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simd alphafix wins

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This commit is contained in:
Ryan Oldenburg 2020-12-09 05:47:34 -06:00
parent d6a9429850
commit 8ef4b3ecc8
1 changed files with 21 additions and 17 deletions
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38
src/pixie/blends.nim
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@ -1,5 +1,5 @@
## Blending modes. ## Blending modes.
import chroma, math import chroma, math, nimsimd/sse2
# See https://www.w3.org/TR/compositing-1/ # See https://www.w3.org/TR/compositing-1/
# See https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_blend_equation_advanced.txt # See https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_blend_equation_advanced.txt
@ -260,24 +260,28 @@ proc blendOverwriteFloats(backdrop, source: Color): Color {.inline.} =
proc alphaFix(backdrop, source, mixed: ColorRGBA): ColorRGBA {.inline.} = proc alphaFix(backdrop, source, mixed: ColorRGBA): ColorRGBA {.inline.} =
let let
sa = source.a.int32 sa = source.a.float32
ba = backdrop.a.int32 ba = backdrop.a.float32
t0 = sa * (255 - ba) a = sa + ba * (255 - sa) / 255
t1 = sa * ba if a < 1:
t2 = (255 - sa) * ba
let
r = t0 * source.r.int32 + t1 * mixed.r.int32 + t2 * backdrop.r.int32
g = t0 * source.g.int32 + t1 * mixed.g.int32 + t2 * backdrop.g.int32
b = t0 * source.b.int32 + t1 * mixed.b.int32 + t2 * backdrop.b.int32
a = sa + ba * (255 - sa) div 255
if a == 0:
return return
result.r = (r div a div 255).uint8 let
result.g = (g div a div 255).uint8 vb = mm_setr_ps(backdrop.r.float32, backdrop.g.float32, backdrop.b.float32, 0)
result.b = (b div a div 255).uint8 vs = mm_setr_ps(source.r.float32, source.g.float32, source.b.float32, 0)
vm = mm_setr_ps(mixed.r.float32, mixed.g.float32, mixed.b.float32, 0)
vt0 = mm_set1_ps(sa * (255 - ba))
vt1 = mm_set1_ps(sa * ba)
vt2 = mm_set1_ps((255 - sa) * ba)
va = mm_set1_ps(a)
v255 = mm_set1_ps(255)
values = cast[array[4, int32]](
mm_cvtps_epi32((vt0 * vs + vt1 * vm + vt2 * vb) / va / v255)
)
result.r = values[0].uint8
result.g = values[1].uint8
result.b = values[2].uint8
result.a = a.uint8 result.a = a.uint8
proc blendNormal(backdrop, source: ColorRGBA): ColorRGBA = proc blendNormal(backdrop, source: ColorRGBA): ColorRGBA =