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more premul blends

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This commit is contained in:
Ryan Oldenburg 2021-02-09 14:01:13 -06:00
parent 05252eeee9
commit 913c7e9498
1 changed files with 16 additions and 7 deletions
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23
src/pixie/blends.nim
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@ -58,9 +58,21 @@ proc blendNormalPremultiplied*(backdrop, source: ColorRGBA): ColorRGBA =
result.b = source.b + ((backdrop.b.uint32 * k) div 255).uint8
result.a = blendAlpha(backdrop.a, source.a)
proc blendMask(backdrop, source: ColorRGBA): ColorRGBA =
let k = source.a.uint32
result.r = ((backdrop.r * k) div 255).uint8
result.g = ((backdrop.g * k) div 255).uint8
result.b = ((backdrop.b * k) div 255).uint8
result.a = ((backdrop.a * k) div 255).uint8
proc blendOverwrite*(backdrop, source: ColorRGBA): ColorRGBA =
source
proc blenderPremultiplied*(blendMode: BlendMode): Blender =
case blendMode:
of bmNormal: blendNormalPremultiplied
of bmOverwrite: blendOverwrite
of bmMask: blendMask
else:
raise newException(PixieError, "No premultiplied blender for " & $blendMode)
@ -94,9 +106,13 @@ when defined(amd64) and not defined(pixieNoSimd):
mm_or_si128(backdropEven, mm_slli_epi16(backdropOdd, 8))
)
proc blendOverwriteSimd*(backdrop, source: M128i): M128i =
source
proc blenderSimd*(blendMode: BlendMode): BlenderSimd =
case blendMode:
of bmNormal: blendNormalPremultipliedSimd
of bmOverwrite: blendOverwriteSimd
else:
raise newException(PixieError, "No SIMD blender for " & $blendMode)
@ -530,10 +546,6 @@ proc blendHue(backdrop, source: ColorRGBA): ColorRGBA =
proc blendSaturation(backdrop, source: ColorRGBA): ColorRGBA =
blendSaturationFloats(backdrop.color, source.color).rgba
proc blendMask(backdrop, source: ColorRGBA): ColorRGBA =
result = backdrop
result.a = min(backdrop.a, source.a)
proc blendSubtractMask(backdrop, source: ColorRGBA): ColorRGBA =
result = backdrop
result.a = max(0, (backdrop.a.int32 * (255 - source.a.int32)) div 255).uint8
@ -546,9 +558,6 @@ proc blendExcludeMask(backdrop, source: ColorRGBA): ColorRGBA =
result = backdrop
result.a = max(backdrop.a, source.a) - min(backdrop.a, source.a)
proc blendOverwrite(backdrop, source: ColorRGBA): ColorRGBA =
source
proc blender*(blendMode: BlendMode): Blender =
case blendMode:
of bmNormal: blendNormal