src/video/SDL_blit_0.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
changeset 0 74212992fb08
child 91 e85e03f195b4
permissions -rw-r--r--
Initial revision
slouken@0
     1
/*
slouken@0
     2
    SDL - Simple DirectMedia Layer
slouken@0
     3
    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
slouken@0
     4
slouken@0
     5
    This library is free software; you can redistribute it and/or
slouken@0
     6
    modify it under the terms of the GNU Library General Public
slouken@0
     7
    License as published by the Free Software Foundation; either
slouken@0
     8
    version 2 of the License, or (at your option) any later version.
slouken@0
     9
slouken@0
    10
    This library is distributed in the hope that it will be useful,
slouken@0
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@0
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@0
    13
    Library General Public License for more details.
slouken@0
    14
slouken@0
    15
    You should have received a copy of the GNU Library General Public
slouken@0
    16
    License along with this library; if not, write to the Free
slouken@0
    17
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
slouken@0
    18
slouken@0
    19
    Sam Lantinga
slouken@0
    20
    slouken@devolution.com
slouken@0
    21
*/
slouken@0
    22
slouken@0
    23
#ifdef SAVE_RCSID
slouken@0
    24
static char rcsid =
slouken@0
    25
 "@(#) $Id$";
slouken@0
    26
#endif
slouken@0
    27
slouken@0
    28
#include <stdio.h>
slouken@0
    29
#include <string.h>
slouken@0
    30
slouken@0
    31
#include "SDL_types.h"
slouken@0
    32
#include "SDL_video.h"
slouken@0
    33
#include "SDL_blit.h"
slouken@0
    34
slouken@0
    35
/* Functions to blit from bitmaps to other surfaces */
slouken@0
    36
slouken@0
    37
static void BlitBto1(SDL_BlitInfo *info)
slouken@0
    38
{
slouken@0
    39
	int c;
slouken@0
    40
	int width, height;
slouken@0
    41
	Uint8 *src, *map, *dst;
slouken@0
    42
	int srcskip, dstskip;
slouken@0
    43
slouken@0
    44
	/* Set up some basic variables */
slouken@0
    45
	width = info->d_width;
slouken@0
    46
	height = info->d_height;
slouken@0
    47
	src = info->s_pixels;
slouken@0
    48
	srcskip = info->s_skip;
slouken@0
    49
	dst = info->d_pixels;
slouken@0
    50
	dstskip = info->d_skip;
slouken@0
    51
	map = info->table;
slouken@0
    52
	srcskip += width-(width+7)/8;
slouken@0
    53
slouken@0
    54
	if ( map ) {
slouken@0
    55
		while ( height-- ) {
slouken@0
    56
		        Uint8 byte = 0, bit;
slouken@0
    57
	    		for ( c=0; c<width; ++c ) {
slouken@0
    58
				if ( (c%8) == 0 ) {
slouken@0
    59
					byte = *src++;
slouken@0
    60
				}
slouken@0
    61
				bit = (byte&0x80)>>7;
slouken@0
    62
				if ( 1 ) {
slouken@0
    63
				  *dst = map[bit];
slouken@0
    64
				}
slouken@0
    65
				dst++;
slouken@0
    66
				byte <<= 1;
slouken@0
    67
			}
slouken@0
    68
			src += srcskip;
slouken@0
    69
			dst += dstskip;
slouken@0
    70
		}
slouken@0
