webp

package module
v1.6.2 Latest Latest
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 Go to latest Published: Feb 5, 2026 License: BSD-3-Clause Imports: 11 Imported by: 0

README

webp

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Build Status GoDoc GitHub release license

Benchmark

Install

Install GCC or MinGW (download here) at first, and then run these commands:

  1. go get github.com/coalaura/webp
  2. go run hello.go

Example

This is a simple example:

package main

import (
	"bytes"
	"fmt"
	"log"
	"os"

	"github.com/coalaura/webp"
)

func main() {
	var buf bytes.Buffer
	var width, height int
	var data []byte
	var err error

	// Load file data
	if data, err = os.ReadFile("./testdata/1_webp_ll.webp"); err != nil {
		log.Println(err)
	}

	// GetInfo
	if width, height, _, err = webp.GetInfo(data); err != nil {
		log.Println(err)
	}
	fmt.Printf("width = %d, height = %d\n", width, height)

	// GetMetadata
	if metadata, err := webp.GetMetadata(data, "ICCP"); err != nil {
		fmt.Printf("Metadata: err = %v\n", err)
	} else {
		fmt.Printf("Metadata: %s\n", string(metadata))
	}

	// Decode webp
	m, err := webp.Decode(bytes.NewReader(data))
	if err != nil {
		log.Println(err)
	}

	// Encode lossless webp
	if err = webp.Encode(&buf, m, &webp.Options{Lossless: true}); err != nil {
		log.Println(err)
	}
	if err = os.WriteFile("output.webp", buf.Bytes(), 0666); err != nil {
		log.Println(err)
	}
    
    fmt.Println("Save output.webp ok")
}

Decode and Encode as RGB format:

m, err := webp.DecodeRGB(data)
if err != nil {
	log.Fatal(err)
}

data, err := webp.EncodeRGB(m)
if err != nil {
	log.Fatal(err)
}

Documentation

Overview

Package webp implements a decoder and encoder for WEBP images.

WEBP is defined at: https://developers.google.com/speed/webp/docs/riff_container

Install

Install `GCC` or `MinGW` (http://tdm-gcc.tdragon.net/download) at first, and then run these commands:

  1. `go get github.com/coalaura/webp`
  2. `go run hello.go`

Examples

This is a simple example: 

package main

import (
	"bytes"
	"fmt"
	"os"
	"log"

	"github.com/coalaura/webp"
)

func main() {
	var buf bytes.Buffer
	var width, height int
	var data []byte
	var err error

	// Load file data
	if data, err = os.ReadFile("./testdata/1_webp_ll.webp"); err != nil {
		log.Fatal(err)
	}

	// GetInfo
	if width, height, _, err = webp.GetInfo(data); err != nil {
		log.Fatal(err)
	}
	fmt.Printf("width = %d, height = %d\n", width, height)

	// GetMetadata
	if metadata, err := webp.GetMetadata(data, "ICCP"); err != nil {
		fmt.Printf("Metadata: err = %v\n", err)
	} else {
		fmt.Printf("Metadata: %s\n", string(metadata))
	}

	// Decode webp
	m, err := webp.Decode(bytes.NewReader(data))
	if err != nil {
		log.Fatal(err)
	}

	// Encode lossless webp
	if err = webp.Encode(&buf, m, &webp.Options{Lossless: true}); err != nil {
		log.Fatal(err)
	}
	if err = os.WriteFile("output.webp", buf.Bytes(), 0666); err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Save output.webp ok\n")
}

Decode and Encode as RGB format: 

m, err := webp.DecodeRGB(data)
if err != nil {
	log.Fatal(err)
}

data, err := webp.EncodeRGB(m, 90.0, 0)
if err != nil {
	log.Fatal(err)
}

BUGS

Report bugs to <chaishushan@gmail.com>.

Thanks!

Index

Examples

Constants

View Source 
const DefaultAlphaQuality = 100
View Source 
const DefaultMethod = 4
View Source 
const DefaultQuality = 90
View Source 
const (
	MemPMagic = "MemP" // See https://github.com/chai2010/image
)
View Source 
const (
	WEBP_DECODER_ABI_VERSION = 0x0210 // MAJOR(8b) + MINOR(8b)
)

Variables

This section is empty.

