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Add Opaque method to the image types.

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R=rsc
CC=golang-dev
https://golang.org/cl/1533041
This commit is contained in:
Nigel Tao 2010-06-03 17:18:26 -07:00
parent 9a70762ac9
commit c2e9f0c562
2 changed files with 102 additions and 0 deletions
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96
src/pkg/image/image.go
View File

@ -36,6 +36,23 @@ func (p *RGBA) At(x, y int) Color { return p.Pixel[y][x] }
func (p *RGBA) Set(x, y int, c Color) { p.Pixel[y][x] = toRGBAColor(c).(RGBAColor) }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *RGBA) Opaque() bool {
h := len(p.Pixel)
if h > 0 {
w := len(p.Pixel[0])
for y := 0; y < h; y++ {
pix := p.Pixel[y]
for x := 0; x < w; x++ {
if pix[x].A != 0xff {
return false
}
}
}
}
return true
}
// NewRGBA returns a new RGBA with the given width and height.
func NewRGBA(w, h int) *RGBA {
buf := make([]RGBAColor, w*h)
@ -67,6 +84,23 @@ func (p *RGBA64) At(x, y int) Color { return p.Pixel[y][x] }
func (p *RGBA64) Set(x, y int, c Color) { p.Pixel[y][x] = toRGBA64Color(c).(RGBA64Color) }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *RGBA64) Opaque() bool {
h := len(p.Pixel)
if h > 0 {
w := len(p.Pixel[0])
for y := 0; y < h; y++ {
pix := p.Pixel[y]
for x := 0; x < w; x++ {
if pix[x].A != 0xffff {
return false
}
}
}
}
return true
}
// NewRGBA64 returns a new RGBA64 with the given width and height.
func NewRGBA64(w, h int) *RGBA64 {
buf := make([]RGBA64Color, w*h)
@ -98,6 +132,23 @@ func (p *NRGBA) At(x, y int) Color { return p.Pixel[y][x] }
func (p *NRGBA) Set(x, y int, c Color) { p.Pixel[y][x] = toNRGBAColor(c).(NRGBAColor) }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *NRGBA) Opaque() bool {
h := len(p.Pixel)
if h > 0 {
w := len(p.Pixel[0])
for y := 0; y < h; y++ {
pix := p.Pixel[y]
for x := 0; x < w; x++ {
if pix[x].A != 0xff {
return false
}
}
}
}
return true
}
// NewNRGBA returns a new NRGBA with the given width and height.
func NewNRGBA(w, h int) *NRGBA {
buf := make([]NRGBAColor, w*h)
@ -129,6 +180,23 @@ func (p *NRGBA64) At(x, y int) Color { return p.Pixel[y][x] }
func (p *NRGBA64) Set(x, y int, c Color) { p.Pixel[y][x] = toNRGBA64Color(c).(NRGBA64Color) }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *NRGBA64) Opaque() bool {
h := len(p.Pixel)
if h > 0 {
w := len(p.Pixel[0])
for y := 0; y < h; y++ {
pix := p.Pixel[y]
for x := 0; x < w; x++ {
if pix[x].A != 0xffff {
return false
}
}
}
}
return true
}
// NewNRGBA64 returns a new NRGBA64 with the given width and height.
func NewNRGBA64(w, h int) *NRGBA64 {
buf := make([]NRGBA64Color, w*h)
@ -160,6 +228,23 @@ func (p *Alpha) At(x, y int) Color { return p.Pixel[y][x] }
func (p *Alpha) Set(x, y int, c Color) { p.Pixel[y][x] = toAlphaColor(c).(AlphaColor) }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *Alpha) Opaque() bool {
h := len(p.Pixel)
if h > 0 {
w := len(p.Pixel[0])
for y := 0; y < h; y++ {
pix := p.Pixel[y]
for x := 0; x < w; x++ {
if pix[x].A != 0xff {
return false
}
}
}
}
return true
}
// NewAlpha returns a new Alpha with the given width and height.
func NewAlpha(w, h int) *Alpha {
buf := make([]AlphaColor, w*h)
@ -235,6 +320,17 @@ func (p *Paletted) SetColorIndex(x, y int, index uint8) {
p.Pixel[y][x] = index
}
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (p *Paletted) Opaque() bool {
for _, c := range p.Palette {
_, _, _, a := c.RGBA()
if a != 0xffff {
return false
}
}
return true
}
// NewPaletted returns a new Paletted with the given width, height and palette.
func NewPaletted(w, h int, m PalettedColorModel) *Paletted {
buf := make([]uint8, w*h)

6
src/pkg/image/names.go
View File

@ -48,3 +48,9 @@ func (c ColorImage) Width() int { return 1e9 }
func (c ColorImage) Height() int { return 1e9 }
func (c ColorImage) At(x, y int) Color { return c.C }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (c ColorImage) Opaque() bool {
_, _, _, a := c.C.RGBA()
return a == 0xffff
}