src/video/SDL_pixels.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* General (mostly internal) pixel/color manipulation routines for SDL */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL_error.h"
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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 = 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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	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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	switch (bpp) {
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		case 1:
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			/* Create the 2 color black-white palette */
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			format->palette = (SDL_Palette *)malloc(
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							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 = 2;
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			(format->palette)->colors = (SDL_Color *)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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			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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			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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			break;
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		case 4:
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			/* Create the 16 color VGA palette */
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			format->palette = (SDL_Palette *)malloc(
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							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 = 16;
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			(format->palette)->colors = (SDL_Color *)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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			/* Punt for now, will this ever be used? */
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			memset((format->palette)->colors, 0,
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				(format->palette)->ncolors*sizeof(SDL_Color));
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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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			break;
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		case 8:
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			/* Create an empty 256 color palette */
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			format->palette = (SDL_Palette *)malloc(
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							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 = 256;
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			(format->palette)->colors = (SDL_Color *)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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			memset((format->palette)->colors, 0,
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				(format->palette)->ncolors*sizeof(SDL_Color));
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   157
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			/* Palettized formats have no mask info */
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   159
			format->Rloss = 8;
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   160
			format->Gloss = 8;
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   161
			format->Bloss = 8;
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   162
			format->Aloss = 8;
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   163
			format->Rshift = 0;
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   164
			format->Gshift = 0;
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   165
			format->Bshift = 0;
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   166
			format->Ashift = 0;
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   167
			format->Rmask = 0;
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   168
			format->Gmask = 0;
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   169
			format->Bmask = 0;
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   170
			format->Amask = 0;
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   171
			break;
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   172
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   173
		default:
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   174
			/* No palette, just packed pixel info */
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   175
			format->palette = NULL;
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   176
			format->Rshift = 0;
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   177
			format->Rloss = 8;
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   178
			if ( Rmask ) {
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   179
				for ( mask = Rmask; !(mask&0x01); mask >>= 1 )
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   180
					++format->Rshift;
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   181
				for ( ; (mask&0x01); mask >>= 1 )
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   182
					--format->Rloss;
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   183
			}
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   184
			format->Gshift = 0;
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   185
			format->Gloss = 8;
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   186
			if ( Gmask ) {
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   187
				for ( mask = Gmask; !(mask&0x01); mask >>= 1 )
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   188
					++format->Gshift;
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parents:
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   189
				for ( ; (mask&0x01); mask >>= 1 )
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   190
					--format->Gloss;
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parents:
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   191
			}
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   192
			format->Bshift = 0;
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   193
			format->Bloss = 8;
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   194
			if ( Bmask ) {
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   195
				for ( mask = Bmask; !(mask&0x01); mask >>= 1 )
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   196
					++format->Bshift;
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   197
				for ( ; (mask&0x01); mask >>= 1 )
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   198
					--format->Bloss;
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parents:
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   199
			}
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   200
			format->Ashift = 0;
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   201
			format->Aloss = 8;
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   202
			if ( Amask ) {
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   203
				for ( mask = Amask; !(mask&0x01); mask >>= 1 )
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   204
					++format->Ashift;
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   205
				for ( ; (mask&0x01); mask >>= 1 )
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parents:
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   206
					--format->Aloss;
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parents:
diff changeset
   207
			}
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   208
			format->Rmask = Rmask;
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parents:
diff changeset
   209
			format->Gmask = Gmask;
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parents:
diff changeset
   210
			format->Bmask = Bmask;
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parents:
diff changeset
   211
			format->Amask = Amask;
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   212
			break;
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parents:
diff changeset
   213
	}
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   214
	/* Calculate some standard bitmasks, if necessary 
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   215
	 * Note:  This could conflict with an alpha mask, if given.
