src/video/SDL_blit.h
author Sam Lantinga <slouken@libsdl.org>
Thu, 03 Feb 2011 02:45:29 -0800
changeset 5163 d72793305335
parent 5140 e743b9c3f6d6
child 5184 d976b67150c5
permissions -rw-r--r--
Making the API simpler, moved the surface drawing functions to the software renderer.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2010 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 #ifndef _SDL_blit_h
    25 #define _SDL_blit_h
    26 
    27 #ifdef __MINGW32__
    28 #include <_mingw.h>
    29 #endif
    30 
    31 #if defined(__MINGW32__) && defined(__MINGW64_VERSION_MAJOR)
    32 #include <intrin.h>
    33 #else
    34 #ifdef __MMX__
    35 #include <mmintrin.h>
    36 #endif
    37 #ifdef __3dNOW__
    38 #include <mm3dnow.h>
    39 #endif
    40 #ifdef __SSE__
    41 #include <xmmintrin.h>
    42 #endif
    43 #ifdef __SSE2__
    44 #include <emmintrin.h>
    45 #endif
    46 #endif
    47 
    48 #include "SDL_cpuinfo.h"
    49 #include "SDL_endian.h"
    50 #include "SDL_surface.h"
    51 
    52 /* SDL blit copy flags */
    53 #define SDL_COPY_MODULATE_COLOR     0x00000001
    54 #define SDL_COPY_MODULATE_ALPHA     0x00000002
    55 #define SDL_COPY_BLEND              0x00000010
    56 #define SDL_COPY_ADD                0x00000020
    57 #define SDL_COPY_COLORKEY           0x00000100
    58 #define SDL_COPY_NEAREST            0x00000200
    59 #define SDL_COPY_RLE_DESIRED        0x00001000
    60 #define SDL_COPY_RLE_COLORKEY       0x00002000
    61 #define SDL_COPY_RLE_ALPHAKEY       0x00004000
    62 #define SDL_COPY_RLE_MASK           (SDL_COPY_RLE_DESIRED|SDL_COPY_RLE_COLORKEY|SDL_COPY_RLE_ALPHAKEY)
    63 
    64 /* SDL blit CPU flags */
    65 #define SDL_CPU_ANY                 0x00000000
    66 #define SDL_CPU_MMX                 0x00000001
    67 #define SDL_CPU_3DNOW               0x00000002
    68 #define SDL_CPU_SSE                 0x00000004
    69 #define SDL_CPU_SSE2                0x00000008
    70 #define SDL_CPU_ALTIVEC_PREFETCH    0x00000010
    71 #define SDL_CPU_ALTIVEC_NOPREFETCH  0x00000020
    72 
    73 typedef struct
    74 {
    75     Uint8 *src;
    76     int src_w, src_h;
    77     int src_pitch;
    78     int src_skip;
    79     Uint8 *dst;
    80     int dst_w, dst_h;
    81     int dst_pitch;
    82     int dst_skip;
    83     SDL_PixelFormat *src_fmt;
    84     SDL_PixelFormat *dst_fmt;
    85     Uint8 *table;
    86     int flags;
    87     Uint32 colorkey;
    88     Uint8 r, g, b, a;
    89 } SDL_BlitInfo;
    90 
    91 typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info);
    92 
    93 typedef struct
    94 {
    95     Uint32 src_format;
    96     Uint32 dst_format;
    97     int flags;
    98     int cpu;
    99     SDL_BlitFunc func;
   100 } SDL_BlitFuncEntry;
   101 
   102 /* Blit mapping definition */
   103 typedef struct SDL_BlitMap
   104 {
   105     SDL_Surface *dst;
   106     int identity;
   107     SDL_blit blit;
   108     void *data;
   109     SDL_BlitInfo info;
   110 
   111     /* the version count matches the destination; mismatch indicates
   112        an invalid mapping */
   113     unsigned int format_version;
   114 } SDL_BlitMap;
   115 
   116 /* Functions found in SDL_blit.c */
   117 extern int SDL_CalculateBlit(SDL_Surface * surface);
   118 
   119 /* Functions found in SDL_blit_*.c */
   120 extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface);
   121 extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface);
   122 extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface);
   123 extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface);
   124 
   125 /*
   126  * Useful macros for blitting routines
   127  */
   128 
   129 #if defined(__GNUC__)