    71
	} else {
slouken@0
    72
		while ( height-- ) {
slouken@0
    73
		        Uint8 byte = 0, bit;
slouken@0
    74
	    		for ( c=0; c<width; ++c ) {
slouken@0
    75
				if ( (c%8) == 0 ) {
slouken@0
    76
					byte = *src++;
slouken@0
    77
				}
slouken@0
    78
				bit = (byte&0x80)>>7;
slouken@0
    79
				if ( 1 ) {
slouken@0
    80
				  *dst = bit;
slouken@0
    81
				}
slouken@0
    82
				dst++;
slouken@0
    83
				byte <<= 1;
slouken@0
    84
			}
slouken@0
    85
			src += srcskip;
slouken@0
    86
			dst += dstskip;
slouken@0
    87
		}
slouken@0
    88
	}
slouken@0
    89
}
slouken@0
    90
static void BlitBto2(SDL_BlitInfo *info)
slouken@0
    91
{
slouken@0
    92
	int c;
slouken@0
    93
	int width, height;
slouken@0
    94
	Uint8 *src;
slouken@0
    95
	Uint16 *map, *dst;
slouken@0
    96
	int srcskip, dstskip;
slouken@0
    97
slouken@0
    98
	/* Set up some basic variables */
slouken@0
    99
	width = info->d_width;
slouken@0
   100
	height = info->d_height;
slouken@0
   101
	src = info->s_pixels;
slouken@0
   102
	srcskip = info->s_skip;
slouken@0
   103
	dst = (Uint16 *)info->d_pixels;
slouken@0
   104
	dstskip = info->d_skip/2;
slouken@0
   105
	map = (Uint16 *)info->table;
slouken@0
   106
	srcskip += width-(width+7)/8;
slouken@0
   107
slouken@0
   108
	while ( height-- ) {
slouken@0
   109
	        Uint8 byte = 0, bit;
slouken@0
   110
	    	for ( c=0; c<width; ++c ) {
slouken@0
   111
			if ( (c%8) == 0 ) {
slouken@0
   112
				byte = *src++;
slouken@0
   113
			}
slouken@0
   114
			bit = (byte&0x80)>>7;
slouken@0
   115
			if ( 1 ) {
slouken@0
   116
				*dst = map[bit];
slouken@0
   117
			}
slouken@0
   118
			byte <<= 1;
slouken@0
   119
			dst++;
slouken@0
   120
		}
slouken@0
   121
		src += srcskip;
slouken@0
   122
		dst += dstskip;
slouken@0
   123
	}
slouken@0
   124
}
slouken@0
   125
static void BlitBto3(SDL_BlitInfo *info)
slouken@0
   126
{
slouken@0
   127
	int c, o;
slouken@0
   128
	int width, height;
slouken@0
   129
	Uint8 *src, *map, *dst;
slouken@0
   130
	int srcskip, dstskip;
slouken@0
   131
slouken@0
   132
	/* Set up some basic variables */
slouken@0
   133
	width = info->d_width;
slouken@0
   134
	height = info->d_height;
slouken@0
   135
	src = info->s_pixels;
slouken@0
   136
	srcskip = info->s_skip;
slouken@0
   137
	dst = info->d_pixels;
slouken@0
   138
	dstskip = info->d_skip;
slouken@0
   139
	map = info->table;
slouken@0
   140
	srcskip += width-(width+7)/8;
slouken@0
   141
slouken@0
   142
	while ( height-- ) {
slouken@0
   143
	        Uint8 byte = 0, bit;
slouken@0
   144
	    	for ( c=0; c<width; ++c ) {
slouken@0
   145
			if ( (c%8) == 0 ) {
slouken@0
   146
				byte = *src++;
slouken@0
   147
			}
slouken@0
   148
			bit = (byte&0x80)>>7;
slouken@0
   149
			if ( 1 ) {
slouken@0
   150
				o = bit * 4;
slouken@0
   151
				dst[0] = map[o++];
slouken@0
   152
				dst[1] = map[o++];
slouken@0
   153
				dst[2] = map[o++];
slouken@0
   154
			}
slouken@0
   155
			byte <<= 1;
slouken@0
   156