Functions

func C_webpFree 

func C_webpFree(p unsafe.Pointer)

func C_webpMalloc 

func C_webpMalloc(size C_size_t) unsafe.Pointer

func ChannelsOf 

func ChannelsOf(m image.Image) int

func ColorModel 

func ColorModel(channels int, dataType reflect.Kind) color.Model
Example 
rgba := color.RGBA{R: 101, G: 102, B: 103, A: 104}
c := ColorModel(4, reflect.Uint8).Convert(rgba).(MemPColor)
fmt.Printf("c = %v\n", c)

Output:

c = {4 uint8 [101 102 103 104]}

func Decode 

func Decode(r io.Reader) (m image.Image, err error)

Decode reads a WEBP image from r and returns it as an image.Image.

func DecodeConfig 

func DecodeConfig(r io.Reader) (config image.Config, err error)

DecodeConfig returns the color model and dimensions of a WEBP image without decoding the entire image.

func DecodeGray 

func DecodeGray(data []byte) (m *image.Gray, err error)

func DecodeGrayToSize 

func DecodeGrayToSize(data []byte, width, height int) (m *image.Gray, err error)

DecodeGrayToSize decodes a Gray image scaled to the given dimensions. For large images, the DecodeXXXToSize methods are significantly faster and require less memory compared to decoding a full-size image and then resizing it.

func DecodeRGBA 

func DecodeRGBA(data []byte) (m *image.RGBA, err error)

func DecodeRGBAToSize 

func DecodeRGBAToSize(data []byte, width, height int) (m *image.RGBA, err error)

DecodeRGBAToSize decodes a Gray image scaled to the given dimensions.

func DepthOf 

func DepthOf(m image.Image) int

func Encode 

func Encode(w io.Writer, m image.Image, opt *Options) (err error)

Encode writes the image m to w in WEBP format.

Example 
m, err := Load("./testdata/1_webp_ll.webp")
if err != nil {
	log.Fatal(err)
}

var buf bytes.Buffer
if err := Encode(&buf, m, nil); err != nil {
	log.Fatal(err)
}
_ = buf.Bytes()
Example (Lossless) 
m, err := Load("./testdata/1_webp_ll.webp")
if err != nil {
	log.Fatal(err)
}

var buf bytes.Buffer
if err := Encode(&buf, m, &Options{Lossless: true}); err != nil {
	log.Fatal(err)
}
_ = buf.Bytes()
Example (Rgb) 
rgb := NewRGBImage(image.Rect(0, 0, 400, 300))

var buf bytes.Buffer
if err := Encode(&buf, rgb, nil); err != nil {
	log.Fatal(err)
}
_ = buf.Bytes()
Example (Rgb48MemP) 
rgb48 := NewMemPImage(image.Rect(0, 0, 400, 300), 3, reflect.Uint16)

var buf bytes.Buffer
if err := Encode(&buf, rgb48, nil); err != nil {
	log.Fatal(err)
}
_ = buf.Bytes()

func EncodeAll added in v1.6.2 

func EncodeAll(w io.Writer, anim *Animation, opt *Options) error

EncodeAll writes all frames in anim to w as an animated WEBP. Delay values are in milliseconds.

func EncodeExactLosslessRGBA 

func EncodeExactLosslessRGBA(m image.Image, method int) (data []byte, err error)

EncodeExactLosslessRGBA Encode lossless RGB mode with exact. exact: preserve RGB values in transparent area.

