consistent names, alphaFix 80char
This commit is contained in:
Ryan Oldenburg
parent
78b1dbab03
commit
1ad2f3e05f
1 changed files with 199 additions and 220 deletions
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@ -69,42 +69,38 @@ proc `-`*(c: Color, v: float32): Color {.inline.} =
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result.b = c.b - v
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result.a = c.a - v
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proc screen(Cb, Cs: float32): float32 {.inline.} =
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1 - (1 - Cb) * (1 - Cs)
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proc screen(backdrop, source: float32): float32 {.inline.} =
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1 - (1 - backdrop) * (1 - source)
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proc hardLight(Cb, Cs: float32): float32 {.inline.} =
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if Cs <= 0.5:
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Cb * 2 * Cs
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proc hardLight(backdrop, source: float32): float32 {.inline.} =
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if source <= 0.5:
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backdrop * 2 * source
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else:
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screen(Cb, 2 * Cs - 1)
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screen(backdrop, 2 * source - 1)
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proc softLight(a, b: float32): float32 {.inline.} =
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proc softLight(backdrop, source: float32): float32 {.inline.} =
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## Pegtop
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(1 - 2 * b) * a ^ 2 + 2 * b * a
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(1 - 2 * source) * backdrop ^ 2 + 2 * source * backdrop
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proc Lum(C: Color): float32 {.inline.} =
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0.3 * C.r + 0.59 * C.g + 0.11 * C.b
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proc ClipColor(C: Color): Color {.inline.} =
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proc ClipColor(C: var Color) {.inline.} =
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let
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L = Lum(C)
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n = min([C.r, C.g, C.b])
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x = max([C.r, C.g, C.b])
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var
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C = C
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if n < 0:
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C = L + (((C - L) * L) / (L - n))
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if x > 1:
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C = L + (((C - L) * (1 - L)) / (x - L))
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return C
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proc SetLum(C: Color, l: float32): Color {.inline.} =
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let
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d = l - Lum(C)
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let d = l - Lum(C)
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result.r = C.r + d
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result.g = C.g + d
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result.b = C.b + d
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return ClipColor(result)
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ClipColor(result)
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proc Sat(C: Color): float32 {.inline.} =
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max([C.r, C.g, C.b]) - min([C.r, C.g, C.b])
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@ -114,266 +110,249 @@ proc SetSat(C: Color, s: float32): Color {.inline.} =
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if satC > 0:
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result = (C - min([C.r, C.g, C.b])) * s / satC
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proc alphaFix(Cb, Cs, mixed: Color): Color {.inline.} =
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let ab = Cb.a
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let As = Cs.a
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result.r = As * (1 - ab) * Cs.r + As * ab * mixed.r + (1 - As) * ab * Cb.r
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result.g = As * (1 - ab) * Cs.g + As * ab * mixed.g + (1 - As) * ab * Cb.g
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result.b = As * (1 - ab) * Cs.b + As * ab * mixed.b + (1 - As) * ab * Cb.b
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proc alphaFix(backdrop, source, mixed: Color): Color =
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let
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t0 = source.a * (1 - backdrop.a)
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t1 = source.a * backdrop.a
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t2 = (1 - source.a) * backdrop.a
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result.a = (Cs.a + Cb.a * (1.0 - Cs.a))
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result.r = t0 * source.r + t1 * mixed.r + t2 * backdrop.r
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result.g = t0 * source.g + t1 * mixed.g + t2 * backdrop.g
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result.b = t0 * source.b + t1 * mixed.b + t2 * backdrop.b
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result.a = (source.a + backdrop.a * (1.0 - source.a))
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result.r /= result.a
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result.g /= result.a
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result.b /= result.a
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proc blendDarkenFloat(Cb, Cs: float32): float32 {.inline.} =
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min(Cb, Cs)
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proc blendNormalFloats(backdrop, source: Color): Color {.inline.} =
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result = source
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result = alphaFix(backdrop, source, result)
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proc blendMultiplyFloat(Cb, Cs: float32): float32 {.inline.} =
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Cb * Cs
