearw = _mm_unpacklo_epi8(nearb, zero);
__m128i diff = _mm_sub_epi16(farw, nearw);
__m128i nears = _mm_slli_epi16(nearw, 2);
__m128i curr = _mm_add_epi16(nears, diff); // current row
// horizontal filter works the same based on shifted vers of current
// row. "prev" is current row shifted right by 1 pixel; we need to
// insert the previous pixel value (from t1).
// "next" is current row shifted left by 1 pixel, with first pixel
// of next block of 8 pixels added in.
__m128i prv0 = _mm_slli_si128(curr, 2);
__m128i nxt0 = _mm_srli_si128(curr, 2);
__m128i prev = _mm_insert_epi16(prv0, t1, 0);
__m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
// horizontal filter, polyphase implementation since it's convenient:
// even pixels = 3*cur + prev = cur*4 + (prev - cur)
// odd pixels = 3*cur + next = cur*4 + (next - cur)
// note the shared term.
__m128i bias = _mm_set1_epi16(8);
__m128i curs = _mm_slli_epi16(curr, 2);
__m128i prvd = _mm_sub_epi16(prev, curr);
__m128i nxtd = _mm_sub_epi16(next, curr);
__m128i curb = _mm_add_epi16(curs, bias);
__m128i even = _mm_add_epi16(prvd, curb);
__m128i odd = _mm_add_epi16(nxtd, curb);
// interleave even and odd pixels, then undo scaling.
__m128i int0 = _mm_unpacklo_epi16(even, odd);
__m128i int1 = _mm_unpackhi_epi16(even, odd);
__m128i de0 = _mm_srli_epi16(int0, 4);
__m128i de1 = _mm_srli_epi16(int1, 4);
// pack and write output
__m128i outv = _mm_packus_epi16(de0, de1);
_mm_storeu_si128((__m128i *) (out + i*2), outv);
#elif defined(STBI_NEON)
// load and perform the vertical filtering pass
// this uses 3*x + y = 4*x + (y - x)
uint8x8_t farb = vld1_u8(in_far + i);
uint8x8_t nearb = vld1_u8(in_near + i);
int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
int16x8_t curr = vaddq_s16(nears, diff); // current row
// horizontal filter works the same based on shifted vers of current
// row. "prev" is current row shifted right by 1 pixel; we need to
// insert the previous pixel value (from t1).
// "next" is current row shifted left by 1 pixel, with first pixel
// of next block of 8 pixels added in.
int16x8_t prv0 = vextq_s16(curr, curr, 7);
int16x8_t nxt0 = vextq_s16(curr, curr, 1);
int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
// horizontal filter, polyphase implementation since it's convenient:
// even pixels = 3*cur + prev = cur*4 + (prev - cur)
// odd pixels = 3*cur + next = cur*4 + (next - cur)
// note the shared term.
int16x8_t curs = vshlq_n_s16(curr, 2);
int16x8_t prvd = vsubq_s16(prev, curr);
int16x8_t nxtd = vsubq_s16(next, curr);
int16x8_t even = vaddq_s16(curs, prvd);
int16x8_t odd = vaddq_s16(curs, nxtd);
// undo scaling and round, then store with even/odd phases interleaved
uint8x8x2_t o;
o.val[0] = vqrshrun_n_s16(even, 4);
o.val[1] = vqrshrun_n_s16(odd, 4);
vst2_u8(out + i*2, o);
#endif
// "previous" value for next iter
t1 = 3*in_near[i+7] + in_far[i+7];
}
t0 = t1;
t1 = 3*in_near[i] + in_far[i];
out[i*2] = stbi__div16(3*t1 + t0 + 8);
for (++i; i < w; ++i) {
t0 = t1;
t1 = 3*in_near[i]+in_far[i];
out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
}
out[w*2-1] = stbi__div4(t1+2);
STBI_NOTUSED(hs);
return out;
}
#endif
static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
{
// resample with nearest-neighbor
int i,j;
STBI_NOTUSED(in_far);
for (i=0; i < w; ++i)
for (j=0; j < hs; ++j)
out[i*hs+j] = in_near[i];
return out;
}
// this is a reduced-precision calculation of YCbCr-to-RGB introduced
// to make sure the code produces the same results in both SIMD and scalar
#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8)
static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
{
int i;
for (i=0; i < count; ++i) {
int y_fixed = (y[i] << 20) + (1<<19); // rounding
int r,g,b;
int cr = pcr[i] - 128;
int cb = pcb[i] - 128;
r = y_fixed + cr* stbi__float2fixed(1.40200f);
g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
b = y_fixed + cb* stbi__float2fixed(1.77200f);
r >>= 20;
g >>= 20;
b >>= 20;
if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
out[0] = (stbi_uc)r;
out[1] = (stbi_uc)g;
out[2] = (stbi_uc)b;
out[3] = 255;
out += step;
}
}
#if defined(STBI_SSE2) || defined(STBI_NEON)
static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
{
int i = 0;
#ifdef STBI_SSE2
// step == 3 is pretty ugly on the final interleave, and i'm not convinced
// it's useful in practice (you wouldn't use it for textures, for example).
// so just accelerate step == 4 case.
if (step == 4) {
// this is a fairly straightforward implementation and not super-optimized.
__m128i signflip = _mm_set1_epi8(-0x80);
__m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f));
__m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
__m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
__m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f));
__m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
__m128i xw = _mm_set1_epi16(255); // alpha channel
for (; i+7 < count; i += 8) {
// load
__m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
__m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
__m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
__m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
__m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
// unpack to short (and left-shift cr, cb by 8)
__m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
__m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
__m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
// color transform
__m128i yws = _mm_srli_epi16(yw, 4);
__m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
__m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
__m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
__m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
__m128i rws = _mm_add_epi16(cr0, yws);
__m128i gwt = _mm_add_epi16(cb0, yws);
__m128i bws = _mm_add_epi16(yws, cb1);
__m128i gws = _mm_add_epi16(gwt, cr1);
// descale
__m128i rw = _mm_srai_epi16(rws, 4);
__m128i bw = _mm_srai_epi16(bws, 4);
__m128i gw = _mm_srai_epi16(gws, 4);
// back to byte, set up for transpose
__m128i brb = _mm_packus_epi16(rw, bw);
__m128i gxb = _mm_packus_epi16(gw, xw);
// transpose to interleave channels
__m128i t0 = _mm_unpacklo_epi8(brb, gxb);
__m128i t1 = _mm_unpackhi_epi8(brb, gxb);
__m128i o0 = _mm_unpacklo_epi16(t0, t1);
__m128i o1 = _mm_unpackhi_epi16(t0, t1);
// store
_mm_storeu_si128((__m128i *) (out + 0), o0);
_mm_storeu_si128((__m128i *) (out + 16), o1);
out += 32;
}
}
#endif
#ifdef STBI_NEON
// in this version, step=3 support would be easy to add. but is there demand?
if (step == 4) {
// this is a fairly straightforward implementation and not super-optimized.
uint8x8_t signflip = vdup_n_u8(0x80);
int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f));
int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f));
for (; i+7 < count; i += 8) {
// load
uint8x8_t y_bytes = vld1_u8(y + i);
uint8x8_t cr_bytes = vld1_u8(pcr + i);
uint8x8_t cb_bytes = vld1_u8(pcb + i);
int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
// expand to s16
int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
int16x8_t crw = vshll_n_s8(cr_biased, 7);
int16x8_t cbw = vshll_n_s8(cb_biased, 7);
// color transform
int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
int16x8_t rws = vaddq_s16(yws, cr0);
int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
int16x8_t bws = vaddq_s16(yws, cb1);
// undo scaling, round, convert to byte
uint8x8x4_t o;
o.val[0] = vqrshrun_n_s16(rws, 4);
o.val[1] = vqrshrun_n_s16(gws, 4);
o.val[2] = vqrshrun_n_s16(bws, 4);
o.val[3] = vdup_n_u8(255);
// store, interleaving r/g/b/a
vst4_u8(out, o);
out += 8*4;
}
}
#endif
for (; i < count; ++i) {
int y_fixed = (y[i] << 20) + (1<<19); // rounding
int r,g,b;
int cr = pcr[i] - 128;
int cb = pcb[i] - 128;
r = y_fixed + cr* stbi__float2fixed(1.40200f);
g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
b = y_fixed + cb* stbi__float2fixed(1.77200f);
r >>= 20;
g >>= 20;
b >>= 20;
if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
out[0] = (stbi_uc)r;
out[1] = (stbi_uc)g;
out[2] = (stbi_uc)b;
out[3] = 255;
out += step;
}
}
#endif
// set up the kernels
static void stbi__setup_jpeg(stbi__jpeg *j)
{
j->idct_block_kernel = stbi__idct_block;
j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
#ifdef STBI_SSE2
if (stbi__sse2_available()) {
j->idct_block_kernel = stbi__idct_simd;
j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
}
#endif
#ifdef STBI_NEON
j->idct_block_kernel = stbi__idct_simd;
j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
#endif
}
// clean up the temporary component buffers
static void stbi__cleanup_jpeg(stbi__jpeg *j)
{
stbi__free_jpeg_components(j, j->s->img_n, 0);
}
typedef struct
{
resample_row_func resample;
stbi_uc *line0,*line1;
int hs,vs; // expansion factor in each axis
int w_lores; // horizontal pixels pre-expansion
int ystep; // how far through vertical expansion we are
int ypos; // which pre-expansion row we're on
} stbi__resample;
// fast 0..255 * 0..255 => 0..255 rounded multiplication
static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
{
unsigned int t = x*y + 128;
return (stbi_uc) ((t + (t >>8)) >> 8);
}
static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
{
int n, decode_n, is_rgb;
z->s->img_n = 0; // make stbi__cleanup_jpeg safe
// validate req_comp
if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
// load a jpeg image from whichever source, but leave in YCbCr format
if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
// determine actual number of components to generate
n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
if (z->s->img_n == 3 && n < 3 && !is_rgb)
decode_n = 1;
else
decode_n = z->s->img_n;
// resample and color-convert
{
int k;
unsigned int i,j;
stbi_uc *output;
stbi_uc *coutput[4];
stbi__resample res_comp[4];
for (k=0; k < decode_n; ++k) {
stbi__resample *r = &res_comp[k];
// allocate line buffer big enough for upsampling off the edges
// with upsample factor of 4
z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
r->hs = z->img_h_max / z->img_comp[k].h;
r->vs = z->img_v_max / z->img_comp[k].v;
r->ystep = r->vs >> 1;
r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
r->ypos = 0;
r->line0 = r->line1 = z->img_comp[k].data;
if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
else r->resample = stbi__resample_row_generic;
}
// can't error after this so, this is safe
output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
// now go ahead and resample
for (j=0; j < z->s->img_y; ++j) {
stbi_uc *out = output + n * z->s->img_x * j;
for (k=0; k < decode_n; ++k) {
stbi__resample *r = &res_comp[k];
int y_bot = r->ystep >= (r->vs >> 1);
coutput[k] = r->resample(z->img_comp[k].linebuf,
y_bot ? r->line1 : r->line0,
y_bot ? r->line0 : r->line1,
r->w_lores, r->hs);
if (++r->ystep >= r->vs) {
r->ystep = 0;
r->line0 = r->line1;
if (++r->ypos < z->img_comp[k].y)
r->line1 += z->img_comp[k].w2;
}
}
if (n >= 3) {
stbi_uc *y = coutput[0];
if (z->s->img_n == 3) {
if (is_rgb) {
for (i=0; i < z->s->img_x; ++i) {
out[0] = y[i];
out[1] = coutput[1][i];
out[2] = coutput[2][i];
out[3] = 255;
out += n;
}
} else {
z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
}
} else if (z->s->img_n == 4) {
if (z->app14_color_transform == 0) { // CMYK
for (i=0; i < z->s->img_x; ++i) {
stbi_uc k = coutput[3][i];
out[0] = stbi__blinn_8x8(coutput[0][i], k);
out[1] = stbi__blinn_8x8(coutput[1][i], k);
out[2] = stbi__blinn_8x8(coutput[2][i], k);
out[3] = 255;
out += n;
}
} else if (z->app14_color_transform == 2) { // YCCK
z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
for (i=0; i < z->s->img_x; ++i) {
stbi_uc k = coutput[3][i];
out[0] = stbi__blinn_8x8(255 - out[0], k);
out[1] = stbi__blinn_8x8(255 - out[1], k);
out[2] = stbi__blinn_8x8(255 - out[2], k);
out += n;
}
} else { // YCbCr + alpha? Ignore the fourth channel for now
z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
}
} else
for (i=0; i < z->s->img_x; ++i) {
out[0] = out[1] = out[2] = y[i];
out[3] = 255; // not used if n==3
out += n;
}
} else {
if (is_rgb) {
if (n == 1)
for (i=0; i < z->s->img_x; ++i)
*out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
else {
for (i=0; i < z->s->img_x; ++i, out += 2) {
out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
out[1] = 255;
}
}
} else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
for (i=0; i < z->s->img_x; ++i) {
stbi_uc k = coutput[3][i];
stbi_uc r = stbi__blinn_8x8(coutput[0][i], k);
stbi_uc g = stbi__blinn_8x8(coutput[1][i], k);
stbi_uc b = stbi__blinn_8x8(coutput[2][i], k);
out[0] = stbi__compute_y(r, g, b);
out[1] = 255;
out += n;
