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blit_slow: don't read destination pixel when you're going to discard it anyways

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(cherry picked from commit 4cd0c13823551cce279c9ff3d284c41c28deb3d8)
This commit is contained in:
Anonymous Maarten 2023-10-04 21:17:13 +02:00 committed by Sam Lantinga
parent 321c2f8f24
commit 2d5c05a69c
1 changed files with 13 additions and 8 deletions
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21
src/video/SDL_blit_slow.c
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@ -106,15 +106,20 @@ void SDL_Blit_Slow(SDL_BlitInfo *info)
continue;
}
}
if (FORMAT_HAS_ALPHA(dstfmt_val)) {
DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, dstB, dstA);
} else if (FORMAT_HAS_NO_ALPHA(dstfmt_val)) {
DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, dstB);
dstA = 0xFF;
if ((flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL))) {
if (FORMAT_HAS_ALPHA(dstfmt_val)) {
DISEMBLE_RGBA(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, dstB, dstA);
} else if (FORMAT_HAS_NO_ALPHA(dstfmt_val)) {
DISEMBLE_RGB(dst, dstbpp, dst_fmt, dstpixel, dstR, dstG, dstB);
dstA = 0xFF;
} else {
/* SDL_PIXELFORMAT_ARGB2101010 */
dstpixel = *((Uint32 *) (dst));
RGBA_FROM_ARGB2101010(dstpixel, dstR, dstG, dstB, dstA);
}
} else {
/* SDL_PIXELFORMAT_ARGB2101010 */
dstpixel = *((Uint32 *)(dst));
RGBA_FROM_ARGB2101010(dstpixel, dstR, dstG, dstB, dstA);
/* don't care */
dstR = dstG = dstB = dstA = 0;
}
if (flags & SDL_COPY_MODULATE_COLOR) {