David Maciejak ef1a504898 wrlib: alpha combine speed improvement ...

This patch is improving the alpha combine function by using int
instead of float. That function is used for example in the
switch panel to merge the transparency mask.
The change is practically indistinguishable to the human eye
for a single-pass blend but the performance gained is huge.

I've been doing some benchmark of wrlib and even implemented AVX2 support.
But the gain compared to the complexity of AVX2 is not worth,
while having int usage in that specific function is a really good trade-off.

Here the result:

Alpha Blending Performance Test
Image size: 1024x768 (786432 pixels)
Iterations: 100

AVX2 support: YES

=== RGBA Source Test ===
Original (float):     2.540 ms/frame  (393.8 FPS)
Optimized (int):      1.983 ms/frame  (504.2 FPS)  [1.3x speedup]
AVX2 optimized:       1.843 ms/frame  (542.6 FPS)  [1.4x speedup]

By using int, the alpha blending in that use case is 28% faster.

2026-01-27 10:56:30 +00:00

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