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blit.c: Implement flip/rotate for x64 (Fix baby pacman) #401

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Jan 4, 2025
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blit.c: Implement flip/rotate for x64 (Fix baby pacman) #401

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17 changes: 10 additions & 7 deletions src/windows/blit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -608,23 +608,26 @@ int win_perform_blit(const struct win_blit_params * const blit, int update)
if (blit->dstyscale > 1) //!! due to hack above, make bottom black
memset(dst, 0, blit->dstpitch*(asmblit_srcheight / 2));
#else
UINT32 c;
const UINT8 * __restrict src = asmblit_srcdata;
UINT8 * __restrict dst = asmblit_dstdata;

for (c = 0; c < asmblit_srcheight; ++c)
INT32 valuefixups[32]; // asm rely on 32 bit register arithmetic, we reuse the same 'fixup' values but need them as signed values for x64
compute_source_fixups(blit, (UINT32*)valuefixups);

for (int c = 0; c < blit_srcheight; ++c) // y loop
{
int c2,c2d=0;
for (c2 = 0; c2 < blit->srcwidth; ++c2)
const UINT8* __restrict pushed_src = src;
for (c2 = 0; c2 < blit_srcwidth; ++c2) // x loop
{
const UINT16 col = blit->srclookup[((UINT16*)src)[c2]];
int s;
for (s = 0; s < blit->dstxscale; ++s,++c2d)
const UINT16 col = blit->srclookup[*(UINT16*)src];
for (int s = 0; s < blit->dstxscale; ++s,++c2d)
((UINT16*)dst)[c2d] = col;
src += valuefixups[FIXUPVAL_SRCBYTES1];
}
for (c2 = 1; c2 < blit->dstyscale; ++c2)
memcpy(dst + blit->dstpitch*c2, dst, blit->dstpitch);
src += blit->srcpitch;
src = pushed_src + valuefixups[FIXUPVAL_SRCADVANCE];
dst += blit->dstpitch * blit->dstyscale;
}
#endif
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