627 lines
16 KiB
C
627 lines
16 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 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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/* General (mostly internal) pixel/color manipulation routines for SDL */
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#include "SDL_endian.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_pixels_c.h"
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#include "SDL_RLEaccel_c.h"
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/* Helper functions */
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/*
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* Allocate a pixel format structure and fill it according to the given info.
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*/
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SDL_PixelFormat *SDL_AllocFormat(int bpp,
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Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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{
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SDL_PixelFormat *format;
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Uint32 mask;
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/* Allocate an empty pixel format structure */
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format = SDL_malloc(sizeof(*format));
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if ( format == NULL ) {
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SDL_OutOfMemory();
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return(NULL);
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}
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SDL_memset(format, 0, sizeof(*format));
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format->alpha = SDL_ALPHA_OPAQUE;
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/* Set up the format */
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format->BitsPerPixel = bpp;
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format->BytesPerPixel = (bpp+7)/8;
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if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */
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format->palette = NULL;
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format->Rshift = 0;
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format->Rloss = 8;
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if ( Rmask ) {
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for ( mask = Rmask; !(mask&0x01); mask >>= 1 )
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++format->Rshift;
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for ( ; (mask&0x01); mask >>= 1 )
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--format->Rloss;
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}
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format->Gshift = 0;
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format->Gloss = 8;
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if ( Gmask ) {
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for ( mask = Gmask; !(mask&0x01); mask >>= 1 )
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++format->Gshift;
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for ( ; (mask&0x01); mask >>= 1 )
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--format->Gloss;
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}
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format->Bshift = 0;
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format->Bloss = 8;
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if ( Bmask ) {
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for ( mask = Bmask; !(mask&0x01); mask >>= 1 )
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++format->Bshift;
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for ( ; (mask&0x01); mask >>= 1 )
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--format->Bloss;
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}
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format->Ashift = 0;
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format->Aloss = 8;
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if ( Amask ) {
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for ( mask = Amask; !(mask&0x01); mask >>= 1 )
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++format->Ashift;
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for ( ; (mask&0x01); mask >>= 1 )
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--format->Aloss;
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}
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format->Rmask = Rmask;
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format->Gmask = Gmask;
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format->Bmask = Bmask;
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format->Amask = Amask;
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} else if ( bpp > 8 ) { /* Packed pixels with standard mask */
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/* R-G-B */
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if ( bpp > 24 )
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bpp = 24;
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format->Rloss = 8-(bpp/3);
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format->Gloss = 8-(bpp/3)-(bpp%3);
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format->Bloss = 8-(bpp/3);
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format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3);
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format->Gshift = (bpp/3);
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format->Bshift = 0;
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format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift);
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format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift);
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format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift);
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} else {
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/* Palettized formats have no mask info */
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format->Rloss = 8;
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format->Gloss = 8;
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format->Bloss = 8;
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format->Aloss = 8;
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format->Rshift = 0;
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format->Gshift = 0;
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format->Bshift = 0;
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format->Ashift = 0;
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format->Rmask = 0;
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format->Gmask = 0;
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format->Bmask = 0;
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format->Amask = 0;
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}
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if ( bpp <= 8 ) { /* Palettized mode */
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int ncolors = 1<<bpp;
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#ifdef DEBUG_PALETTE
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fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors);
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#endif
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format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette));
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if ( format->palette == NULL ) {
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SDL_FreeFormat(format);
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SDL_OutOfMemory();
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return(NULL);
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}
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(format->palette)->ncolors = ncolors;
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(format->palette)->colors = (SDL_Color *)SDL_malloc(
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(format->palette)->ncolors*sizeof(SDL_Color));
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if ( (format->palette)->colors == NULL ) {
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SDL_FreeFormat(format);
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SDL_OutOfMemory();
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return(NULL);
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}
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if ( Rmask || Bmask || Gmask ) {
