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graphics: Bug fix: a too old frame was rendered at least on Android

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Fixes #520
This commit is contained in:
Hajime Hoshi 2018-03-01 11:37:01 +09:00
parent 1a898dd1b9
commit deab21fad1
1 changed files with 16 additions and 17 deletions
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33
graphicscontext.go
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@ -97,27 +97,26 @@ func (c *graphicsContext) Update(afterFrameUpdate func()) error {
}
afterFrameUpdate()
}
if 0 < updateCount {
// Call ClearFramebuffer instead of c.screen.Clear()
// to clear the whole region including fullscreen's padding.
c.screen.restorable.ClearFramebuffer()
dw, dh := c.screen.Size()
sw, _ := c.offscreen.Size()
scale := float64(dw) / float64(sw)
// Call ClearFramebuffer instead of c.screen.Clear()
// to clear the whole region including fullscreen's padding.
c.screen.restorable.ClearFramebuffer()
op := &DrawImageOptions{}
dw, dh := c.screen.Size()
sw, _ := c.offscreen.Size()
scale := float64(dw) / float64(sw)
// c.screen is special: its Y axis is down to up,
// and the origin point is lower left.
op.GeoM.Scale(scale, -scale)
op.GeoM.Translate(0, float64(dh))
op.GeoM.Translate(c.offsetX, c.offsetY)
op := &DrawImageOptions{}
op.CompositeMode = CompositeModeCopy
op.Filter = filterScreen
_ = c.screen.DrawImage(c.offscreen, op)
}
// c.screen is special: its Y axis is down to up,
// and the origin point is lower left.
op.GeoM.Scale(scale, -scale)
op.GeoM.Translate(0, float64(dh))
op.GeoM.Translate(c.offsetX, c.offsetY)
op.CompositeMode = CompositeModeCopy
op.Filter = filterScreen
_ = c.screen.DrawImage(c.offscreen, op)
if err := restorable.ResolveStaleImages(); err != nil {
return err