Repository: kolesa-team/go-webp
Branch: master
Commit: bf7924d9a4e2
Files: 23
Total size: 47.2 KB

Directory structure:
gitextract_hax6w2m8/

├── .gitignore
├── .travis.yml
├── AUTHORS
├── LICENSE
├── Makefile
├── README.md
├── _examples/
│   ├── decode/
│   │   └── main.go
│   └── encode/
│       └── main.go
├── codecov.yml
├── decoder/
│   ├── decoder.go
│   ├── decoder_test.go
│   ├── options.go
│   └── options_test.go
├── encoder/
│   ├── encoder.go
│   ├── encoder_test.go
│   ├── options.go
│   └── options_test.go
├── go.mod
├── go.sum
├── utils/
│   ├── vp8.go
│   └── webp.go
└── webp/
    ├── webp.go
    └── webp_test.go

================================================
FILE CONTENTS
================================================

================================================
FILE: .gitignore
================================================
/.idea
/vendor
.DS_Store
/example/output*


================================================
FILE: .travis.yml
================================================
dist: bionic
language: go
go:
  - 1.13.x
  - 1.14.x
  - 1.15.x
  - 1.16.x
  - 1.x

script:
  - go vet ./...
  - go test -race -coverprofile=coverage.txt -covermode=atomic ./...

before_install:
  - sudo apt-get install libwebp-dev
  - go mod vendor -v

after_success:
  - bash <(curl -s https://codecov.io/bash)

addons:
  apt:
    update: true


================================================
FILE: AUTHORS
================================================
Google LLC (https://opensource.google.com/)
Amangeldy Kadyl <lex0.kz@gmail.com>


================================================
FILE: LICENSE
================================================
The MIT License (MIT)

Copyright (c) 2019 Amangeldy Kadyl

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


================================================
FILE: Makefile
================================================
.PHONY: vendor test

GO ?= $(which go)

test:
	@GO test ./... -v

vendor:
	@GO mod vendor

vet:
	@GO vet ./... -v

bench:
	@GO test -bench=. ./webp

libwebp-mac:
	brew install webp

libwebp-ubuntu:
	sudo apt-get install libwebp-dev


================================================
FILE: README.md
================================================
![logo](test_data/images/logo.jpg)
# go-webp
[![Build Status](https://api.travis-ci.com/kolesa-team/go-webp.svg?branch=master)](https://travis-ci.com/github/kolesa-team/go-webp)
[![GoDoc](https://godoc.org/github.com/kolesa-team/go-webp?status.svg)](https://godoc.org/github.com/kolesa-team/go-webp)
[![Go Report](https://goreportcard.com/badge/github.com/kolesa-team/go-webp)](https://goreportcard.com/report/github.com/kolesa-team/go-webp)
[![codecov](https://codecov.io/gh/kolesa-team/go-webp/branch/master/graph/badge.svg)](https://codecov.io/gh/kolesa-team/go-webp)

Golang Webp library for encoding and decoding, using **C** binding for Google libwebp

## Requirements
[libwebp](https://developers.google.com/speed/webp/docs/api)

## Benchmarks
```text
% go test -bench "^BenchmarkDecode" ./webp                                                                                
goos: darwin
goarch: amd64
pkg: github.com/kolesa-team/go-webp/webp
BenchmarkDecodeLossy-12                       45          25965139 ns/op
BenchmarkDecodeXImageLossy-12                 13          90735879 ns/op
BenchmarkDecodeLossless-12                    64          18887482 ns/op
BenchmarkDecodeXImageLossless-12              27          42422596 ns/op
PASS
ok      github.com/kolesa-team/go-webp/webp     7.877s
```

## Install libwebp
#### MacOS:
```bash
brew install webp
```
#### Linux:
```bash
sudo apt-get update
sudo apt-get install libwebp-dev
```

## Install
`go get -u github.com/kolesa-team/go-webp`

## Examples

#### Decode:
```go
package main

import (
	"image/jpeg"
	"log"
	"os"

	"github.com/kolesa-team/go-webp/decoder"
	"github.com/kolesa-team/go-webp/webp"
)

func main() {
	file, err := os.Open("test_data/images/m4_q75.webp")
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_decode.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer output.Close()

	img, err := webp.Decode(file, &decoder.Options{})
	if err != nil {
		log.Fatalln(err)
	}

	if err = jpeg.Encode(output, img, &jpeg.Options{Quality:75}); err != nil {
		log.Fatalln(err)
	}
}
```

```bash
go run example/decode/main.go
```

#### Encode
```go
package main

import (
	"github.com/kolesa-team/go-webp/encoder"
	"github.com/kolesa-team/go-webp/webp"
	"image/jpeg"
	"log"
	"os"
)

func main() {
	file, err := os.Open("test_data/images/source.jpg")
	if err != nil {
		log.Fatalln(err)
	}

	img, err := jpeg.Decode(file)
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_decode.webp")
	if err != nil {
		log.Fatal(err)
	}
	defer output.Close()

	options, err := encoder.NewLossyEncoderOptions(encoder.PresetDefault, 75)
	if err != nil {
		log.Fatalln(err)
	}

	if err := webp.Encode(output, img, options); err != nil {
		log.Fatalln(err)
	}
}
```
```bash
go run example/encode/main.go
```