}
} else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
for (i=0; i < z->s->img_x; ++i) {
out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
out[1] = 255;
out += n;
}
} else {
stbi_uc *y = coutput[0];
if (n == 1)
for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
else
for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
}
}
}
stbi__cleanup_jpeg(z);
*out_x = z->s->img_x;
*out_y = z->s->img_y;
if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
return output;
}
}
static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
{
unsigned char* result;
stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
STBI_NOTUSED(ri);
j->s = s;
stbi__setup_jpeg(j);
result = load_jpeg_image(j, x,y,comp,req_comp);
STBI_FREE(j);
return result;
}
static int stbi__jpeg_test(stbi__context *s)
{
int r;
stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
j->s = s;
stbi__setup_jpeg(j);
r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
stbi__rewind(s);
STBI_FREE(j);
return r;
}
static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
{
if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
stbi__rewind( j->s );
return 0;
}
if (x) *x = j->s->img_x;
if (y) *y = j->s->img_y;
if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
return 1;
}
static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
{
int result;
stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
j->s = s;
result = stbi__jpeg_info_raw(j, x, y, comp);
STBI_FREE(j);
return result;
}
#endif
// public domain zlib decode v0.2 Sean Barrett 2006-11-18
// simple implementation
// - all input must be provided in an upfront buffer
// - all output is written to a single output buffer (can malloc/realloc)
// performance
// - fast huffman
#ifndef STBI_NO_ZLIB
// fast-way is faster to check than jpeg huffman, but slow way is slower
#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
// zlib-style huffman encoding
// (jpegs packs from left, zlib from right, so can't share code)
typedef struct
{
stbi__uint16 fast[1 << STBI__ZFAST_BITS];
stbi__uint16 firstcode[16];
int maxcode[17];
stbi__uint16 firstsymbol[16];
stbi_uc size[288];
stbi__uint16 value[288];
} stbi__zhuffman;
stbi_inline static int stbi__bitreverse16(int n)
{
n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
return n;
}
stbi_inline static int stbi__bit_reverse(int v, int bits)
{
STBI_ASSERT(bits <= 16);
// to bit reverse n bits, reverse 16 and shift
// e.g. 11 bits, bit reverse and shift away 5
return stbi__bitreverse16(v) >> (16-bits);
}
static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num)
{
int i,k=0;
int code, next_code[16], sizes[17];
// DEFLATE spec for generating codes
memset(sizes, 0, sizeof(sizes));
memset(z->fast, 0, sizeof(z->fast));
for (i=0; i < num; ++i)
++sizes[sizelist[i]];
sizes[0] = 0;
for (i=1; i < 16; ++i)
if (sizes[i] > (1 << i))
return stbi__err("bad sizes", "Corrupt PNG");
code = 0;
for (i=1; i < 16; ++i) {
next_code[i] = code;
z->firstcode[i] = (stbi__uint16) code;
z->firstsymbol[i] = (stbi__uint16) k;
code = (code + sizes[i]);
if (sizes[i])
if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
z->maxcode[i] = code << (16-i); // preshift for inner loop
code <<= 1;
k += sizes[i];
}
z->maxcode[16] = 0x10000; // sentinel
for (i=0; i < num; ++i) {
int s = sizelist[i];
if (s) {
int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
z->size [c] = (stbi_uc ) s;
z->value[c] = (stbi__uint16) i;
if (s <= STBI__ZFAST_BITS) {
int j = stbi__bit_reverse(next_code[s],s);
while (j < (1 << STBI__ZFAST_BITS)) {
z->fast[j] = fastv;
j += (1 << s);
}
}
++next_code[s];
}
}
return 1;
}
// zlib-from-memory implementation for PNG reading
// because PNG allows splitting the zlib stream arbitrarily,
// and it's annoying structurally to have PNG call ZLIB call PNG,
// we require PNG read all the IDATs and combine them into a single
// memory buffer
typedef struct
{
stbi_uc *zbuffer, *zbuffer_end;
int num_bits;
stbi__uint32 code_buffer;
char *zout;
char *zout_start;
char *zout_end;
int z_expandable;
stbi__zhuffman z_length, z_distance;
} stbi__zbuf;
stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
{
if (z->zbuffer >= z->zbuffer_end) return 0;
return *z->zbuffer++;
}
static void stbi__fill_bits(stbi__zbuf *z)
{
do {
STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
z->num_bits += 8;
} while (z->num_bits <= 24);
}
stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
{
unsigned int k;
if (z->num_bits < n) stbi__fill_bits(z);
k = z->code_buffer & ((1 << n) - 1);
z->code_buffer >>= n;
z->num_bits -= n;
return k;
}
static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
{
int b,s,k;
// not resolved by fast table, so compute it the slow way
// use jpeg approach, which requires MSbits at top
k = stbi__bit_reverse(a->code_buffer, 16);
for (s=STBI__ZFAST_BITS+1; ; ++s)
if (k < z->maxcode[s])
break;
if (s == 16) return -1; // invalid code!
// code size is s, so:
b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
STBI_ASSERT(z->size[b] == s);
a->code_buffer >>= s;
a->num_bits -= s;
return z->value[b];
}
stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
{
int b,s;
if (a->num_bits < 16) stbi__fill_bits(a);
b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
if (b) {
s = b >> 9;
a->code_buffer >>= s;
a->num_bits -= s;
return b & 511;
}
return stbi__zhuffman_decode_slowpath(a, z);
}
static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes
{
char *q;
int cur, limit, old_limit;
z->zout = zout;
if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
cur = (int) (z->zout - z->zout_start);
limit = old_limit = (int) (z->zout_end - z->zout_start);
while (cur + n > limit)
limit *= 2;
q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
STBI_NOTUSED(old_limit);
if (q == NULL) return stbi__err("outofmem", "Out of memory");
z->zout_start = q;
z->zout = q + cur;
z->zout_end = q + limit;
return 1;
}
static int stbi__zlength_base[31] = {
3,4,5,6,7,8,9,10,11,13,
15,17,19,23,27,31,35,43,51,59,
67,83,99,115,131,163,195,227,258,0,0 };
static int stbi__zlength_extra[31]=
{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
static int stbi__zdist_extra[32] =
{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
static int stbi__parse_huffman_block(stbi__zbuf *a)
{
char *zout = a->zout;
for(;;) {
int z = stbi__zhuffman_decode(a, &a->z_length);
if (z < 256) {
if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
if (zout >= a->zout_end) {
if (!stbi__zexpand(a, zout, 1)) return 0;
zout = a->zout;
}
*zout++ = (char) z;
} else {
stbi_uc *p;
int len,dist;
if (z == 256) {
a->zout = zout;
return 1;
}
z -= 257;
len = stbi__zlength_base[z];
if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
z = stbi__zhuffman_decode(a, &a->z_distance);
if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
dist = stbi__zdist_base[z];
if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
if (zout + len > a->zout_end) {
if (!stbi__zexpand(a, zout, len)) return 0;
zout = a->zout;
}
p = (stbi_uc *) (zout - dist);
if (dist == 1) { // run of one byte; common in images.
stbi_uc v = *p;
if (len) { do *zout++ = v; while (--len); }
} else {
if (len) { do *zout++ = *p++; while (--len); }
}
}
}
}
static int stbi__compute_huffman_codes(stbi__zbuf *a)
{
static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
stbi__zhuffman z_codelength;
stbi_uc lencodes[286+32+137];//padding for maximum single op
stbi_uc codelength_sizes[19];
int i,n;
int hlit = stbi__zreceive(a,5) + 257;
int hdist = stbi__zreceive(a,5) + 1;
int hclen = stbi__zreceive(a,4) + 4;
int ntot = hlit + hdist;
memset(codelength_sizes, 0, sizeof(codelength_sizes));
for (i=0; i < hclen; ++i) {
int s = stbi__zreceive(a,3);
codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
}
if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
n = 0;
while (n < ntot) {
int c = stbi__zhuffman_decode(a, &z_codelength);
if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
if (c < 16)
lencodes[n++] = (stbi_uc) c;
else {
stbi_uc fill = 0;
if (c == 16) {
c = stbi__zreceive(a,2)+3;
if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
fill = lencodes[n-1];
} else if (c == 17)
c = stbi__zreceive(a,3)+3;
else {
STBI_ASSERT(c == 18);
c = stbi__zreceive(a,7)+11;
}
if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
memset(lencodes+n, fill, c);
n += c;
}
}
if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG");
if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
return 1;
}
static int stbi__parse_uncompressed_block(stbi__zbuf *a)
{
stbi_uc header[4];
int len,nlen,k;
if (a->num_bits & 7)
stbi__zreceive(a, a->num_bits & 7); // discard
// drain the bit-packed data into header
k = 0;
while (a->num_bits > 0) {
header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
a->code_buffer >>= 8;
a->num_bits -= 8;
}
STBI_ASSERT(a->num_bits == 0);
// now fill header the normal way
while (k < 4)
header[k++] = stbi__zget8(a);
len = header[1] * 256 + header[0];
nlen = header[3] * 256 + header[2];
if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
if (a->zout + len > a->zout_end)
if (!stbi__zexpand(a, a->zout, len)) return 0;
memcpy(a->zout, a->zbuffer, len);
a->zbuffer += len;
a->zout += len;
return 1;
}
static int stbi__parse_zlib_header(stbi__zbuf *a)
{
int cmf = stbi__zget8(a);
int cm = cmf & 15;
/* int cinfo = cmf >> 4; */
int flg = stbi__zget8(a);
if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
// window = 1 << (8 + cinfo)... but who cares, we fully buffer output
return 1;
}
static const stbi_uc stbi__zdefault_length[288] =
{
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
};
static const stbi_uc stbi__zdefault_distance[32] =
{
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
};
/*
Init algorithm:
{
int i; // use <= to match clearly with spec
for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8;
for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9;
for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7;
for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8;
for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5;
}
*/
static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
{
int final, type;
if (parse_header)
if (!stbi__parse_zlib_header(a)) return 0;
a->num_bits = 0;
a->code_buffer = 0;
do {
final = stbi__zreceive(a,1);
type = stbi__zreceive(a,2);
if (type == 0) {
if (!stbi__parse_uncompressed_block(a)) return 0;
} else if (type == 3) {
return 0;
} else {
if (type == 1) {
// use fixed code lengths
if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0;
if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0;
} else {
if (!stbi__compute_huffman_codes(a)) return 0;
}
if (!stbi__parse_huffman_block(a)) return 0;
}
} while (!final);
return 1;
}
static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
{
a->zout_start = obuf;
a->zout = obuf;
a->zout_end = obuf + olen;
a->z_expandable = exp;
return stbi__parse_zlib(a, parse_header);
}
STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
{
stbi__zbuf a;
char *p = (char *) stbi__malloc(initial_size);
if (p == NULL) return NULL;
a.zbuffer = (stbi_uc *) buffer;
a.zbuffer_end = (stbi_uc *) buffer + len;
if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
if (outlen) *outlen = (int) (a.zout - a.zout_start);
return a.zout_start;
} else {
STBI_FREE(a.zout_start);
return NULL;
}
}
STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
{
return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
}
STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
{
stbi__zbuf a;
char *p = (char *) stbi__malloc(initial_size);
if (p == NULL) return NULL;
a.zbuffer = (stbi_uc *) buffer;
a.zbuffer_end = (stbi_uc *) buffer + len;
if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
if (outlen) *outlen = (int) (a.zout - a.zout_start);
return a.zout_start;
} else {
STBI_FREE(a.zout_start);
return NULL;
}
}
STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
{
stbi__zbuf a;
a.zbuffer = (stbi_uc *) ibuffer;
a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
return (int) (a.zout - a.zout_start);
else
return -1;
}
STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
{
stbi__zbuf a;
char *p = (char *) stbi__malloc(16384);
if (p == NULL) return NULL;
a.zbuffer = (stbi_uc *) buffer;
a.zbuffer_end = (stbi_uc *) buffer+len;
if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
if (outlen) *outlen = (int) (a.zout - a.zout_start);
return a.zout_start;
} else {
STBI_FREE(a.zout_start);
return NULL;
}
}
STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
{
stbi__zbuf a;
a.zbuffer = (stbi_uc *) ibuffer;
a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