			dst += 3;
slouken@0
   157
		}
slouken@0
   158
		src += srcskip;
slouken@0
   159
		dst += dstskip;
slouken@0
   160
	}
slouken@0
   161
}
slouken@0
   162
static void BlitBto4(SDL_BlitInfo *info)
slouken@0
   163
{
slouken@0
   164
	int width, height;
slouken@0
   165
	Uint8 *src;
slouken@0
   166
	Uint32 *map, *dst;
slouken@0
   167
	int srcskip, dstskip;
slouken@0
   168
	int c;
slouken@0
   169
slouken@0
   170
	/* Set up some basic variables */
slouken@0
   171
	width = info->d_width;
slouken@0
   172
	height = info->d_height;
slouken@0
   173
	src = info->s_pixels;
slouken@0
   174
	srcskip = info->s_skip;
slouken@0
   175
	dst = (Uint32 *)info->d_pixels;
slouken@0
   176
	dstskip = info->d_skip/4;
slouken@0
   177
	map = (Uint32 *)info->table;
slouken@0
   178
	srcskip += width-(width+7)/8;
slouken@0
   179
slouken@0
   180
	while ( height-- ) {
slouken@0
   181
	        Uint8 byte = 0, bit;
slouken@0
   182
	    	for ( c=0; c<width; ++c ) {
slouken@0
   183
			if ( (c%8) == 0 ) {
slouken@0
   184
				byte = *src++;
slouken@0
   185
			}
slouken@0
   186
			bit = (byte&0x80)>>7;
slouken@0
   187
			if ( 1 ) {
slouken@0
   188
				*dst = map[bit];
slouken@0
   189
			}
slouken@0
   190
			byte <<= 1;
slouken@0
   191
			dst++;
slouken@0
   192
		}
slouken@0
   193
		src += srcskip;
slouken@0
   194
		dst += dstskip;
slouken@0
   195
	}
slouken@0
   196
}
slouken@0
   197
slouken@0
   198
static void BlitBto1Key(SDL_BlitInfo *info)
slouken@0
   199
{
slouken@0
   200
        int width = info->d_width;
slouken@0
   201
	int height = info->d_height;
slouken@0
   202
	Uint8 *src = info->s_pixels;
slouken@0
   203
	Uint8 *dst = info->d_pixels;
slouken@0
   204
	int srcskip = info->s_skip;
slouken@0
   205
	int dstskip = info->d_skip;
slouken@0
   206
	Uint32 ckey = info->src->colorkey;
slouken@0
   207
	Uint8 *palmap = info->table;
slouken@0
   208
	int c;
slouken@0
   209
slouken@0
   210
	/* Set up some basic variables */
slouken@0
   211
	srcskip += width-(width+7)/8;
slouken@0
   212
slouken@0
   213
	if ( palmap ) {
slouken@0
   214
		while ( height-- ) {
slouken@0
   215
		        Uint8  byte = 0, bit;
slouken@0
   216
	    		for ( c=0; c<width; ++c ) {
slouken@0
   217
				if ( (c%8) == 0 ) {
slouken@0
   218
					byte = *src++;
slouken@0
   219
				}
slouken@0
   220
				bit = (byte&0x80)>>7;
slouken@0
   221
				if ( bit != ckey ) {
slouken@0
   222
				  *dst = palmap[bit];
slouken@0
   223
				}
slouken@0
   224
				dst++;
slouken@0
   225
				byte <<= 1;
slouken@0
   226
			}
slouken@0
   227
			src += srcskip;
slouken@0
   228
			dst += dstskip;
slouken@0
   229
		}
slouken@0
   230
	} else {
slouken@0
   231
		while ( height-- ) {
slouken@0
   232
		        Uint8  byte = 0, bit;
slouken@0
   233
	    		for ( c=0; c<width; ++c ) {
slouken@0
   234
				if ( (c%8) == 0 ) {
slouken@0
   235
					byte = *src++;
slouken@0
   236
				}
slouken@0
   237
				bit = (byte&0x80)>>7;
slouken@0
   238
				if ( bit != ckey ) {
slouken@0
   239
				  *dst = bit;