## TODO
- return aux stats
- container api
- incremental decoding

## License
MIT licensed. See the LICENSE file for details.



================================================
FILE: _examples/decode/main.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package main

import (
	"image/jpeg"
	"log"
	"os"

	"github.com/kolesa-team/go-webp/decoder"
	"github.com/kolesa-team/go-webp/webp"
)

func main() {
	file, err := os.Open("test_data/images/m4_q75.webp")
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_decode.jpg")
	if err != nil {
		log.Fatal(err)
	}
	//noinspection GoUnhandledErrorResult
	defer output.Close()

	img, err := webp.Decode(file, &decoder.Options{})
	if err != nil {
		log.Fatalln(err)
	}

	if err = jpeg.Encode(output, img, &jpeg.Options{Quality: 75}); err != nil {
		log.Fatalln(err)
	}
}


================================================
FILE: _examples/encode/main.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package main

import (
	"github.com/kolesa-team/go-webp/encoder"
	"github.com/kolesa-team/go-webp/webp"
	"image/jpeg"
	"log"
	"os"
)

func main() {
	file, err := os.Open("test_data/images/source.jpg")
	if err != nil {
		log.Fatalln(err)
	}

	img, err := jpeg.Decode(file)
	if err != nil {
		log.Fatalln(err)
	}

	output, err := os.Create("example/output_encode.webp")
	if err != nil {
		log.Fatal(err)
	}
	//noinspection GoUnhandledErrorResult
	defer output.Close()

	options, err := encoder.NewLossyEncoderOptions(encoder.PresetDefault, 75)
	if err != nil {
		log.Fatalln(err)
	}

	if err := webp.Encode(output, img, options); err != nil {
		log.Fatalln(err)
	}
}


================================================
FILE: codecov.yml
================================================
ignore:
  - "_examples"
  - "utils"
  - "test_data"
coverage:
  status:
    project:
      default:
        target: 80%
        threshold: 1%


================================================
FILE: decoder/decoder.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package decoder

/*
#cgo linux LDFLAGS: -lwebp
#cgo darwin pkg-config: libwebp
#cgo windows LDFLAGS: -lwebp
#include <stdlib.h>
#include <webp/decode.h>
*/
import "C"
import (
	"errors"
	"fmt"
	"image"
	"io"
	"unsafe"

	"github.com/kolesa-team/go-webp/utils"
)

// Decoder stores information to decode picture
type Decoder struct {
	data    []byte
	options *Options
	config  *C.WebPDecoderConfig
	dPtr    *C.uint8_t
	sPtr    C.size_t
}

// NewDecoder return new decoder instance
func NewDecoder(r io.Reader, options *Options) (d *Decoder, err error) {
	var data []byte

	if data, err = io.ReadAll(r); err != nil {
		return nil, err
	}

	if len(data) == 0 {
		return nil, errors.New("data is empty")
	}

	if options == nil {
		options = &Options{}
	}
	d = &Decoder{data: data, options: options}

	if d.config, err = d.options.GetConfig(); err != nil {
		return nil, err
	}

	d.dPtr = (*C.uint8_t)(&d.data[0])
	d.sPtr = (C.size_t)(len(d.data))

	// получаем WebPBitstreamFeatures
	if status := d.parseFeatures(d.dPtr, d.sPtr); status != utils.Vp8StatusOk {
		return nil, errors.New(fmt.Sprintf("cannot fetch features: %s", status.String()))
	}

	return
}

// Decode picture from reader
func (d *Decoder) Decode() (image.Image, error) {
	// вписываем размеры итоговой картинки
	d.config.output.width, d.config.output.height = d.getOutputDimensions()
	// указываем что декодируем в RGBA
	d.config.output.colorspace = C.MODE_RGBA
	d.config.output.is_external_memory = 1

	img := image.NewNRGBA(image.Rectangle{Max: image.Point{
		X: int(d.config.output.width),
		Y: int(d.config.output.height),
	}})

	buff := (*C.WebPRGBABuffer)(unsafe.Pointer(&d.config.output.u[0]))
	buff.stride = C.int(img.Stride)
	buff.rgba = (*C.uint8_t)(&img.Pix[0])
	buff.size = (C.size_t)(len(img.Pix))

	if status := utils.VP8StatusCode(C.WebPDecode(d.dPtr, d.sPtr, d.config)); status != utils.Vp8StatusOk {
		return nil, errors.New(fmt.Sprintf("cannot decode picture: %s", status.String()))
	}

	return img, nil
}

// GetFeatures return information about picture: width, height ...
func (d *Decoder) GetFeatures() utils.BitstreamFeatures {
	return utils.BitstreamFeatures{
		Width:        int(d.config.input.width),
		Height:       int(d.config.input.height),
		HasAlpha:     int(d.config.input.has_alpha) == 1,
		HasAnimation: int(d.config.input.has_animation) == 1,
		Format:       utils.FormatType(d.config.input.format),
	}
}

// parse features from picture
func (d *Decoder) parseFeatures(dataPtr *C.uint8_t, sizePtr C.size_t) utils.VP8StatusCode {
	return utils.VP8StatusCode(C.WebPGetFeatures(dataPtr, sizePtr, &d.config.input))
}