return (int) (a.zout - a.zout_start);
else
return -1;
}
#endif
// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
// simple implementation
// - only 8-bit samples
// - no CRC checking
// - allocates lots of intermediate memory
// - avoids problem of streaming data between subsystems
// - avoids explicit window management
// performance
// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
#ifndef STBI_NO_PNG
typedef struct
{
stbi__uint32 length;
stbi__uint32 type;
} stbi__pngchunk;
static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
{
stbi__pngchunk c;
c.length = stbi__get32be(s);
c.type = stbi__get32be(s);
return c;
}
static int stbi__check_png_header(stbi__context *s)
{
static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
int i;
for (i=0; i < 8; ++i)
if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
return 1;
}
typedef struct
{
stbi__context *s;
stbi_uc *idata, *expanded, *out;
int depth;
} stbi__png;
enum {
STBI__F_none=0,
STBI__F_sub=1,
STBI__F_up=2,
STBI__F_avg=3,
STBI__F_paeth=4,
// synthetic filters used for first scanline to avoid needing a dummy row of 0s
STBI__F_avg_first,
STBI__F_paeth_first
};
static stbi_uc first_row_filter[5] =
{
STBI__F_none,
STBI__F_sub,
STBI__F_none,
STBI__F_avg_first,
STBI__F_paeth_first
};
static int stbi__paeth(int a, int b, int c)
{
int p = a + b - c;
int pa = abs(p-a);
int pb = abs(p-b);
int pc = abs(p-c);
if (pa <= pb && pa <= pc) return a;
if (pb <= pc) return b;
return c;
}
static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
// create the png data from post-deflated data
static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
{
int bytes = (depth == 16? 2 : 1);
stbi__context *s = a->s;
stbi__uint32 i,j,stride = x*out_n*bytes;
stbi__uint32 img_len, img_width_bytes;
int k;
int img_n = s->img_n; // copy it into a local for later
int output_bytes = out_n*bytes;
int filter_bytes = img_n*bytes;
int width = x;
STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
if (!a->out) return stbi__err("outofmem", "Out of memory");
img_width_bytes = (((img_n * x * depth) + 7) >> 3);
img_len = (img_width_bytes + 1) * y;
if (s->img_x == x && s->img_y == y) {
if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG");
} else { // interlaced:
if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
}
for (j=0; j < y; ++j) {
stbi_uc *cur = a->out + stride*j;
stbi_uc *prior;
int filter = *raw++;
if (filter > 4)
return stbi__err("invalid filter","Corrupt PNG");
if (depth < 8) {
STBI_ASSERT(img_width_bytes <= x);
cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
filter_bytes = 1;
width = img_width_bytes;
}
prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above
// if first row, use special filter that doesn't sample previous row
if (j == 0) filter = first_row_filter[filter];
// handle first byte explicitly
for (k=0; k < filter_bytes; ++k) {
switch (filter) {
case STBI__F_none : cur[k] = raw[k]; break;
case STBI__F_sub : cur[k] = raw[k]; break;
case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
case STBI__F_avg_first : cur[k] = raw[k]; break;
case STBI__F_paeth_first: cur[k] = raw[k]; break;
}
}
if (depth == 8) {
if (img_n != out_n)
cur[img_n] = 255; // first pixel
raw += img_n;
cur += out_n;
prior += out_n;
} else if (depth == 16) {
if (img_n != out_n) {
cur[filter_bytes] = 255; // first pixel top byte
cur[filter_bytes+1] = 255; // first pixel bottom byte
}
raw += filter_bytes;
cur += output_bytes;
prior += output_bytes;
} else {
raw += 1;
cur += 1;
prior += 1;
}
// this is a little gross, so that we don't switch per-pixel or per-component
if (depth < 8 || img_n == out_n) {
int nk = (width - 1)*filter_bytes;
#define STBI__CASE(f) \
case f: \
for (k=0; k < nk; ++k)
switch (filter) {
// "none" filter turns into a memcpy here; make that explicit.
case STBI__F_none: memcpy(cur, raw, nk); break;
STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break;
STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break;
STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break;
STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break;
STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); } break;
}
#undef STBI__CASE
raw += nk;
} else {
STBI_ASSERT(img_n+1 == out_n);
#define STBI__CASE(f) \
case f: \
for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \
for (k=0; k < filter_bytes; ++k)
switch (filter) {
STBI__CASE(STBI__F_none) { cur[k] = raw[k]; } break;
STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break;
STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break;
STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break;
STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break;
STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],0,0)); } break;
}
#undef STBI__CASE
// the loop above sets the high byte of the pixels' alpha, but for
// 16 bit png files we also need the low byte set. we'll do that here.
if (depth == 16) {
cur = a->out + stride*j; // start at the beginning of the row again
for (i=0; i < x; ++i,cur+=output_bytes) {
cur[filter_bytes+1] = 255;
}
}
}
}
// we make a separate pass to expand bits to pixels; for performance,
// this could run two scanlines behind the above code, so it won't
// intefere with filtering but will still be in the cache.
if (depth < 8) {
for (j=0; j < y; ++j) {
stbi_uc *cur = a->out + stride*j;
stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes;
// unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
// png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
// note that the final byte might overshoot and write more data than desired.
// we can allocate enough data that this never writes out of memory, but it
// could also overwrite the next scanline. can it overwrite non-empty data
// on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
// so we need to explicitly clamp the final ones
if (depth == 4) {
for (k=x*img_n; k >= 2; k-=2, ++in) {
*cur++ = scale * ((*in >> 4) );
*cur++ = scale * ((*in ) & 0x0f);
}
if (k > 0) *cur++ = scale * ((*in >> 4) );
} else if (depth == 2) {
for (k=x*img_n; k >= 4; k-=4, ++in) {
*cur++ = scale * ((*in >> 6) );
*cur++ = scale * ((*in >> 4) & 0x03);
*cur++ = scale * ((*in >> 2) & 0x03);
*cur++ = scale * ((*in ) & 0x03);
}
if (k > 0) *cur++ = scale * ((*in >> 6) );
if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
} else if (depth == 1) {
for (k=x*img_n; k >= 8; k-=8, ++in) {
*cur++ = scale * ((*in >> 7) );
*cur++ = scale * ((*in >> 6) & 0x01);
*cur++ = scale * ((*in >> 5) & 0x01);
*cur++ = scale * ((*in >> 4) & 0x01);
*cur++ = scale * ((*in >> 3) & 0x01);
*cur++ = scale * ((*in >> 2) & 0x01);
*cur++ = scale * ((*in >> 1) & 0x01);
*cur++ = scale * ((*in ) & 0x01);
}
if (k > 0) *cur++ = scale * ((*in >> 7) );
if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
}
if (img_n != out_n) {
int q;
// insert alpha = 255
cur = a->out + stride*j;
if (img_n == 1) {
for (q=x-1; q >= 0; --q) {
cur[q*2+1] = 255;
cur[q*2+0] = cur[q];
}
} else {
STBI_ASSERT(img_n == 3);
for (q=x-1; q >= 0; --q) {
cur[q*4+3] = 255;
cur[q*4+2] = cur[q*3+2];
cur[q*4+1] = cur[q*3+1];
cur[q*4+0] = cur[q*3+0];
}
}
}
}
} else if (depth == 16) {
// force the image data from big-endian to platform-native.
// this is done in a separate pass due to the decoding relying
// on the data being untouched, but could probably be done
// per-line during decode if care is taken.
stbi_uc *cur = a->out;
stbi__uint16 *cur16 = (stbi__uint16*)cur;
for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) {
*cur16 = (cur[0] << 8) | cur[1];
}
}
return 1;
}
static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
{
int bytes = (depth == 16 ? 2 : 1);
int out_bytes = out_n * bytes;
stbi_uc *final;
int p;
if (!interlaced)
return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
// de-interlacing
final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
for (p=0; p < 7; ++p) {
int xorig[] = { 0,4,0,2,0,1,0 };
int yorig[] = { 0,0,4,0,2,0,1 };
int xspc[] = { 8,8,4,4,2,2,1 };
int yspc[] = { 8,8,8,4,4,2,2 };
int i,j,x,y;
// pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
if (x && y) {
stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
STBI_FREE(final);
return 0;
}
for (j=0; j < y; ++j) {
for (i=0; i < x; ++i) {
int out_y = j*yspc[p]+yorig[p];
int out_x = i*xspc[p]+xorig[p];
memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes,
a->out + (j*x+i)*out_bytes, out_bytes);
}
}
STBI_FREE(a->out);
image_data += img_len;
image_data_len -= img_len;
}
}
a->out = final;
return 1;
}
static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
{
stbi__context *s = z->s;
stbi__uint32 i, pixel_count = s->img_x * s->img_y;
stbi_uc *p = z->out;
// compute color-based transparency, assuming we've
// already got 255 as the alpha value in the output
STBI_ASSERT(out_n == 2 || out_n == 4);
if (out_n == 2) {
for (i=0; i < pixel_count; ++i) {
p[1] = (p[0] == tc[0] ? 0 : 255);
p += 2;
}
} else {
for (i=0; i < pixel_count; ++i) {
if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
p[3] = 0;
p += 4;
}
}
return 1;
}
static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
{
stbi__context *s = z->s;
stbi__uint32 i, pixel_count = s->img_x * s->img_y;
stbi__uint16 *p = (stbi__uint16*) z->out;
// compute color-based transparency, assuming we've
// already got 65535 as the alpha value in the output
STBI_ASSERT(out_n == 2 || out_n == 4);
if (out_n == 2) {
for (i = 0; i < pixel_count; ++i) {
p[1] = (p[0] == tc[0] ? 0 : 65535);
p += 2;
}
} else {
for (i = 0; i < pixel_count; ++i) {
if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
p[3] = 0;
p += 4;
}
}
return 1;
}
static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
{
stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
stbi_uc *p, *temp_out, *orig = a->out;
p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0);
if (p == NULL) return stbi__err("outofmem", "Out of memory");
// between here and free(out) below, exitting would leak
temp_out = p;
if (pal_img_n == 3) {
for (i=0; i < pixel_count; ++i) {
int n = orig[i]*4;
p[0] = palette[n ];
p[1] = palette[n+1];
p[2] = palette[n+2];
p += 3;
}
} else {
for (i=0; i < pixel_count; ++i) {
int n = orig[i]*4;
p[0] = palette[n ];
p[1] = palette[n+1];
p[2] = palette[n+2];
p[3] = palette[n+3];
p += 4;
}
}
STBI_FREE(a->out);
a->out = temp_out;
STBI_NOTUSED(len);
return 1;
}
static int stbi__unpremultiply_on_load = 0;
static int stbi__de_iphone_flag = 0;
STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
{
stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
}
STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
{
stbi__de_iphone_flag = flag_true_if_should_convert;
}
static void stbi__de_iphone(stbi__png *z)
{
stbi__context *s = z->s;
stbi__uint32 i, pixel_count = s->img_x * s->img_y;
stbi_uc *p = z->out;
if (s->img_out_n == 3) { // convert bgr to rgb
for (i=0; i < pixel_count; ++i) {
stbi_uc t = p[0];
p[0] = p[2];
p[2] = t;
p += 3;
}
} else {
STBI_ASSERT(s->img_out_n == 4);
if (stbi__unpremultiply_on_load) {
// convert bgr to rgb and unpremultiply
for (i=0; i < pixel_count; ++i) {
stbi_uc a = p[3];
stbi_uc t = p[0];
if (a) {
p[0] = p[2] * 255 / a;
p[1] = p[1] * 255 / a;
p[2] = t * 255 / a;
} else {
p[0] = p[2];
p[2] = t;
}
p += 4;
}
} else {
// convert bgr to rgb
for (i=0; i < pixel_count; ++i) {
stbi_uc t = p[0];
p[0] = p[2];
p[2] = t;
p += 4;
}
}
}
}
#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
{
stbi_uc palette[1024], pal_img_n=0;
stbi_uc has_trans=0, tc[3];
stbi__uint16 tc16[3];
stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
int first=1,k,interlace=0, color=0, is_iphone=0;
stbi__context *s = z->s;
z->expanded = NULL;
z->idata = NULL;
z->out = NULL;
if (!stbi__check_png_header(s)) return 0;
if (scan == STBI__SCAN_type) return 1;
for (;;) {
stbi__pngchunk c = stbi__get_chunk_header(s);
switch (c.type) {
case STBI__PNG_TYPE('C','g','B','I'):
is_iphone = 1;
stbi__skip(s, c.length);
break;
case STBI__PNG_TYPE('I','H','D','R'): {
int comp,filter;
if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
first = 0;
if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only");
color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG");
if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG");
if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG");
filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG");
interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
if (!pal_img_n) {
s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
if (scan == STBI__SCAN_header) return 1;
} else {
// if paletted, then pal_n is our final components, and
// img_n is # components to decompress/filter.