   130 #define DECLARE_ALIGNED(t,v,a)  t __attribute__((aligned(a))) v
   131 #elif defined(_MSC_VER)
   132 #define DECLARE_ALIGNED(t,v,a)  __declspec(align(a)) t v
   133 #else
   134 #define DECLARE_ALIGNED(t,v,a)  t v
   135 #endif
   136 
   137 #define FORMAT_EQUAL(A, B)						\
   138     ((A)->BitsPerPixel == (B)->BitsPerPixel				\
   139      && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
   140 
   141 /* Load pixel of the specified format from a buffer and get its R-G-B values */
   142 /* FIXME: rescale values to 0..255 here? */
   143 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b)				\
   144 {									\
   145 	r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); 		\
   146 	g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); 		\
   147 	b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); 		\
   148 }
   149 #define RGB_FROM_RGB565(Pixel, r, g, b)					\
   150 {									\
   151 	r = (((Pixel&0xF800)>>11)<<3);		 			\
   152 	g = (((Pixel&0x07E0)>>5)<<2); 					\
   153 	b = ((Pixel&0x001F)<<3); 					\
   154 }
   155 #define RGB_FROM_RGB555(Pixel, r, g, b)					\
   156 {									\
   157 	r = (((Pixel&0x7C00)>>10)<<3);		 			\
   158 	g = (((Pixel&0x03E0)>>5)<<3); 					\
   159 	b = ((Pixel&0x001F)<<3); 					\
   160 }
   161 #define RGB_FROM_RGB888(Pixel, r, g, b)					\
   162 {									\
   163 	r = ((Pixel&0xFF0000)>>16);		 			\
   164 	g = ((Pixel&0xFF00)>>8);		 			\
   165 	b = (Pixel&0xFF);			 			\
   166 }
   167 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel)				   \
   168 do {									   \
   169 	switch (bpp) {							   \
   170 		case 2:							   \
   171 			Pixel = *((Uint16 *)(buf));			   \
   172 		break;							   \
   173 									   \
   174 		case 3: {						   \
   175 		        Uint8 *B = (Uint8 *)(buf);			   \
   176 			if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
   177 			        Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
   178 			} else {					   \
   179 			        Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
   180 			}						   \
   181 		}							   \
   182 		break;							   \
   183 									   \
   184 		case 4:							   \
   185 			Pixel = *((Uint32 *)(buf));			   \
   186 		break;							   \
   187 									   \
   188 		default:						   \
   189 		        Pixel; /* stop gcc complaints */		   \
   190 		break;							   \
   191 	}								   \
   192 } while (0)
   193 
   194 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b)			   \
   195 do {									   \
   196 	switch (bpp) {							   \
   197 		case 2:							   \
   198 			Pixel = *((Uint16 *)(buf));			   \
   199 			RGB_FROM_PIXEL(Pixel, fmt, r, g, b);		   \
   200 		break;							   \
   201 									   \
   202 		case 3:	{						   \
   203                         if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
   204 			        r = *((buf)+fmt->Rshift/8);		   \
   205 				g = *((buf)+fmt->Gshift/8);		   \
   206 				b = *((buf)+fmt->Bshift/8);		   \
   207 			} else {					   \
   208 			        r = *((buf)+2-fmt->Rshift/8);		   \
   209 				g = *((buf)+2-fmt->Gshift/8);		   \
   210 				b = *((buf)+2-fmt->Bshift/8);		   \
   211 			}						   \
   212 		}							   \
   213 		break;							   \
   214 									   \
   215 		case 4:							   \
   216 			Pixel = *((Uint32 *)(buf));			   \
   217 			RGB_FROM_PIXEL(Pixel, fmt, r, g, b);		   \
   218 		break;							   \
   219 									   \
   220 		default:						   \
   221 		        Pixel; /* stop gcc complaints */		   \
   222 		break;							   \
   223 	}								   \
   224 } while (0)
   225 
   226 /* Assemble R-G-B values into a specified pixel format and store them */
   227 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b)				\
   228 {									\
   229 	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
