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sw_engine: rectified softlight blending equation
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Browse source 
slightly adjusted the equation for adobe/figma alignment
This commit is contained in:
Hermet Park 2025-07-10 20:04:23 +09:00
parent ac12c8c9a3
commit f6a9efcc3f
1 changed files with 5 additions and 5 deletions
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10
src/renderer/sw_engine/tvgSwCommon.h
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@ -558,12 +558,12 @@ static inline uint32_t opBlendSoftLight(uint32_t s, uint32_t d, TVG_UNUSED uint8
if (d == 0) return s;
RenderColor o;
if (!UNPREMULTIPLY(d, o)) o.r = o.g = o.b = 0;
if (!UNPREMULTIPLY(d, o)) return 0;
//(255 - 2 * s) * (d * d) + (2 * s * b)
auto c1 = MULTIPLY(255 - std::min(255, 2 * C1(s)), MULTIPLY(o.r, o.r)) + MULTIPLY(std::min(255, 2 * C1(s)), o.r);
auto c2 = MULTIPLY(255 - std::min(255, 2 * C2(s)), MULTIPLY(o.g, o.g)) + MULTIPLY(std::min(255, 2 * C2(s)), o.g);
auto c3 = MULTIPLY(255 - std::min(255, 2 * C3(s)), MULTIPLY(o.b, o.b)) + MULTIPLY(std::min(255, 2 * C3(s)), o.b);
//(255 - 2 * s) * (d * d) + (2 * s * d)
auto c1 = MULTIPLY(255 - std::min(255, 2 * C1(s)), MULTIPLY(o.r, o.r)) + std::min(255, 2 * MULTIPLY(C1(s), o.r));
auto c2 = MULTIPLY(255 - std::min(255, 2 * C2(s)), MULTIPLY(o.g, o.g)) + std::min(255, 2 * MULTIPLY(C2(s), o.g));
auto c3 = MULTIPLY(255 - std::min(255, 2 * C3(s)), MULTIPLY(o.b, o.b)) + std::min(255, 2 * MULTIPLY(C3(s), o.b));
return JOIN(255, c1, c2, c3);
}