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diff changeset
   216
	 */
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   217
	if ( (bpp > 8) && !format->Rmask && !format->Gmask && !format->Bmask ) {
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   218
		/* R-G-B */
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   219
		if ( bpp > 24 )
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   220
			bpp = 24;
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parents:
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   221
		format->Rloss = 8-(bpp/3);
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parents:
diff changeset
   222
		format->Gloss = 8-(bpp/3)-(bpp%3);
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parents:
diff changeset
   223
		format->Bloss = 8-(bpp/3);
74212992fb08 Initial revision
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parents:
diff changeset
   224
		format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3);
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parents:
diff changeset
   225
		format->Gshift = (bpp/3);
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parents:
diff changeset
   226
		format->Bshift = 0;
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parents:
diff changeset
   227
		format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift);
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parents:
diff changeset
   228
		format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift);
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parents:
diff changeset
   229
		format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift);
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parents:
diff changeset
   230
	}
74212992fb08 Initial revision
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parents:
diff changeset
   231
	return(format);
74212992fb08 Initial revision
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parents:
diff changeset
   232
}
74212992fb08 Initial revision
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parents:
diff changeset
   233
SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp,
74212992fb08 Initial revision
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parents:
diff changeset
   234
			Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
74212992fb08 Initial revision
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parents:
diff changeset
   235
{
74212992fb08 Initial revision
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parents:
diff changeset
   236
	if ( surface->format ) {
74212992fb08 Initial revision
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parents:
diff changeset
   237
		SDL_FreeFormat(surface->format);
74212992fb08 Initial revision
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parents:
diff changeset
   238
		SDL_FormatChanged(surface);
74212992fb08 Initial revision
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parents:
diff changeset
   239
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   240
	surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
74212992fb08 Initial revision
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parents:
diff changeset
   241
	return surface->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   242
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   243
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   244
/*
74212992fb08 Initial revision
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parents:
diff changeset
   245
 * Change any previous mappings from/to the new surface format
74212992fb08 Initial revision
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parents:
diff changeset
   246
 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   247
void SDL_FormatChanged(SDL_Surface *surface)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   248
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   249
	surface->format_version++;
74212992fb08 Initial revision
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parents:
diff changeset
   250
	SDL_InvalidateMap(surface->map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   251
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   252
/*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   253
 * Free a previously allocated format structure
74212992fb08 Initial revision
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parents:
diff changeset
   254
 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   255
void SDL_FreeFormat(SDL_PixelFormat *format)
74212992fb08 Initial revision
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parents:
diff changeset
   256
{
74212992fb08 Initial revision
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parents:
diff changeset
   257
	if ( format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   258
		if ( format->palette ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   259
			if ( format->palette->colors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   260
				free(format->palette->colors);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   261
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   262
			free(format->palette);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   263
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   264
		free(format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   265
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   266
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   267
/*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   268
 * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   269
 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   270
void SDL_DitherColors(SDL_Color *colors, int bpp)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   271
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   272
	int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   273
	if(bpp != 8)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   274
		return;		/* only 8bpp supported right now */
74212992fb08 Initial revision
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parents:
diff changeset
   275
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   276
	for(i = 0; i < 256; i++) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   277
		int r, g, b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   278
		/* map each bit field to the full [0, 255] interval,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   279
		   so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   280
		r = i & 0xe0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   281
		r |= r >> 3 | r >> 6;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   282
		colors[i].r = r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   283
		g = (i << 3) & 0xe0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   284
		g |= g >> 3 | g >> 6;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   285
		colors[i].g = g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   286
		b = i & 0x3;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   287
		b |= b << 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   288
		b |= b << 4;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   289
		colors[i].b = b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   290
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   291
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   292
/* 
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   293
 * Calculate the pad-aligned scanline width of a surface
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   294
 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   295
Uint16 SDL_CalculatePitch(SDL_Surface *surface)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   296
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   297
	Uint16 pitch;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   298
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   299
	/* Surface should be 4-byte aligned for speed */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   300
	pitch = surface->w*surface->format->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   301
	switch (surface->format->BitsPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   302
		case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   303
			pitch = (pitch+7)/8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   304
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   305
		case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   306
			pitch = (pitch+1)/2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   307
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   308
		default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   309
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   310
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   311
	pitch = (pitch + 3) & ~3;	/* 4-byte aligning */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   312
	return(pitch);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   313
}
74212992fb08 Initial revision
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   314
/*
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   315
 * Match an RGB value to a particular palette index
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   316
 */
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   317
Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b)
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   318
{
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   319
	/* Do colorspace distance matching */
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   320
	unsigned int smallest;
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parents:
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   321
	unsigned int distance;
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   322
	int rd, gd, bd;
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   323
	int i;
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parents:
diff changeset
   324
	Uint8 pixel=0;
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parents:
diff changeset
   325
		
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parents:
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   326
	smallest = ~0;
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parents:
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   327
	for ( i=0; i<pal->ncolors; ++i ) {
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   328
		rd = pal->colors[i].r - r;
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parents:
diff changeset
   329
		gd = pal->colors[i].g - g;
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   330
