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graphics: Update the document about DrawImage

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Hajime Hoshi 2019-01-19 22:14:04 +09:00
parent 79b5712410
commit c1c0306471
1 changed files with 4 additions and 4 deletions
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8
image.go
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@ -218,14 +218,14 @@ func (i *Image) disposeMipmaps() {
// 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))
// * This is not a strong request since different images might share a same inner
// OpenGL texture in high possibility. This is not 100%, so using the same render
// source is safer.
// * All ColorM values are same, or all the ColorM have only 'scale' operations
// * All CompositeMode values are same
// * All Filter values are same
//
// Even when all the above conditions are satisfied, multiple draw commands can be used in really rare cases. Ebiten
// images usually share an internal automatic texture atlas, but when you consume the atlas, or you create a huge
// image, those images cannot be on the same texture atlas. In this case, draw commands are separated.
//
// For more performance tips, see https://github.com/hajimehoshi/ebiten/wiki/Performance-Tips.
//
// DrawImage always returns nil as of 1.5.0-alpha.