// return dimensions of result image
func (d *Decoder) getOutputDimensions() (width, height C.int) {
	width = d.config.input.width
	height = d.config.input.height

	if d.config.options.use_scaling > 0 {
		width = d.config.options.scaled_width
		height = d.config.options.scaled_height
	} else if d.config.options.use_cropping > 0 {
		width = d.config.options.crop_width
		height = d.config.options.crop_height
	}

	return
}


================================================
FILE: decoder/decoder_test.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package decoder

import (
	"github.com/kolesa-team/go-webp/utils"
	"github.com/stretchr/testify/require"
	"image"
	"os"
	"testing"
)

func TestNewDecoder(t *testing.T) {
	t.Run("create success", func(t *testing.T) {
		file, err := os.Open("../test_data/images/m4_q75.webp")
		if err != nil {
			t.Fatal(err)
		}

		if d, err := NewDecoder(file, &Options{
			BypassFiltering:   true,
			NoFancyUpsampling: true,
			Scale: image.Rectangle{
				Max: image.Point{
					X: 300,
					Y: 300,
				},
			},
			UseThreads:             true,
			Flip:                   true,
			DitheringStrength:      0,
			AlphaDitheringStrength: 0,
		}); err != nil {
			t.Fatal(err)
		} else if img, err := d.Decode(); err != nil {
			t.Fatal(err)
		} else if img.Bounds().Max.X <= 0 || img.Bounds().Max.Y <= 0 {
			t.Fatal("invalid decoding result")
		}
	})
	t.Run("empty file", func(t *testing.T) {
		file, err := os.Open("../test_data/images/invalid.webp")
		if err != nil {
			t.Fatal(err)
		}

		if _, err := NewDecoder(file, &Options{
			Crop: image.Rectangle{
				Max: image.Point{
					X: 150,
					Y: 150,
				},
			},
		}); err == nil {
			t.Fatal(err)
		}
	})
}

func TestDecoder_GetFeatures(t *testing.T) {
	file, err := os.Open("../test_data/images/m4_q75.webp")
	if err != nil {
		t.Fatal(err)
	}

	dec, err := NewDecoder(file, &Options{})
	if err != nil {
		t.Fatal(err)
	}

	features := dec.GetFeatures()

	if features.Width != 675 || features.Height != 900 {
		t.Fatal("incorrect dimensions")
	}

	if features.Format != utils.FormatLossy {
		t.Fatal("file format is invalid")
	}

	if features.HasAlpha {
		t.Fatal("file has_alpha is invalid")
	}

	if features.HasAlpha {
		t.Fatal("file has_animation is invalid")
	}
}

func TestDecoder_NilOptions(t *testing.T) {
	file, err := os.Open("../test_data/images/m4_q75.webp")
	require.NoError(t, err)

	_, err = NewDecoder(file, nil)
	require.NoError(t, err)
}


================================================
FILE: decoder/options.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package decoder

/*
#cgo LDFLAGS: -lwebp
#include <webp/decode.h>
*/
import "C"
import (
	"errors"
	"image"
)

// Options specifies webp decoding parameters
type Options struct {
	BypassFiltering        bool
	NoFancyUpsampling      bool
	Crop                   image.Rectangle
	Scale                  image.Rectangle
	UseThreads             bool
	Flip                   bool
	DitheringStrength      int
	AlphaDitheringStrength int
}

// GetConfig build WebPDecoderConfig for libwebp
func (o *Options) GetConfig() (*C.WebPDecoderConfig, error) {
	config := C.WebPDecoderConfig{}

	if C.WebPInitDecoderConfig(&config) == 0 {
		return nil, errors.New("cannot init decoder config")
	}

	if o.BypassFiltering {
		config.options.bypass_filtering = 1
	}

	if o.NoFancyUpsampling {
		config.options.no_fancy_upsampling = 1
	}

	// проверяем надо ли кропнуть
	if o.Crop.Max.X > 0 && o.Crop.Max.Y > 0 {
		config.options.use_cropping = 1
		config.options.crop_left = C.int(o.Crop.Min.X)
		config.options.crop_top = C.int(o.Crop.Min.Y)
		config.options.crop_width = C.int(o.Crop.Max.X)
		config.options.crop_height = C.int(o.Crop.Max.Y)
	}

	// проверяем надо ли заскейлить
	if o.Scale.Max.X > 0 && o.Scale.Max.Y > 0 {
		config.options.use_scaling = 1
		config.options.scaled_width = C.int(o.Scale.Max.X)
		config.options.scaled_height = C.int(o.Scale.Max.Y)
	}

	if o.UseThreads {
		config.options.use_threads = 1
	}

	config.options.dithering_strength = C.int(o.DitheringStrength)

	if o.Flip {
		config.options.flip = 1
	}

	config.options.alpha_dithering_strength = C.int(o.AlphaDitheringStrength)

	return &config, nil
}


================================================
FILE: decoder/options_test.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package decoder

import (
	"image"
	"testing"
)