s->img_n = 1;
if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
// if SCAN_header, have to scan to see if we have a tRNS
}
break;
}
case STBI__PNG_TYPE('P','L','T','E'): {
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
pal_len = c.length / 3;
if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
for (i=0; i < pal_len; ++i) {
palette[i*4+0] = stbi__get8(s);
palette[i*4+1] = stbi__get8(s);
palette[i*4+2] = stbi__get8(s);
palette[i*4+3] = 255;
}
break;
}
case STBI__PNG_TYPE('t','R','N','S'): {
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
if (pal_img_n) {
if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
pal_img_n = 4;
for (i=0; i < c.length; ++i)
palette[i*4+3] = stbi__get8(s);
} else {
if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
has_trans = 1;
if (z->depth == 16) {
for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
} else {
for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
}
}
break;
}
case STBI__PNG_TYPE('I','D','A','T'): {
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
if ((int)(ioff + c.length) < (int)ioff) return 0;
if (ioff + c.length > idata_limit) {
stbi__uint32 idata_limit_old = idata_limit;
stbi_uc *p;
if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
while (ioff + c.length > idata_limit)
idata_limit *= 2;
STBI_NOTUSED(idata_limit_old);
p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
z->idata = p;
}
if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
ioff += c.length;
break;
}
case STBI__PNG_TYPE('I','E','N','D'): {
stbi__uint32 raw_len, bpl;
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if (scan != STBI__SCAN_load) return 1;
if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
// initial guess for decoded data size to avoid unnecessary reallocs
bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
if (z->expanded == NULL) return 0; // zlib should set error
STBI_FREE(z->idata); z->idata = NULL;
if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
s->img_out_n = s->img_n+1;
else
s->img_out_n = s->img_n;
if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0;
if (has_trans) {
if (z->depth == 16) {
if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
} else {
if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
}
}
if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
stbi__de_iphone(z);
if (pal_img_n) {
// pal_img_n == 3 or 4
s->img_n = pal_img_n; // record the actual colors we had
s->img_out_n = pal_img_n;
if (req_comp >= 3) s->img_out_n = req_comp;
if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
return 0;
}
STBI_FREE(z->expanded); z->expanded = NULL;
return 1;
}
default:
// if critical, fail
if (first) return stbi__err("first not IHDR", "Corrupt PNG");
if ((c.type & (1 << 29)) == 0) {
#ifndef STBI_NO_FAILURE_STRINGS
// not threadsafe
static char invalid_chunk[] = "XXXX PNG chunk not known";
invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
#endif
return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
}
stbi__skip(s, c.length);
break;
}
// end of PNG chunk, read and skip CRC
stbi__get32be(s);
}
}
static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri)
{
void *result=NULL;
if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
if (p->depth < 8)
ri->bits_per_channel = 8;
else
ri->bits_per_channel = p->depth;
result = p->out;
p->out = NULL;
if (req_comp && req_comp != p->s->img_out_n) {
if (ri->bits_per_channel == 8)
result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
else
result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
p->s->img_out_n = req_comp;
if (result == NULL) return result;
}
*x = p->s->img_x;
*y = p->s->img_y;
if (n) *n = p->s->img_n;
}
STBI_FREE(p->out); p->out = NULL;
STBI_FREE(p->expanded); p->expanded = NULL;
STBI_FREE(p->idata); p->idata = NULL;
return result;
}
static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
{
stbi__png p;
p.s = s;
return stbi__do_png(&p, x,y,comp,req_comp, ri);
}
static int stbi__png_test(stbi__context *s)
{
int r;
r = stbi__check_png_header(s);
stbi__rewind(s);
return r;
}
static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
{
if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
stbi__rewind( p->s );
return 0;
}
if (x) *x = p->s->img_x;
if (y) *y = p->s->img_y;
if (comp) *comp = p->s->img_n;
return 1;
}
static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
{
stbi__png p;
p.s = s;
return stbi__png_info_raw(&p, x, y, comp);
}
#endif
// Microsoft/Windows BMP image
#ifndef STBI_NO_BMP
static int stbi__bmp_test_raw(stbi__context *s)
{
int r;
int sz;
if (stbi__get8(s) != 'B') return 0;
if (stbi__get8(s) != 'M') return 0;
stbi__get32le(s); // discard filesize
stbi__get16le(s); // discard reserved
stbi__get16le(s); // discard reserved
stbi__get32le(s); // discard data offset
sz = stbi__get32le(s);
r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
return r;
}
static int stbi__bmp_test(stbi__context *s)
{
int r = stbi__bmp_test_raw(s);
stbi__rewind(s);
return r;
}
// returns 0..31 for the highest set bit
static int stbi__high_bit(unsigned int z)
{
int n=0;
if (z == 0) return -1;
if (z >= 0x10000) n += 16, z >>= 16;
if (z >= 0x00100) n += 8, z >>= 8;
if (z >= 0x00010) n += 4, z >>= 4;
if (z >= 0x00004) n += 2, z >>= 2;
if (z >= 0x00002) n += 1, z >>= 1;
return n;
}
static int stbi__bitcount(unsigned int a)
{
a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
a = (a + (a >> 8)); // max 16 per 8 bits
a = (a + (a >> 16)); // max 32 per 8 bits
return a & 0xff;
}
static int stbi__shiftsigned(int v, int shift, int bits)
{
int result;
int z=0;
if (shift < 0) v <<= -shift;
else v >>= shift;
result = v;
z = bits;
while (z < 8) {
result += v >> z;
z += bits;
}
return result;
}
typedef struct
{
int bpp, offset, hsz;
unsigned int mr,mg,mb,ma, all_a;
} stbi__bmp_data;
static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
{
int hsz;
if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
stbi__get32le(s); // discard filesize
stbi__get16le(s); // discard reserved
stbi__get16le(s); // discard reserved
info->offset = stbi__get32le(s);
info->hsz = hsz = stbi__get32le(s);
info->mr = info->mg = info->mb = info->ma = 0;
if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
if (hsz == 12) {
s->img_x = stbi__get16le(s);
s->img_y = stbi__get16le(s);
} else {
s->img_x = stbi__get32le(s);
s->img_y = stbi__get32le(s);
}
if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
info->bpp = stbi__get16le(s);
if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
if (hsz != 12) {
int compress = stbi__get32le(s);
if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
stbi__get32le(s); // discard sizeof
stbi__get32le(s); // discard hres
stbi__get32le(s); // discard vres
stbi__get32le(s); // discard colorsused
stbi__get32le(s); // discard max important
if (hsz == 40 || hsz == 56) {
if (hsz == 56) {
stbi__get32le(s);
stbi__get32le(s);
stbi__get32le(s);
stbi__get32le(s);
}
if (info->bpp == 16 || info->bpp == 32) {
if (compress == 0) {
if (info->bpp == 32) {
info->mr = 0xffu << 16;
info->mg = 0xffu << 8;
info->mb = 0xffu << 0;
info->ma = 0xffu << 24;
info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
} else {
info->mr = 31u << 10;
info->mg = 31u << 5;
info->mb = 31u << 0;
}
} else if (compress == 3) {
info->mr = stbi__get32le(s);
info->mg = stbi__get32le(s);
info->mb = stbi__get32le(s);
// not documented, but generated by photoshop and handled by mspaint
if (info->mr == info->mg && info->mg == info->mb) {
// ?!?!?
