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Slightly rework the scale algorithm.

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This doesn't change the output for the double floating point emulation,
but improves the output for the Sint32 version.
This commit is contained in:
Mark de Wever 2012-03-04 21:43:20 +00:00
parent 2f52d77416
commit e8925c8487
1 changed files with 3 additions and 4 deletions
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7
src/sdl_utils.cpp
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@ -513,11 +513,10 @@ surface scale_surface(const surface &surf, int w, int h, bool optimize)
}
if (alpha != 0) {
tfloat factor = 1 / alpha;
red = red / alpha + 0.5;
green = green / alpha + 0.5;
blue = blue / alpha + 0.5;
alpha = alpha / summation + 0.5;
red = red * factor + 0.5;
green = green * factor + 0.5;
blue = blue * factor + 0.5;
}
dst_pixels[ydst*dst->w + xdst] = SDL_MapRGBA(