func TestOptions_GetConfig(t *testing.T) {
	t.Run("check crop", func(t *testing.T) {
		options := &Options{
			Crop: image.Rectangle{
				Min: image.Point{X: 100, Y: 200},
				Max: image.Point{X: 400, Y: 500},
			},
		}
		if cfg, err := options.GetConfig(); err != nil {
			t.Fatal(err)
		} else if cfg.options.use_cropping != 1 {
			t.Fatal("cropping is disabled")
		} else if cfg.options.crop_left != 100 {
			t.Fatal("crop_left is invalid")
		} else if cfg.options.crop_top != 200 {
			t.Fatal("crop_top is invalid")
		} else if cfg.options.crop_width != 400 {
			t.Fatal("crop_width is invalid")
		} else if cfg.options.crop_height != 500 {
			t.Fatal("crop_height is invalid")
		}
	})
	t.Run("check scale", func(t *testing.T) {
		options := &Options{
			Scale: image.Rectangle{
				Max: image.Point{X: 400, Y: 500},
			},
		}
		if cfg, err := options.GetConfig(); err != nil {
			t.Fatal(err)
		} else if cfg.options.use_scaling != 1 {
			t.Fatal("scaling is disabled")
		} else if cfg.options.scaled_width != 400 {
			t.Fatal("scaled_width is invalid")
		} else if cfg.options.scaled_height != 500 {
			t.Fatal("scaled_height is invalid")
		}
	})
}


================================================
FILE: encoder/encoder.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package encoder

/*

#cgo linux LDFLAGS: -lwebp
#cgo darwin pkg-config: libwebp
#cgo windows LDFLAGS: -lwebp
#include <stdlib.h>
#include <webp/encode.h>
static uint8_t* encodeNRBBA(WebPConfig* config, const uint8_t* rgba, int width, int height, int stride, size_t* output_size) {
	WebPPicture pic;
	WebPMemoryWriter wrt;
	int ok;

	if (!WebPPictureInit(&pic)) {
		return NULL;
	}

	pic.use_argb = 1;
	pic.width = width;
	pic.height = height;
	pic.writer = WebPMemoryWrite;
	pic.custom_ptr = &wrt;
	WebPMemoryWriterInit(&wrt);

	ok = WebPPictureImportRGBA(&pic, rgba, stride) && WebPEncode(config, &pic);
	WebPPictureFree(&pic);

	if (!ok) {
		WebPMemoryWriterClear(&wrt);
		return NULL;
	}

	*output_size = wrt.size;
	return wrt.mem;
}
*/
import "C"
import (
	"errors"
	"image"
	"image/draw"
	"io"
	"unsafe"
)

// Encoder stores information to encode image
type Encoder struct {
	options *Options
	config  *C.WebPConfig
	img     *image.NRGBA
}

// NewEncoder return new encoder instance
func NewEncoder(src image.Image, options *Options) (e *Encoder, err error) {
	var config *C.WebPConfig

	if options == nil {
		options, _ = NewLossyEncoderOptions(PresetDefault, 75)
	}
	if config, err = options.GetConfig(); err != nil {
		return nil, err
	}

	e = &Encoder{options: options, config: config}

	switch v := src.(type) {
	case *image.NRGBA:
		e.img = v
	default:
		e.img = e.convertToNRGBA(src)
	}

	return
}

// Encode picture and flush to io.Writer
func (e *Encoder) Encode(w io.Writer) error {
	var size C.size_t

	output := C.encodeNRBBA(
		e.config,
		(*C.uint8_t)(&e.img.Pix[0]),
		C.int(e.img.Rect.Dx()),
		C.int(e.img.Rect.Dy()),
		C.int(e.img.Stride),
		&size,
	)

	if output == nil || size == 0 {
		return errors.New("cannot encode webppicture")
	}
	defer C.free(unsafe.Pointer(output))

	_, err := w.Write(((*[1 << 30]byte)(unsafe.Pointer(output)))[0:int(size):int(size)])

	return err
}

// Convert picture from any image.Image type to *image.NRGBA
// @todo optimization needed
func (e *Encoder) convertToNRGBA(src image.Image) (dst *image.NRGBA) {
	dst = image.NewNRGBA(src.Bounds())
	draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)

	return
}


================================================
FILE: encoder/encoder_test.go
================================================
package encoder

import (
	"bytes"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"image"
	"os"
	"testing"
)

func TestNewEncoder(t *testing.T) {
	t.Run("encode nrgba image with lossy preset", func(t *testing.T) {
		expected := &bytes.Buffer{}
		img := image.NewNRGBA(image.Rectangle{
			Max: image.Point{
				X: 100,
				Y: 150,
			},
		})

		options, err := NewLossyEncoderOptions(PresetDefault, 0.75)
		require.NoError(t, err)

		e, err := NewEncoder(img, options)
		require.NoError(t, err)

		err = e.Encode(expected)
		require.NoError(t, err)

		actual, err := os.ReadFile("../test_data/images/100x150_lossy.webp")
		require.NoError(t, err)

		assert.Equal(t, actual, expected.Bytes())
	})
	t.Run("encode nrgba image with lossless preset", func(t *testing.T) {
		actuall := &bytes.Buffer{}
		img := image.NewNRGBA(image.Rectangle{
			Max: image.Point{
				X: 100,
				Y: 150,
			},
		})

		options, err := NewLosslessEncoderOptions(PresetDefault, 1)
		require.NoError(t, err)

		e, err := NewEncoder(img, options)
		require.NoError(t, err)

		err = e.Encode(actuall)
		require.NoError(t, err)

		expected, err := os.ReadFile("../test_data/images/100x150_lossless.webp")
		require.NoError(t, err)

		assert.Equal(t, expected, actuall.Bytes())
	})
}

func TestNewEncoder_NilOptions(t *testing.T) {
	t.Run("encode image without passing options should not panic", func(t *testing.T) {
		expected := &bytes.Buffer{}
		img := image.NewNRGBA(image.Rectangle{
			Max: image.Point{
				X: 100,
				Y: 150,
			},
		})

		e, err := NewEncoder(img, nil)
		require.NoError(t, err)

		err = e.Encode(expected)
		require.NoError(t, err)
	})
}


================================================
FILE: encoder/options.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package encoder

