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LibGfx: Remove SSE version of Color::blend()

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I could not discover proof that this is actually faster than the non-SSE
version. In addition, for these relatively simple structures, the
compiler is often sufficiently smart to generate SSE code itself.

For a synthetic font benchmark I wrote, this results in a nice 11%
decrease in runtime.
This commit is contained in:
Jelle Raaijmakers 2023-06-01 13:18:19 +02:00 • committed by Andreas Kling
parent 3f9cfa144c
commit 5bac9df865
1 changed files with 5 additions and 24 deletions
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29
Userland/Libraries/LibGfx/Color.h
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@ -204,37 +204,18 @@ public:
constexpr Color blend(Color source) const constexpr Color blend(Color source) const
{ {
if (!alpha() || source.alpha() == 255) if (alpha() == 0 || source.alpha() == 255)
return source; return source;
if (!source.alpha()) if (source.alpha() == 0)
return *this; return *this;
#ifdef __SSE__
using AK::SIMD::i32x4;
const i32x4 color = {
red(),
green(),
blue()
};
const i32x4 source_color = {
source.red(),
source.green(),
source.blue()
};
int const d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha(); int const d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
const i32x4 out = (color * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source_color) / d; u8 r = (red() * alpha() * (255 - source.alpha()) + source.red() * 255 * source.alpha()) / d;
return Color(out[0], out[1], out[2], d / 255); u8 g = (green() * alpha() * (255 - source.alpha()) + source.green() * 255 * source.alpha()) / d;
#else u8 b = (blue() * alpha() * (255 - source.alpha()) + source.blue() * 255 * source.alpha()) / d;
int d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
u8 r = (red() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.red()) / d;
u8 g = (green() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.green()) / d;
u8 b = (blue() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.blue()) / d;
u8 a = d / 255; u8 a = d / 255;
return Color(r, g, b, a); return Color(r, g, b, a);
#endif
} }
ALWAYS_INLINE Color mixed_with(Color other, float weight) const ALWAYS_INLINE Color mixed_with(Color other, float weight) const