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proc blendDarkenFloats(backdrop, source: Color): Color {.inline.} =
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result.r = min(backdrop.r, source.r)
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result.g = min(backdrop.g, source.g)
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result.b = min(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendLinearBurnFloat(Cb, Cs: float32): float32 {.inline.} =
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Cb + Cs - 1
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proc blendMultiplyFloats(backdrop, source: Color): Color {.inline.} =
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result.r = backdrop.r * source.r
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result.g = backdrop.g * source.g
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result.b = backdrop.b * source.b
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result = alphaFix(backdrop, source, result)
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proc blendColorBurnFloat(Cb, Cs: float32): float32 {.inline.} =
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if Cb == 1: 1.0
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elif Cs == 0: 0.0
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else: 1.0 - min(1, (1 - Cb) / Cs)
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proc blendLinearBurnFloats(backdrop, source: Color): Color {.inline.} =
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result.r = backdrop.r + source.r - 1
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result.g = backdrop.g + source.g - 1
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result.b = backdrop.b + source.b - 1
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result = alphaFix(backdrop, source, result)
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proc blendLightenFloat(Cb, Cs: float32): float32 {.inline.} =
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max(Cb, Cs)
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proc blendColorBurnFloats(backdrop, source: Color): Color {.inline.} =
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proc blend(backdrop, source: float32): float32 {.inline.} =
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if backdrop == 1:
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1.0
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elif source == 0:
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0.0
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else:
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1.0 - min(1, (1 - backdrop) / source)
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result.r = blend(backdrop.r, source.r)
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result.g = blend(backdrop.g, source.g)
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result.b = blend(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendScreenFloat(Cb, Cs: float32): float32 {.inline.} =
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screen(Cb, Cs)
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proc blendLightenFloats(backdrop, source: Color): Color {.inline.} =
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result.r = max(backdrop.r, source.r)
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result.g = max(backdrop.g, source.g)
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result.b = max(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendLinearDodgeFloat(Cb, Cs: float32): float32 {.inline.} =
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Cb + Cs
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proc blendScreenFloats(backdrop, source: Color): Color {.inline.} =
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result.r = screen(backdrop.r, source.r)
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result.g = screen(backdrop.g, source.g)
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result.b = screen(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendColorDodgeFloat(Cb, Cs: float32): float32 {.inline.} =
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if Cb == 0: 0.0
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elif Cs == 1: 1.0
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else: min(1, Cb / (1 - Cs))
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proc blendLinearDodgeFloats(backdrop, source: Color): Color {.inline.} =
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result.r = backdrop.r + source.r
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result.g = backdrop.g + source.g
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result.b = backdrop.b + source.b
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result = alphaFix(backdrop, source, result)
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proc blendOverlayFloat(Cb, Cs: float32): float32 {.inline.} =
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hardLight(Cs, Cb)
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proc blendColorDodgeFloats(backdrop, source: Color): Color {.inline.} =
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proc blend(backdrop, source: float32): float32 {.inline.} =
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if backdrop == 0:
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0.0
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elif source == 1:
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1.0
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else:
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min(1, backdrop / (1 - source))
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result.r = blend(backdrop.r, source.r)
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result.g = blend(backdrop.g, source.g)
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result.b = blend(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendHardLightFloat(Cb, Cs: float32): float32 {.inline.} =
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hardLight(Cb, Cs)
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proc blendOverlayFloats(backdrop, source: Color): Color {.inline.} =
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result.r = hardLight(source.r, backdrop.r)
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result.g = hardLight(source.g, backdrop.g)
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result.b = hardLight(source.b, backdrop.b)
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result = alphaFix(backdrop, source, result)
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proc blendSoftLightFloat(Cb, Cs: float32): float32 {.inline.} =