/*
#cgo LDFLAGS: -lwebp
#include <webp/encode.h>
*/
import "C"
import (
	"errors"
	"fmt"
)

// Default libwebp image hints
//noinspection GoUnusedConst
const (
	HintDefault ImageHint = iota
	HintPicture
	HintPhoto
	HintGraph
	HintLast
)

// Default libwebp presets
//noinspection GoUnusedConst
const (
	PresetDefault EncodingPreset = iota
	PresetPicture
	PresetPhoto
	PresetDrawing
	PresetIcon
	PresetText
)

type (
	// ImageHint hint of picture
	ImageHint int
	// EncodingPreset using Preset
	EncodingPreset int
	// Options specifies webp encoding parameters
	Options struct {
		config *C.WebPConfig

		Lossless         bool
		Quality          float32
		Method           int
		ImageHint        ImageHint
		TargetSize       int
		TargetPsnr       float32
		Segments         int
		SnsStrength      int
		FilterStrength   int
		FilterSharpness  int
		FilterType       int
		Autofilter       bool
		AlphaCompression int
		AlphaFiltering   int
		alphaQuality     int
		Pass             int
		// Disabled for compatibility with old version libwebp
		// QMin             int
		// QMax             int
		ShowCompressed  bool
		Preprocessing   int
		Partitions      int
		PartitionLimit  int
		EmulateJpegSize bool
		ThreadLevel     bool
		LowMemory       bool
		NearLossless    int
		Exact           int
		UseDeltaPalette bool
		UseSharpYuv     bool
	}
)

// NewLossyEncoderOptions build lossy encoding options
func NewLossyEncoderOptions(preset EncodingPreset, quality float32) (options *Options, err error) {
	options = &Options{
		config: &C.WebPConfig{},
	}

	if C.WebPConfigPreset(options.config, C.WebPPreset(preset), C.float(quality)) == 0 {
		return nil, errors.New("cannot init encoder config")
	}

	options.sync()

	return
}

// NewLosslessEncoderOptions build lossless encoding options
func NewLosslessEncoderOptions(preset EncodingPreset, level int) (options *Options, err error) {
	if options, err = NewLossyEncoderOptions(preset, 0); err != nil {
		return
	}
	if C.WebPConfigLosslessPreset(options.config, C.int(level)) == 0 {
		return nil, errors.New("cannot init lossless preset")
	}

	options.sync()

	return
}

func (o *Options) sync() {
	o.Lossless = o.config.lossless == 1
	o.Quality = float32(o.config.quality)
	o.Method = int(o.config.method)
	o.ImageHint = ImageHint(o.config.image_hint)
	o.TargetSize = int(o.config.target_size)
	o.TargetPsnr = float32(o.config.target_PSNR)
	o.Segments = int(o.config.segments)
	o.SnsStrength = int(o.config.sns_strength)
	o.FilterStrength = int(o.config.filter_strength)
	o.FilterSharpness = int(o.config.filter_sharpness)
	o.FilterType = int(o.config.filter_type)
	o.Autofilter = o.config.autofilter == 1
	o.AlphaCompression = int(o.config.alpha_compression)
	o.AlphaFiltering = int(o.config.alpha_filtering)
	o.alphaQuality = int(o.config.alpha_quality)
	o.Pass = int(o.config.pass)
	// Disabled for compatibility with old version libwebp
	// o.QMin = int(o.config.qmin)
	// o.QMax = int(o.config.qmax)
	o.ShowCompressed = o.config.show_compressed == 1
	o.Preprocessing = int(o.config.preprocessing)
	o.Partitions = int(o.config.partitions)
	o.PartitionLimit = int(o.config.partition_limit)
	o.EmulateJpegSize = o.config.emulate_jpeg_size == 1
	o.ThreadLevel = o.config.thread_level == 1
	o.LowMemory = o.config.low_memory == 1
	o.NearLossless = int(o.config.near_lossless)
	o.Exact = int(o.config.exact)
	o.UseDeltaPalette = o.config.use_delta_palette == 1
	o.UseSharpYuv = o.config.use_sharp_yuv == 1
}

