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ebiten: add comments about SubImage as destinations

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Updates #2232
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Hajime Hoshi 2022-10-03 01:55:35 +09:00
parent dcc98e78e9
commit 940d6b11c8
1 changed files with 4 additions and 0 deletions
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4
image.go
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@ -703,6 +703,10 @@ func (i *Image) DrawRectShader(width, height int, shader *Shader, options *DrawR
// A sub-image returned by SubImage can be used as a rendering source and a rendering destination. // A sub-image returned by SubImage can be used as a rendering source and a rendering destination.
// If a sub-image is used as a rendering source, the image is used as if it is a small image. // If a sub-image is used as a rendering source, the image is used as if it is a small image.
// If a sub-image is used as a rendering destination, the region being rendered is clipped. // If a sub-image is used as a rendering destination, the region being rendered is clipped.
//
// Successive uses of multiple various regions as rendering destination might not be efficient,
// even though all the underlying images are the same.
// It's because such renderings cannot be unified into one internal draw command.
func (i *Image) SubImage(r image.Rectangle) image.Image { func (i *Image) SubImage(r image.Rectangle) image.Image {
i.copyCheck() i.copyCheck()
if i.isDisposed() { if i.isDisposed() {