Mercurial > sdl-ios-xcode
view src/video/SDL_blit_copy.c @ 2334:80ceefc00ada gsoc2008_iphone
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author | Holmes Futrell <hfutrell@umail.ucsb.edu> |
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date | Fri, 11 Jul 2008 00:21:45 +0000 |
parents | c785543d1843 |
children | cc15254e44b6 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga 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" #include "SDL_blit_copy.h" #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__ */ #ifdef __MMX__ /* This assumes 8-byte aligned src and dst */ static __inline__ void SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len) { int i; __m64 values[8]; for (i = len / 64; i--;) { _mm_prefetch(src, _MM_HINT_NTA); 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]); src += 64; dst += 64; } if (len & 63) SDL_memcpy(dst, src, len & 63); } #endif /* __MMX__ */ void SDL_BlitCopy(SDL_BlitInfo * info) { Uint8 *src, *dst; int w, h; int srcskip, dstskip; w = info->dst_w * info->dst_fmt->BytesPerPixel; h = info->dst_h; src = info->src; dst = info->dst; srcskip = info->src_pitch; dstskip = info->dst_pitch; #ifdef __SSE__ if (SDL_HasSSE() && !((uintptr_t) src & 15) && !((uintptr_t) dst & 15)) { while (h--) { SDL_memcpySSE(dst, src, w); src += srcskip; dst += dstskip; } return; } #endif #ifdef __MMX__ if (SDL_HasMMX() && !((uintptr_t) src & 7) && !((uintptr_t) dst & 7)) { while (h--) { SDL_memcpyMMX(dst, src, w); src += srcskip; dst += dstskip; } _mm_empty(); return; } #endif while (h--) { SDL_memcpy(dst, src, w); src += srcskip; dst += dstskip; } } void SDL_BlitCopyOverlap(SDL_BlitInfo * info) { Uint8 *src, *dst; int w, h; int skip; w = info->dst_w * info->dst_fmt->BytesPerPixel; h = info->dst_h; src = info->src; dst = info->dst; skip = info->src_pitch; if ((dst < src) || (dst >= (src + h * skip))) { SDL_BlitCopy(info); } else { src += ((h - 1) * skip); dst += ((h - 1) * skip); while (h--) { SDL_revcpy(dst, src, w); src -= skip; dst -= skip; } } } /* vi: set ts=4 sw=4 expandtab: */