func (o *Options) boolToCInt(expression bool) (result C.int) {
	result = 0

	if expression {
		result = 1
	}

	return
}

// GetConfig build WebPConfig for libwebp
func (o *Options) GetConfig() (*C.WebPConfig, error) {
	var err error
	if o == nil {
		o, err = NewLosslessEncoderOptions(PresetDefault, 0)
		if err != nil {
			return nil, fmt.Errorf("cannot validate default config: [%w]", err)
		}
	}
	o.config.lossless = o.boolToCInt(o.Lossless)
	o.config.quality = C.float(o.Quality)
	o.config.method = C.int(o.Method)
	o.config.image_hint = C.WebPImageHint(o.ImageHint)
	o.config.target_size = C.int(o.TargetSize)
	o.config.target_PSNR = C.float(o.TargetPsnr)
	o.config.segments = C.int(o.Segments)
	o.config.sns_strength = C.int(o.SnsStrength)
	o.config.filter_strength = C.int(o.FilterStrength)
	o.config.filter_sharpness = C.int(o.FilterSharpness)
	o.config.filter_type = C.int(o.FilterType)
	o.config.autofilter = o.boolToCInt(o.Autofilter)
	o.config.alpha_compression = C.int(o.AlphaCompression)
	o.config.alpha_filtering = C.int(o.AlphaFiltering)
	o.config.alpha_quality = C.int(o.alphaQuality)
	o.config.pass = C.int(o.Pass)
	// Disabled for compatibility with old version libwebp
	// o.config.qmin = C.int(o.QMin)
	// o.config.qmax = C.int(o.QMax)
	o.config.show_compressed = o.boolToCInt(o.ShowCompressed)
	o.config.preprocessing = C.int(o.Preprocessing)
	o.config.partitions = C.int(o.Partitions)
	o.config.partition_limit = C.int(o.PartitionLimit)
	o.config.emulate_jpeg_size = o.boolToCInt(o.EmulateJpegSize)
	o.config.thread_level = o.boolToCInt(o.ThreadLevel)
	o.config.low_memory = o.boolToCInt(o.LowMemory)
	o.config.near_lossless = C.int(o.NearLossless)
	o.config.exact = C.int(o.Exact)
	o.config.use_delta_palette = o.boolToCInt(o.UseDeltaPalette)
	o.config.use_sharp_yuv = o.boolToCInt(o.UseSharpYuv)

	if C.WebPValidateConfig(o.config) == 0 {
		return nil, errors.New("cannot validate config")
	}

	return o.config, nil
}


================================================
FILE: encoder/options_test.go
================================================
package encoder

import (
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"testing"
)

func TestNilOptions(t *testing.T) {
	t.Run("config from nil Options succeeds", func(t *testing.T) {
		var options *Options = nil
		cfg, err := options.GetConfig()
		require.NoError(t, err)
		require.NotNil(t, cfg)
	})
}

func TestNewLossyEncoderOptions(t *testing.T) {
	t.Run("invalid quality", func(t *testing.T) {
		options, err := NewLossyEncoderOptions(PresetDefault, -1)
		require.Error(t, err)
		assert.Nil(t, options)
	})
	t.Run("create lossy encoder options is success", func(t *testing.T) {
		options, err := NewLossyEncoderOptions(PresetDefault, 75)
		require.Nil(t, err)
		require.NotNil(t, options)

		assert.False(t, options.Lossless)
		assert.Equal(t, float32(75), options.Quality)

		cfg, err := options.GetConfig()
		require.NoError(t, err)
		assert.NotNil(t, cfg)
	})
}

func TestNewLosslessEncoderOptions(t *testing.T) {
	t.Run("invalid level of lossless encoder", func(t *testing.T) {
		options, err := NewLosslessEncoderOptions(PresetDefault, -1)
		require.Error(t, err)
		assert.Nil(t, options)
	})
	t.Run("create lossless encoder options is success", func(t *testing.T) {
		options, err := NewLosslessEncoderOptions(PresetDefault, 1)
		require.Nil(t, err)
		require.NotNil(t, options)

		assert.True(t, options.Lossless)
		assert.Equal(t, 1, options.Method)
		assert.Equal(t, float32(20), options.Quality)

		cfg, err := options.GetConfig()
		require.NoError(t, err)
		assert.NotNil(t, cfg)
	})
}


================================================
FILE: go.mod
================================================
module github.com/kolesa-team/go-webp

go 1.10

require github.com/stretchr/testify v1.7.0


================================================
FILE: go.sum
================================================
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=


================================================
FILE: utils/vp8.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package utils

//noinspection GoUnusedConst
const (
	Vp8StatusOk VP8StatusCode = iota
	Vp8StatusOutOfMemory
	Vp8StatusInvalidParam
	Vp8StatusBitstreamError
	Vp8StatusUnsupportedFeature
	Vp8StatusSuspended
	Vp8StatusUserAbort
	Vp8StatusNotEnoughData
)

type VP8StatusCode int

func (c VP8StatusCode) String() (label string) {
	switch c {
	case Vp8StatusOk:
		label = "VP8_STATUS_OK"
	case Vp8StatusOutOfMemory:
		label = "VP8_STATUS_OUT_OF_MEMORY"
	case Vp8StatusInvalidParam:
		label = "VP8_STATUS_INVALID_PARAM"
	case Vp8StatusBitstreamError:
		label = "VP8_STATUS_BITSTREAM_ERROR"
	case Vp8StatusUnsupportedFeature:
		label = "VP8_STATUS_UNSUPPORTED_FEATURE"
	case Vp8StatusSuspended:
		label = "VP8_STATUS_SUSPENDED"
	case Vp8StatusUserAbort:
		label = "VP8_STATUS_USER_ABORT"
	case Vp8StatusNotEnoughData:
		label = "VP8_STATUS_NOT_ENOUGH_DATA"
	default:
		label = "VP8 undefined status code"
	}

