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ebiten: Follow image.RGBA64Image's aim

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image.RGBA64Image aims to get 64bit color values efficiently to avoid
allocating an original color value and converting it to colorRGBA64.
Thus, we should avoid allocating color.RGBA for RGBA64At.

Updates #1769
This commit is contained in:
Hajime Hoshi 2021-08-21 15:22:33 +09:00
parent fd58f84deb
commit ba8ea50d57
1 changed files with 22 additions and 17 deletions
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39
image.go
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@ -691,21 +691,8 @@ func (i *Image) ColorModel() color.Model {
// //
// At can't be called outside the main loop (ebiten.Run's updating function) starts. // At can't be called outside the main loop (ebiten.Run's updating function) starts.
func (i *Image) At(x, y int) color.Color { func (i *Image) At(x, y int) color.Color {
if i.isDisposed() { r, g, b, a := i.at(x, y)
return color.RGBA{} return color.RGBA{r, g, b, a}
}
if !image.Pt(x, y).In(i.Bounds()) {
return color.RGBA{}
}
pix, err := i.mipmap.Pixels(x, y, 1, 1)
if err != nil {
if panicOnErrorAtImageAt {
panic(err)
}
theUIContext.setError(err)
return color.RGBA{}
}
return color.RGBA{pix[0], pix[1], pix[2], pix[3]}
} }
// RGBA64At implements image.RGBA64Image's RGBA64At. // RGBA64At implements image.RGBA64Image's RGBA64At.
@ -720,8 +707,26 @@ func (i *Image) At(x, y int) color.Color {
// //
// RGBA64At can't be called outside the main loop (ebiten.Run's updating function) starts. // RGBA64At can't be called outside the main loop (ebiten.Run's updating function) starts.
func (i *Image) RGBA64At(x, y int) color.RGBA64 { func (i *Image) RGBA64At(x, y int) color.RGBA64 {
r, g, b, a := i.At(x, y).(color.RGBA).RGBA() r, g, b, a := i.at(x, y)
return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} return color.RGBA64{uint16(r) * 0x101, uint16(g) * 0x101, uint16(b) * 0x101, uint16(a) * 0x101}
}
func (i *Image) at(x, y int) (r, g, b, a uint8) {
if i.isDisposed() {
return 0, 0, 0, 0
}
if !image.Pt(x, y).In(i.Bounds()) {
return 0, 0, 0, 0
}
pix, err := i.mipmap.Pixels(x, y, 1, 1)
if err != nil {
if panicOnErrorAtImageAt {
panic(err)
}
theUIContext.setError(err)
return 0, 0, 0, 0
}
return pix[0], pix[1], pix[2], pix[3]
} }
// Set sets the color at (x, y). // Set sets the color at (x, y).