src/video/SDL_video.c
author Patrice Mandin
Wed, 25 Jan 2006 18:11:56 +0000
changeset 1266 a7bea6db3c3e
parent 1257 448a9a64537b
child 1296 f418917e0b7a
permissions -rw-r--r--
SDL_GetVideoMode, part 3: pixel count compare was failing when only 1 video mode was present
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2004 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 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     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /* The high-level video driver subsystem */
    29 
    30 #include <stdio.h>
    31 #include <stdlib.h>
    32 #include <string.h>
    33 
    34 #include "SDL.h"
    35 #include "SDL_error.h"
    36 #include "SDL_video.h"
    37 #include "SDL_events.h"
    38 #include "SDL_mutex.h"
    39 #include "SDL_sysvideo.h"
    40 #include "SDL_sysevents.h"
    41 #include "SDL_blit.h"
    42 #include "SDL_pixels_c.h"
    43 #include "SDL_events_c.h"
    44 #include "SDL_cursor_c.h"
    45 
    46 /* Available video drivers */
    47 static VideoBootStrap *bootstrap[] = {
    48 #ifdef ENABLE_QUARTZ
    49 	&QZ_bootstrap,
    50 #endif
    51 #ifdef ENABLE_X11
    52 	&X11_bootstrap,
    53 #endif
    54 #ifdef ENABLE_DGA
    55 	&DGA_bootstrap,
    56 #endif
    57 #ifdef ENABLE_NANOX
    58 	&NX_bootstrap,
    59 #endif
    60 #ifdef ENABLE_IPOD
    61 	&iPod_bootstrap,
    62 #endif
    63 #ifdef ENABLE_QTOPIA
    64 	&Qtopia_bootstrap,
    65 #endif
    66 #ifdef ENABLE_WSCONS
    67 	&WSCONS_bootstrap,
    68 #endif
    69 #ifdef ENABLE_FBCON
    70 	&FBCON_bootstrap,
    71 #endif
    72 #ifdef ENABLE_DIRECTFB
    73 	&DirectFB_bootstrap,
    74 #endif
    75 #ifdef ENABLE_PS2GS
    76 	&PS2GS_bootstrap,
    77 #endif
    78 #ifdef ENABLE_GGI
    79 	&GGI_bootstrap,
    80 #endif
    81 #ifdef ENABLE_VGL
    82 	&VGL_bootstrap,
    83 #endif
    84 #ifdef ENABLE_SVGALIB
    85 	&SVGALIB_bootstrap,
    86 #endif
    87 #ifdef ENABLE_AALIB
    88 	&AALIB_bootstrap,
    89 #endif
    90 #ifdef ENABLE_GAPI
    91 	&GAPI_bootstrap,
    92 #endif
    93 #ifdef ENABLE_WINDIB
    94 	&WINDIB_bootstrap,
    95 #endif
    96 #ifdef ENABLE_DIRECTX
    97 	&DIRECTX_bootstrap,
    98 #endif
    99 #ifdef ENABLE_BWINDOW
   100 	&BWINDOW_bootstrap,
   101 #endif
   102 #ifdef ENABLE_TOOLBOX
   103 	&TOOLBOX_bootstrap,
   104 #endif
   105 #ifdef ENABLE_DRAWSPROCKET
   106 	&DSp_bootstrap,
   107 #endif
   108 #ifdef ENABLE_CYBERGRAPHICS
   109 	&CGX_bootstrap,
   110 #endif
   111 #ifdef ENABLE_PHOTON
   112 	&ph_bootstrap,
   113 #endif
   114 #ifdef ENABLE_EPOC
   115 	&EPOC_bootstrap,
   116 #endif
   117 #ifdef ENABLE_XBIOS
   118 	&XBIOS_bootstrap,
   119 #endif
   120 #ifdef ENABLE_GEM
   121 	&GEM_bootstrap,
   122 #endif
   123 #ifdef ENABLE_PICOGUI
   124 	&PG_bootstrap,
   125 #endif
   126 #ifdef ENABLE_DC
   127 	&DC_bootstrap,
   128 #endif
   129 #ifdef ENABLE_RISCOS
   130 	&RISCOS_bootstrap,
   131 #endif
   132 #ifdef __OS2__
   133 	&OS2FSLib_bootstrap,
   134 #endif
   135 #ifdef ENABLE_DUMMYVIDEO
   136 	&DUMMY_bootstrap,
   137 #endif
   138 	NULL
   139 };
   140 
   141 SDL_VideoDevice *current_video = NULL;
   142 
   143 /* Various local functions */
   144 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   145 void SDL_VideoQuit(void);
   146 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect* rects);
   147 
   148 static SDL_GrabMode SDL_WM_GrabInputOff(void);