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softLight(Cb, Cs)
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proc blendHardLightFloats(backdrop, source: Color): Color {.inline.} =
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result.r = hardLight(backdrop.r, source.r)
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result.g = hardLight(backdrop.g, source.g)
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result.b = hardLight(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendDifferenceFloat(Cb, Cs: float32): float32 {.inline.} =
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abs(Cb - Cs)
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proc blendSoftLightFloats(backdrop, source: Color): Color {.inline.} =
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result.r = softLight(backdrop.r, source.r)
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result.g = softLight(backdrop.g, source.g)
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result.b = softLight(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendExclusionFloat(Cb, Cs: float32): float32 {.inline.} =
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Cb + Cs - 2 * Cb * Cs
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proc blendDifferenceFloats(backdrop, source: Color): Color {.inline.} =
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result.r = abs(backdrop.r - source.r)
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result.g = abs(backdrop.g - source.g)
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result.b = abs(backdrop.b - source.b)
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result = alphaFix(backdrop, source, result)
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proc blendNormalFloats(Cb, Cs: Color): Color {.inline.} =
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result = Cs
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result = alphaFix(Cb, Cs, result)
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proc blendExclusionFloats(backdrop, source: Color): Color {.inline.} =
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proc blend(backdrop, source: float32): float32 {.inline.} =
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backdrop + source - 2 * backdrop * source
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result.r = blend(backdrop.r, source.r)
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result.g = blend(backdrop.g, source.g)
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result.b = blend(backdrop.b, source.b)
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result = alphaFix(backdrop, source, result)
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proc blendDarkenFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendDarkenFloat(Cb.r, Cs.r)
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result.g = blendDarkenFloat(Cb.g, Cs.g)
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result.b = blendDarkenFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendColorFloats(backdrop, source: Color): Color {.inline.} =
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result = SetLum(source, Lum(backdrop))
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result = alphaFix(backdrop, source, result)
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proc blendMultiplyFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendMultiplyFloat(Cb.r, Cs.r)
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result.g = blendMultiplyFloat(Cb.g, Cs.g)
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result.b = blendMultiplyFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendLuminosityFloats(backdrop, source: Color): Color {.inline.} =
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result = SetLum(backdrop, Lum(source))
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result = alphaFix(backdrop, source, result)
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proc blendLinearBurnFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendLinearBurnFloat(Cb.r, Cs.r)
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result.g = blendLinearBurnFloat(Cb.g, Cs.g)
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result.b = blendLinearBurnFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendHueFloats(backdrop, source: Color): Color {.inline.} =
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result = SetLum(SetSat(source, Sat(backdrop)), Lum(backdrop))
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result = alphaFix(backdrop, source, result)
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proc blendColorBurnFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendColorBurnFloat(Cb.r, Cs.r)
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result.g = blendColorBurnFloat(Cb.g, Cs.g)
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result.b = blendColorBurnFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendSaturationFloats(backdrop, source: Color): Color {.inline.} =
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result = SetLum(SetSat(backdrop, Sat(source)), Lum(backdrop))
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result = alphaFix(backdrop, source, result)
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proc blendLightenFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendLightenFloat(Cb.r, Cs.r)
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result.g = blendLightenFloat(Cb.g, Cs.g)
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result.b = blendLightenFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendMaskFloats(backdrop, source: Color): Color {.inline.} =
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result = backdrop
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result.a = min(backdrop.a, source.a)
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proc blendScreenFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendScreenFloat(Cb.r, Cs.r)
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result.g = blendScreenFloat(Cb.g, Cs.g)
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result.b = blendScreenFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendSubtractMaskFloats(backdrop, source: Color): Color {.inline.} =
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result = backdrop
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result.a = backdrop.a * (1 - source.a)
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proc blendLinearDodgeFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendLinearDodgeFloat(Cb.r, Cs.r)
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result.g = blendLinearDodgeFloat(Cb.g, Cs.g)