func EncodeGray 

func EncodeGray(m image.Image, quality float32, method int) (data []byte, err error)

func EncodeLosslessGray 

func EncodeLosslessGray(m image.Image, method int) (data []byte, err error)

func EncodeLosslessRGB 

func EncodeLosslessRGB(m image.Image, method int) (data []byte, err error)

func EncodeLosslessRGBA 

func EncodeLosslessRGBA(m image.Image, method int) (data []byte, err error)

func EncodeRGB 

func EncodeRGB(m image.Image, quality float32, method int) (data []byte, err error)

func EncodeRGBA 

func EncodeRGBA(m image.Image, quality float32, method int) (data []byte, err error)

func GetInfo 

func GetInfo(data []byte) (width, height int, hasAlpha bool, hasAnimation bool, format int, err error)
Example 
data := xLoadData("1_webp_a.webp")

width, height, hasAlpha, hasAnimation, format, err := GetInfo(data)
if err != nil {
	log.Fatal(err)
}

fmt.Printf("width: %v\n", width)
fmt.Printf("height: %v\n", height)
fmt.Printf("hasAlpha: %v\n", hasAlpha)
fmt.Printf("hasAnimation: %v\n", hasAnimation)
fmt.Printf("format: %v\n", format)

Output:

width: 400
height: 301
hasAlpha: true
hasAnimation: false
format: 0
Example (NoAlpha) 
data := xLoadData("video-001.webp")

width, height, hasAlpha, hasAnimation, format, err := GetInfo(data)
if err != nil {
	log.Fatal(err)
}

fmt.Printf("width: %v\n", width)
fmt.Printf("height: %v\n", height)
fmt.Printf("hasAlpha: %v\n", hasAlpha)
fmt.Printf("hasAnimation: %v\n", hasAnimation)
fmt.Printf("format: %v\n", format)

Output:

width: 150
height: 103
hasAlpha: false
hasAnimation: false
format: 1

func GetMetadata 

func GetMetadata(data []byte, format string) (metadata []byte, err error)

GetMetadata return EXIF/ICCP/XMP format metadata.

func Load 

func Load(name string) (m image.Image, err error)
Example 
m, err := Load("./testdata/1_webp_ll.webp")
if err != nil {
	log.Fatal(err)
}
fmt.Printf("Bounds = %v\n", m.Bounds())

Output:

Bounds = (0,0)-(400,301)

func LoadConfig 

func LoadConfig(name string) (config image.Config, err error)
Example 
cfg, err := LoadConfig("./testdata/1_webp_ll.webp")
if err != nil {
	log.Fatal(err)
}
fmt.Printf("Width = %d\n", cfg.Width)
fmt.Printf("Height = %d\n", cfg.Height)

Output:

Width = 400
Height = 301

func Save 

func Save(name string, m image.Image, opt *Options) (err error)
Example 
tmpname := "z_test_ExampleSave.webp"
defer os.Remove(tmpname)

gray := NewMemPImage(image.Rect(0, 0, 400, 300), 1, reflect.Uint8)
if err := Save(tmpname, gray, &Options{Quality: 75}); err != nil {
	log.Fatal(err)
}

func SetMetadata 

func SetMetadata(data, metadata []byte, format string) (newData []byte, err error)

SetMetadata set EXIF/ICCP/XMP format metadata.

func SizeofImage 

func SizeofImage(m image.Image) int

func SizeofKind 

func SizeofKind(dataType reflect.Kind) int
Example 
fmt.Printf("%v = %v\n", reflect.Uint8, SizeofKind(reflect.Uint8))
fmt.Printf("%v = %v\n", reflect.Uint16, SizeofKind(reflect.Uint16))
fmt.Printf("%v = %v\n", reflect.Uint32, SizeofKind(reflect.Uint32))
fmt.Printf("%v = %v\n", reflect.Float32, SizeofKind(reflect.Float32))
fmt.Printf("%v = %v\n", reflect.Float64, SizeofKind(reflect.Float64))

Output:

uint8 = 1
uint16 = 2
uint32 = 4
float32 = 4
float64 = 8

func SizeofPixel 

func SizeofPixel(channels int, dataType reflect.Kind) int
Example 
fmt.Printf("sizeof(gray) = %d\n", SizeofPixel(1, reflect.Uint8))
fmt.Printf("sizeof(gray16) = %d\n", SizeofPixel(1, reflect.Uint16))
fmt.Printf("sizeof(rgb) = %d\n", SizeofPixel(3, reflect.Uint8))
fmt.Printf("sizeof(rgb48) = %d\n", SizeofPixel(3, reflect.Uint16))
fmt.Printf("sizeof(rgba) = %d\n", SizeofPixel(4, reflect.Uint8))
fmt.Printf("sizeof(rgba64) = %d\n", SizeofPixel(4, reflect.Uint16))
fmt.Printf("sizeof(float32) = %d\n", SizeofPixel(1, reflect.Float32))

