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shareable: Add comments

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Hajime Hoshi 2019-02-10 14:13:00 +09:00
parent 339155f63d
commit 6f428c584d
1 changed files with 4 additions and 3 deletions
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7
internal/shareable/shareable.go
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@ -296,9 +296,10 @@ func (i *Image) Fill(r, g, b, a uint8) {
rf, gf, bf, af) rf, gf, bf, af)
is := graphics.QuadIndices() is := graphics.QuadIndices()
c := graphics.CompositeModeSourceOver c := graphics.CompositeModeCopy
if a < 0xff { if a == 0xff {
c = graphics.CompositeModeCopy // If the color is opaque, SourceOver is available and this is preferable for optimization.
c = graphics.CompositeModeSourceOver
} }
i.DrawImage(emptyImage, vs, is, nil, c, graphics.FilterNearest, graphics.AddressClampToZero) i.DrawImage(emptyImage, vs, is, nil, c, graphics.FilterNearest, graphics.AddressClampToZero)
} }