slouken@0
   240
				}
slouken@0
   241
				dst++;
slouken@0
   242
				byte <<= 1;
slouken@0
   243
			}
slouken@0
   244
			src += srcskip;
slouken@0
   245
			dst += dstskip;
slouken@0
   246
		}
slouken@0
   247
	}
slouken@0
   248
}
slouken@0
   249
slouken@0
   250
static void BlitBto2Key(SDL_BlitInfo *info)
slouken@0
   251
{
slouken@0
   252
        int width = info->d_width;
slouken@0
   253
	int height = info->d_height;
slouken@0
   254
	Uint8 *src = info->s_pixels;
slouken@0
   255
	Uint16 *dstp = (Uint16 *)info->d_pixels;
slouken@0
   256
	int srcskip = info->s_skip;
slouken@0
   257
	int dstskip = info->d_skip;
slouken@0
   258
	Uint32 ckey = info->src->colorkey;
slouken@0
   259
	Uint8 *palmap = info->table;
slouken@0
   260
	int c;
slouken@0
   261
slouken@0
   262
	/* Set up some basic variables */
slouken@0
   263
	srcskip += width-(width+7)/8;
slouken@0
   264
	dstskip /= 2;
slouken@0
   265
slouken@0
   266
	while ( height-- ) {
slouken@0
   267
	        Uint8 byte = 0, bit;
slouken@0
   268
	    	for ( c=0; c<width; ++c ) {
slouken@0
   269
			if ( (c%8) == 0 ) {
slouken@0
   270
				byte = *src++;
slouken@0
   271
			}
slouken@0
   272
			bit = (byte&0x80)>>7;
slouken@0
   273
			if ( bit != ckey ) {
slouken@0
   274
				*dstp=((Uint16 *)palmap)[bit];
slouken@0
   275
			}
slouken@0
   276
			byte <<= 1;
slouken@0
   277
			dstp++;
slouken@0
   278
		}
slouken@0
   279
		src += srcskip;
slouken@0
   280
		dstp += dstskip;
slouken@0
   281
	}
slouken@0
   282
}
slouken@0
   283
slouken@0
   284
static void BlitBto3Key(SDL_BlitInfo *info)
slouken@0
   285
{
slouken@0
   286
        int width = info->d_width;
slouken@0
   287
	int height = info->d_height;
slouken@0
   288
	Uint8 *src = info->s_pixels;
slouken@0
   289
	Uint8 *dst = info->d_pixels;
slouken@0
   290
	int srcskip = info->s_skip;
slouken@0
   291
	int dstskip = info->d_skip;
slouken@0
   292
	Uint32 ckey = info->src->colorkey;
slouken@0
   293
	Uint8 *palmap = info->table;
slouken@0
   294
	int c;
slouken@0
   295
slouken@0
   296
	/* Set up some basic variables */
slouken@0
   297
	srcskip += width-(width+7)/8;
slouken@0
   298
slouken@0
   299
	while ( height-- ) {
slouken@0
   300
	        Uint8  byte = 0, bit;
slouken@0
   301
	    	for ( c=0; c<width; ++c ) {
slouken@0
   302
			if ( (c%8) == 0 ) {
slouken@0
   303
				byte = *src++;
slouken@0
   304
			}
slouken@0
   305
			bit = (byte&0x80)>>7;
slouken@0
   306
			if ( bit != ckey ) {
slouken@0
   307
				memcpy(dst, &palmap[bit*4], 3);
slouken@0
   308
			}
slouken@0
   309
			byte <<= 1;
slouken@0
   310
			dst += 3;
slouken@0
   311
		}
slouken@0
   312
		src += srcskip;
slouken@0
   313
		dst += dstskip;
slouken@0
   314
	}
slouken@0
   315
}
slouken@0
   316
slouken@0
   317
static void BlitBto4Key(SDL_BlitInfo *info)
slouken@0
   318
{
slouken@0
   319
        int width = info->d_width;
slouken@0
   320
	int height = info->d_height;
slouken@0
   321
	Uint8 *src = info->s_pixels;
slouken@0
   322
	Uint32 *dstp = (Uint32 *)info->d_pixels;