return stbi__errpuc("bad BMP", "bad BMP");
}
} else
return stbi__errpuc("bad BMP", "bad BMP");
}
} else {
int i;
if (hsz != 108 && hsz != 124)
return stbi__errpuc("bad BMP", "bad BMP");
info->mr = stbi__get32le(s);
info->mg = stbi__get32le(s);
info->mb = stbi__get32le(s);
info->ma = stbi__get32le(s);
stbi__get32le(s); // discard color space
for (i=0; i < 12; ++i)
stbi__get32le(s); // discard color space parameters
if (hsz == 124) {
stbi__get32le(s); // discard rendering intent
stbi__get32le(s); // discard offset of profile data
stbi__get32le(s); // discard size of profile data
stbi__get32le(s); // discard reserved
}
}
}
return (void *) 1;
}
static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
{
stbi_uc *out;
unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
stbi_uc pal[256][4];
int psize=0,i,j,width;
int flip_vertically, pad, target;
stbi__bmp_data info;
STBI_NOTUSED(ri);
info.all_a = 255;
if (s
gitextract_k539n3_o/
├── .gitignore
├── .gitmodules
├── Algorithm.md
├── C/
│ ├── Makefile
│ ├── Readme.md
│ ├── common.h
│ ├── decode.c
│ ├── decode.h
│ ├── decode_stb.c
│ ├── encode.c
│ ├── encode.h
│ ├── encode_stb.c
│ ├── stb_image.h
│ └── stb_writer.h
├── CodeOfConduct.md
├── Kotlin/
│ ├── .gitignore
│ ├── Readme.md
│ ├── build.gradle
│ ├── demo/
│ │ ├── build.gradle
│ │ ├── proguard-rules.pro
│ │ └── src/
│ │ └── main/
│ │ ├── AndroidManifest.xml
│ │ ├── java/
│ │ │ └── com/
│ │ │ └── wolt/
│ │ │ └── blurhashapp/
│ │ │ └── MainActivity.kt
│ │ └── res/
│ │ ├── drawable/
│ │ │ ├── bg_blue_rounded_rect_8.xml
│ │ │ └── ic_launcher_background.xml
│ │ ├── drawable-v24/
│ │ │ └── ic_launcher_foreground.xml
│ │ ├── layout/
│ │ │ └── activity_main.xml
│ │ ├── mipmap-anydpi-v26/
│ │ │ ├── ic_launcher.xml
│ │ │ └── ic_launcher_round.xml
│ │ └── values/
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ ├── gradle/
│ │ └── wrapper/
│ │ ├── gradle-wrapper.jar
│ │ └── gradle-wrapper.properties
│ ├── gradle.properties
│ ├── gradlew
│ ├── gradlew.bat
│ ├── lib/
│ │ ├── build.gradle
│ │ ├── proguard-rules.pro
│ │ └── src/
│ │ ├── androidTest/
│ │ │ └── java/
│ │ │ └── com/
│ │ │ └── wolt/
│ │ │ └── blurhashkt/
│ │ │ └── BlurHashDecoderTest.kt
│ │ └── main/
│ │ ├── AndroidManifest.xml
│ │ └── java/
│ │ └── com/
│ │ └── wolt/
│ │ └── blurhashkt/
│ │ └── BlurHashDecoder.kt
│ └── settings.gradle
├── License.md
├── Media/
│ └── WhyBlurHash.afphoto
├── Readme.md
├── SECURITY.md
├── Swift/
│ ├── BlurHash.xcodeproj/
│ │ ├── project.pbxproj
│ │ ├── project.xcworkspace/
│ │ │ ├── contents.xcworkspacedata
│ │ │ └── xcshareddata/
│ │ │ ├── BlurHash.xcscmblueprint
│ │ │ └── IDEWorkspaceChecks.plist
│ │ └── xcshareddata/
│ │ └── xcschemes/
│ │ ├── BlurHashKit.xcscheme
│ │ ├── BlurHashTest.xcscheme
│ │ ├── blurhash.xcscheme
│ │ └── libBlurHashKit.xcscheme
│ ├── BlurHashDecode.swift
│ ├── BlurHashEncode.swift
│ ├── BlurHashKit/
│ │ ├── BlurHash.swift
│ │ ├── ColourProbes.swift
│ │ ├── ColourSpace.swift
│ │ ├── EscapeSequences.swift
│ │ ├── FromString.swift
│ │ ├── FromUIImage.swift
│ │ ├── Generation.swift
│ │ ├── Info.plist
│ │ ├── StringCoding.swift
│ │ ├── ToString.swift
│ │ ├── ToUIImage.swift
│ │ └── TupleMaths.swift
│ ├── BlurHashTest/
│ │ ├── AdvancedViewController.swift
│ │ ├── AppDelegate.swift
│ │ ├── Assets.xcassets/
│ │ │ └── AppIcon.appiconset/
│ │ │ └── Contents.json
│ │ ├── Base.lproj/
│ │ │ ├── LaunchScreen.storyboard
│ │ │ └── Main.storyboard
│ │ ├── GeneratedViewController.swift
│ │ ├── Info.plist
│ │ └── SimpleViewController.swift
│ ├── License.txt
│ └── Readme.md
├── TypeScript/
│ ├── .gitignore
│ ├── .npmignore
│ ├── .prettierrc
│ ├── CHANGELOG.md
│ ├── README.md
│ ├── demo/
│ │ └── index.html
│ ├── package.json
│ ├── src/
│ │ ├── base83.ts
│ │ ├── decode.ts
│ │ ├── demo.ts
│ │ ├── encode.ts
│ │ ├── error.ts
│ │ ├── index.ts
│ │ └── utils.ts
│ ├── tsconfig.json
│ ├── tsup.config.ts
│ └── webpack.config.js
└── Website/
├── .babelrc
├── .prettierrc
├── Readme.md
├── deploy.sh
├── package.json
├── src/
│ ├── constants.js
│ ├── index.ejs
│ ├── index.js
│ ├── index.scss
│ ├── sections/
│ │ ├── demo.js
│ │ └── hero.js
│ └── styles/
│ ├── averta.scss
│ ├── base.scss
│ ├── resets.scss
│ ├── utils.scss
│ └── variables.scss
└── webpack.config.js
SYMBOL INDEX (276 symbols across 13 files)
FILE: C/common.h
function linearTosRGB (line 10) | static inline int linearTosRGB(float value) {
function sRGBToLinear (line 16) | static inline float sRGBToLinear(int value) {
function signPow (line 22) | static inline float signPow(float value, float exp) {
FILE: C/decode.c
function clampToUByte (line 6) | static inline uint8_t clampToUByte(int * src) {
function decodeToInt (line 16) | int decodeToInt(const char * string, int start, int end) {
function isValidBlurhash (line 32) | bool isValidBlurhash(const char * blurhash) {
function decodeDC (line 46) | void decodeDC(int value, float * r, float * g, float * b) {
function decodeAC (line 52) | void decodeAC(int value, float maximumValue, float * r, float * g, float...
function decodeToArray (line 62) | int decodeToArray(const char * blurhash, int width, int height, int punc...
function freePixelArray (line 144) | void freePixelArray(uint8_t * pixelArray) {
FILE: C/decode_stb.c
function main (line 6) | int main(int argc, char **argv) {
FILE: C/encode.c
function encodeDC (line 89) | static int encodeDC(float r, float g, float b) {
function encodeAC (line 96) | static int encodeAC(float r, float g, float b, float maximumValue) {
FILE: C/encode_stb.c
function main (line 10) | int main(int argc, const char **argv) {
FILE: C/stb_image.h
type stbi_uc (line 321) | typedef unsigned char stbi_uc;
type stbi_us (line 322) | typedef unsigned short stbi_us;
type stbi_io_callbacks (line 343) | typedef struct
type stbi__uint16 (line 531) | typedef unsigned short stbi__uint16;
type stbi__int16 (line 532) | typedef signed short stbi__int16;
type stbi__uint32 (line 533) | typedef unsigned int stbi__uint32;
type stbi__int32 (line 534) | typedef signed int stbi__int32;
type stbi__uint16 (line 537) | typedef uint16_t stbi__uint16;
type stbi__int16 (line 538) | typedef int16_t stbi__int16;
type stbi__uint32 (line 539) | typedef uint32_t stbi__uint32;
type stbi__int32 (line 540) | typedef int32_t stbi__int32;
function stbi__cpuid3 (line 621) | static int stbi__cpuid3(void)
function stbi__sse2_available (line 642) | static int stbi__sse2_available()
function stbi__sse2_available (line 650) | static int stbi__sse2_available()
type stbi__context (line 681) | typedef struct
function stbi__start_mem (line 701) | static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int...
function stbi__start_callbacks (line 710) | static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c...
function stbi__stdio_read (line 723) | static int stbi__stdio_read(void *user, char *data, int size)
function stbi__stdio_skip (line 728) | static void stbi__stdio_skip(void *user, int n)
function stbi__stdio_eof (line 733) | static int stbi__stdio_eof(void *user)
function stbi__start_file (line 745) | static void stbi__start_file(stbi__context *s, FILE *f)
function stbi__rewind (line 754) | static void stbi__rewind(stbi__context *s)
type stbi__result_info (line 769) | typedef struct
function STBIDEF (line 833) | STBIDEF const char *stbi_failure_reason(void)
function stbi__err (line 838) | static int stbi__err(const char *str)
function stbi__addsizes_valid (line 861) | static int stbi__addsizes_valid(int a, int b)
function stbi__mul2sizes_valid (line 873) | static int stbi__mul2sizes_valid(int a, int b)
function stbi__mad2sizes_valid (line 882) | static int stbi__mad2sizes_valid(int a, int b, int add)
function stbi__mad3sizes_valid (line 888) | static int stbi__mad3sizes_valid(int a, int b, int c, int add)
function stbi__mad4sizes_valid (line 895) | static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
function STBIDEF (line 935) | STBIDEF void stbi_image_free(void *retval_from_stbi_load)
function STBIDEF (line 950) | STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
function stbi_uc (line 1000) | static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, ...
function stbi__uint16 (line 1016) | static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, ...
function stbi__uint16 (line 1069) | static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, ...
function stbi__float_postprocess (line 1108) | static void stbi__float_postprocess(float *result, int *x, int *y, int *...
function FILE (line 1132) | static FILE *stbi__fopen(char const *filename, char const *mode)
function STBIDEF (line 1145) | STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *co...
function STBIDEF (line 1155) | STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp,...
function STBIDEF (line 1168) | STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, in...
function STBIDEF (line 1181) | STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int ...
function STBIDEF (line 1194) | STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, i...
function STBIDEF (line 1201) | STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk,...
function STBIDEF (line 1227) | STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, in...
function STBIDEF (line 1234) | STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, ...
function STBIDEF (line 1242) | STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *com...
function STBIDEF (line 1252) | STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, ...
function STBIDEF (line 1266) | STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
function STBIDEF (line 1280) | STBIDEF int stbi_is_hdr (char const *filename)
function STBIDEF (line 1291) | STBIDEF int stbi_is_hdr_from_file(FILE *f)
function STBIDEF (line 1304) | STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clb...
function STBIDEF (line 1320) | STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = ga...
function STBIDEF (line 1321) | STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = sc...
function STBIDEF (line 1326) | STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = ...
function STBIDEF (line 1327) | STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = ...
function stbi__refill_buffer (line 1342) | static void stbi__refill_buffer(stbi__context *s)
function stbi_inline (line 1358) | stbi_inline static stbi_uc stbi__get8(stbi__context *s)
function stbi_inline (line 1369) | stbi_inline static int stbi__at_eof(stbi__context *s)
function stbi__skip (line 1381) | static void stbi__skip(stbi__context *s, int n)
function stbi__getn (line 1398) | static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
function stbi__get16be (line 1422) | static int stbi__get16be(stbi__context *s)
function stbi__uint32 (line 1428) | static stbi__uint32 stbi__get32be(stbi__context *s)
function stbi__get16le (line 1437) | static int stbi__get16le(stbi__context *s)
function stbi__uint32 (line 1445) | static stbi__uint32 stbi__get32le(stbi__context *s)
function stbi_uc (line 1466) | static stbi_uc stbi__compute_y(int r, int g, int b)
function stbi__uint16 (line 1515) | static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
function stbi__uint16 (line 1520) | static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_...
function stbi_uc (line 1587) | static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
type stbi__huffman (line 1641) | typedef struct
type stbi__jpeg (line 1652) | typedef struct
function stbi__build_huffman (line 1706) | static int stbi__build_huffman(stbi__huffman *h, int *count)
function stbi__build_fast_ac (line 1749) | static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
function stbi__grow_buffer_unsafe (line 1774) | static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
function stbi_inline (line 1796) | stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffm...
function stbi_inline (line 1850) | stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
function stbi_inline (line 1866) | stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
function stbi_inline (line 1877) | stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
function stbi__jpeg_decode_block (line 1905) | static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__...
function stbi__jpeg_decode_block_prog_dc (line 1957) | static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64]...
function stbi__jpeg_decode_block_prog_ac (line 1984) | static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64]...
function stbi_inline (line 2104) | stbi_inline static stbi_uc stbi__clamp(int x)
function stbi__idct_block (line 2155) | static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
function stbi__idct_simd (line 2218) | static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
function stbi__idct_simd (line 2399) | static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
function stbi_uc (line 2607) | static stbi_uc stbi__get_marker(stbi__jpeg *j)
function stbi__jpeg_reset (line 2624) | static void stbi__jpeg_reset(stbi__jpeg *j)
function stbi__parse_entropy_coded_data (line 2637) | static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
function stbi__jpeg_dequantize (line 2761) | static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
function stbi__jpeg_finish (line 2768) | static void stbi__jpeg_finish(stbi__jpeg *z)
function stbi__process_marker (line 2787) | static int stbi__process_marker(stbi__jpeg *z, int m)
function stbi__process_scan_header (line 2890) | static int stbi__process_scan_header(stbi__jpeg *z)
function stbi__free_jpeg_components (line 2929) | static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
function stbi__process_frame_header (line 2951) | static int stbi__process_frame_header(stbi__jpeg *z, int scan)
function stbi__decode_jpeg_header (line 3043) | static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
function stbi__decode_jpeg_image (line 3068) | static int stbi__decode_jpeg_image(stbi__jpeg *j)
type stbi_uc (line 3110) | typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_u...
function stbi_uc (line 3115) | static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *...
function stbi_uc (line 3124) | static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, s...
function stbi_uc (line 3134) | static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, ...
function stbi_uc (line 3164) | static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, ...
function stbi_uc (line 3189) | static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_n...
function stbi_uc (line 3305) | static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_nea...
function stbi__YCbCr_to_RGB_row (line 3319) | static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const...
function stbi__YCbCr_to_RGB_simd (line 3345) | static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi...
function stbi__setup_jpeg (line 3480) | static void stbi__setup_jpeg(stbi__jpeg *j)
function stbi__cleanup_jpeg (line 3502) | static void stbi__cleanup_jpeg(stbi__jpeg *j)
type stbi__resample (line 3507) | typedef struct
function stbi_uc (line 3518) | static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
function stbi_uc (line 3524) | static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, i...
function stbi__jpeg_test (line 3695) | static int stbi__jpeg_test(stbi__context *s)
function stbi__jpeg_info_raw (line 3707) | static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
function stbi__jpeg_info (line 3719) | static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
type stbi__zhuffman (line 3745) | typedef struct
function stbi_inline (line 3755) | stbi_inline static int stbi__bitreverse16(int n)
function stbi_inline (line 3764) | stbi_inline static int stbi__bit_reverse(int v, int bits)
function stbi__zbuild_huffman (line 3772) | static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizeli...
