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graphics: Add performance tips on DrawImage

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Hajime Hoshi 2017-09-24 01:14:16 +09:00
parent e8acd9b6a2
commit 1995219b55
1 changed files with 10 additions and 0 deletions
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10
image.go
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@ -80,6 +80,16 @@ func (i *Image) Fill(clr color.Color) error {
//
// When the given image is as same as i, DrawImage panics.
//
// DrawImage works more efficiently as batches
// when the successive calls of DrawImages satisfies the below conditions:
//
// * All render targets are same (A in A.DrawImage(B, op))
// * All render sources are same (B in A.DrawImage(B, op))
// * All ColorM values are same
// * All CompositeMode values are same
//
// For more performance tips, see https://github.com/hajimehoshi/ebiten/wiki/Performance-Tips.
//
// DrawImage always returns nil as of 1.5.0-alpha.
func (i *Image) DrawImage(img *Image, options *DrawImageOptions) error {
if i == img {