slouken@0
   323
	int srcskip = info->s_skip;
slouken@0
   324
	int dstskip = info->d_skip;
slouken@0
   325
	Uint32 ckey = info->src->colorkey;
slouken@0
   326
	Uint8 *palmap = info->table;
slouken@0
   327
	int c;
slouken@0
   328
slouken@0
   329
	/* Set up some basic variables */
slouken@0
   330
	srcskip += width-(width+7)/8;
slouken@0
   331
	dstskip /= 4;
slouken@0
   332
slouken@0
   333
	while ( height-- ) {
slouken@0
   334
	        Uint8 byte = 0, bit;
slouken@0
   335
	    	for ( c=0; c<width; ++c ) {
slouken@0
   336
			if ( (c%8) == 0 ) {
slouken@0
   337
				byte = *src++;
slouken@0
   338
			}
slouken@0
   339
			bit = (byte&0x80)>>7;
slouken@0
   340
			if ( bit != ckey ) {
slouken@0
   341
				*dstp=((Uint32 *)palmap)[bit];
slouken@0
   342
			}
slouken@0
   343
			byte <<= 1;
slouken@0
   344
			dstp++;
slouken@0
   345
		}
slouken@0
   346
		src += srcskip;
slouken@0
   347
		dstp += dstskip;
slouken@0
   348
	}
slouken@0
   349
}
slouken@0
   350
slouken@0
   351
static void BlitBtoNAlpha(SDL_BlitInfo *info)
slouken@0
   352
{
slouken@0
   353
        int width = info->d_width;
slouken@0
   354
	int height = info->d_height;
slouken@0
   355
	Uint8 *src = info->s_pixels;
slouken@0
   356
	Uint8 *dst = info->d_pixels;
slouken@0
   357
	int srcskip = info->s_skip;
slouken@0
   358
	int dstskip = info->d_skip;
slouken@0
   359
	const SDL_Color *srcpal	= info->src->palette->colors;
slouken@0
   360
	SDL_PixelFormat *dstfmt = info->dst;
slouken@0
   361
	int  dstbpp;
slouken@0
   362
	int c;
slouken@0
   363
	const int A = info->src->alpha;
slouken@0
   364
slouken@0
   365
	/* Set up some basic variables */
slouken@0
   366
	dstbpp = dstfmt->BytesPerPixel;
slouken@0
   367
	srcskip += width-(width+7)/8;
slouken@0
   368
slouken@0
   369
	while ( height-- ) {
slouken@0
   370
	        Uint8 byte = 0, bit;
slouken@0
   371
	    	for ( c=0; c<width; ++c ) {
slouken@0
   372
			if ( (c%8) == 0 ) {
slouken@0
   373
				byte = *src++;
slouken@0
   374
			}
slouken@0
   375
			bit = (byte&0x80)>>7;
slouken@0
   376
			if ( 1 ) {
slouken@0
   377
			        Uint32 pixel;
slouken@0
   378
			        unsigned sR, sG, sB;
slouken@0
   379
				unsigned dR, dG, dB;
slouken@0
   380
				sR = srcpal[bit].r;
slouken@0
   381
				sG = srcpal[bit].g;
slouken@0
   382
				sB = srcpal[bit].b;
slouken@0
   383
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
slouken@0
   384
							pixel, dR, dG, dB);
slouken@0
   385
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
slouken@0
   386
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
slouken@0
   387
			}
slouken@0
   388
			byte <<= 1;
slouken@0
   389
			dst += dstbpp;
slouken@0
   390
		}
slouken@0
   391
		src += srcskip;
slouken@0
   392
		dst += dstskip;
slouken@0
   393
	}
slouken@0
   394
}
slouken@0
   395
slouken@0
   396
static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
slouken@0
   397
{
slouken@0
   398
        int width = info->d_width;
slouken@0
   399
	int height = info->d_height;