Output:

sizeof(gray) = 1
sizeof(gray16) = 2
sizeof(rgb) = 3
sizeof(rgb48) = 6
sizeof(rgba) = 4
sizeof(rgba64) = 8
sizeof(float32) = 4

func WebPGetDecoderVersion 

func WebPGetDecoderVersion() uint

Return the decoder's version number, packed in hexadecimal using 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.

func WebPGetInfo 

func WebPGetInfo(data []byte) (width, height int, ok bool)

Retrieve basic header information: width, height. This function will also validate the header and return 0 in case of formatting error. Pointers 'width' and 'height' can be passed NULL if deemed irrelevant.

Types

type Animation added in v1.6.2 

type Animation struct {
	Image      []image.Image
	Delay      []int
	LoopCount  int
	Background color.RGBA
}

Animation represents an animated WebP image. Delay values are in milliseconds.

func DecodeAll added in v1.6.2 

func DecodeAll(r io.Reader) (*Animation, error)

DecodeAll reads a WEBP image from r and returns all frames. Delay values are in milliseconds.

type C_double 

type C_double C.double

type C_float 

type C_float C.float

type C_int 

type C_int C.int

func C_webpDecodeGrayToSize 

func C_webpDecodeGrayToSize(
	data *C_uint8_t, data_size C_size_t,
	width C_int, height C_int, outStride C_int,
	out *C_uint8_t,
) C_int

func C_webpDecodeRGBAToSize 

func C_webpDecodeRGBAToSize(
	data *C_uint8_t, data_size C_size_t,
	width C_int, height C_int, outStride C_int,
	out *C_uint8_t,
) C_int

func C_webpDecodeRGBToSize 

func C_webpDecodeRGBToSize(
	data *C_uint8_t, data_size C_size_t,
	width C_int, height C_int, outStride C_int,
	out *C_uint8_t,
) C_int

func C_webpGetInfo 

func C_webpGetInfo(
	data *C_uint8_t, data_size C_size_t,
	width *C_int, height *C_int,
	has_alpha *C_int,
) C_int

type C_int8_t 

type C_int8_t C.int8_t

type C_int16_t 

type C_int16_t C.int16_t

type C_int32_t 

type C_int32_t C.int32_t

type C_int64_t 

type C_int64_t C.int64_t

type C_size_t 

type C_size_t C.size_t

type C_uint 

type C_uint C.uint

type C_uint8_t 

type C_uint8_t C.uint8_t

func C_webpDecodeGray 

func C_webpDecodeGray(
	data *C_uint8_t, data_size C_size_t,
	width *C_int, height *C_int,
) *C_uint8_t

func C_webpDecodeRGB 

func C_webpDecodeRGB(
	data *C_uint8_t, data_size C_size_t,
	width *C_int, height *C_int,
) *C_uint8_t

func C_webpDecodeRGBA 

func C_webpDecodeRGBA(
	data *C_uint8_t, data_size C_size_t,
	width *C_int, height *C_int,
) *C_uint8_t

func C_webpEncodeGray 

func C_webpEncodeGray(
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	quality_factor C_float,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

func C_webpEncodeLosslessGray 

func C_webpEncodeLosslessGray(
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

func C_webpEncodeLosslessRGB 

func C_webpEncodeLosslessRGB(
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

func C_webpEncodeLosslessRGBA 

func C_webpEncodeLosslessRGBA(
	exact C_int,
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

func C_webpEncodeRGB 

func C_webpEncodeRGB(
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	quality_factor C_float,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