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result.b = blendLinearDodgeFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendIntersectMaskFloats(backdrop, source: Color): Color {.inline.} =
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result = backdrop
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result.a = backdrop.a * source.a
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proc blendColorDodgeFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendColorDodgeFloat(Cb.r, Cs.r)
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result.g = blendColorDodgeFloat(Cb.g, Cs.g)
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result.b = blendColorDodgeFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendExcludeMaskFloats(backdrop, source: Color): Color {.inline.} =
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result = backdrop
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result.a = abs(backdrop.a - source.a)
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proc blendOverlayFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendOverlayFloat(Cb.r, Cs.r)
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result.g = blendOverlayFloat(Cb.g, Cs.g)
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result.b = blendOverlayFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendOverwriteFloats(backdrop, source: Color): Color {.inline.} =
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source
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proc blendHardLightFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendHardLightFloat(Cb.r, Cs.r)
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result.g = blendHardLightFloat(Cb.g, Cs.g)
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result.b = blendHardLightFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc alphaFix(backdrop, source, mixed: ColorRGBA): ColorRGBA {.inline.} =
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let
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sa = source.a.int32
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ba = backdrop.a.int32
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t0 = sa * (255 - ba)
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t1 = sa * ba
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t2 = (255 - sa) * ba
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proc blendSoftLightFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendSoftLightFloat(Cb.r, Cs.r)
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result.g = blendSoftLightFloat(Cb.g, Cs.g)
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result.b = blendSoftLightFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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let
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r = t0 * source.r.int32 + t1 * mixed.r.int32 + t2 * backdrop.r.int32
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g = t0 * source.g.int32 + t1 * mixed.g.int32 + t2 * backdrop.g.int32
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b = t0 * source.b.int32 + t1 * mixed.b.int32 + t2 * backdrop.b.int32
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a = sa + ba * (255 - sa) div 255
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proc blendDifferenceFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendDifferenceFloat(Cb.r, Cs.r)
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result.g = blendDifferenceFloat(Cb.g, Cs.g)
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result.b = blendDifferenceFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendExclusionFloats(Cb, Cs: Color): Color {.inline.} =
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result.r = blendExclusionFloat(Cb.r, Cs.r)
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result.g = blendExclusionFloat(Cb.g, Cs.g)
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result.b = blendExclusionFloat(Cb.b, Cs.b)
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result = alphaFix(Cb, Cs, result)
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proc blendColorFloats(Cb, Cs: Color): Color {.inline.} =
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let mixed = SetLum(Cs, Lum(Cb))
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alphaFix(Cb, Cs, mixed)
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proc blendLuminosityFloats(Cb, Cs: Color): Color {.inline.} =
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let mixed = SetLum(Cb, Lum(Cs))
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alphaFix(Cb, Cs, mixed)
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proc blendHueFloats(Cb, Cs: Color): Color {.inline.} =
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let mixed = SetLum(SetSat(Cs, Sat(Cb)), Lum(Cb))
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alphaFix(Cb, Cs, mixed)
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proc blendSaturationFloats(Cb, Cs: Color): Color {.inline.} =
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let mixed = SetLum(SetSat(Cb, Sat(Cs)), Lum(Cb))
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alphaFix(Cb, Cs, mixed)
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proc blendMaskFloats(target, blend: Color): Color {.inline.} =
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result = target
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result.a = min(target.a, blend.a)
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proc blendSubtractMaskFloats(target, blend: Color): Color {.inline.} =
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result = target
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result.a = target.a * (1 - blend.a)
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proc blendIntersectMaskFloats(target, blend: Color): Color {.inline.} =
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result = target
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result.a = target.a * blend.a
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proc blendExcludeMaskFloats(target, blend: Color): Color {.inline.} =
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result = target
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result.a = abs(target.a - blend.a)
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proc blendOverwriteFloats(target, blend: Color): Color {.inline.} =
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result = blend
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proc alphaFix(Cb, Cs, mixed: ColorRGBA): ColorRGBA {.inline.} =
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let ab = Cb.a.int32
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let As = Cs.a.int32
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let r = As * (255 - ab) * Cs.r.int32 + As * ab * mixed.r.int32 + (255 - As) * ab * Cb.r.int32
