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sw_engine: rectified softlight blending equation

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slightly adjusted the equation for adobe/figma alignment
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Hermet Park 2025-07-10 20:04:23 +09:00 • committed by Mira Grudzinska
parent 95ffa3c352
commit 8c9c2888cc
1 changed files with 3 additions and 3 deletions
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6
src/renderer/sw_engine/tvgSwCommon.h
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@ -478,9 +478,9 @@ static inline uint32_t opBlendHardLight(uint32_t s, uint32_t d, TVG_UNUSED uint8
static inline uint32_t opBlendSoftLight(uint32_t s, uint32_t d, TVG_UNUSED uint8_t a)
{
//(255 - 2 * s) * (d * d) + (2 * s * b)
auto c1 = MULTIPLY(255 - std::min(255, 2 * C1(s)), MULTIPLY(C1(d), C1(d))) + MULTIPLY(std::min(255, 2 * C1(s)), C1(d));
auto c2 = MULTIPLY(255 - std::min(255, 2 * C2(s)), MULTIPLY(C2(d), C2(d))) + MULTIPLY(std::min(255, 2 * C2(s)), C2(d));
auto c3 = MULTIPLY(255 - std::min(255, 2 * C3(s)), MULTIPLY(C3(d), C3(d))) + MULTIPLY(std::min(255, 2 * C3(s)), C3(d));
auto c1 = MULTIPLY(255 - std::min(255, 2 * C1(s)), MULTIPLY(C1(d), C1(d))) + std::min(255, 2 * MULTIPLY(C1(s), C1(d)));
auto c2 = MULTIPLY(255 - std::min(255, 2 * C2(s)), MULTIPLY(C2(d), C2(d))) + std::min(255, 2 * MULTIPLY(C2(s), C2(d)));
auto c3 = MULTIPLY(255 - std::min(255, 2 * C3(s)), MULTIPLY(C3(d), C3(d))) + std::min(255, 2 * MULTIPLY(C3(s), C3(d)));
return JOIN(255, c1, c2, c3);
}