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/* create palette according to masks */
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int i;
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int Rm=0,Gm=0,Bm=0;
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int Rw=0,Gw=0,Bw=0;
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#ifdef ENABLE_PALETTE_ALPHA
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int Am=0,Aw=0;
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#endif
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if(Rmask)
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{
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Rw=8-format->Rloss;
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for(i=format->Rloss;i>0;i-=Rw)
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Rm|=1<<i;
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}
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#ifdef DEBUG_PALETTE
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fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm);
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#endif
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if(Gmask)
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{
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Gw=8-format->Gloss;
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for(i=format->Gloss;i>0;i-=Gw)
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Gm|=1<<i;
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}
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#ifdef DEBUG_PALETTE
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fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm);
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#endif
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if(Bmask)
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{
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Bw=8-format->Bloss;
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for(i=format->Bloss;i>0;i-=Bw)
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Bm|=1<<i;
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}
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#ifdef DEBUG_PALETTE
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fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm);
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#endif
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#ifdef ENABLE_PALETTE_ALPHA
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if(Amask)
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{
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Aw=8-format->Aloss;
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for(i=format->Aloss;i>0;i-=Aw)
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Am|=1<<i;
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}
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# ifdef DEBUG_PALETTE
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fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am);
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# endif
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#endif
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for(i=0; i < ncolors; ++i) {
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int r,g,b;
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r=(i&Rmask)>>format->Rshift;
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r=(r<<format->Rloss)|((r*Rm)>>Rw);
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format->palette->colors[i].r=r;
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g=(i&Gmask)>>format->Gshift;
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g=(g<<format->Gloss)|((g*Gm)>>Gw);
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format->palette->colors[i].g=g;
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b=(i&Bmask)>>format->Bshift;
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b=(b<<format->Bloss)|((b*Bm)>>Bw);
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format->palette->colors[i].b=b;
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#ifdef ENABLE_PALETTE_ALPHA
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a=(i&Amask)>>format->Ashift;
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a=(a<<format->Aloss)|((a*Am)>>Aw);
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format->palette->colors[i].unused=a;
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#else
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format->palette->colors[i].unused=0;
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#endif
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}
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} else if ( ncolors == 2 ) {
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/* Create a black and white bitmap palette */
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format->palette->colors[0].r = 0xFF;
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format->palette->colors[0].g = 0xFF;
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format->palette->colors[0].b = 0xFF;
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format->palette->colors[1].r = 0x00;
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format->palette->colors[1].g = 0x00;
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format->palette->colors[1].b = 0x00;
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} else {
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/* Create an empty palette */
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SDL_memset((format->palette)->colors, 0,
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(format->palette)->ncolors*sizeof(SDL_Color));
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}
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}
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return(format);
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}
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SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
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Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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{
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if ( surface->format ) {
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SDL_FreeFormat(surface->format);
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SDL_FormatChanged(surface);
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}
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surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
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return surface->format;
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}
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/*
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* Change any previous mappings from/to the new surface format
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*/
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void SDL_FormatChanged(SDL_Surface *surface)
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{
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static int format_version = 0;
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++format_version;
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if ( format_version < 0 ) { /* It wrapped... */
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format_version = 1;
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}
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surface->format_version = format_version;
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SDL_InvalidateMap(surface->map);
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}
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/*
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* Free a previously allocated format structure
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*/
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void SDL_FreeFormat(SDL_PixelFormat *format)
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{
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if ( format ) {
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if ( format->palette ) {
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if ( format->palette->colors ) {
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SDL_free(format->palette->colors);
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}
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SDL_free(format->palette);
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}
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SDL_free(format);
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}