   149 #ifdef HAVE_OPENGL
   150 static int lock_count = 0;
   151 #endif
   152 
   153 
   154 /*
   155  * Initialize the video and event subsystems -- determine native pixel format
   156  */
   157 int SDL_VideoInit (const char *driver_name, Uint32 flags)
   158 {
   159 	SDL_VideoDevice *video;
   160 	int index;
   161 	int i;
   162 	SDL_PixelFormat vformat;
   163 	Uint32 video_flags;
   164 
   165 	/* Toggle the event thread flags, based on OS requirements */
   166 #if defined(MUST_THREAD_EVENTS)
   167 	flags |= SDL_INIT_EVENTTHREAD;
   168 #elif defined(CANT_THREAD_EVENTS)
   169 	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
   170 		SDL_SetError("OS doesn't support threaded events");
   171 		return(-1);
   172 	}
   173 #endif
   174 
   175 	/* Check to make sure we don't overwrite 'current_video' */
   176 	if ( current_video != NULL ) {
   177 		SDL_VideoQuit();
   178 	}
   179 
   180 	/* Select the proper video driver */
   181 	index = 0;
   182 	video = NULL;
   183 	if ( driver_name != NULL ) {
   184 #if 0	/* This will be replaced with a better driver selection API */
   185 		if ( strrchr(driver_name, ':') != NULL ) {
   186 			index = atoi(strrchr(driver_name, ':')+1);
   187 		}
   188 #endif
   189 		for ( i=0; bootstrap[i]; ++i ) {
   190 			if ( strncmp(bootstrap[i]->name, driver_name,
   191 			             strlen(bootstrap[i]->name)) == 0 ) {
   192 				if ( bootstrap[i]->available() ) {
   193 					video = bootstrap[i]->create(index);
   194 					break;
   195 				}
   196 			}
   197 		}
   198 	} else {
   199 		for ( i=0; bootstrap[i]; ++i ) {
   200 			if ( bootstrap[i]->available() ) {
   201 				video = bootstrap[i]->create(index);
   202 				if ( video != NULL ) {
   203 					break;
   204 				}
   205 			}
   206 		}
   207 	}
   208 	if ( video == NULL ) {
   209 		SDL_SetError("No available video device");
   210 		return(-1);
   211 	}
   212 	current_video = video;
   213 	current_video->name = bootstrap[i]->name;
   214 
   215 	/* Do some basic variable initialization */
   216 	video->screen = NULL;
   217 	video->shadow = NULL;
   218 	video->visible = NULL;
   219 	video->physpal = NULL;
   220 	video->gammacols = NULL;
   221 	video->gamma = NULL;
   222 	video->wm_title = NULL;
   223 	video->wm_icon  = NULL;
   224 	video->offset_x = 0;
   225 	video->offset_y = 0;
   226 	memset(&video->info, 0, (sizeof video->info));
   227 	
   228 	video->displayformatalphapixel = NULL;
   229 
   230 	/* Set some very sane GL defaults */
   231 	video->gl_config.driver_loaded = 0;
   232 	video->gl_config.dll_handle = NULL;
   233 	video->gl_config.red_size = 5;
   234 #if 1 /* This seems to work on more video cards, as a default */
   235 	video->gl_config.green_size = 5;
   236 #else
   237 	video->gl_config.green_size = 6;
   238 #endif
   239 	video->gl_config.blue_size = 5;
   240 	video->gl_config.alpha_size = 0;
   241 	video->gl_config.buffer_size = 0;
   242 	video->gl_config.depth_size = 16;
   243 	video->gl_config.stencil_size = 0;
   244 	video->gl_config.double_buffer = 1;
   245 	video->gl_config.accum_red_size = 0;
   246 	video->gl_config.accum_green_size = 0;
   247 	video->gl_config.accum_blue_size = 0;
   248 	video->gl_config.accum_alpha_size = 0;
   249 	video->gl_config.stereo = 0;
   250 	video->gl_config.multisamplebuffers = 0;
   251 	video->gl_config.multisamplesamples = 0;
   252 	