   230 		((g>>fmt->Gloss)<<fmt->Gshift)|				\
   231 		((b>>fmt->Bloss)<<fmt->Bshift);				\
   232 }
   233 #define RGB565_FROM_RGB(Pixel, r, g, b)					\
   234 {									\
   235 	Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3);			\
   236 }
   237 #define RGB555_FROM_RGB(Pixel, r, g, b)					\
   238 {									\
   239 	Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3);			\
   240 }
   241 #define RGB888_FROM_RGB(Pixel, r, g, b)					\
   242 {									\
   243 	Pixel = (r<<16)|(g<<8)|b;					\
   244 }
   245 #define ARGB8888_FROM_RGBA(Pixel, r, g, b, a)				\
   246 {									\
   247 	Pixel = (a<<24)|(r<<16)|(g<<8)|b;				\
   248 }
   249 #define RGBA8888_FROM_RGBA(Pixel, r, g, b, a)				\
   250 {									\
   251 	Pixel = (r<<24)|(g<<16)|(b<<8)|a;				\
   252 }
   253 #define ABGR8888_FROM_RGBA(Pixel, r, g, b, a)				\
   254 {									\
   255 	Pixel = (a<<24)|(b<<16)|(g<<8)|r;				\
   256 }
   257 #define BGRA8888_FROM_RGBA(Pixel, r, g, b, a)				\
   258 {									\
   259 	Pixel = (b<<24)|(g<<16)|(r<<8)|a;				\
   260 }
   261 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) 				\
   262 {									\
   263 	switch (bpp) {							\
   264 		case 2: {						\
   265 			Uint16 Pixel;					\
   266 									\
   267 			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
   268 			*((Uint16 *)(buf)) = Pixel;			\
   269 		}							\
   270 		break;							\
   271 									\
   272 		case 3: {						\
   273                         if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
   274 			        *((buf)+fmt->Rshift/8) = r;		\
   275 				*((buf)+fmt->Gshift/8) = g;		\
   276 				*((buf)+fmt->Bshift/8) = b;		\
   277 			} else {					\
   278 			        *((buf)+2-fmt->Rshift/8) = r;		\
   279 				*((buf)+2-fmt->Gshift/8) = g;		\
   280 				*((buf)+2-fmt->Bshift/8) = b;		\
   281 			}						\
   282 		}							\
   283 		break;							\
   284 									\
   285 		case 4: {						\
   286 			Uint32 Pixel;					\
   287 									\
   288 			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
   289 			*((Uint32 *)(buf)) = Pixel;			\
   290 		}							\
   291 		break;							\
   292 	}								\
   293 }
   294 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
   295 {									\
   296 	switch (bpp) {							\
   297 		case 2: {						\
   298 			Uint16 *bufp;					\
   299 			Uint16 Pixel;					\
   300 									\
   301 			bufp = (Uint16 *)buf;				\
   302 			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
   303 			*bufp = Pixel | (*bufp & Amask);		\
   304 		}							\
   305 		break;							\
   306 									\
   307 		case 3: {						\
   308                         if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
   309 			        *((buf)+fmt->Rshift/8) = r;		\
   310 				*((buf)+fmt->Gshift/8) = g;		\
   311 				*((buf)+fmt->Bshift/8) = b;		\
   312 			} else {					\
   313 			        *((buf)+2-fmt->Rshift/8) = r;		\
   314 				*((buf)+2-fmt->Gshift/8) = g;		\
   315 				*((buf)+2-fmt->Bshift/8) = b;		\
   316 			}						\
   317 		}							\
   318 		break;							\
   319 									\
   320 		case 4: {						\
   321 			Uint32 *bufp;					\
   322 			Uint32 Pixel;					\
   323 									\
   324 			bufp = (Uint32 *)buf;				\
   325 			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
   326 			*bufp = Pixel | (*bufp & Amask);		\
   327 		}							\
   328 		break;							\
   329 	}								\
   330 }
   331 
   332 /* FIXME: Should we rescale alpha into 0..255 here? */
   333 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a)				\
   334 {									\
   335 	r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; 		\
   336 	g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; 		\
   337 	b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; 		\