func C_webpEncodeRGBA 

func C_webpEncodeRGBA(
	pix *C_uint8_t,
	width C_int, height C_int, stride C_int,
	quality_factor C_float,
	method C_int,
	target_size C_int,
	alpha_quality C_int,
	auto_filter C_int,
	output_size *C_size_t,
) *C_uint8_t

type C_uint16_t 

type C_uint16_t C.uint16_t

type C_uint32_t 

type C_uint32_t C.uint32_t

type C_uint64_t 

type C_uint64_t C.uint64_t

type ColorModelInterface 

type ColorModelInterface interface {
	Channels() int
	DataType() reflect.Kind
}

type Config added in v1.6.2 

type Config struct {
	ColorModel   color.Model
	Width        int  // Width in pixels, as read from the bitstream.
	Height       int  // Height in pixels, as read from the bitstream.
	HasAlpha     bool // True if the bitstream contains an alpha channel.
	HasAnimation bool // True if the bitstream is an animation.
	Format       int  // 0 = undefined (/mixed), 1 = lossy, 2 = lossless
}

Config is the same as image.Config but includes alpha and animation metadata.

func DecodeConfigEx added in v1.6.2 

func DecodeConfigEx(r io.Reader) (config Config, err error)

DecodeConfigEx returns the color model, dimensions and animation flag of a WEBP image without decoding the entire image.

func LoadConfigEx added in v1.6.2 

func LoadConfigEx(name string) (config Config, err error)

type MemP 

type MemP interface {
	MemPMagic() string
	Bounds() image.Rectangle
	Channels() int
	DataType() reflect.Kind
	Pix() []byte // PixSilce type

	// Stride is the Pix stride (in bytes, must align with SizeofKind(p.DataType))
	// between vertically adjacent pixels.
	Stride() int
}

MemP Image Spec (Native Endian), see https://github.com/chai2010/image.

type MemPColor 

type MemPColor struct {
	Channels int
	DataType reflect.Kind
	Pix      PixSlice
}

func (MemPColor) RGBA 

func (c MemPColor) RGBA() (r, g, b, a uint32)

type MemPImage 

type MemPImage struct {
	XMemPMagic string // MemP
	XRect      image.Rectangle
	XChannels  int
	XDataType  reflect.Kind
	XPix       PixSlice
	XStride    int
}

func AsMemPImage 

func AsMemPImage(m interface{}) (p *MemPImage, ok bool)

m is MemP or image.Image

func NewMemPImage 

func NewMemPImage(r image.Rectangle, channels int, dataType reflect.Kind) *MemPImage

func NewMemPImageFrom 

func NewMemPImageFrom(m image.Image) *MemPImage

func (*MemPImage) AsStdImage 

func (p *MemPImage) AsStdImage() (m image.Image, ok bool)

func (*MemPImage) At 

func (p *MemPImage) At(x, y int) color.Color

func (*MemPImage) Bounds 

func (p *MemPImage) Bounds() image.Rectangle

func (*MemPImage) Channels 

func (p *MemPImage) Channels() int

func (*MemPImage) Clone 

func (p *MemPImage) Clone() *MemPImage

func (*MemPImage) ColorModel 

func (p *MemPImage) ColorModel() color.Model

func (*MemPImage) DataType 

func (p *MemPImage) DataType() reflect.Kind

func (*MemPImage) MemPMagic 

func (p *MemPImage) MemPMagic() string

func (*MemPImage) Pix 

func (p *MemPImage) Pix() []byte

func (*MemPImage) PixOffset 

func (p *MemPImage) PixOffset(x, y int) int

func (*MemPImage) PixelAt 

func (p *MemPImage) PixelAt(x, y int) []byte

func (*MemPImage) Set 

func (p *MemPImage) Set(x, y int, c color.Color)

func (*MemPImage) SetPixel 

func (p *MemPImage) SetPixel(x, y int, c []byte)

func (*MemPImage) StdImage 

func (p *MemPImage) StdImage() image.Image

func (*MemPImage) Stride 

func (p *MemPImage) Stride() int

func (*MemPImage) SubImage 

func (p *MemPImage) SubImage(r image.Rectangle) image.Image

type Options 

type Options struct {
	Lossless     bool
	Quality      float32 // 0 ~ 100
	TargetSize   int     // Target byte size (overrides Quality)
	AlphaQuality int     // Alpha plane quality 0-100 (default 100)
	AutoFilter   bool    // Auto-adjust filter for each image
	Exact        bool    // Preserve RGB values in transparent area.
	Method       int     // Quality/speed trade-off (0=fast, 6=slower-better)
}

Options are the encoding parameters.

type PixSlice 

type PixSlice []byte

func AsPixSilce 

func AsPixSilce(slice interface{}) (d PixSlice)

AsPixSilce convert a normal slice to byte slice.