   253 	/* Initialize the video subsystem */
   254 	memset(&vformat, 0, sizeof(vformat));
   255 	if ( video->VideoInit(video, &vformat) < 0 ) {
   256 		SDL_VideoQuit();
   257 		return(-1);
   258 	}
   259 
   260 	/* Create a zero sized video surface of the appropriate format */
   261 	video_flags = SDL_SWSURFACE;
   262 	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,
   263 				vformat.BitsPerPixel,
   264 				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);
   265 	if ( SDL_VideoSurface == NULL ) {
   266 		SDL_VideoQuit();
   267 		return(-1);
   268 	}
   269 	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */
   270 
   271 #if 0 /* Don't change the current palette - may be used by other programs.
   272        * The application can't do anything with the display surface until
   273        * a video mode has been set anyway. :)
   274        */
   275 	/* If we have a palettized surface, create a default palette */
   276 	if ( SDL_VideoSurface->format->palette ) {
   277 		SDL_PixelFormat *vf = SDL_VideoSurface->format;
   278 		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   279 		video->SetColors(video,
   280 				 0, vf->palette->ncolors, vf->palette->colors);
   281 	}
   282 #endif
   283 	video->info.vfmt = SDL_VideoSurface->format;
   284 
   285 	/* Start the event loop */
   286 	if ( SDL_StartEventLoop(flags) < 0 ) {
   287 		SDL_VideoQuit();
   288 		return(-1);
   289 	}
   290 	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);
   291 
   292 	/* We're ready to go! */
   293 	return(0);
   294 }
   295 
   296 char *SDL_VideoDriverName(char *namebuf, int maxlen)
   297 {
   298 	if ( current_video != NULL ) {
   299 		strncpy(namebuf, current_video->name, maxlen-1);
   300 		namebuf[maxlen-1] = '\0';
   301 		return(namebuf);
   302 	}
   303 	return(NULL);
   304 }
   305 
   306 /*
   307  * Get the current display surface
   308  */
   309 SDL_Surface *SDL_GetVideoSurface(void)
   310 {
   311 	SDL_Surface *visible;
   312 
   313 	visible = NULL;
   314 	if ( current_video ) {
   315 		visible = current_video->visible;
   316 	}
   317 	return(visible);
   318 }
   319 
   320 /*
   321  * Get the current information about the video hardware
   322  */
   323 const SDL_VideoInfo *SDL_GetVideoInfo(void)
   324 {
   325 	const SDL_VideoInfo *info;
   326 
   327 	info = NULL;
   328 	if ( current_video ) {
   329 		info = &current_video->info;
   330 	}
   331 	return(info);
   332 }
   333 
   334 /*
   335  * Return a pointer to an array of available screen dimensions for the
   336  * given format, sorted largest to smallest.  Returns NULL if there are
   337  * no dimensions available for a particular format, or (SDL_Rect **)-1
   338  * if any dimension is okay for the given format.  If 'format' is NULL,
   339  * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt
   340  */
   341 SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)
   342 {
   343 	SDL_VideoDevice *video = current_video;
   344 	SDL_VideoDevice *this  = current_video;
   345 	SDL_Rect **modes;
   346 
   347 	modes = NULL;
   348 	if ( SDL_VideoSurface ) {
   349 		if ( format == NULL ) {
   350 			format = SDL_VideoSurface->format;
   351 		}
   352 		modes = video->ListModes(this, format, flags);
   353 	}
   354 	return(modes);
   355 }
   356 
   357 /*
   358  * Check to see if a particular video mode is supported.