	return
}

const (
	Vp8EncOk Vp8EncStatus = iota
	Vp8EncErrorOutOfMemory
	Vp8EncErrorBitstreamOutOfMemory
	Vp8EncErrorNullParameter
	Vp8EncErrorInvalidConfiguration
	Vp8EncErrorBadDimension
	Vp8EncErrorPartition0Overflow
	Vp8EncErrorPartitionOverflow
	Vp8EncErrorBadWrite
	Vp8EncErrorFileTooBig
	Vp8EncErrorUserAbort
	Vp8EncErrorLast
)

type Vp8EncStatus int

func (c Vp8EncStatus) String() (label string) {
	switch c {
	case Vp8EncOk:
		label = "VP8_ENC_OK"
	case Vp8EncErrorOutOfMemory:
		label = "VP8_ENC_ERROR_OUT_OF_MEMORY"
	case Vp8EncErrorBitstreamOutOfMemory:
		label = "VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY"
	case Vp8EncErrorNullParameter:
		label = "VP8_ENC_ERROR_NULL_PARAMETER"
	case Vp8EncErrorInvalidConfiguration:
		label = "VP8_ENC_ERROR_INVALID_CONFIGURATION"
	case Vp8EncErrorBadDimension:
		label = "VP8_ENC_ERROR_BAD_DIMENSION"
	case Vp8EncErrorPartition0Overflow:
		label = "VP8_ENC_ERROR_PARTITION0_OVERFLOW"
	case Vp8EncErrorPartitionOverflow:
		label = "VP8_ENC_ERROR_PARTITION_OVERFLOW"
	case Vp8EncErrorBadWrite:
		label = "VP8_ENC_ERROR_BAD_WRITE"
	case Vp8EncErrorFileTooBig:
		label = "VP8_ENC_ERROR_FILE_TOO_BIG"
	case Vp8EncErrorUserAbort:
		label = "VP8_ENC_ERROR_USER_ABORT"
	case Vp8EncErrorLast:
		label = "VP8_ENC_ERROR_LAST"
	default:
		label = "VP8 undefined status code"
	}

	return
}


================================================
FILE: utils/webp.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package utils

type FormatType int

//noinspection GoUnusedConst
const (
	FormatUndefined FormatType = iota
	FormatLossy
	FormatLossless
)

type BitstreamFeatures struct {
	Width        int
	Height       int
	HasAlpha     bool
	HasAnimation bool
	Format       FormatType
}


================================================
FILE: webp/webp.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package webp

import (
	"github.com/kolesa-team/go-webp/decoder"
	"github.com/kolesa-team/go-webp/encoder"
	"image"
	"image/color"
	"io"
)

func init() {
	image.RegisterFormat("webp", "RIFF????WEBPVP8", quickDecode, quickDecodeConfig)
}

func quickDecode(r io.Reader) (image.Image, error) {
	return Decode(r, &decoder.Options{})
}

func quickDecodeConfig(r io.Reader) (image.Config, error) {
	return DecodeConfig(r, &decoder.Options{})
}

// Decode picture from reader
func Decode(r io.Reader, options *decoder.Options) (image.Image, error) {
	if dec, err := decoder.NewDecoder(r, options); err != nil {
		return nil, err
	} else {
		return dec.Decode()
	}
}

func DecodeConfig(r io.Reader, options *decoder.Options) (image.Config, error) {
	if dec, err := decoder.NewDecoder(r, options); err != nil {
		return image.Config{}, err
	} else {
		return image.Config{
			ColorModel: color.RGBAModel,
			Width:      dec.GetFeatures().Width,
			Height:     dec.GetFeatures().Height,
		}, nil
	}
}

// Encode picture and write to io.Writer
func Encode(w io.Writer, src image.Image, options *encoder.Options) error {
	if enc, err := encoder.NewEncoder(src, options); err != nil {
		return err
	} else {
		return enc.Encode(w)
	}
}


================================================
FILE: webp/webp_test.go
================================================
// The MIT License (MIT)
//
// Copyright (c) 2019 Amangeldy Kadyl
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package webp

import (
	"bytes"
	"github.com/kolesa-team/go-webp/decoder"
	"github.com/kolesa-team/go-webp/encoder"
	"github.com/stretchr/testify/require"
	"image"
	"image/color"
	"image/jpeg"
	"io"
	"os"
	"testing"
)

func TestEncode(t *testing.T) {
	t.Run("encode lossy", func(t *testing.T) {
		r, err := os.Open("../test_data/images/source.jpg")
		if err != nil {
			t.Fatal(err)
		}

		img, err := jpeg.Decode(r)
		if err != nil {
			t.Fatal(err)
		}

		options, err := encoder.NewLossyEncoderOptions(encoder.PresetDefault, 75)
		if err != nil {
			t.Fatal(err)
		}

		if err = Encode(io.Discard, img, options); err != nil {
			t.Fatal(err)
		}
	})
	t.Run("encode lossless", func(t *testing.T) {
		r, err := os.Open("../test_data/images/source.jpg")
		if err != nil {
			t.Fatal(err)
		}

		img, err := jpeg.Decode(r)
		if err != nil {
			t.Fatal(err)
		}

		options, err := encoder.NewLosslessEncoderOptions(encoder.PresetDefault, 4)
		if err != nil {
			t.Fatal(err)
		}