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let g = As * (255 - ab) * Cs.g.int32 + As * ab * mixed.g.int32 + (255 - As) * ab * Cb.g.int32
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let b = As * (255 - ab) * Cs.b.int32 + As * ab * mixed.b.int32 + (255 - As) * ab * Cb.b.int32
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let a = Cs.a.int32 + Cb.a.int32 * (255 - Cs.a.int32) div 255
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if a == 0:
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return
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else:
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result.r = (r div a div 255).uint8
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result.g = (g div a div 255).uint8
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||||
result.b = (b div a div 255).uint8
|
||||
result.a = a.uint8
|
||||
|
||||
proc blendNormal(a, b: ColorRGBA): ColorRGBA =
|
||||
blendNormalFloats(a.color, b.color).rgba
|
||||
proc blendNormal(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
result = source
|
||||
result = alphaFix(backdrop, source, result)
|
||||
|
||||
proc blendDarken(a, b: ColorRGBA): ColorRGBA =
|
||||
blendDarkenFloats(a.color, b.color).rgba
|
||||
proc blendDarken(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendDarkenFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendMultiply(a, b: ColorRGBA): ColorRGBA =
|
||||
blendMultiplyFloats(a.color, b.color).rgba
|
||||
proc blendMultiply(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendMultiplyFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendLinearBurn(a, b: ColorRGBA): ColorRGBA =
|
||||
blendLinearBurnFloats(a.color, b.color).rgba
|
||||
proc blendLinearBurn(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendLinearBurnFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendColorBurn(a, b: ColorRGBA): ColorRGBA =
|
||||
blendColorBurnFloats(a.color, b.color).rgba
|
||||
proc blendColorBurn(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendColorBurnFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendLighten(a, b: ColorRGBA): ColorRGBA =
|
||||
blendLightenFloats(a.color, b.color).rgba
|
||||
proc blendLighten(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendLightenFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendScreen(a, b: ColorRGBA): ColorRGBA =
|
||||
blendScreenFloats(a.color, b.color).rgba
|
||||
proc blendScreen(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendScreenFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendLinearDodge(a, b: ColorRGBA): ColorRGBA =
|
||||
blendLinearDodgeFloats(a.color, b.color).rgba
|
||||
proc blendLinearDodge(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendLinearDodgeFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendColorDodge(a, b: ColorRGBA): ColorRGBA =
|
||||
blendColorDodgeFloats(a.color, b.color).rgba
|
||||
proc blendColorDodge(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendColorDodgeFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendOverlay(a, b: ColorRGBA): ColorRGBA =
|
||||
blendOverlayFloats(a.color, b.color).rgba
|
||||
proc blendOverlay(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendOverlayFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendHardLight(a, b: ColorRGBA): ColorRGBA =
|
||||
blendHardLightFloats(a.color, b.color).rgba
|
||||
proc blendHardLight(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendHardLightFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendSoftLight(a, b: ColorRGBA): ColorRGBA =
|
||||
blendSoftLightFloats(a.color, b.color).rgba
|
||||
proc blendSoftLight(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendSoftLightFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendDifference(a, b: ColorRGBA): ColorRGBA =
|
||||
blendDifferenceFloats(a.color, b.color).rgba
|
||||
proc blendDifference(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendDifferenceFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendExclusion(a, b: ColorRGBA): ColorRGBA =
|
||||
blendExclusionFloats(a.color, b.color).rgba
|
||||
proc blendExclusion(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendExclusionFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendColor(a, b: ColorRGBA): ColorRGBA =
|
||||
blendColorFloats(a.color, b.color).rgba
|
||||
proc blendColor(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendColorFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendLuminosity(a, b: ColorRGBA): ColorRGBA =
|
||||
blendLuminosityFloats(a.color, b.color).rgba
|
||||
proc blendLuminosity(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendLuminosityFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendHue(a, b: ColorRGBA): ColorRGBA =
|
||||
blendHueFloats(a.color, b.color).rgba
|
||||
proc blendHue(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendHueFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendSaturation(a, b: ColorRGBA): ColorRGBA =
|
||||
blendSaturationFloats(a.color, b.color).rgba
|
||||
proc blendSaturation(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
blendSaturationFloats(backdrop.color, source.color).rgba
|
||||
|
||||
proc blendMask(a, b: ColorRGBA): ColorRGBA =
|
||||
result = a
|
||||
result.a = min(a.a, b.a)
|
||||
proc blendMask(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
result = backdrop
|
||||
result.a = min(backdrop.a, source.a)
|
||||
|
||||
proc blendSubtractMask(a, b: ColorRGBA): ColorRGBA =
|
||||
result = a
|
||||
result.a = max(0, (a.a.int32 * (255 - b.a.int32)) div 255).uint8
|
||||
proc blendSubtractMask(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
result = backdrop
|
||||
result.a = max(0, (backdrop.a.int32 * (255 - source.a.int32)) div 255).uint8
|
||||
|
||||
proc blendIntersectMask(a, b: ColorRGBA): ColorRGBA =
|
||||
result = a
|
||||
result.a = ((a.a.uint32 * (b.a.uint32)) div 255).uint8
|
||||
proc blendIntersectMask(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
result = backdrop
|
||||
result.a = ((backdrop.a.uint32 * (source.a.uint32)) div 255).uint8
|
||||
|
||||
proc blendExcludeMask(a, b: ColorRGBA): ColorRGBA =
|
||||
result = a
|
||||
result.a = max(a.a, b.a) - min(a.a, b.a)
|
||||
proc blendExcludeMask(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
result = backdrop
|
||||
result.a = max(backdrop.a, source.a) - min(backdrop.a, source.a)
|
||||
|
||||
proc blendOverwrite(a, b: ColorRGBA): ColorRGBA =
|
||||
b
|
||||
proc blendOverwrite(backdrop, source: ColorRGBA): ColorRGBA =
|
||||
source
|
||||
|
||||
proc mixer*(blendMode: BlendMode): Mixer =
|
||||
case blendMode
|
||||
|
|
|
|||
Loading…
Reference in a new issue