   338 	a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;	 	\
   339 }
   340 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a)	\
   341 {						\
   342 	r = (Pixel&fmt->Rmask)>>fmt->Rshift;	\
   343 	g = (Pixel&fmt->Gmask)>>fmt->Gshift;	\
   344 	b = (Pixel&fmt->Bmask)>>fmt->Bshift;	\
   345 	a = (Pixel&fmt->Amask)>>fmt->Ashift;	\
   346 }
   347 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a)				\
   348 {									\
   349 	r = (Pixel>>24);						\
   350 	g = ((Pixel>>16)&0xFF);						\
   351 	b = ((Pixel>>8)&0xFF);						\
   352 	a = (Pixel&0xFF);						\
   353 }
   354 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a)				\
   355 {									\
   356 	r = ((Pixel>>16)&0xFF);						\
   357 	g = ((Pixel>>8)&0xFF);						\
   358 	b = (Pixel&0xFF);						\
   359 	a = (Pixel>>24);						\
   360 }
   361 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a)				\
   362 {									\
   363 	r = (Pixel&0xFF);						\
   364 	g = ((Pixel>>8)&0xFF);						\
   365 	b = ((Pixel>>16)&0xFF);						\
   366 	a = (Pixel>>24);						\
   367 }
   368 #define RGBA_FROM_BGRA8888(Pixel, r, g, b, a)				\
   369 {									\
   370 	r = ((Pixel>>8)&0xFF);						\
   371 	g = ((Pixel>>16)&0xFF);						\
   372 	b = (Pixel>>24);						\
   373 	a = (Pixel&0xFF);						\
   374 }
   375 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a)			   \
   376 do {									   \
   377 	switch (bpp) {							   \
   378 		case 2:							   \
   379 			Pixel = *((Uint16 *)(buf));			   \
   380 			RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);	   \
   381 		break;							   \
   382 									   \
   383 		case 3:	{						   \
   384                         if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
   385 			        r = *((buf)+fmt->Rshift/8);		   \
   386 				g = *((buf)+fmt->Gshift/8);		   \
   387 				b = *((buf)+fmt->Bshift/8);		   \
   388 			} else {					   \
   389 			        r = *((buf)+2-fmt->Rshift/8);		   \
   390 				g = *((buf)+2-fmt->Gshift/8);		   \
   391 				b = *((buf)+2-fmt->Bshift/8);		   \
   392 			}						   \
   393 			a = 0xFF;					   \
   394 		}							   \
   395 		break;							   \
   396 									   \
   397 		case 4:							   \
   398 			Pixel = *((Uint32 *)(buf));			   \
   399 			RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);	   \
   400 		break;							   \
   401 									   \
   402 		default:						   \
   403 		        Pixel; /* stop gcc complaints */		   \
   404 		break;							   \
   405 	}								   \
   406 } while (0)
   407 
   408 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
   409 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a)				\
   410 {									\
   411 	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
   412 		((g>>fmt->Gloss)<<fmt->Gshift)|				\
   413 		((b>>fmt->Bloss)<<fmt->Bshift)|				\
   414 		((a>>fmt->Aloss)<<fmt->Ashift);				\
   415 }
   416 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
   417 {									\
   418 	switch (bpp) {							\
   419 		case 2: {						\
   420 			Uint16 Pixel;					\
   421 									\
   422 			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
   423 			*((Uint16 *)(buf)) = Pixel;			\
   424 		}							\
   425 		break;							\
   426 									\
   427 		case 3: {						\
   428                         if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
   429 			        *((buf)+fmt->Rshift/8) = r;		\
   430 				*((buf)+fmt->Gshift/8) = g;		\
   431 				*((buf)+fmt->Bshift/8) = b;		\
   432 			} else {					\
   433 			        *((buf)+2-fmt->Rshift/8) = r;		\
   434 				*((buf)+2-fmt->Gshift/8) = g;		\
   435 				*((buf)+2-fmt->Bshift/8) = b;		\
   436 			}						\
   437 		}							\
   438 		break;							\
   439 									\
   440 		case 4: {						\
   441 			Uint32 Pixel;					\