type stbi__zbuf (line 3825) | typedef struct
function stbi_inline (line 3839) | stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
function stbi__fill_bits (line 3845) | static void stbi__fill_bits(stbi__zbuf *z)
function stbi__zreceive (line 3854) | int stbi__zreceive(stbi__zbuf *z, int n)
function stbi__zhuffman_decode_slowpath (line 3864) | static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
function stbi_inline (line 3882) | stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffm...
function stbi__zexpand (line 3896) | static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to m...
function stbi__parse_huffman_block (line 3929) | static int stbi__parse_huffman_block(stbi__zbuf *a)
function stbi__compute_huffman_codes (line 3971) | static int stbi__compute_huffman_codes(stbi__zbuf *a)
function stbi__parse_uncompressed_block (line 4020) | static int stbi__parse_uncompressed_block(stbi__zbuf *a)
function stbi__parse_zlib_header (line 4049) | static int stbi__parse_zlib_header(stbi__zbuf *a)
function stbi__parse_zlib (line 4091) | static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
function stbi__do_zlib (line 4119) | static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, i...
function STBIDEF (line 4129) | STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int ...
function STBIDEF (line 4145) | STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *...
function STBIDEF (line 4150) | STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *b...
function STBIDEF (line 4166) | STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const ...
function STBIDEF (line 4177) | STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int l...
function STBIDEF (line 4193) | STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, co...
type stbi__pngchunk (line 4216) | typedef struct
function stbi__pngchunk (line 4222) | static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
function stbi__check_png_header (line 4230) | static int stbi__check_png_header(stbi__context *s)
type stbi__png (line 4239) | typedef struct
function stbi__paeth (line 4267) | static int stbi__paeth(int a, int b, int c)
function stbi__create_png_image_raw (line 4281) | static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__...
function stbi__create_png_image (line 4492) | static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stb...
function stbi__compute_transparency (line 4536) | static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int o...
function stbi__compute_transparency16 (line 4561) | static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3]...
function stbi__expand_png_palette (line 4586) | static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int ...
function STBIDEF (line 4626) | STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpr...
function STBIDEF (line 4631) | STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_conv...
function stbi__de_iphone (line 4636) | static void stbi__de_iphone(stbi__png *z)
function stbi__parse_png_file (line 4680) | static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
function stbi__png_test (line 4886) | static int stbi__png_test(stbi__context *s)
function stbi__png_info_raw (line 4894) | static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
function stbi__png_info (line 4906) | static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__bmp_test_raw (line 4917) | static int stbi__bmp_test_raw(stbi__context *s)
function stbi__bmp_test (line 4932) | static int stbi__bmp_test(stbi__context *s)
function stbi__high_bit (line 4941) | static int stbi__high_bit(unsigned int z)
function stbi__bitcount (line 4953) | static int stbi__bitcount(unsigned int a)
function stbi__shiftsigned (line 4963) | static int stbi__shiftsigned(int v, int shift, int bits)
type stbi__bmp_data (line 4980) | typedef struct
function stbi__tga_get_comp (line 5233) | static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_r...
function stbi__tga_info (line 5249) | static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__tga_test (line 5314) | static int stbi__tga_test(stbi__context *s)
function stbi__tga_read_rgb16 (line 5346) | static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
function stbi__psd_test (line 5564) | static int stbi__psd_test(stbi__context *s)
function stbi__psd_decode_rle (line 5571) | static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelC...
function stbi__pic_is4 (line 5816) | static int stbi__pic_is4(stbi__context *s,const char *str)
function stbi__pic_test_core (line 5826) | static int stbi__pic_test_core(stbi__context *s)
type stbi__pic_packet (line 5842) | typedef struct
function stbi_uc (line 5847) | static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
function stbi__copyval (line 5861) | static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
function stbi_uc (line 5870) | static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int heigh...
function stbi__pic_test (line 6016) | static int stbi__pic_test(stbi__context *s)
type stbi__gif_lzw (line 6028) | typedef struct
type stbi__gif (line 6035) | typedef struct
function stbi__gif_test_raw (line 6052) | static int stbi__gif_test_raw(stbi__context *s)
function stbi__gif_test (line 6062) | static int stbi__gif_test(stbi__context *s)
function stbi__gif_parse_colortable (line 6069) | static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256...
function stbi__gif_header (line 6080) | static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, i...
function stbi__gif_info_raw (line 6108) | static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
function stbi__out_gif_code (line 6122) | static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
function stbi_uc (line 6156) | static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
function stbi__fill_gif_background (line 6236) | static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int ...
function stbi_uc (line 6252) | static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int ...
function stbi__gif_info (line 6392) | static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__hdr_test_core (line 6402) | static int stbi__hdr_test_core(stbi__context *s, const char *signature)
function stbi__hdr_test (line 6412) | static int stbi__hdr_test(stbi__context* s)
function stbi__hdr_convert (line 6446) | static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
function stbi__hdr_info (line 6601) | static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__bmp_info (line 6647) | static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__psd_info (line 6665) | static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__pic_info (line 6701) | static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__pnm_test (line 6773) | static int stbi__pnm_test(stbi__context *s)
function stbi__pnm_isspace (line 6811) | static int stbi__pnm_isspace(char c)
function stbi__pnm_skip_whitespace (line 6816) | static void stbi__pnm_skip_whitespace(stbi__context *s, char *c)
function stbi__pnm_isdigit (line 6830) | static int stbi__pnm_isdigit(char c)
function stbi__pnm_getinteger (line 6835) | static int stbi__pnm_getinteger(stbi__context *s, char *c)
function stbi__pnm_info (line 6847) | static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
function stbi__info_main (line 6886) | static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
function STBIDEF (line 6929) | STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
function STBIDEF (line 6939) | STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
function STBIDEF (line 6951) | STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x...
function STBIDEF (line 6958) | STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *u...
FILE: C/stb_writer.h
function STBIWDEF (line 261) | STBIWDEF void stbi_flip_vertically_on_write(int flag)
type stbi__write_context (line 266) | typedef struct
function stbi__start_write_callbacks (line 275) | static void stbi__start_write_callbacks(stbi__write_context *s, stbi_wri...
function stbi__stdio_write (line 283) | static void stbi__stdio_write(void *context, void *data, int size)
function STBIWDEF (line 297) | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen,...
function FILE (line 303) | static FILE *stbiw__fopen(char const *filename, char const *mode)
function stbi__start_write_file (line 331) | static int stbi__start_write_file(stbi__write_context *s, const char *fi...
function stbi__end_write_file (line 338) | static void stbi__end_write_file(stbi__write_context *s)
type stbiw_uint32 (line 345) | typedef unsigned int stbiw_uint32;
function stbiw__writefv (line 348) | static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_l...
function stbiw__writef (line 377) | static void stbiw__writef(stbi__write_context *s, const char *fmt, ...)
function stbiw__write_flush (line 385) | static void stbiw__write_flush(stbi__write_context *s)
function stbiw__putc (line 393) | static void stbiw__putc(stbi__write_context *s, unsigned char c)
function stbiw__write1 (line 398) | static void stbiw__write1(stbi__write_context *s, unsigned char a)
function stbiw__write3 (line 405) | static void stbiw__write3(stbi__write_context *s, unsigned char a, unsig...
function stbiw__write_pixel (line 417) | static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int ...
function stbiw__write_pixels (line 450) | static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int...
function stbiw__outfile (line 477) | static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir,...
function stbi_write_bmp_core (line 491) | static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int...
function STBIWDEF (line 500) | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context...
function STBIWDEF (line 508) | STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp...
function stbi_write_tga_core (line 520) | static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int...
function STBIWDEF (line 599) | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context...
function STBIWDEF (line 607) | STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp...
function stbiw__linear_to_rgbe (line 625) | static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
function stbiw__write_run_data (line 642) | static void stbiw__write_run_data(stbi__write_context *s, int length, un...
function stbiw__write_dump_data (line 650) | static void stbiw__write_dump_data(stbi__write_context *s, int length, u...
function stbiw__write_hdr_scanline (line 658) | static void stbiw__write_hdr_scanline(stbi__write_context *s, int width,...
function stbi_write_hdr_core (line 747) | static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int...
function STBIWDEF (line 773) | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context...
function STBIWDEF (line 781) | STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp...
function stbiw__zlib_bitrev (line 836) | static int stbiw__zlib_bitrev(int code, int codebits)
function stbiw__zlib_countm (line 846) | static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *...
function stbiw__zhash (line 854) | static unsigned int stbiw__zhash(unsigned char *data)
function stbiw__crc32 (line 994) | static unsigned int stbiw__crc32(unsigned char *buffer, int len)
function stbiw__wpcrc (line 1047) | static void stbiw__wpcrc(unsigned char **data, int len)
function stbiw__paeth (line 1053) | static unsigned char stbiw__paeth(int a, int b, int c)
function stbiw__encode_png_line (line 1062) | static void stbiw__encode_png_line(unsigned char *pixels, int stride_byt...
function STBIWDEF (line 1185) | STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp...
function STBIWDEF (line 1201) | STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context...
function stbiw__jpg_writeBits (line 1223) | static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, i...
function stbiw__jpg_DCT (line 1240) | static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3...
function stbiw__jpg_calcBits (line 1288) | static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) {
function stbiw__jpg_processDU (line 1298) | static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int...
function stbi_write_jpg_core (line 1368) | static int stbi_write_jpg_core(stbi__write_context *s, int width, int he...
function STBIWDEF (line 1577) | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context...
function STBIWDEF (line 1586) | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp...
FILE: TypeScript/src/demo.ts
function render (line 11) | function render() {
function clamp (line 24) | function clamp(n: number) {
function doEncode (line 28) | function doEncode() {
FILE: TypeScript/src/encode.ts
type NumberTriplet (line 5) | type NumberTriplet = [number, number, number];
FILE: TypeScript/src/error.ts
class ValidationError (line 1) | class ValidationError extends Error {
method constructor (line 2) | constructor(message: string) {
FILE: Website/src/sections/demo.js
function render (line 11) | function render() {
function clamp (line 27) | function clamp(n) {
function renderSelectedFile (line 31) | function renderSelectedFile() {
function renderImage (line 43) | function renderImage(img) {
function renderBlurhash (line 52) | function renderBlurhash() {
function renderSelectedImage (line 69) | function renderSelectedImage() {
FILE: Website/src/sections/hero.js
function hero (line 9) | function hero() {
FILE: Website/webpack.config.js
constant IS_DEV (line 9) | const IS_DEV = !env ? true : env;
Condensed preview — 112 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (722K chars).