		if err = Encode(io.Discard, img, options); err != nil {
			t.Fatal(err)
		}
	})
	t.Run("failed encoding with large size", func(t *testing.T) {
		img := image.NewNRGBA(image.Rectangle{
			Max: image.Point{X: 20000, Y: 1},
		})

		options, err := encoder.NewLosslessEncoderOptions(encoder.PresetDefault, 4)
		if err != nil {
			t.Fatal(err)
		}

		if err = Encode(io.Discard, img, options); err == nil {
			t.Fatal("an error was expected")
		}
	})
}

func TestDecode(t *testing.T) {
	t.Run("decode lossy webp picture with many options", func(t *testing.T) {
		r, err := os.Open("../test_data/images/webp-logo-lossy.webp")
		if err != nil {
			t.Fatal(err)
		}

		if img, err := Decode(r, &decoder.Options{
			BypassFiltering:   true,
			NoFancyUpsampling: true,

			Crop: image.Rectangle{},
			Scale: image.Rectangle{
				Max: image.Point{
					X: 400,
					Y: 300,
				},
			},

			UseThreads:             true,
			Flip:                   true,
			DitheringStrength:      1,
			AlphaDitheringStrength: 1,
		}); err != nil {
			t.Fatal(err)
		} else if img == nil {
			t.Fatal("img is empty")
		} else if img.Bounds().Max.X != 400 || img.Bounds().Max.Y != 300 {
			t.Fatal("img is invalid")
		}
	})
	t.Run("decode lossless webp picture", func(t *testing.T) {
		r, err := os.Open("../test_data/images/webp-logo-lossless.webp")
		if err != nil {
			t.Fatal(err)
		}

		if img, err := Decode(r, &decoder.Options{}); err != nil {
			t.Fatal(err)
		} else if img == nil {
			t.Fatal("img is empty")
		}
	})
	t.Run("decode invalid webp file", func(t *testing.T) {
		r, err := os.Open("../test_data/images/invalid.webp")
		if err != nil {
			t.Fatal(err)
		}

		if _, err := Decode(r, &decoder.Options{}); err == nil {
			t.Fatal("an error was expected")
		}
	})
	t.Run("decode lossy image via standard image.Decode", func(t *testing.T) {
		r, err := os.Open("../test_data/images/webp-logo-lossy.webp")
		require.NoError(t, err)
		img, format, err := image.Decode(r)
		require.NoError(t, err)

		require.Equal(t, "webp", format)
		require.Equal(t, color.NRGBAModel, img.ColorModel())
	})
	t.Run("decode lossless image via standard image.Decode", func(t *testing.T) {
		r, err := os.Open("../test_data/images/webp-logo-lossless.webp")
		require.NoError(t, err)
		img, format, err := image.Decode(r)
		require.NoError(t, err)

		require.Equal(t, "webp", format)
		require.Equal(t, color.NRGBAModel, img.ColorModel())
	})
}

func BenchmarkDecodeLossy(b *testing.B) {
	data, err := os.ReadFile("../test_data/images/webp-logo-lossy.webp")
	if err != nil {
		b.Fatal(err)
	}

	for i := 0; i < b.N; i++ {
		dec, err := decoder.NewDecoder(bytes.NewBuffer(data), &decoder.Options{})
		if err != nil {
			b.Fatal(err)
		}

		if _, err := dec.Decode(); err != nil {
			b.Fatal(err)
		}
	}
}

func BenchmarkDecodeXImageLossy(b *testing.B) {
	data, err := os.ReadFile("../test_data/images/webp-logo-lossy.webp")
	if err != nil {
		b.Fatal(err)
	}

	for i := 0; i < b.N; i++ {
		_, err = Decode(bytes.NewBuffer(data), &decoder.Options{})
		if err != nil {
			b.Fatal(err)
		}
	}
}

func BenchmarkDecodeLossless(b *testing.B) {
	data, err := os.ReadFile("../test_data/images/webp-logo-lossless.webp")
	if err != nil {
		b.Fatal(err)
	}

	for i := 0; i < b.N; i++ {
		dec, err := decoder.NewDecoder(bytes.NewBuffer(data), &decoder.Options{})
		if err != nil {
			b.Fatal(err)
		}

		if _, err := dec.Decode(); err != nil {
			b.Fatal(err)
		}
	}
}

func BenchmarkDecodeXImageLossless(b *testing.B) {
	data, err := os.ReadFile("../test_data/images/webp-logo-lossless.webp")
	if err != nil {
		b.Fatal(err)
	}

	for i := 0; i < b.N; i++ {
		_, err = Decode(bytes.NewBuffer(data), &decoder.Options{})
		if err != nil {
			b.Fatal(err)
		}
	}
}

func BenchmarkEncode(b *testing.B) {
	r, err := os.Open("../test_data/images/source.jpg")
	if err != nil {
		b.Fatal(err)
	}

	img, err := jpeg.Decode(r)
	if err != nil {
		b.Fatal(err)
	}

	for i := 0; i < b.N; i++ {
		options, err := encoder.NewLossyEncoderOptions(encoder.PresetDefault, 75)
		if err != nil {
			b.Fatal(err)
		}

		if err = Encode(io.Discard, img, options); err != nil {
			b.Fatal(err)
		}
	}
}