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LibGfx: Use AK's rsqrt and cast to floats earlier

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Hendiadyoin1 2022-04-01 13:49:02 +02:00 • committed by Andreas Kling
parent 5ba5a6615d
commit d03a6cc6c6
2 changed files with 17 additions and 16 deletions
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9
Userland/Libraries/LibGfx/Gamma.h
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@ -14,6 +14,7 @@
#endif
#include <AK/SIMD.h>
#include <AK/SIMDMath.h>
#define GAMMA 2.2
@ -59,8 +60,8 @@ inline f32x4 linear_to_gamma4(f32x4 x)
// Source for approximation: https://mimosa-pudica.net/fast-gamma/
constexpr float a = 0.00279491f;
constexpr float b = 1.15907984f;
float c = (b / AK::sqrt(1.0f + a)) - 1;
return ((b * __builtin_ia32_rsqrtps(x + a)) - c) * x;
float c = (b * AK::rsqrt(1.0f + a)) - 1;
return ((b * AK::SIMD::rsqrt(x + a)) - c) * x;
}
// Linearize v1 and v2, lerp them by mix factor, then convert back.
@ -86,8 +87,8 @@ inline float linear_to_gamma(float x)
// Source for approximation: https://mimosa-pudica.net/fast-gamma/
constexpr float a = 0.00279491;
constexpr float b = 1.15907984;
float c = (b / AK::sqrt(1 + a)) - 1;
return ((b / AK::sqrt(x + a)) - c) * x;
float c = (b * AK::rsqrt(1 + a)) - 1;
return ((b * AK::rsqrt(x + a)) - c) * x;
}
// Linearize v1 and v2, lerp them by mix factor, then convert back.