slouken@0
   400
	Uint8 *src = info->s_pixels;
slouken@0
   401
	Uint8 *dst = info->d_pixels;
slouken@0
   402
	int srcskip = info->s_skip;
slouken@0
   403
	int dstskip = info->d_skip;
slouken@0
   404
	SDL_PixelFormat *srcfmt = info->src;
slouken@0
   405
	SDL_PixelFormat *dstfmt = info->dst;
slouken@0
   406
	const SDL_Color *srcpal	= srcfmt->palette->colors;
slouken@0
   407
	int dstbpp;
slouken@0
   408
	int c;
slouken@0
   409
	const int A = srcfmt->alpha;
slouken@0
   410
	Uint32 ckey = srcfmt->colorkey;
slouken@0
   411
slouken@0
   412
	/* Set up some basic variables */
slouken@0
   413
	dstbpp = dstfmt->BytesPerPixel;
slouken@0
   414
	srcskip += width-(width+7)/8;
slouken@0
   415
slouken@0
   416
	while ( height-- ) {
slouken@0
   417
	        Uint8  byte = 0, bit;
slouken@0
   418
	    	for ( c=0; c<width; ++c ) {
slouken@0
   419
			if ( (c%8) == 0 ) {
slouken@0
   420
				byte = *src++;
slouken@0
   421
			}
slouken@0
   422
			bit = (byte&0x80)>>7;
slouken@0
   423
			if ( bit != ckey ) {
slouken@0
   424
			        int sR, sG, sB;
slouken@0
   425
				int dR, dG, dB;
slouken@0
   426
				Uint32 pixel;
slouken@0
   427
				sR = srcpal[bit].r;
slouken@0
   428
				sG = srcpal[bit].g;
slouken@0
   429
				sB = srcpal[bit].b;
slouken@0
   430
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
slouken@0
   431
							pixel, dR, dG, dB);
slouken@0
   432
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
slouken@0
   433
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
slouken@0
   434
			}
slouken@0
   435
			byte <<= 1;
slouken@0
   436
			dst += dstbpp;
slouken@0
   437
		}
slouken@0
   438
		src += srcskip;
slouken@0
   439
		dst += dstskip;
slouken@0
   440
	}
slouken@0
   441
}
slouken@0
   442
slouken@0
   443
static SDL_loblit bitmap_blit[] = {
slouken@0
   444
	NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
slouken@0
   445
};
slouken@0
   446
slouken@0
   447
static SDL_loblit colorkey_blit[] = {
slouken@0
   448
    NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
slouken@0
   449
};
slouken@0
   450
slouken@0
   451
SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
slouken@0
   452
{
slouken@0
   453
	int which;
slouken@0
   454
slouken@0
   455
	if ( surface->map->dst->format->BitsPerPixel < 8 ) {
slouken@0
   456
		which = 0;
slouken@0
   457
	} else {
slouken@0
   458
		which = surface->map->dst->format->BytesPerPixel;
slouken@0
   459
	}
slouken@0
   460
	switch(blit_index) {
slouken@0
   461
	case 0:			/* copy */
slouken@0
   462
	    return bitmap_blit[which];
slouken@0
   463
slouken@0
   464
	case 1:			/* colorkey */
slouken@0
   465
	    return colorkey_blit[which];
slouken@0
   466
slouken@0
   467
	case 2:			/* alpha */
slouken@0
   468
	    return which >= 2 ? BlitBtoNAlpha : NULL;
slouken@0
   469
slouken@0
   470
	case 4:			/* alpha + colorkey */
slouken@0
   471
	    return which >= 2 ? BlitBtoNAlphaKey : NULL;
slouken@0
   472
	}
slouken@0
   473
	return NULL;
slouken@0
   474
}
slouken@0
   475