361 lines
9.2 KiB
C
361 lines
9.2 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_RLEaccel_c.h"
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#include "SDL_pixels_c.h"
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
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#define MMX_ASMBLIT
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#if (__GNUC__ > 2) /* SSE instructions aren't in GCC 2. */
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#define SSE_ASMBLIT
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#endif
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#endif
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#if defined(MMX_ASMBLIT)
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#include "SDL_cpuinfo.h"
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#include "mmx.h"
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#endif
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/* The general purpose software blit routine */
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static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
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SDL_Surface *dst, SDL_Rect *dstrect)
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{
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int okay;
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int src_locked;
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int dst_locked;
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/* Everything is okay at the beginning... */
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okay = 1;
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/* Lock the destination if it's in hardware */
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dst_locked = 0;
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if ( SDL_MUSTLOCK(dst) ) {
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if ( SDL_LockSurface(dst) < 0 ) {
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okay = 0;
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} else {
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dst_locked = 1;
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}
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}
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/* Lock the source if it's in hardware */
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src_locked = 0;
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if ( SDL_MUSTLOCK(src) ) {
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if ( SDL_LockSurface(src) < 0 ) {
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okay = 0;
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} else {
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src_locked = 1;
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}
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}
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/* Set up source and destination buffer pointers, and BLIT! */
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if ( okay && srcrect->w && srcrect->h ) {
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SDL_BlitInfo info;
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SDL_loblit RunBlit;
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/* Set up the blit information */
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info.s_pixels = (Uint8 *)src->pixels +
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(Uint16)srcrect->y*src->pitch +
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(Uint16)srcrect->x*src->format->BytesPerPixel;
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info.s_width = srcrect->w;
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info.s_height = srcrect->h;
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info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
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info.d_pixels = (Uint8 *)dst->pixels +
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(Uint16)dstrect->y*dst->pitch +
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(Uint16)dstrect->x*dst->format->BytesPerPixel;
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info.d_width = dstrect->w;
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info.d_height = dstrect->h;
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info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
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info.aux_data = src->map->sw_data->aux_data;
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info.src = src->format;
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info.table = src->map->table;
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info.dst = dst->format;
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RunBlit = src->map->sw_data->blit;
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/* Run the actual software blit */
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RunBlit(&info);
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}
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/* We need to unlock the surfaces if they're locked */
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if ( dst_locked ) {
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SDL_UnlockSurface(dst);
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}
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if ( src_locked ) {
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SDL_UnlockSurface(src);
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}
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/* Blit is done! */
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return(okay ? 0 : -1);
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}
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#ifdef MMX_ASMBLIT
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static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
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{
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int i;
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for(i=0; i<len/8; i++) {
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__asm__ __volatile__ (
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" movq (%0), %%mm0\n"
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" movq %%mm0, (%1)\n"
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: : "r" (from), "r" (to) : "memory");
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from+=8;
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to+=8;
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}
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if (len&7)
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SDL_memcpy(to, from, len&7);
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}
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#ifdef SSE_ASMBLIT
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static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
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{
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int i;
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__asm__ __volatile__ (
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" prefetchnta (%0)\n"
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" prefetchnta 64(%0)\n"
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" prefetchnta 128(%0)\n"
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" prefetchnta 192(%0)\n"
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: : "r" (from) );
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for(i=0; i<len/8; i++) {
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__asm__ __volatile__ (
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" prefetchnta 256(%0)\n"
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" movq (%0), %%mm0\n"
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" movntq %%mm0, (%1)\n"
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: : "r" (from), "r" (to) : "memory");
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from+=8;
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to+=8;
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}
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if (len&7)
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SDL_memcpy(to, from, len&7);
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}
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#endif
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#endif
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static void SDL_BlitCopy(SDL_BlitInfo *info)
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{
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Uint8 *src, *dst;
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int w, h;
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int srcskip, dstskip;
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w = info->d_width*info->dst->BytesPerPixel;
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h = info->d_height;
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src = info->s_pixels;
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dst = info->d_pixels;
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srcskip = w+info->s_skip;
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dstskip = w+info->d_skip;
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#ifdef SSE_ASMBLIT
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if(SDL_HasSSE())
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{
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while ( h-- ) {
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SDL_memcpySSE(dst, src, w);
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src += srcskip;
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dst += dstskip;
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}
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__asm__ __volatile__ (
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" emms\n"
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::);
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}
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else
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#endif
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#ifdef MMX_ASMBLIT
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if(SDL_HasMMX())
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{
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while ( h-- ) {
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SDL_memcpyMMX(dst, src, w);
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src += srcskip;
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dst += dstskip;
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}
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__asm__ __volatile__ (
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" emms\n"
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::);
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}
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else
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#endif
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while ( h-- ) {
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SDL_memcpy(dst, src, w);
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src += srcskip;
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dst += dstskip;
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}
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}
