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internal/buffered: update pixels instead of dotsBuffer when possible

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This commit is contained in:
Hajime Hoshi 2024-01-17 00:00:31 +09:00
parent 26e2748732
commit 3cbc1870bf
1 changed files with 13 additions and 1 deletions
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14
internal/buffered/image.go
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@ -120,8 +120,20 @@ func (i *Image) WritePixels(pix []byte, region image.Rectangle) {
} }
// Writing one pixel is a special case. // Writing one pixel is a special case.
// Do not discard the cached pixels in this case, especially for (image/draw).Image. // Do not write pixels in GPU especially for (image/draw).Image.
if region.Dx() == 1 && region.Dy() == 1 { if region.Dx() == 1 && region.Dy() == 1 {
// If i.pixels exists, update this instead of adding an entry to dotsBuffer.
if i.pixels != nil {
idx := 4 * (region.Min.Y*i.width + region.Min.X)
i.pixels[idx] = pix[0]
i.pixels[idx+1] = pix[1]
i.pixels[idx+2] = pix[2]
i.pixels[idx+3] = pix[3]
i.pixelsUnsynced = true
delete(i.dotsBuffer, region.Min)
return
}
if i.dotsBuffer == nil { if i.dotsBuffer == nil {
i.dotsBuffer = map[image.Point][4]byte{} i.dotsBuffer = map[image.Point][4]byte{}
} }