   359  * It returns 0 if the requested mode is not supported under any bit depth,
   360  * or returns the bits-per-pixel of the closest available mode with the
   361  * given width and height.  If this bits-per-pixel is different from the
   362  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
   363  * but will emulate the requested bits-per-pixel with a shadow surface.
   364  */
   365 static Uint8 SDL_closest_depths[4][8] = {
   366 	/* 8 bit closest depth ordering */
   367 	{ 0, 8, 16, 15, 32, 24, 0, 0 },
   368 	/* 15,16 bit closest depth ordering */
   369 	{ 0, 16, 15, 32, 24, 8, 0, 0 },
   370 	/* 24 bit closest depth ordering */
   371 	{ 0, 24, 32, 16, 15, 8, 0, 0 },
   372 	/* 32 bit closest depth ordering */
   373 	{ 0, 32, 16, 15, 24, 8, 0, 0 }
   374 };
   375 
   376 
   377 #ifdef macintosh /* MPW optimization bug? */
   378 #define NEGATIVE_ONE 0xFFFFFFFF
   379 #else
   380 #define NEGATIVE_ONE -1
   381 #endif
   382 
   383 int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
   384 {
   385 	int table, b, i;
   386 	int supported;
   387 	SDL_PixelFormat format;
   388 	SDL_Rect **sizes;
   389 
   390 	/* Currently 1 and 4 bpp are not supported */
   391 	if ( bpp < 8 || bpp > 32 ) {
   392 		return(0);
   393 	}
   394 	if ( (width <= 0) || (height <= 0) ) {
   395 		return(0);
   396 	}
   397 
   398 	/* Search through the list valid of modes */
   399 	memset(&format, 0, sizeof(format));
   400 	supported = 0;
   401 	table = ((bpp+7)/8)-1;
   402 	SDL_closest_depths[table][0] = bpp;
   403 	SDL_closest_depths[table][7] = 0;
   404 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   405 		format.BitsPerPixel = SDL_closest_depths[table][b];
   406 		sizes = SDL_ListModes(&format, flags);
   407 		if ( sizes == (SDL_Rect **)0 ) {
   408 			/* No sizes supported at this bit-depth */
   409 			continue;
   410 		} else 
   411 		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
   412 			/* Any size supported at this bit-depth */
   413 			supported = 1;
   414 			continue;
   415 		} else if (current_video->handles_any_size) {
   416 			/* Driver can center a smaller surface to simulate fullscreen */
   417 			for ( i=0; sizes[i]; ++i ) {
   418 				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {
   419 					supported = 1; /* this mode can fit the centered window. */
   420 					break;
   421 				}
   422 			}
   423 		} else
   424 		for ( i=0; sizes[i]; ++i ) {
   425 			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {
   426 				supported = 1;
   427 				break;
   428 			}
   429 		}
   430 	}
   431 	if ( supported ) {
   432 		--b;
   433 		return(SDL_closest_depths[table][b]);
   434 	} else {
   435 		return(0);
   436 	}
   437 }
   438 
   439 /*
   440  * Get the closest non-emulated video mode to the one requested
   441  */
   442 static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)
   443 {
   444 	int table, b, i;
   445 	int supported;
   446 	int native_bpp;
   447 	SDL_PixelFormat format;
   448 	SDL_Rect **sizes;
   449 
   450 	/* Check parameters */
   451 	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
   452 		SDL_SetError("Invalid bits per pixel (range is {8...32})");
   453 		return(0);
   454 	}
   455 	if ((*w <= 0) || (*h <= 0)) {
   456 		SDL_SetError("Invalid width or height");
   457 		return(0);
   458 	}
   459 
   460 	/* Try the original video mode, get the closest depth */