		bd = pal->colors[i].b - b;
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parents:
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   331
		distance = (rd*rd)+(gd*gd)+(bd*bd);
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parents:
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   332
		if ( distance < smallest ) {
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parents:
diff changeset
   333
			pixel = i;
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parents:
diff changeset
   334
			if ( distance == 0 ) { /* Perfect match! */
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parents:
diff changeset
   335
				break;
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parents:
diff changeset
   336
			}
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parents:
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   337
			smallest = distance;
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parents:
diff changeset
   338
		}
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parents:
diff changeset
   339
	}
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parents:
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   340
	return(pixel);
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parents:
diff changeset
   341
}
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parents:
diff changeset
   342
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   343
/* Find the opaque pixel value corresponding to an RGB triple */
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parents:
diff changeset
   344
Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b)
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parents:
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   345
{
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parents:
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   346
	if ( format->palette == NULL ) {
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parents:
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   347
		return (r >> format->Rloss) << format->Rshift
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parents:
diff changeset
   348
		       | (g >> format->Gloss) << format->Gshift
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
		       | (b >> format->Bloss) << format->Bshift
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parents:
diff changeset
   350
		       | format->Amask;
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parents:
diff changeset
   351
	} else {
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parents:
diff changeset
   352
		return SDL_FindColor(format->palette, r, g, b);
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parents:
diff changeset
   353
	}
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parents:
diff changeset
   354
}
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
/* Find the pixel value corresponding to an RGBA quadruple */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   357
Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
{
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
	if ( format->palette == NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   360
	        return (r >> format->Rloss) << format->Rshift
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
		    | (g >> format->Gloss) << format->Gshift
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
		    | (b >> format->Bloss) << format->Bshift
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
		    | ((a >> format->Aloss) << format->Ashift & format->Amask);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
		return SDL_FindColor(format->palette, r, g, b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   366
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   368
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   369
void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   370
		 Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   372
	if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   373
	        /*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   374
		 * This makes sure that the result is mapped to the
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   375
		 * interval [0..255], and the maximum value for each
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   376
		 * component is 255. This is important to make sure
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
		 * that white is indeed reported as (255, 255, 255),
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   378
		 * and that opaque alpha is 255.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   379
		 * This only works for RGB bit fields at least 4 bit
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   380
		 * wide, which is almost always the case.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
		 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   382
	        unsigned rv, gv, bv, av;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
		rv = (pixel & fmt->Rmask) >> fmt->Rshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
		*r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
		gv = (pixel & fmt->Gmask) >> fmt->Gshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
		*g = (gv << fmt->Gloss) + (gv >> (8 - fmt->Gloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   387
		bv = (pixel & fmt->Bmask) >> fmt->Bshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   388
		*b = (bv << fmt->Bloss) + (bv >> (8 - fmt->Bloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
		if(fmt->Amask) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
		        av = (pixel & fmt->Amask) >> fmt->Ashift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
			*a = (av << fmt->Aloss) + (av >> (8 - fmt->Aloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
		} else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
		        *a = SDL_ALPHA_OPAQUE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
		*r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   396
		*g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
		*b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
		*a = SDL_ALPHA_OPAQUE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   404
	if ( fmt->palette == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
	        /* the note for SDL_GetRGBA above applies here too */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
	        unsigned rv, gv, bv;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
		rv = (pixel & fmt->Rmask) >> fmt->Rshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
		*r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
		gv = (pixel & fmt->Gmask) >> fmt->Gshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
		*g = (gv << fmt->Gloss) + (gv >> (8 - fmt->Gloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
		bv = (pixel & fmt->Bmask) >> fmt->Bshift;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
		*b = (bv << fmt->Bloss) + (bv >> (8 - fmt->Bloss));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
		*r = fmt->palette->colors[pixel].r;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
		*g = fmt->palette->colors[pixel].g;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   416
		*b = fmt->palette->colors[pixel].b;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   418
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   419
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   420
/* Apply gamma to a set of colors - this is easy. :) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
							int ncolors)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
	int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
	for ( i=0; i<ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
		output[i].r = gamma[0*256 + colors[i].r] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
		output[i].g = gamma[1*256 + colors[i].g] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
		output[i].b = gamma[2*256 + colors[i].b] >> 8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   430
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
/* Map from Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
	Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
	int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
	if ( identical ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
		if ( src->ncolors <= dst->ncolors ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
			/* If an identical palette, no need to map */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   442
			if ( memcmp(src->colors, dst->colors, src->ncolors*
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
						sizeof(SDL_Color)) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
				*identical = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
				return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
		*identical = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   449
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   450
	map = (Uint8 *)malloc(src->ncolors);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   451
	if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   452
		SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   453
		return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   454
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   455
	for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   456
		map[i] = SDL_FindColor(dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   457
			src->colors[i].r, src->colors[i].g, src->colors[i].b);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   458
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   459
	return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   460
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   461
/* Map from Palette to BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   462
static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   463
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   464
	Uint8 *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   465
	int i;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   466
	int  bpp;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   467
	unsigned alpha;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   468
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   469
	bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   470
	map = (Uint8 *)malloc(src->ncolors*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   471
	if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   472
		SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   473
		return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   474