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static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
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{
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Uint8 *src, *dst;
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int w, h;
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int srcskip, dstskip;
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w = info->d_width*info->dst->BytesPerPixel;
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h = info->d_height;
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src = info->s_pixels;
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dst = info->d_pixels;
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srcskip = w+info->s_skip;
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dstskip = w+info->d_skip;
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if ( dst < src ) {
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while ( h-- ) {
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SDL_memcpy(dst, src, w);
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src += srcskip;
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dst += dstskip;
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}
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} else {
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src += ((h-1) * srcskip);
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dst += ((h-1) * dstskip);
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while ( h-- ) {
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SDL_revcpy(dst, src, w);
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src -= srcskip;
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dst -= dstskip;
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}
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}
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}
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/* Figure out which of many blit routines to set up on a surface */
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int SDL_CalculateBlit(SDL_Surface *surface)
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{
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int blit_index;
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/* Clean everything out to start */
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if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
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SDL_UnRLESurface(surface, 1);
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}
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surface->map->sw_blit = NULL;
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/* Figure out if an accelerated hardware blit is possible */
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surface->flags &= ~SDL_HWACCEL;
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if ( surface->map->identity ) {
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int hw_blit_ok;
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if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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/* We only support accelerated blitting to hardware */
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if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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hw_blit_ok = current_video->info.blit_hw;
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} else {
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hw_blit_ok = 0;
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}
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if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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hw_blit_ok = current_video->info.blit_hw_CC;
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}
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if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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hw_blit_ok = current_video->info.blit_hw_A;
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}
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} else {
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/* We only support accelerated blitting to hardware */
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if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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hw_blit_ok = current_video->info.blit_sw;
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} else {
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hw_blit_ok = 0;
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}
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if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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hw_blit_ok = current_video->info.blit_sw_CC;
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}
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if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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hw_blit_ok = current_video->info.blit_sw_A;
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}
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}
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if ( hw_blit_ok ) {
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SDL_VideoDevice *video = current_video;
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SDL_VideoDevice *this = current_video;
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video->CheckHWBlit(this, surface, surface->map->dst);
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}
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}
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/* if an alpha pixel format is specified, we can accelerate alpha blits */
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if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
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{
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if ( (surface->flags & SDL_SRCALPHA) )
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if ( current_video->info.blit_hw_A ) {
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SDL_VideoDevice *video = current_video;
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SDL_VideoDevice *this = current_video;
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video->CheckHWBlit(this, surface, surface->map->dst);
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}
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}
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/* Get the blit function index, based on surface mode */
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/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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blit_index = 0;
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blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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if ( surface->flags & SDL_SRCALPHA
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&& (surface->format->alpha != SDL_ALPHA_OPAQUE
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|| surface->format->Amask) ) {
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blit_index |= 2;
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}
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/* Check for special "identity" case -- copy blit */
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if ( surface->map->identity && blit_index == 0 ) {
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surface->map->sw_data->blit = SDL_BlitCopy;
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/* Handle overlapping blits on the same surface */
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if ( surface == surface->map->dst ) {
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surface->map->sw_data->blit = SDL_BlitCopyOverlap;
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}
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} else {
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if ( surface->format->BitsPerPixel < 8 ) {
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surface->map->sw_data->blit =
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SDL_CalculateBlit0(surface, blit_index);
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} else {
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switch ( surface->format->BytesPerPixel ) {
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case 1:
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surface->map->sw_data->blit =
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SDL_CalculateBlit1(surface, blit_index);
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break;
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case 2:
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case 3:
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case 4:
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surface->map->sw_data->blit =
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SDL_CalculateBlitN(surface, blit_index);
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break;
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default:
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surface->map->sw_data->blit = NULL;
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break;
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}
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}
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}
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/* Make sure we have a blit function */
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if ( surface->map->sw_data->blit == NULL ) {
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SDL_InvalidateMap(surface->map);
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SDL_SetError("Blit combination not supported");
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return(-1);
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}
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/* Choose software blitting function */
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if(surface->flags & SDL_RLEACCELOK
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&& (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
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if(surface->map->identity
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&& (blit_index == 1
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|| (blit_index == 3 && !surface->format->Amask))) {
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if ( SDL_RLESurface(surface) == 0 )
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surface->map->sw_blit = SDL_RLEBlit;
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} else if(blit_index == 2 && surface->format->Amask) {
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if ( SDL_RLESurface(surface) == 0 )
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surface->map->sw_blit = SDL_RLEAlphaBlit;
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}
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}
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if ( surface->map->sw_blit == NULL ) {
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surface->map->sw_blit = SDL_SoftBlit;
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}
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return(0);
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}
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