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graphics: Speed optimization: Use CompositeModeCopy instead of Clear

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This commit is contained in:
Hajime Hoshi 2018-02-22 01:18:33 +09:00
parent c6b813a321
commit 1179c12d35
1 changed files with 1 additions and 1 deletions
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2
graphicscontext.go
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@ -94,6 +94,7 @@ func drawWithFittingScale(dst *Image, src *Image) {
sh := float64(hd) / float64(hs) sh := float64(hd) / float64(hs)
op := &DrawImageOptions{} op := &DrawImageOptions{}
op.GeoM.Scale(sw, sh) op.GeoM.Scale(sw, sh)
op.CompositeMode = CompositeModeCopy
_ = dst.DrawImage(src, op) _ = dst.DrawImage(src, op)
} }
@ -116,7 +117,6 @@ func (c *graphicsContext) Update(afterFrameUpdate func()) error {
} }
if 0 < updateCount { if 0 < updateCount {
drawWithFittingScale(c.offscreen2, c.offscreen) drawWithFittingScale(c.offscreen2, c.offscreen)
_ = c.screen.Clear()
drawWithFittingScale(c.screen, c.offscreen2) drawWithFittingScale(c.screen, c.offscreen2)
} }