[
{
"path": ".gitignore",
"chars": 325,
"preview": "## OS X specific\n.DS_Store\n\n## Various settings\n*.pbxuser\n!default.pbxuser\n*.mode1v3\n!default.mode1v3\n*.mode2v3\n!default"
},
{
"path": ".gitmodules",
"chars": 94,
"preview": "[submodule \"Python\"]\n\tpath = Python\n\turl = https://github.com/creditornot/blurhash-python.git\n"
},
{
"path": "Algorithm.md",
"chars": 3283,
"preview": "# BlurHash Algorithm\n\n## Summary\n\nBlurHash applies a simple [DCT transform](https://en.wikipedia.org/wiki/Discrete_cosin"
},
{
"path": "C/Makefile",
"chars": 337,
"preview": "PROGRAM=blurhash_encoder\nDECODER=blurhash_decoder\n$(PROGRAM): encode_stb.c encode.c encode.h stb_image.h common.h\n\t$(CC)"
},
{
"path": "C/Readme.md",
"chars": 1936,
"preview": "# BlurHash encoder in portable C\n\nThis code implements an encoder for the BlurHash algorithm in C. It can be used to int"
},
{
"path": "C/common.h",
"chars": 610,
"preview": "#ifndef __BLURHASH_COMMON_H__\n#define __BLURHASH_COMMON_H__\n\n#include<math.h>\n\n#ifndef M_PI\n#define M_PI 3.1415926535897"
},
{
"path": "C/decode.c",
"chars": 4138,
"preview": "#include \"decode.h\"\n#include \"common.h\"\n\nstatic char chars[83] = \"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqr"
},
{
"path": "C/decode.h",
"chars": 1901,
"preview": "#ifndef __BLURHASH_DECODE_H__\n\n#define __BLURHASH_DECODE_H__\n\n#include <math.h>\n#include <stdbool.h>\n#include <string.h>"
},
{
"path": "C/decode_stb.c",
"chars": 906,
"preview": "#include \"decode.h\"\n\n#define STB_IMAGE_WRITE_IMPLEMENTATION\n#include \"stb_writer.h\"\n\nint main(int argc, char **argv) {\n\t"
},
{
"path": "C/encode.c",
"chars": 3645,
"preview": "#include \"encode.h\"\n#include \"common.h\"\n\n#include <string.h>\n\nstatic float *multiplyBasisFunction(int xComponent, int yC"
},
{
"path": "C/encode.h",
"chars": 232,
"preview": "#ifndef __BLURHASH_ENCODE_H__\n#define __BLURHASH_ENCODE_H__\n\n#include <stdint.h>\n#include <stdlib.h>\n\nconst char *blurHa"
},
{
"path": "C/encode_stb.c",
"chars": 1125,
"preview": "#include \"encode.h\"\n\n#define STB_IMAGE_IMPLEMENTATION\n#include \"stb_image.h\"\n\n#include <stdio.h>\n\nconst char *blurHashFo"
},
{
"path": "C/stb_image.h",
"chars": 250035,
"preview": "/* stb_image - v2.15 - public domain image loader - http://nothings.org/stb_image.h\n "
},
{
"path": "C/stb_writer.h",
"chars": 69565,
"preview": "/* stb_image_write - v1.15 - public domain - http://nothings.org/stb\n writes out PNG/BMP/TGA/JPEG/HDR images to C stdi"
},
{
"path": "CodeOfConduct.md",
"chars": 3227,
"preview": "# Contributor Covenant Code of Conduct\n\n## Our Pledge\n\nIn the interest of fostering an open and welcoming environment, w"
},
{
"path": "Kotlin/.gitignore",
"chars": 533,
"preview": "# Built application files\n*.apk\n*.ap_\n\n# Files for the Dalvik VM\n*.dex\n\n# Java class files\n*.class\n\n# Generated files\nbi"
},
{
"path": "Kotlin/Readme.md",
"chars": 36,
"preview": "# BlurHash in Kotlin, for Android\n\n\n"
},
{
"path": "Kotlin/build.gradle",
"chars": 416,
"preview": "\nbuildscript {\n\n ext.kotlin_version = '1.3.72'\n\n repositories {\n google()\n jcenter()\n }\n\n depe"
},
{
"path": "Kotlin/demo/build.gradle",
"chars": 617,
"preview": "apply plugin: 'com.android.application'\napply plugin: 'kotlin-android'\napply plugin: 'kotlin-android-extensions'\n\nandroi"
},
{
"path": "Kotlin/demo/proguard-rules.pro",
"chars": 751,
"preview": "# Add project specific ProGuard rules here.\n# You can control the set of applied configuration files using the\n# proguar"
},
{
"path": "Kotlin/demo/src/main/AndroidManifest.xml",
"chars": 739,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\"\n pa"
},
{
"path": "Kotlin/demo/src/main/java/com/wolt/blurhashapp/MainActivity.kt",
"chars": 1011,
"preview": "package com.wolt.blurhashapp\n\nimport android.graphics.Bitmap\nimport android.os.Bundle\nimport android.os.SystemClock\nimpo"
},
{
"path": "Kotlin/demo/src/main/res/drawable/bg_blue_rounded_rect_8.xml",
"chars": 223,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<shape xmlns:android=\"http://schemas.android.com/apk/res/android\"\n android:"
},
{
"path": "Kotlin/demo/src/main/res/drawable/ic_launcher_background.xml",
"chars": 5577,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<vector\n xmlns:android=\"http://schemas.android.com/apk/res/android\"\n androi"
},
{
"path": "Kotlin/demo/src/main/res/drawable-v24/ic_launcher_foreground.xml",
"chars": 1897,
"preview": "<vector xmlns:android=\"http://schemas.android.com/apk/res/android\"\n xmlns:aapt=\"http://schemas.android.com/aapt\"\n"
},
{
"path": "Kotlin/demo/src/main/res/layout/activity_main.xml",
"chars": 1893,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<LinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\"\n xmln"
},
{
"path": "Kotlin/demo/src/main/res/mipmap-anydpi-v26/ic_launcher.xml",
"chars": 271,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<adaptive-icon xmlns:android=\"http://schemas.android.com/apk/res/android\">\n <b"
},
{
"path": "Kotlin/demo/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml",
"chars": 271,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<adaptive-icon xmlns:android=\"http://schemas.android.com/apk/res/android\">\n <b"
},
{
"path": "Kotlin/demo/src/main/res/values/colors.xml",
"chars": 209,
"preview": "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<resources>\n <color name=\"colorPrimary\">#29b6f6</color>\n <color name=\"color"
},
{
"path": "Kotlin/demo/src/main/res/values/strings.xml",
"chars": 185,
"preview": "<resources>\n <string name=\"app_name\">BlurHash</string>\n <string name=\"hint_blurhash\">BlurHash string</string>\n "
},
{
"path": "Kotlin/demo/src/main/res/values/styles.xml",
"chars": 300,
"preview": "<resources>\n\n <style name=\"AppTheme\" parent=\"Theme.AppCompat.Light.NoActionBar\">\n <item name=\"colorPrimary\">@c"
},
{
"path": "Kotlin/gradle/wrapper/gradle-wrapper.properties",
"chars": 233,
"preview": "#Mon Jul 01 10:02:38 EEST 2019\ndistributionBase=GRADLE_USER_HOME\ndistributionPath=wrapper/dists\nzipStoreBase=GRADLE_USER"
},
{
"path": "Kotlin/gradle.properties",
"chars": 779,
"preview": "# Project-wide Gradle settings.\n# IDE (e.g. Android Studio) users:\n# Gradle settings configured through the IDE *will ov"
},
{
"path": "Kotlin/gradlew",
"chars": 5296,
"preview": "#!/usr/bin/env sh\n\n##############################################################################\n##\n## Gradle start up"
},
{
"path": "Kotlin/gradlew.bat",
"chars": 2260,
"preview": "@if \"%DEBUG%\" == \"\" @echo off\r\n@rem ##########################################################################\r\n@rem\r\n@r"
},
{
"path": "Kotlin/lib/build.gradle",
"chars": 797,
"preview": "apply plugin: 'com.android.library'\napply plugin: 'kotlin-android-extensions'\napply plugin: 'kotlin-android'\n\nandroid {\n"
},
{
"path": "Kotlin/lib/proguard-rules.pro",
"chars": 751,
"preview": "# Add project specific ProGuard rules here.\n# You can control the set of applied configuration files using the\n# proguar"
},
{
"path": "Kotlin/lib/src/androidTest/java/com/wolt/blurhashkt/BlurHashDecoderTest.kt",
"chars": 3134,
"preview": "package com.wolt.blurhashkt\n\nimport android.graphics.Bitmap\nimport com.wolt.blurhashkt.BlurHashDecoder.clearCache\nimport"
},
{
"path": "Kotlin/lib/src/main/AndroidManifest.xml",
"chars": 43,
"preview": "<manifest package=\"com.wolt.blurhashkt\" />\n"
},
{
"path": "Kotlin/lib/src/main/java/com/wolt/blurhashkt/BlurHashDecoder.kt",
"chars": 6829,
"preview": "package com.wolt.blurhashkt\n\nimport android.graphics.Bitmap\nimport android.graphics.Color\nimport kotlin.math.cos\nimport "
},
{
"path": "Kotlin/settings.gradle",
"chars": 24,
"preview": "include ':demo', ':lib'\n"
},
{
"path": "License.md",
"chars": 1073,
"preview": "MIT License\n\nCopyright (c) 2018 Wolt Enterprises\n\nPermission is hereby granted, free of charge, to any person obtaining "
},
{
"path": "Readme.md",
"chars": 13142,
"preview": "# [BlurHash](http://blurha.sh)\n\nBlurHash is a compact representation of a placeholder for an image.\n\n## Why would you wa"
},
{
"path": "SECURITY.md",
"chars": 101,
"preview": "# Security Policy\n\n## Reporting a Vulnerability\n\nPlease report security issues to `security@wolt.com`"
},
{
"path": "Swift/BlurHash.xcodeproj/project.pbxproj",
"chars": 46434,
"preview": "// !$*UTF8*$!\n{\n\tarchiveVersion = 1;\n\tclasses = {\n\t};\n\tobjectVersion = 46;\n\tobjects = {\n\n/* Begin PBXBuildFile section *"
},
{
"path": "Swift/BlurHash.xcodeproj/project.xcworkspace/contents.xcworkspacedata",
"chars": 153,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Workspace\n version = \"1.0\">\n <FileRef\n location = \"self:Blurhash.xcodep"
},
{
"path": "Swift/BlurHash.xcodeproj/project.xcworkspace/xcshareddata/BlurHash.xcscmblueprint",
"chars": 1539,
"preview": "{\n \"DVTSourceControlWorkspaceBlueprintPrimaryRemoteRepositoryKey\" : \"8D94AD06B7E57997939C2DBED75F327A184CF7B8\",\n \"DVTS"
},
{
"path": "Swift/BlurHash.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist",
"chars": 238,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/P"
},
{
"path": "Swift/BlurHash.xcodeproj/xcshareddata/xcschemes/BlurHashKit.xcscheme",
"chars": 2771,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Scheme\n LastUpgradeVersion = \"1020\"\n version = \"1.3\">\n <BuildAction\n "
},
{
"path": "Swift/BlurHash.xcodeproj/xcshareddata/xcschemes/BlurHashTest.xcscheme",
"chars": 3241,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Scheme\n LastUpgradeVersion = \"1020\"\n version = \"1.3\">\n <BuildAction\n "
},
{
"path": "Swift/BlurHash.xcodeproj/xcshareddata/xcschemes/blurhash.xcscheme",
"chars": 3299,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Scheme\n LastUpgradeVersion = \"1020\"\n version = \"1.3\">\n <BuildAction\n "
},
{
"path": "Swift/BlurHash.xcodeproj/xcshareddata/xcschemes/libBlurHashKit.xcscheme",
"chars": 2871,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Scheme\n LastUpgradeVersion = \"1020\"\n version = \"1.3\">\n <BuildAction\n "
},
{
"path": "Swift/BlurHashDecode.swift",
"chars": 4949,
"preview": "import UIKit\n\nextension UIImage {\n public convenience init?(blurHash: String, size: CGSize, punch: Float = 1) {\n "
},
{
"path": "Swift/BlurHashEncode.swift",
"chars": 5046,
"preview": "import UIKit\n\nextension UIImage {\n public func blurHash(numberOfComponents components: (Int, Int)) -> String? {\n\t\tlet"
},
{
"path": "Swift/BlurHashKit/BlurHash.swift",
"chars": 2078,
"preview": "import Foundation\n\npublic struct BlurHash {\n\tpublic let components: [[(Float, Float, Float)]]\n\n\tpublic var numberOfHoriz"
},
{
"path": "Swift/BlurHashKit/ColourProbes.swift",
"chars": 4883,
"preview": "import Foundation\n\nextension BlurHash {\n public func linearRGB(atX x: Float) -> (Float, Float, Float) {\n retur"
},
{
"path": "Swift/BlurHashKit/ColourSpace.swift",
