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image_color.go
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image_color.go
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// Copyright 2014 <chaishushan{AT}gmail.com>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package webp
import (
"image/color"
"reflect"
)
type MemPColor struct {
Channels int
DataType reflect.Kind
Pix PixSlice
}
func (c MemPColor) RGBA() (r, g, b, a uint32) {
if len(c.Pix) == 0 {
return
}
switch c.Channels {
case 1:
switch reflect.Kind(c.DataType) {
case reflect.Uint8:
return color.Gray{
Y: c.Pix[0],
}.RGBA()
case reflect.Uint16:
return color.Gray16{
Y: c.Pix.Uint16s()[0],
}.RGBA()
default:
return color.Gray16{
Y: uint16(c.Pix.Value(0, reflect.Kind(c.DataType))),
}.RGBA()
}
case 2:
switch reflect.Kind(c.DataType) {
case reflect.Uint8:
return color.RGBA{
R: c.Pix[0],
G: c.Pix[1],
B: 0xFF,
A: 0xFF,
}.RGBA()
case reflect.Uint16:
return color.RGBA64{
R: c.Pix.Uint16s()[0],
G: c.Pix.Uint16s()[1],
B: 0xFFFF,
A: 0xFFFF,
}.RGBA()
default:
return color.RGBA64{
R: uint16(c.Pix.Value(0, reflect.Kind(c.DataType))),
G: uint16(c.Pix.Value(1, reflect.Kind(c.DataType))),
B: 0xFFFF,
A: 0xFFFF,
}.RGBA()
}
case 3:
switch reflect.Kind(c.DataType) {
case reflect.Uint8:
return color.RGBA{
R: c.Pix[0],
G: c.Pix[1],
B: c.Pix[2],
A: 0xFF,
}.RGBA()
case reflect.Uint16:
return color.RGBA64{
R: c.Pix.Uint16s()[0],
G: c.Pix.Uint16s()[1],
B: c.Pix.Uint16s()[2],
A: 0xFFFF,
}.RGBA()
default:
return color.RGBA64{
R: uint16(c.Pix.Value(0, reflect.Kind(c.DataType))),
G: uint16(c.Pix.Value(1, reflect.Kind(c.DataType))),
B: uint16(c.Pix.Value(2, reflect.Kind(c.DataType))),
A: 0xFFFF,
}.RGBA()
}
case 4:
switch reflect.Kind(c.DataType) {
case reflect.Uint8:
return color.RGBA{
R: c.Pix[0],
G: c.Pix[1],
B: c.Pix[2],
A: c.Pix[3],
}.RGBA()
case reflect.Uint16:
return color.RGBA64{
R: c.Pix.Uint16s()[0],
G: c.Pix.Uint16s()[1],
B: c.Pix.Uint16s()[2],
A: c.Pix.Uint16s()[3],
}.RGBA()
default:
return color.RGBA64{
R: uint16(c.Pix.Value(0, reflect.Kind(c.DataType))),
G: uint16(c.Pix.Value(1, reflect.Kind(c.DataType))),
B: uint16(c.Pix.Value(2, reflect.Kind(c.DataType))),
A: uint16(c.Pix.Value(3, reflect.Kind(c.DataType))),
}.RGBA()
}
}
return
}
type ColorModelInterface interface {
Channels() int
DataType() reflect.Kind
}
type _ColorModelT struct {
XChannels int
XDataType reflect.Kind
}
var (
_ ColorModelInterface = _ColorModelT{1, reflect.Uint8}
)
func (m _ColorModelT) Convert(c color.Color) color.Color {
return colorModelConvert(m.XChannels, m.XDataType, c)
}
func (m _ColorModelT) Channels() int {
return m.XChannels
}
func (m _ColorModelT) DataType() reflect.Kind {
return m.XDataType
}
func ColorModel(channels int, dataType reflect.Kind) color.Model {
return _ColorModelT{
XChannels: channels,
XDataType: dataType,
}
}
func colorModelConvert(channels int, dataType reflect.Kind, c color.Color) color.Color {
c2 := MemPColor{
Channels: channels,
DataType: dataType,
Pix: make(PixSlice, channels*SizeofKind(dataType)),
}
if c1, ok := c.(MemPColor); ok {
if c1.Channels == c2.Channels && c1.DataType == c2.DataType {
copy(c2.Pix, c1.Pix)
return c2
}
if c1.DataType == c2.DataType {
copy(c2.Pix, c1.Pix)
return c2
}
for i := 0; i < c1.Channels && i < c2.Channels; i++ {
c2.Pix.SetValue(i, reflect.Kind(c2.DataType), c1.Pix.Value(i, reflect.Kind(c1.DataType)))
}
return c2
}
switch {
case channels == 1 && reflect.Kind(dataType) == reflect.Uint8:
v := color.GrayModel.Convert(c).(color.Gray)
c2.Pix[0] = v.Y
return c2
case channels == 1 && reflect.Kind(dataType) == reflect.Uint16:
v := color.Gray16Model.Convert(c).(color.Gray16)
c2.Pix[0] = uint8(v.Y >> 8)
c2.Pix[1] = uint8(v.Y)
return c2
case channels == 3 && reflect.Kind(dataType) == reflect.Uint8:
r, g, b, _ := c.RGBA()
c2.Pix[0] = uint8(r >> 8)
c2.Pix[1] = uint8(g >> 8)
c2.Pix[2] = uint8(b >> 8)
return c2
case channels == 3 && reflect.Kind(dataType) == reflect.Uint16:
r, g, b, _ := c.RGBA()
c2.Pix[0] = uint8(r >> 8)
c2.Pix[1] = uint8(r)
c2.Pix[2] = uint8(g >> 8)
c2.Pix[3] = uint8(g)
c2.Pix[4] = uint8(b >> 8)
c2.Pix[5] = uint8(b)
return c2
case channels == 4 && reflect.Kind(dataType) == reflect.Uint8:
r, g, b, a := c.RGBA()
c2.Pix[0] = uint8(r >> 8)
c2.Pix[1] = uint8(g >> 8)
c2.Pix[2] = uint8(b >> 8)
c2.Pix[3] = uint8(a >> 8)
return c2
case channels == 4 && reflect.Kind(dataType) == reflect.Uint16:
r, g, b, a := c.RGBA()
c2.Pix[0] = uint8(r >> 8)
c2.Pix[1] = uint8(r)
c2.Pix[2] = uint8(g >> 8)
c2.Pix[3] = uint8(g)
c2.Pix[4] = uint8(b >> 8)
c2.Pix[5] = uint8(b)
c2.Pix[6] = uint8(a >> 8)
c2.Pix[7] = uint8(a)
return c2
}
r, g, b, a := c.RGBA()
rgba := []uint32{r, g, b, a}
for i := 0; i < c2.Channels && i < len(rgba); i++ {
c2.Pix.SetValue(i, reflect.Kind(c2.DataType), float64(rgba[i]))
}
return c2
}
func SizeofKind(dataType reflect.Kind) int {
switch dataType {
case reflect.Int8:
return 1
case reflect.Int16:
return 2
case reflect.Int32:
return 4
case reflect.Int64:
return 8
case reflect.Uint8:
return 1
case reflect.Uint16:
return 2
case reflect.Uint32:
return 4
case reflect.Uint64:
return 8
case reflect.Float32:
return 4
case reflect.Float64:
return 8
case reflect.Complex64:
return 8
case reflect.Complex128:
return 16
}
return 0
}
func SizeofPixel(channels int, dataType reflect.Kind) int {
return channels * SizeofKind(dataType)
}