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Fixed compiler warning

This commit is contained in:
Sam Lantinga 2021-10-30 21:42:07 -07:00
parent cd66c050fe
commit a01aaf053c
1 changed files with 6 additions and 7 deletions
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13
src/video/SDL_pixels.c
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@ -1238,19 +1238,18 @@ SDL_PremultiplySurfaceAlphaToARGB8888(SDL_Surface *src, Uint32 *dst)
SDL_LockSurface(src);
for (y = 0; y < src->h; ++y) {
Uint8 *src_px = (Uint8*)(src->pixels) + (y * src->pitch);
Uint32 *src_px = (Uint32*)((Uint8 *)src->pixels + (y * src->pitch));
for (x = 0; x < src->w; ++x) {
/* Component bytes extraction. */
SDL_GetRGBA(*(Uint32*)src_px, src->format, &R, &G, &B, &A);
src_px += src->format->BytesPerPixel;
SDL_GetRGBA(*src_px++, src->format, &R, &G, &B, &A);
/* Alpha pre-multiplication of each component. */
R = (float)A * ((float)R /255);
G = (float)A * ((float)G /255);
B = (float)A * ((float)B /255);
R = ((Uint32)A * R) / 255;
G = ((Uint32)A * G) / 255;
B = ((Uint32)A * B) / 255;
/* ARGB8888 pixel recomposition. */
(*dst++) = (((Uint32)A << 24) | ((Uint32)R << 16) | ((Uint32)G << 8)) | ((Uint32)B << 0);
*dst++ = (((Uint32)A << 24) | ((Uint32)R << 16) | ((Uint32)G << 8) | (B << 0));
}
}
if (SDL_MUSTLOCK(src))