   442 									\
   443 			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
   444 			*((Uint32 *)(buf)) = Pixel;			\
   445 		}							\
   446 		break;							\
   447 	}								\
   448 }
   449 
   450 /* Blend the RGB values of two Pixels based on a source alpha value */
   451 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
   452 do {						\
   453 	dR = ((((int)(sR-dR)*(int)A)/255)+dR);	\
   454 	dG = ((((int)(sG-dG)*(int)A)/255)+dG);	\
   455 	dB = ((((int)(sB-dB)*(int)A)/255)+dB);	\
   456 } while(0)
   457 
   458 
   459 /* This is a very useful loop for optimizing blitters */
   460 #if defined(_MSC_VER) && (_MSC_VER == 1300)
   461 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */
   462 #else
   463 #define USE_DUFFS_LOOP
   464 #endif
   465 #ifdef USE_DUFFS_LOOP
   466 
   467 /* 8-times unrolled loop */
   468 #define DUFFS_LOOP8(pixel_copy_increment, width)			\
   469 { int n = (width+7)/8;							\
   470 	switch (width & 7) {						\
   471 	case 0: do {	pixel_copy_increment;				\
   472 	case 7:		pixel_copy_increment;				\
   473 	case 6:		pixel_copy_increment;				\
   474 	case 5:		pixel_copy_increment;				\
   475 	case 4:		pixel_copy_increment;				\
   476 	case 3:		pixel_copy_increment;				\
   477 	case 2:		pixel_copy_increment;				\
   478 	case 1:		pixel_copy_increment;				\
   479 		} while ( --n > 0 );					\
   480 	}								\
   481 }
   482 
   483 /* 4-times unrolled loop */
   484 #define DUFFS_LOOP4(pixel_copy_increment, width)			\
   485 { int n = (width+3)/4;							\
   486 	switch (width & 3) {						\
   487 	case 0: do {	pixel_copy_increment;				\
   488 	case 3:		pixel_copy_increment;				\
   489 	case 2:		pixel_copy_increment;				\
   490 	case 1:		pixel_copy_increment;				\
   491 		} while (--n > 0);					\
   492 	}								\
   493 }
   494 
   495 /* Use the 8-times version of the loop by default */
   496 #define DUFFS_LOOP(pixel_copy_increment, width)				\
   497 	DUFFS_LOOP8(pixel_copy_increment, width)
   498 
   499 /* Special version of Duff's device for even more optimization */
   500 #define DUFFS_LOOP_124(pixel_copy_increment1,				\
   501                        pixel_copy_increment2,				\
   502                        pixel_copy_increment4, width)			\
   503 { int n = width;							\
   504 	if (n & 1) {							\
   505 		pixel_copy_increment1; n -= 1;				\
   506 	}								\
   507 	if (n & 2) {							\
   508 		pixel_copy_increment2; n -= 2;				\
   509 	}								\
   510 	if (n) {							\
   511 		n = (n+7)/ 8;						\
   512 		switch (n & 4) {					\
   513 		case 0: do {	pixel_copy_increment4;			\
   514 		case 4:		pixel_copy_increment4;			\
   515 			} while (--n > 0);				\
   516 		}							\
   517 	}								\
   518 }
   519 
   520 #else
   521 
   522 /* Don't use Duff's device to unroll loops */
   523 #define DUFFS_LOOP(pixel_copy_increment, width)				\
   524 { int n;								\
   525 	for ( n=width; n > 0; --n ) {					\
   526 		pixel_copy_increment;					\
   527 	}								\
   528 }
   529 #define DUFFS_LOOP8(pixel_copy_increment, width)			\
   530 	DUFFS_LOOP(pixel_copy_increment, width)
   531 #define DUFFS_LOOP4(pixel_copy_increment, width)			\
   532 	DUFFS_LOOP(pixel_copy_increment, width)
   533 #define DUFFS_LOOP_124(pixel_copy_increment1,				\
   534                        pixel_copy_increment2,				\
   535                        pixel_copy_increment4, width)			\
   536 	DUFFS_LOOP(pixel_copy_increment1, width)
   537 
   538 #endif /* USE_DUFFS_LOOP */
   539 
   540 /* Prevent Visual C++ 6.0 from printing out stupid warnings */
   541 #if defined(_MSC_VER) && (_MSC_VER >= 600)
   542 #pragma warning(disable: 4550)
   543 #endif
   544 
   545 #endif /* _SDL_blit_h */
   546 
   547 /* vi: set ts=4 sw=4 expandtab: */