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}
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/*
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* Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
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*/
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void SDL_DitherColors(SDL_Color *colors, int bpp)
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{
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int i;
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if(bpp != 8)
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return; /* only 8bpp supported right now */
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for(i = 0; i < 256; i++) {
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int r, g, b;
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/* map each bit field to the full [0, 255] interval,
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so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
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r = i & 0xe0;
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r |= r >> 3 | r >> 6;
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colors[i].r = r;
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g = (i << 3) & 0xe0;
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g |= g >> 3 | g >> 6;
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colors[i].g = g;
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b = i & 0x3;
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b |= b << 2;
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b |= b << 4;
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colors[i].b = b;
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}
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}
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/*
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* Calculate the pad-aligned scanline width of a surface
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*/
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Uint16 SDL_CalculatePitch(SDL_Surface *surface)
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{
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Uint16 pitch;
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/* Surface should be 4-byte aligned for speed */
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pitch = surface->w*surface->format->BytesPerPixel;
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switch (surface->format->BitsPerPixel) {
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case 1:
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pitch = (pitch+7)/8;
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break;
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case 4:
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pitch = (pitch+1)/2;
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break;
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default:
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break;
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}
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pitch = (pitch + 3) & ~3; /* 4-byte aligning */
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return(pitch);
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}
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/*
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* Match an RGB value to a particular palette index
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*/
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Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b)
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{
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/* Do colorspace distance matching */
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unsigned int smallest;
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unsigned int distance;
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int rd, gd, bd;
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int i;
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Uint8 pixel=0;
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smallest = ~0;
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for ( i=0; i<pal->ncolors; ++i ) {
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rd = pal->colors[i].r - r;
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gd = pal->colors[i].g - g;
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bd = pal->colors[i].b - b;
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distance = (rd*rd)+(gd*gd)+(bd*bd);
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if ( distance < smallest ) {
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pixel = i;
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if ( distance == 0 ) { /* Perfect match! */
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break;
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}
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smallest = distance;
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}
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}
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return(pixel);
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}
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/* Find the opaque pixel value corresponding to an RGB triple */
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Uint32 SDL_MapRGB
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(const SDL_PixelFormat * const format,
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const Uint8 r, const Uint8 g, const Uint8 b)
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{
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if ( format->palette == NULL ) {
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return (r >> format->Rloss) << format->Rshift
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| (g >> format->Gloss) << format->Gshift
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| (b >> format->Bloss) << format->Bshift
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| format->Amask;
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} else {
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return SDL_FindColor(format->palette, r, g, b);
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}
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}
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/* Find the pixel value corresponding to an RGBA quadruple */
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Uint32 SDL_MapRGBA
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(const SDL_PixelFormat * const format,
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const Uint8 r, const Uint8 g, const Uint8 b, const Uint8 a)
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{
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if ( format->palette == NULL ) {
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return (r >> format->Rloss) << format->Rshift
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| (g >> format->Gloss) << format->Gshift
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| (b >> format->Bloss) << format->Bshift
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| ((a >> format->Aloss) << format->Ashift & format->Amask);
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} else {
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return SDL_FindColor(format->palette, r, g, b);
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}
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}
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void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * const fmt,
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Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
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{
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if ( fmt->palette == NULL ) {
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/*
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* This makes sure that the result is mapped to the
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* interval [0..255], and the maximum value for each
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* component is 255. This is important to make sure
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* that white is indeed reported as (255, 255, 255),
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* and that opaque alpha is 255.
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* This only works for RGB bit fields at least 4 bit
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* wide, which is almost always the case.
