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LibGfx: Avoid float->double->float when converting from linear to gamma
Benchmark shows 5x speedup (from 644ms to 110ms).
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@ -106,7 +106,7 @@ inline float linear_to_gamma(float x)
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constexpr float a = 0.00279491;
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constexpr float b = 1.15907984;
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float c = (b / sqrt(1 + a)) - 1;
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return ((b / __builtin_sqrt(x + a)) - c) * x;
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return ((b / __builtin_sqrtf(x + a)) - c) * x;
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}
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// Linearize v1 and v2, lerp them by mix factor, then convert back.
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