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graphics: CopyImage optimization

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This commit is contained in:
Hajime Hoshi 2016-12-27 03:21:07 +09:00
parent 5c9b9ef6cb
commit 260b938422
1 changed files with 7 additions and 6 deletions
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13
internal/graphics/image.go
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@ -47,14 +47,15 @@ func CopyImage(origImg image.Image) *image.RGBA {
index1 := 0
d0 := origImg.Stride - (x1 - x0)
d1 := newImg.Stride - (x1-x0)*4
pix := origImg.Pix
pix0 := origImg.Pix
pix1 := newImg.Pix
for j := 0; j < y1-y0; j++ {
for i := 0; i < x1-x0; i++ {
p := pix[index0]
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]
p := pix0[index0]
pix1[index1] = palette[4*p]
pix1[index1+1] = palette[4*p+1]
pix1[index1+2] = palette[4*p+2]
pix1[index1+3] = palette[4*p+3]
index0++
index1 += 4
}