"chars": 511,
"preview": "import Foundation\n\nfunc signPow(_ value: Float, _ exp: Float) -> Float {\n\treturn copysign(pow(abs(value), exp), value)\n}"
},
{
"path": "Swift/BlurHashKit/EscapeSequences.swift",
"chars": 1547,
"preview": "import Foundation\n\nextension BlurHash {\n var twoByThreeEscapeSequence: String {\n let areas: [(from: (Float, Fl"
},
{
"path": "Swift/BlurHashKit/FromString.swift",
"chars": 2134,
"preview": "import Foundation\n\npublic extension BlurHash {\n\tinit?(string: String) {\n\t\tguard string.count >= 6 else { return nil }\n\n\t"
},
{
"path": "Swift/BlurHashKit/FromUIImage.swift",
"chars": 2388,
"preview": "import UIKit\n\npublic extension BlurHash {\n\tinit?(image: UIImage, numberOfComponents components: (Int, Int)) {\n\t\tguard co"
},
{
"path": "Swift/BlurHashKit/Generation.swift",
"chars": 3430,
"preview": "import UIKit\n\nextension BlurHash {\n\tpublic init(blendingTop top: BlurHash, bottom: BlurHash) {\n\t\tguard top.components.co"
},
{
"path": "Swift/BlurHashKit/Info.plist",
"chars": 753,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/P"
},
{
"path": "Swift/BlurHashKit/StringCoding.swift",
"chars": 934,
"preview": "import Foundation\n\nprivate let encodeCharacters: [String] = {\n return \"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghij"
},
{
"path": "Swift/BlurHashKit/ToString.swift",
"chars": 1563,
"preview": "import Foundation\n\npublic extension BlurHash {\n\tvar string: String {\n\t\tlet flatComponents = components.reduce([]) { $0 +"
},
{
"path": "Swift/BlurHashKit/ToUIImage.swift",
"chars": 3079,
"preview": "import UIKit\n\nextension BlurHash {\n\tpublic func cgImage(size: CGSize) -> CGImage? {\n\t\tlet width = Int(size.width)\n\t\tlet "
},
{
"path": "Swift/BlurHashKit/TupleMaths.swift",
"chars": 1627,
"preview": "import Foundation\n\nfunc +(lhs: (Float, Float, Float), rhs: (Float, Float, Float)) -> (Float, Float, Float) {\n\treturn (lh"
},
{
"path": "Swift/BlurHashTest/AdvancedViewController.swift",
"chars": 4149,
"preview": "import UIKit\nimport BlurHashKit\n\nclass AdvancedViewController: UIViewController {\n @IBOutlet weak var originalImageVi"
},
{
"path": "Swift/BlurHashTest/AppDelegate.swift",
"chars": 291,
"preview": "import UIKit\n\n@UIApplicationMain\nclass AppDelegate: UIResponder, UIApplicationDelegate {\n\n var window: UIWindow?\n\n "
},
{
"path": "Swift/BlurHashTest/Assets.xcassets/AppIcon.appiconset/Contents.json",
"chars": 1590,
"preview": "{\n \"images\" : [\n {\n \"idiom\" : \"iphone\",\n \"size\" : \"20x20\",\n \"scale\" : \"2x\"\n },\n {\n \"idiom\""
},
{
"path": "Swift/BlurHashTest/Base.lproj/LaunchScreen.storyboard",
"chars": 1740,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n<document type=\"com.apple.InterfaceBuilder3.CocoaTouch.Storyboard"
},
{
"path": "Swift/BlurHashTest/Base.lproj/Main.storyboard",
"chars": 111591,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<document type=\"com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB\" version=\"3"
},
{
"path": "Swift/BlurHashTest/GeneratedViewController.swift",
"chars": 5272,
"preview": "import UIKit\nimport BlurHashKit\n\nclass GeneratedViewController: UIViewController {\n @IBOutlet weak var horizontalUnco"
},
{
"path": "Swift/BlurHashTest/Info.plist",
"chars": 1442,
"preview": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/P"
},
{
"path": "Swift/BlurHashTest/SimpleViewController.swift",
"chars": 2171,
"preview": "import UIKit\n\nclass SimpleViewController: UIViewController {\n @IBOutlet weak var originalImageView: UIImageView?\n "
},
{
"path": "Swift/License.txt",
"chars": 1060,
"preview": "Copyright (c) 2018 Wolt Enterprises\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof thi"
},
{
"path": "Swift/Readme.md",
"chars": 2068,
"preview": "# BlurHash for iOS, in Swift\n\n## Standalone decoder and encoder\n\n[BlurHashDecode.swift](BlurHashDecode.swift) and [BlurH"
},
{
"path": "TypeScript/.gitignore",
"chars": 19,
"preview": "node_modules/\ndist/"
},
{
"path": "TypeScript/.npmignore",
"chars": 59,
"preview": ".DS_Store\n.prettierrc\ntsconfig.json\ndemo\nwebpack.config.js\n"
},
{
"path": "TypeScript/.prettierrc",
"chars": 102,
"preview": "{\n \"printWidth\": 80,\n \"overrides\": [\n {\n \"files\": [\"*.ts\"],\n \"options\": {}\n }\n ]\n}\n"
},
{
"path": "TypeScript/CHANGELOG.md",
"chars": 422,
"preview": "# Changelog\n\n## 2.0.0 (September 12, 2022)\n\n- Modern bundling\n- Fix DC encoding\n- Drop IE11 support\n\n## 1.1.5 (February "
},
{
"path": "TypeScript/README.md",
"chars": 2256,
"preview": "# blurhash\n\n[](https://npmjs.org/package/blurhash)\n["
},
{
"path": "TypeScript/demo/index.html",
"chars": 1660,
"preview": "<!DOCTYPE html>\n<html>\n\n<head>\n <title>Blurhash test file</title>\n <style>\n * {\n box-sizing: bor"
},
{
"path": "TypeScript/package.json",
"chars": 1394,
"preview": "{\n \"name\": \"blurhash\",\n \"version\": \"2.0.5\",\n \"description\": \"Encoder and decoder for the Wolt BlurHash algorithm.\",\n "
},
{
"path": "TypeScript/src/base83.ts",
"chars": 1097,
"preview": "const digitCharacters = [\n \"0\",\n \"1\",\n \"2\",\n \"3\",\n \"4\",\n \"5\",\n \"6\",\n \"7\",\n \"8\",\n \"9\",\n \"A\",\n \"B\",\n \"C\",\n \""
},
{
"path": "TypeScript/src/decode.ts",
"chars": 3296,
"preview": "import { decode83 } from \"./base83\";\nimport { sRGBToLinear, signPow, linearTosRGB } from \"./utils\";\nimport { ValidationE"
},
{
"path": "TypeScript/src/demo.ts",
"chars": 1992,
"preview": "import decode from \"./decode\";\nimport encode from \"./encode\";\n\nconst blurhashElement = document.getElementById(\"blurhash"
},
{
"path": "TypeScript/src/encode.ts",
"chars": 3466,
"preview": "import { encode83 } from \"./base83\";\nimport { sRGBToLinear, signPow, linearTosRGB } from \"./utils\";\nimport { ValidationE"
},
{
"path": "TypeScript/src/error.ts",
"chars": 167,
"preview": "export class ValidationError extends Error {\n constructor(message: string) {\n super(message);\n this.name = \"Valid"
},
{
"path": "TypeScript/src/index.ts",
"chars": 134,
"preview": "export { default as decode, isBlurhashValid } from \"./decode\";\nexport { default as encode } from \"./encode\";\nexport * fr"
},
{
"path": "TypeScript/src/utils.ts",
"chars": 589,
"preview": "export const sRGBToLinear = (value: number) => {\n let v = value / 255;\n if (v <= 0.04045) {\n return v / 12.92;\n } "
},
{
"path": "TypeScript/tsconfig.json",
"chars": 235,
"preview": "{\n \"compilerOptions\": {\n \"module\": \"commonjs\",\n \"target\": \"es5\",\n \"lib\": [\"es5\", \"dom\"],\n \"declaration\": tr"
},
{
"path": "TypeScript/tsup.config.ts",
"chars": 655,
"preview": "import { defineConfig } from \"tsup\";\n\nexport default defineConfig([\n {\n name: \"main\",\n entry: [\"./src/index.ts\"],"
},
{
"path": "TypeScript/webpack.config.js",
"chars": 484,
"preview": "const path = require('path');\n\nmodule.exports = {\n entry: './src/demo.ts',\n devtool: 'inline-source-map',\n module: {\n"
},
{
"path": "Website/.babelrc",
"chars": 143,
"preview": "{\n \"presets\": [\n [\n \"@babel/preset-env\",\n {\n \"targets\": \"> 0.25%, not dead\",\n \"modules\": fal"
},
{
"path": "Website/.prettierrc",
"chars": 499,
"preview": "{\n \"printWidth\": 100,\n \"overrides\": [\n {\n \"files\": [\"*.js\"],\n \"options\": {\n \"singleQuote\": true,\n "
},
{
"path": "Website/Readme.md",
"chars": 187,
"preview": "# blurha.sh\n\nWebsite for blurhash lives here.\n\n## Developing\n\n`npm start` runs the development server\n\n`npm deploy` buil"
},
{
"path": "Website/deploy.sh",
"chars": 6452,
"preview": "#!/usr/bin/env bash\nset -o errexit #abort if any command fails\nme=$(basename \"$0\")\n\nhelp_message=\"\\\nUsage: $me [-c FILE]"
},
{
"path": "Website/package.json",
"chars": 1130,
"preview": "{\n \"private\": true,\n \"name\": \"website\",\n \"version\": \"1.0.0\",\n \"description\": \"Website for BlurHash promo\",\n \"main\":"
},
{
"path": "Website/src/constants.js",
"chars": 220,
"preview": "const imageHashes = [\n 'LEHV6njZ2ykUpyoKadR*.8kCMdnj',\n 'LHF5]+c[^6#M@-5b,1J5@[or[kA{',\n 'L6Pj0^xZ.A.S_Nt7t7R+*0o}DgQ"
},
{
"path": "Website/src/index.ejs",
"chars": 7237,
"preview": "<!DOCTYPE html>\n<html lang=\"en\">\n <head>\n <meta charset=\"UTF-8\" />\n <meta\n name=\"viewport\"\n content=\"wi"
},
{
"path": "Website/src/index.js",
"chars": 112,
"preview": "import './index.scss';\n\nimport Hero from './sections/hero';\nimport Demo from './sections/demo';\n\nHero();\nDemo();"
},
{
"path": "Website/src/index.scss",
"chars": 8411,
"preview": "@import 'styles/utils.scss';\n@import 'styles/resets.scss';\n@import 'styles/variables.scss';\n@import 'styles/base.scss';\n"
},
{
"path": "Website/src/sections/demo.js",
"chars": 2682,
"preview": "import { encode, decode } from 'blurhash';\n\nconst blurhashElement = document.getElementById('demo-blurhash');\nconst canv"
},
{
"path": "Website/src/sections/hero.js",
"chars": 2480,
"preview": "import { imageHashes } from '../constants';\nimport { decode } from 'blurhash';\nimport Velocity from 'velocity-animate';\n"
},
{
"path": "Website/src/styles/averta.scss",
"chars": 9510,
"preview": "/**\n * @license\n * MyFonts Webfont Build ID 3433766, 2017-08-08T04:46:45-0400\n * \n * The fonts listed in this notice are"
},
{
"path": "Website/src/styles/base.scss",
"chars": 1450,
"preview": "html {\n height: 100%;\n @include fluid-type(font-size, 20rem, 100rem, 0.8rem, 1rem);\n}\n\nbody {\n width: 100%;\n min-hei"
},
{
"path": "Website/src/styles/resets.scss",
"chars": 4320,
"preview": "/* ----------------------------------------------------------------------------------------------------\n\nSuper Form Rese"
},
{
"path": "Website/src/styles/utils.scss",
"chars": 769,
"preview": "@mixin fluid-type($properties, $min-vw, $max-vw, $min-value, $max-value) {\n & {\n @each $property in $properties {\n "
},
{
"path": "Website/src/styles/variables.scss",
"chars": 566,
"preview": "@function rem($pixels, $context: 16px) {\n $pixels: strip-units($pixels);\n $context: strip-units($context);\n @return ("
},
{
"path": "Website/webpack.config.js",
"chars": 2055,
"preview": "const path = require('path');\nconst webpack = require('webpack');\nconst HtmlWebpackPlugin = require('html-webpack-plugin"
}
]
// ... and 2 more files (download for full content)
About this extraction
This page contains the full source code of the woltapp/blurhash GitHub repository, extracted and formatted as plain text for AI agents and large language models (LLMs). The extraction includes 112 files (667.8 KB), approximately 207.9k tokens, and a symbol index with 276 extracted functions, classes, methods, constants, and types. Use this with OpenClaw, Claude, ChatGPT, Cursor, Windsurf, or any other AI tool that accepts text input. You can copy the full output to your clipboard or download it as a .txt file.
Extracted by GitExtract — free GitHub repo to text converter for AI. Built by Nikandr Surkov.