Convert []X to []byte: 

x := make([]X, xLen)
y := AsPixSilce(x)
Example 
a := []int32{101, 102, 103}
b := AsPixSilce(a)

b.Int32s()[0] = 12345
b.SetValue(1, reflect.Int32, 1002)
b.SetValue(2, reflect.Int32, 1003.5)
fmt.Printf("len(b) = %d\n", len(b))
fmt.Printf("b.Int32s() = %v\n", b.Int32s())

Output:

len(b) = 12
b.Int32s() = [12345 1002 1003]
Example (SwapEndian) 
rgba64 := image.NewRGBA64(image.Rect(0, 0, 1, 1))
rgba64.SetRGBA64(0, 0, color.RGBA64{
	R: 0x0102,
	G: 0x0304,
	B: 0x0506,
	A: 0x0708,
})

// pix is big-endian format
fmt.Printf("big-endian: %v\n", rgba64.Pix)

AsPixSilce(rgba64.Pix).SwapEndian(reflect.Uint16)
fmt.Printf("little-endian: %v\n", rgba64.Pix)

Output:

big-endian: [1 2 3 4 5 6 7 8]
little-endian: [2 1 4 3 6 5 8 7]

func (PixSlice) Bytes 

func (d PixSlice) Bytes() (v []byte)

func (PixSlice) Complex64s 

func (d PixSlice) Complex64s() (v []complex64)

func (PixSlice) Complex128s 

func (d PixSlice) Complex128s() (v []complex128)

func (PixSlice) Float32s 

func (d PixSlice) Float32s() (v []float32)

func (PixSlice) Float64s 

func (d PixSlice) Float64s() (v []float64)

func (PixSlice) Int8s 

func (d PixSlice) Int8s() (v []int8)

func (PixSlice) Int16s 

func (d PixSlice) Int16s() (v []int16)

func (PixSlice) Int32s 

func (d PixSlice) Int32s() (v []int32)

func (PixSlice) Int64s 

func (d PixSlice) Int64s() (v []int64)

func (PixSlice) SetValue 

func (d PixSlice) SetValue(i int, dataType reflect.Kind, v float64)

func (PixSlice) Slice 

func (d PixSlice) Slice(newSliceType reflect.Type) interface{}

Slice convert a normal slice to new type slice.

Convert []byte to []Y: 

x := make([]byte, xLen)
y := PixSlice(x).Slice(reflect.TypeOf([]Y(nil))).([]Y)

func (PixSlice) SwapEndian 

func (d PixSlice) SwapEndian(dataType reflect.Kind)

func (PixSlice) Uint8s 

func (d PixSlice) Uint8s() []uint8

func (PixSlice) Uint16s 

func (d PixSlice) Uint16s() (v []uint16)

func (PixSlice) Uint32s 

func (d PixSlice) Uint32s() (v []uint32)

func (PixSlice) Uint64s 

func (d PixSlice) Uint64s() (v []uint64)

func (PixSlice) Value 

func (d PixSlice) Value(i int, dataType reflect.Kind) float64

type RGB48Image 

type RGB48Image struct {
	XPix    []uint8 // XPix use Native Endian (same as MemP) !!!
	XStride int
	XRect   image.Rectangle
}

func NewRGB48Image 

func NewRGB48Image(r image.Rectangle) *RGB48Image

NewRGB48Image returns a new RGB48Image with the given bounds.

