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graphics: Avoid copying color.RGBA struct

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This commit is contained in:
Hajime Hoshi 2016-12-27 01:08:22 +09:00
parent 6b4801ac7a
commit 3db15bc5bf
1 changed files with 10 additions and 7 deletions
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17
internal/graphics/image.go
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@ -34,9 +34,13 @@ func CopyImage(origImg image.Image) *image.RGBA {
y0 := b.Min.Y
x1 := b.Max.X
y1 := b.Max.Y
palette := make([]color.RGBA, len(origImg.Palette))
palette := make([]uint8, len(origImg.Palette)*4)
for i, c := range origImg.Palette {
palette[i] = color.RGBAModel.Convert(c).(color.RGBA)
rgba := color.RGBAModel.Convert(c).(color.RGBA)
palette[4*i] = rgba.R
palette[4*i+1] = rgba.G
palette[4*i+2] = rgba.B
palette[4*i+3] = rgba.A
}
index0 := y0*origImg.Stride + x0
index1 := 0
@ -45,11 +49,10 @@ func CopyImage(origImg image.Image) *image.RGBA {
for j := 0; j < y1-y0; j++ {
for i := 0; i < x1-x0; i++ {
p := origImg.Pix[index0]
c := palette[p]
newImg.Pix[index1] = c.R
newImg.Pix[index1+1] = c.G
newImg.Pix[index1+2] = c.B
newImg.Pix[index1+3] = c.A
newImg.Pix[index1] = palette[4*p]
newImg.Pix[index1+1] = palette[4*p+1]
newImg.Pix[index1+2] = palette[4*p+2]
newImg.Pix[index1+3] = palette[4*p+3]
index0++
index1 += 4
}