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   475
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   476
	alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   477
	/* We memory copy to the pixel map so the endianness is preserved */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   478
	for ( i=0; i<src->ncolors; ++i ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   479
		ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   480
			      src->colors[i].r, src->colors[i].g,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   481
			      src->colors[i].b, alpha);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   482
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   483
	return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   484
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   485
/* Map from BitField to Dithered-Palette to Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   486
static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   487
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   488
	/* Generate a 256 color dither palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   489
	SDL_Palette dithered;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   490
	SDL_Color colors[256];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   491
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   492
	dithered.ncolors = 256;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   493
	SDL_DitherColors(colors, 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   494
	dithered.colors = colors;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   495
	return(Map1to1(&dithered, dst, identical));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   496
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   497
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   498
SDL_BlitMap *SDL_AllocBlitMap(void)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   499
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   500
	SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   501
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   502
	/* Allocate the empty map */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   503
	map = (SDL_BlitMap *)malloc(sizeof(*map));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   504
	if ( map == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   505
		SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   506
		return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   507
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   508
	memset(map, 0, sizeof(*map));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   509
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   510
	/* Allocate the software blit data */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   511
	map->sw_data = (struct private_swaccel *)malloc(sizeof(*map->sw_data));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   512
	if ( map->sw_data == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   513
		SDL_FreeBlitMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   514
		SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   515
		return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   516
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   517
	memset(map->sw_data, 0, sizeof(*map->sw_data));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   518
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   519
	/* It's ready to go */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   520
	return(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   521
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   522
void SDL_InvalidateMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   523
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   524
	if ( ! map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   525
		return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   526
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   527
	map->dst = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   528
	map->format_version = (unsigned int)-1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   529
	if ( map->table ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   530
		free(map->table);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   531
		map->table = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   532
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   533
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   534
int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   535
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   536
	SDL_PixelFormat *srcfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   537
	SDL_PixelFormat *dstfmt;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   538
	SDL_BlitMap *map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   539
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   540
	/* Clear out any previous mapping */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   541
	map = src->map;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   542
	if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   543
		SDL_UnRLESurface(src, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   544
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   545
	SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   546
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   547
	/* Figure out what kind of mapping we're doing */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   548
	map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   549
	srcfmt = src->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   550
	dstfmt = dst->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   551
	switch (srcfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   552
	    case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   553
		switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   554
		    case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   555
			/* Palette --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   556
			/* If both SDL_HWSURFACE, assume have same palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   557
			if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   558
			     ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   559
				map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   560
			} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   561
				map->table = Map1to1(srcfmt->palette,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   562
					dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   563
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   564
			if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   565
				if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   566
					return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   567
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   568
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   569
			if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   570
				map->identity = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   571
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   572
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   573
		    default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   574
			/* Palette --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   575
			map->table = Map1toN(srcfmt->palette, dstfmt);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   576
			if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   577
				return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   578
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   579
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   580
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   581
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   582
	default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   583
		switch (dstfmt->BytesPerPixel) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   584
		    case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   585
			/* BitField --> Palette */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   586
			map->table = MapNto1(srcfmt,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   587
					dstfmt->palette, &map->identity);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   588
			if ( ! map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   589
				if ( map->table == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   590
					return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   591
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   592
			}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   593
			map->identity = 0;	/* Don't optimize to copy */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   594
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   595
		    default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   596
			/* BitField --> BitField */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   597
			if ( FORMAT_EQUAL(srcfmt, dstfmt) )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   598
				map->identity = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   599
			break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   600
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   601
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   602
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   603
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   604
	map->dst = dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   605
	map->format_version = dst->format_version;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   606
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   607
	/* Choose your blitters wisely */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   608
	return(SDL_CalculateBlit(src));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   609
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   610
void SDL_FreeBlitMap(SDL_BlitMap *map)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   611
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   612
	if ( map ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   613
		SDL_InvalidateMap(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   614
		if ( map->sw_data != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   615
			free(map->sw_data);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   616
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   617
		free(map);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   618
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   619
}