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*/
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unsigned v;
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v = (pixel & fmt->Rmask) >> fmt->Rshift;
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*r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
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v = (pixel & fmt->Gmask) >> fmt->Gshift;
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*g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
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v = (pixel & fmt->Bmask) >> fmt->Bshift;
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*b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
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if(fmt->Amask) {
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v = (pixel & fmt->Amask) >> fmt->Ashift;
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*a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
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} else {
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*a = SDL_ALPHA_OPAQUE;
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}
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} else {
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*r = fmt->palette->colors[pixel].r;
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*g = fmt->palette->colors[pixel].g;
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*b = fmt->palette->colors[pixel].b;
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*a = SDL_ALPHA_OPAQUE;
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}
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}
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void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * const fmt,
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Uint8 *r,Uint8 *g,Uint8 *b)
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{
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if ( fmt->palette == NULL ) {
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/* the note for SDL_GetRGBA above applies here too */
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unsigned v;
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v = (pixel & fmt->Rmask) >> fmt->Rshift;
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*r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1)));
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v = (pixel & fmt->Gmask) >> fmt->Gshift;
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*g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1)));
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v = (pixel & fmt->Bmask) >> fmt->Bshift;
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*b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1)));
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} else {
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*r = fmt->palette->colors[pixel].r;
|
||
|
*g = fmt->palette->colors[pixel].g;
|
||
|
*b = fmt->palette->colors[pixel].b;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Apply gamma to a set of colors - this is easy. :) */
|
||
|
void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
|
||
|
int ncolors)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
for ( i=0; i<ncolors; ++i ) {
|
||
|
output[i].r = gamma[0*256 + colors[i].r] >> 8;
|
||
|
output[i].g = gamma[1*256 + colors[i].g] >> 8;
|
||
|
output[i].b = gamma[2*256 + colors[i].b] >> 8;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Map from Palette to Palette */
|
||
|
static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
|
||
|
{
|
||
|
Uint8 *map;
|
||
|
int i;
|
||
|
|
||
|
if ( identical ) {
|
||
|
if ( src->ncolors <= dst->ncolors ) {
|
||
|
/* If an identical palette, no need to map */
|
||
|
if ( SDL_memcmp(src->colors, dst->colors, src->ncolors*
|
||
|
sizeof(SDL_Color)) == 0 ) {
|
||
|
*identical = 1;
|
||
|
return(NULL);
|
||
|
}
|
||
|
}
|
||
|
*identical = 0;
|
||
|
}
|
||
|
map = (Uint8 *)SDL_malloc(src->ncolors);
|
||
|
if ( map == NULL ) {
|
||
|
SDL_OutOfMemory();
|
||
|
return(NULL);
|
||
|
}
|
||
|
for ( i=0; i<src->ncolors; ++i ) {
|
||
|
map[i] = SDL_FindColor(dst,
|
||
|
src->colors[i].r, src->colors[i].g, src->colors[i].b);
|
||
|
}
|
||
|
return(map);
|
||
|
}
|
||
|
/* Map from Palette to BitField */
|
||
|
static Uint8 *Map1toN(SDL_PixelFormat *src, SDL_PixelFormat *dst)
|
||
|
{
|
||
|
Uint8 *map;
|
||
|
int i;
|
||
|
int bpp;
|
||
|
unsigned alpha;
