LibSoftGPU: Drop unnecessary FP divisions in to_vec4

Author: https://github.com/gmta
Commit: ab6a869f55
Pull-request: https://github.com/SerenityOS/serenity/pull/11496
Reviewed-by: https://github.com/sunverwerth ✅

Userland/Libraries/LibSoftGPU/Device.cpp

@@ -47,11 +47,12 @@ ALWAYS_INLINE constexpr static Gfx::RGBA32 to_rgba32(const FloatVector4& v)
 
 static FloatVector4 to_vec4(Gfx::RGBA32 rgba)
 {
+    auto constexpr one_over_255 = 1.0f / 255;
     return {
-        ((rgba >> 16) & 0xff) / 255.0f,
+        ((rgba >> 16) & 0xff) * one_over_255,
-        ((rgba >> 8) & 0xff) / 255.0f,
+        ((rgba >> 8) & 0xff) * one_over_255,
-        (rgba & 0xff) / 255.0f,
+        (rgba & 0xff) * one_over_255,
-        ((rgba >> 24) & 0xff) / 255.0f
+        ((rgba >> 24) & 0xff) * one_over_255,
     };
 }