func NewRGB48ImageFrom 

func NewRGB48ImageFrom(m image.Image) *RGB48Image

func (*RGB48Image) At 

func (p *RGB48Image) At(x, y int) color.Color

func (*RGB48Image) Bounds 

func (p *RGB48Image) Bounds() image.Rectangle

func (*RGB48Image) Channels 

func (p *RGB48Image) Channels() int

func (*RGB48Image) ColorModel 

func (p *RGB48Image) ColorModel() color.Model

func (*RGB48Image) DataType 

func (p *RGB48Image) DataType() reflect.Kind

func (*RGB48Image) MemPMagic 

func (p *RGB48Image) MemPMagic() string

func (*RGB48Image) Opaque 

func (p *RGB48Image) Opaque() bool

Opaque scans the entire image and reports whether it is fully opaque.

func (*RGB48Image) Pix 

func (p *RGB48Image) Pix() []byte

func (*RGB48Image) PixOffset 

func (p *RGB48Image) PixOffset(x, y int) int

PixOffset returns the index of the first element of XPix that corresponds to the pixel at (x, y).

func (*RGB48Image) RGB48At 

func (p *RGB48Image) RGB48At(x, y int) [3]uint16

func (*RGB48Image) Set 

func (p *RGB48Image) Set(x, y int, c color.Color)

func (*RGB48Image) SetRGB48 

func (p *RGB48Image) SetRGB48(x, y int, c [3]uint16)

func (*RGB48Image) Stride 

func (p *RGB48Image) Stride() int

func (*RGB48Image) SubImage 

func (p *RGB48Image) SubImage(r image.Rectangle) image.Image

SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image.

type RGBImage 

type RGBImage struct {
	XPix    []uint8
	XStride int
	XRect   image.Rectangle
}

func DecodeRGB 

func DecodeRGB(data []byte) (m *RGBImage, err error)

func DecodeRGBToSize 

func DecodeRGBToSize(data []byte, width, height int) (m *RGBImage, err error)

DecodeRGBToSize decodes an RGB image scaled to the given dimensions.

func NewRGBImage 

func NewRGBImage(r image.Rectangle) *RGBImage

NewRGBImage returns a new RGBImage with the given bounds.

func NewRGBImageFrom 

func NewRGBImageFrom(m image.Image) *RGBImage

func (*RGBImage) At 

func (p *RGBImage) At(x, y int) color.Color

func (*RGBImage) Bounds 

func (p *RGBImage) Bounds() image.Rectangle

func (*RGBImage) Channels 

func (p *RGBImage) Channels() int

func (*RGBImage) ColorModel 

func (p *RGBImage) ColorModel() color.Model

func (*RGBImage) DataType 

func (p *RGBImage) DataType() reflect.Kind

func (*RGBImage) MemPMagic 

func (p *RGBImage) MemPMagic() string

func (*RGBImage) Opaque 

func (p *RGBImage) Opaque() bool

Opaque scans the entire image and reports whether it is fully opaque.

func (*RGBImage) Pix 

func (p *RGBImage) Pix() []byte

func (*RGBImage) PixOffset 

func (p *RGBImage) PixOffset(x, y int) int

PixOffset returns the index of the first element of Pix that corresponds to the pixel at (x, y).

func (*RGBImage) RGBAt 

func (p *RGBImage) RGBAt(x, y int) [3]uint8

func (*RGBImage) Set 

func (p *RGBImage) Set(x, y int, c color.Color)

func (*RGBImage) SetRGB 

func (p *RGBImage) SetRGB(x, y int, c [3]uint8)

func (*RGBImage) Stride 

func (p *RGBImage) Stride() int

func (*RGBImage) SubImage 

func (p *RGBImage) SubImage(r image.Rectangle) image.Image

SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image.

type SizeofImager 

type SizeofImager interface {
	SizeofImage() int
}

Source Files

View all Source files

Directories

Path Synopsis
Package webp_bench provides more benchmark for webp.
 Package webp_bench provides more benchmark for webp.
See https://github.com/dvyukov/go-fuzz
 See https://github.com/dvyukov/go-fuzz
internal
libwebp-1.6.0/swig

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