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This commit is contained in:
Ryan Oldenburg 2021-01-28 22:26:56 -06:00
parent 77701751c3
commit dad7440e04
1 changed files with 52 additions and 52 deletions
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104
src/pixie/blends.nim
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@ -36,6 +36,58 @@ type
Mixer* = proc(a, b: ColorRGBA): ColorRGBA
when defined(release):
{.push checks: off.}
proc blendNormalPremultiplied*(backdrop, source: ColorRGBA): ColorRGBA {.inline.} =
if backdrop.a == 0:
return source
if source.a == 255:
return source
if source.a == 0:
return backdrop
let k = (255 - source.a.uint32)
result.r = source.r + ((backdrop.r.uint32 * k) div 255).uint8
result.g = source.g + ((backdrop.g.uint32 * k) div 255).uint8
result.b = source.b + ((backdrop.b.uint32 * k) div 255).uint8
result.a = source.a + ((backdrop.a.uint32 * k) div 255).uint8
when defined(amd64) and not defined(pixieNoSimd):
proc blendNormalPremultiplied*(backdrop, source: M128i): M128i {.inline.} =
let
alphaMask = mm_set1_epi32(cast[int32](0xff000000))
oddMask = mm_set1_epi16(cast[int16](0xff00))
div255 = mm_set1_epi16(cast[int16](0x8081))
# Shortcuts didn't help (backdrop.a == 0, source.a == 0, source.a == 255)
var
sourceAlpha = mm_and_si128(source, alphaMask)
backdropEven = mm_slli_epi16(backdrop, 8)
backdropOdd = mm_and_si128(backdrop, oddMask)
sourceAlpha = mm_or_si128(sourceAlpha, mm_srli_epi32(sourceAlpha, 16))
let k = mm_sub_epi32(
mm_set1_epi32(cast[int32]([0.uint8, 255, 0, 255])),
sourceAlpha
)
backdropEven = mm_mulhi_epu16(backdropEven, k)
backdropOdd = mm_mulhi_epu16(backdropOdd, k)
backdropEven = mm_srli_epi16(mm_mulhi_epu16(backdropEven, div255), 7)
backdropOdd = mm_srli_epi16(mm_mulhi_epu16(backdropOdd, div255), 7)
mm_add_epi8(
source,
mm_or_si128(backdropEven, mm_slli_epi16(backdropOdd, 8))
)
when defined(release):
{.pop.}
proc `+`*(a, b: Color): Color {.inline.} =
result.r = a.r + b.r
result.g = a.g + b.g
@ -504,55 +556,3 @@ proc mixer*(blendMode: BlendMode): Mixer =
of bmSubtractMask: blendSubtractMask
of bmIntersectMask: blendIntersectMask
of bmExcludeMask: blendExcludeMask
when defined(release):
{.push checks: off.}
proc blendNormalPremultiplied*(backdrop, source: ColorRGBA): ColorRGBA {.inline.} =
if backdrop.a == 0:
return source
if source.a == 255:
return source
if source.a == 0:
return backdrop
let k = (255 - source.a.uint32)
result.r = source.r + ((backdrop.r.uint32 * k) div 255).uint8
result.g = source.g + ((backdrop.g.uint32 * k) div 255).uint8
result.b = source.b + ((backdrop.b.uint32 * k) div 255).uint8
result.a = source.a + ((backdrop.a.uint32 * k) div 255).uint8
when defined(amd64) and not defined(pixieNoSimd):
proc blendNormalPremultiplied*(backdrop, source: M128i): M128i {.inline.} =
let
alphaMask = mm_set1_epi32(cast[int32](0xff000000))
oddMask = mm_set1_epi16(cast[int16](0xff00))
div255 = mm_set1_epi16(cast[int16](0x8081))
# Shortcuts didn't help (backdrop.a == 0, source.a == 0, source.a == 255)
var
sourceAlpha = mm_and_si128(source, alphaMask)
backdropEven = mm_slli_epi16(backdrop, 8)
backdropOdd = mm_and_si128(backdrop, oddMask)
sourceAlpha = mm_or_si128(sourceAlpha, mm_srli_epi32(sourceAlpha, 16))
let k = mm_sub_epi32(
mm_set1_epi32(cast[int32]([0.uint8, 255, 0, 255])),
sourceAlpha
)
backdropEven = mm_mulhi_epu16(backdropEven, k)
backdropOdd = mm_mulhi_epu16(backdropOdd, k)
backdropEven = mm_srli_epi16(mm_mulhi_epu16(backdropEven, div255), 7)
backdropOdd = mm_srli_epi16(mm_mulhi_epu16(backdropOdd, div255), 7)
mm_add_epi8(
source,
mm_or_si128(backdropEven, mm_slli_epi16(backdropOdd, 8))
)
when defined(release):
{.pop.}