|
||
|
SDL_Palette *pal = src->palette;
|
||
|
|
||
|
bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
|
||
|
map = (Uint8 *)SDL_malloc(pal->ncolors*bpp);
|
||
|
if ( map == NULL ) {
|
||
|
SDL_OutOfMemory();
|
||
|
return(NULL);
|
||
|
}
|
||
|
|
||
|
alpha = dst->Amask ? src->alpha : 0;
|
||
|
/* We memory copy to the pixel map so the endianness is preserved */
|
||
|
for ( i=0; i<pal->ncolors; ++i ) {
|
||
|
ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
|
||
|
pal->colors[i].r, pal->colors[i].g,
|
||
|
pal->colors[i].b, alpha);
|
||
|
}
|
||
|
return(map);
|
||
|
}
|
||
|
/* Map from BitField to Dithered-Palette to Palette */
|
||
|
static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical)
|
||
|
{
|
||
|
/* Generate a 256 color dither palette */
|
||
|
SDL_Palette dithered;
|
||
|
SDL_Color colors[256];
|
||
|
SDL_Palette *pal = dst->palette;
|
||
|
|
||
|
/* SDL_DitherColors does not initialize the 'unused' component of colors,
|
||
|
but Map1to1 compares it against pal, so we should initialize it. */
|
||
|
SDL_memset(colors, 0, sizeof(colors));
|
||
|
|
||
|
dithered.ncolors = 256;
|
||
|
SDL_DitherColors(colors, 8);
|
||
|
dithered.colors = colors;
|
||
|
return(Map1to1(&dithered, pal, identical));
|
||
|
}
|
||
|
|
||
|
SDL_BlitMap *SDL_AllocBlitMap(void)
|
||
|
{
|
||
|
SDL_BlitMap *map;
|
||
|
|
||
|
/* Allocate the empty map */
|
||
|
map = (SDL_BlitMap *)SDL_malloc(sizeof(*map));
|
||
|
if ( map == NULL ) {
|
||
|
SDL_OutOfMemory();
|
||
|
return(NULL);
|
||
|
}
|
||
|
SDL_memset(map, 0, sizeof(*map));
|
||
|
|
||
|
/* Allocate the software blit data */
|
||
|
map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data));
|
||
|
if ( map->sw_data == NULL ) {
|
||
|
SDL_FreeBlitMap(map);
|
||
|
SDL_OutOfMemory();
|
||
|
return(NULL);
|
||
|
}
|
||
|
SDL_memset(map->sw_data, 0, sizeof(*map->sw_data));
|
||
|
|
||
|
/* It's ready to go */
|
||
|
return(map);
|
||
|
}
|
||
|
void SDL_InvalidateMap(SDL_BlitMap *map)
|
||
|
{
|
||
|
if ( ! map ) {
|
||
|
return;
|
||
|
}
|
||
|
map->dst = NULL;
|
||
|
map->format_version = (unsigned int)-1;
|
||
|
if ( map->table ) {
|
||
|
SDL_free(map->table);
|
||
|
map->table = NULL;
|
||
|
}
|
||
|
}
|
||
|
int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
|
||
|
{
|
||
|
SDL_PixelFormat *srcfmt;
|
||
|
SDL_PixelFormat *dstfmt;
|
||
|
SDL_BlitMap *map;
|
||
|
|
||
|
/* Clear out any previous mapping */
|
||
|
map = src->map;
|
||
|
if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
|
||
|
SDL_UnRLESurface(src, 1);
|
||
|
}
|
||
|
SDL_InvalidateMap(map);
|
||
|
|
||
|
/* Figure out what kind of mapping we're doing */
|
||
|
map->identity = 0;
|
||
|
srcfmt = src->format;
|
||
|
dstfmt = dst->format;
|
||
|
switch (srcfmt->BytesPerPixel) {
|
||
|
case 1:
|
||
|
switch (dstfmt->BytesPerPixel) {
|
||
|
case 1:
|
||
|
/* Palette --> Palette */
|
||
|
/* If both SDL_HWSURFACE, assume have same palette */
|
||
|
if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
|
||
|
((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
|
||
|
map->identity = 1;
|
||
|
} else {
|
||
|
map->table = Map1to1(srcfmt->palette,
|
||
|
dstfmt->palette, &map->identity);
|
||
|
}
|
||
|
if ( ! map->identity ) {
|
||
|
if ( map->table == NULL ) {
|
||
|
return(-1);
|
||
|
}
|
||
|
}
|
||
|
if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
|
||
|
map->identity = 0;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
/* Palette --> BitField */
|
||
|
map->table = Map1toN(srcfmt, dstfmt);
|
||
|
if ( map->table == NULL ) {
|
||
|
return(-1);
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
break;
|
||
|
default:
|
||
|
switch (dstfmt->BytesPerPixel) {
|
||
|
case 1:
|
||
|
/* BitField --> Palette */
|
||
|
map->table = MapNto1(srcfmt, dstfmt, &map->identity);
|
||
|
if ( ! map->identity ) {
|
||
|
if ( map->table == NULL ) {
|
||
|
return(-1);
|
||
|
}
|
||
|
}
|
||
|
map->identity = 0; /* Don't optimize to copy */
|
||
|
break;
|
||
|
default:
|
||
|
/* BitField --> BitField */
|
||
|
if ( FORMAT_EQUAL(srcfmt, dstfmt) )
|
||
|
map->identity = 1;
|
||
|
break;
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
map->dst = dst;
|
||
|
map->format_version = dst->format_version;
|
||
|
|
||
|
/* Choose your blitters wisely */
|
||
|
return(SDL_CalculateBlit(src));
|
||
|
}
|
||
|
void SDL_FreeBlitMap(SDL_BlitMap *map)
|
||
|
{
|
||
|
if ( map ) {
|
||
|
SDL_InvalidateMap(map);
|
||
|
if ( map->sw_data != NULL ) {
|
||
|
SDL_free(map->sw_data);
|
||
|
}
|
||
|
SDL_free(map);
|
||
|
}
|
||
|
}
|