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PixelPaint+LibGfx: Add sepia color filter

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Xavier Defrang 2022-01-08 10:36:04 +01:00 • committed by Andreas Kling
parent 2502a88e49
commit b1a15b02f1
7 changed files with 147 additions and 0 deletions
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27
Userland/Libraries/LibGfx/Color.h
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@ -232,6 +232,33 @@ public:
return Color(gray, gray, gray, alpha());
}
constexpr Color sepia(float amount = 1.0f) const
{
auto blend_factor = 1.0f - amount;
auto r1 = 0.393f + 0.607f * blend_factor;
auto r2 = 0.769f - 0.769f * blend_factor;
auto r3 = 0.189f - 0.189f * blend_factor;
auto g1 = 0.349f - 0.349f * blend_factor;
auto g2 = 0.686f + 0.314f * blend_factor;
auto g3 = 0.168f - 0.168f * blend_factor;
auto b1 = 0.272f - 0.272f * blend_factor;
auto b2 = 0.534f - 0.534f * blend_factor;
auto b3 = 0.131f + 0.869f * blend_factor;
auto r = red();
auto g = green();
auto b = blue();
return Color(
clamp(lroundf(r * r1 + g * r2 + b * r3), 0, 255),
clamp(lroundf(r * g1 + g * g2 + b * g3), 0, 255),
clamp(lroundf(r * b1 + g * b2 + b * b3), 0, 255),
alpha());
}
constexpr Color darkened(float amount = 0.5f) const
{
return Color(red() * amount, green() * amount, blue() * amount, alpha());