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blendExclusion 50% faster

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Ryan Oldenburg 2021-02-09 23:34:49 -06:00
parent 59b186b535
commit 81dbfacdda
1 changed files with 6 additions and 5 deletions
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11
src/pixie/blends.nim
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@ -55,11 +55,12 @@ proc blendNormal(backdrop, source: ColorRGBA): ColorRGBA =
result.a = blendAlpha(backdrop.a, source.a) result.a = blendAlpha(backdrop.a, source.a)
proc blendExclusion(backdrop, source: ColorRGBA): ColorRGBA = proc blendExclusion(backdrop, source: ColorRGBA): ColorRGBA =
proc blend(backdrop, source: int32): uint8 {.inline.} = proc blend(backdrop, source: uint32): uint8 {.inline.} =
max(0, backdrop + source - (2 * backdrop * source) div 255).uint8 let v = (backdrop + source).int32 - ((2 * backdrop * source) div 255).int32
result.r = blend(backdrop.r.int32, source.r.int32) (cast[uint32](v) and uint8.high.uint32).uint8
result.g = blend(backdrop.g.int32, source.g.int32) result.r = blend(backdrop.r.uint32, source.r.uint32)
result.b = blend(backdrop.b.int32, source.b.int32) result.g = blend(backdrop.g.uint32, source.g.uint32)
result.b = blend(backdrop.b.uint32, source.b.uint32)
result.a = blendAlpha(backdrop.a, source.a) result.a = blendAlpha(backdrop.a, source.a)
proc blendMask(backdrop, source: ColorRGBA): ColorRGBA = proc blendMask(backdrop, source: ColorRGBA): ColorRGBA =