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SDL_blit_copy.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
#include "SDL_blit.h"
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#include "SDL_blit_copy.h"
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#ifdef __SSE__
/* This assumes 16-byte aligned src and dst */
static __inline__ void
SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)
{
int i;
__m128 values[4];
for (i = len / 64; i--;) {
_mm_prefetch(src, _MM_HINT_NTA);
values[0] = *(__m128 *) (src + 0);
values[1] = *(__m128 *) (src + 16);
values[2] = *(__m128 *) (src + 32);
values[3] = *(__m128 *) (src + 48);
_mm_stream_ps((float *) (dst + 0), values[0]);
_mm_stream_ps((float *) (dst + 16), values[1]);
_mm_stream_ps((float *) (dst + 32), values[2]);
_mm_stream_ps((float *) (dst + 48), values[3]);
src += 64;
dst += 64;
}
if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __SSE__ */
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#ifdef _MSC_VER
#pragma warning(disable:4799)
#endif
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/* This assumes 8-byte aligned src and dst */
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static __inline__ void
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SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)
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__m64 values[8];
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for (i = len / 64; i--;) {
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#ifdef __SSE__
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_mm_prefetch(src, _MM_HINT_NTA);
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#endif
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values[0] = *(__m64 *) (src + 0);
values[1] = *(__m64 *) (src + 8);
values[2] = *(__m64 *) (src + 16);
values[3] = *(__m64 *) (src + 24);
values[4] = *(__m64 *) (src + 32);
values[5] = *(__m64 *) (src + 40);
values[6] = *(__m64 *) (src + 48);
values[7] = *(__m64 *) (src + 56);
_mm_stream_pi((__m64 *) (dst + 0), values[0]);
_mm_stream_pi((__m64 *) (dst + 8), values[1]);
_mm_stream_pi((__m64 *) (dst + 16), values[2]);
_mm_stream_pi((__m64 *) (dst + 24), values[3]);
_mm_stream_pi((__m64 *) (dst + 32), values[4]);
_mm_stream_pi((__m64 *) (dst + 40), values[5]);
_mm_stream_pi((__m64 *) (dst + 48), values[6]);
_mm_stream_pi((__m64 *) (dst + 56), values[7]);
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src += 64;
dst += 64;
}
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if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __MMX__ */
void
SDL_BlitCopy(SDL_BlitInfo * info)
{
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SDL_bool overlap;
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Uint8 *src, *dst;
int w, h;
int srcskip, dstskip;
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w = info->dst_w * info->dst_fmt->BytesPerPixel;
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h = info->dst_h;
src = info->src;
dst = info->dst;
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srcskip = info->src_pitch;
dstskip = info->dst_pitch;
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/* Properly handle overlapping blits */
if (src < dst) {
overlap = (dst < (src + h*srcskip));
} else {
overlap = (src < (dst + h*dstskip));
}
if (overlap) {
while (h--) {
SDL_memmove(dst, src, w);
src += srcskip;
dst += dstskip;
}
return;
}
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if (SDL_HasSSE() &&
!((uintptr_t) src & 15) && !(srcskip & 15) &&
!((uintptr_t) dst & 15) && !(dstskip & 15)) {
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while (h--) {
SDL_memcpySSE(dst, src, w);
src += srcskip;
dst += dstskip;
}
return;
}
#endif
#ifdef __MMX__
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if (SDL_HasMMX() &&
!((uintptr_t) src & 7) && !(srcskip & 7) &&
!((uintptr_t) dst & 7) && !(dstskip & 7)) {
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while (h--) {
SDL_memcpyMMX(dst, src, w);
src += srcskip;
dst += dstskip;
}
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_mm_empty();
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return;
}
#endif
while (h--) {
SDL_memcpy(dst, src, w);
src += srcskip;
dst += dstskip;
}
}
/* vi: set ts=4 sw=4 expandtab: */