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

1 files changed, 5 insertions, 4 deletions

diff --git a/Userland/Libraries/LibGfx/Gamma.h b/Userland/Libraries/LibGfx/Gamma.h
index dbb645aa18..face37f303 100644
--- a/Userland/Libraries/LibGfx/Gamma.h
+++ b/Userland/Libraries/LibGfx/Gamma.h
@@ -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.