   461 	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);
   462 	if ( native_bpp == *BitsPerPixel ) {
   463 		return(1);
   464 	}
   465 	if ( native_bpp > 0 ) {
   466 		*BitsPerPixel = native_bpp;
   467 		return(1);
   468 	}
   469 
   470 	/* No exact size match at any depth, look for closest match */
   471 	memset(&format, 0, sizeof(format));
   472 	supported = 0;
   473 	table = ((*BitsPerPixel+7)/8)-1;
   474 	SDL_closest_depths[table][0] = *BitsPerPixel;
   475 	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;
   476 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   477 		int best;
   478 
   479 		format.BitsPerPixel = SDL_closest_depths[table][b];
   480 		sizes = SDL_ListModes(&format, flags);
   481 		if ( sizes == (SDL_Rect **)0 ) {
   482 			/* No sizes supported at this bit-depth */
   483 			continue;
   484 		}
   485 		best=0;
   486 		for ( i=0; sizes[i]; ++i ) {
   487 			/* Mode with both dimensions bigger or equal than asked ? */
   488 			if ((sizes[i]->w >= *w) && (sizes[i]->h >= *h)) {
   489 				/* Mode with any dimension smaller or equal than current best ? */
   490 				if ((sizes[i]->w <= sizes[best]->w) || (sizes[i]->h <= sizes[best]->h)) {
   491 					/* Now choose the mode that has less pixels */
   492 					if ((sizes[i]->w * sizes[i]->h) <= (sizes[best]->w * sizes[best]->h)) {
   493 						best=i;
   494 						supported = 1;
   495 					}
   496 				}
   497 			}
   498 		}
   499 		if (supported) {
   500 			*w=sizes[best]->w;
   501 			*h=sizes[best]->h;
   502 			*BitsPerPixel = SDL_closest_depths[table][b];
   503 		}
   504 	}
   505 	if ( ! supported ) {
   506 		SDL_SetError("No video mode large enough for %dx%d", *w, *h);
   507 	}
   508 	return(supported);
   509 }
   510 
   511 /* This should probably go somewhere else -- like SDL_surface.c */
   512 static void SDL_ClearSurface(SDL_Surface *surface)
   513 {
   514 	Uint32 black;
   515 
   516 	black = SDL_MapRGB(surface->format, 0, 0, 0);
   517 	SDL_FillRect(surface, NULL, black);
   518 	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {
   519 		SDL_Flip(surface);
   520 		SDL_FillRect(surface, NULL, black);
   521 	}
   522 	SDL_Flip(surface);
   523 }
   524 
   525 /*
   526  * Create a shadow surface suitable for fooling the app. :-)
   527  */
   528 static void SDL_CreateShadowSurface(int depth)
   529 {
   530 	Uint32 Rmask, Gmask, Bmask;
   531 
   532 	/* Allocate the shadow surface */
   533 	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   534 		Rmask = (SDL_VideoSurface->format)->Rmask;
   535 		Gmask = (SDL_VideoSurface->format)->Gmask;
   536 		Bmask = (SDL_VideoSurface->format)->Bmask;
   537 	} else {
   538 		Rmask = Gmask = Bmask = 0;
   539 	}
   540 	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
   541 				SDL_VideoSurface->w, SDL_VideoSurface->h,
   542 						depth, Rmask, Gmask, Bmask, 0);
   543 	if ( SDL_ShadowSurface == NULL ) {
   544 		return;
   545 	}
   546 
   547 	/* 8-bit shadow surfaces report that they have exclusive palette */
   548 	if ( SDL_ShadowSurface->format->palette ) {
   549 		SDL_ShadowSurface->flags |= SDL_HWPALETTE;
   550 		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   551 			memcpy(SDL_ShadowSurface->format->palette->colors,
   552 				SDL_VideoSurface->format->palette->colors,
   553 				SDL_VideoSurface->format->palette->ncolors*
   554 							sizeof(SDL_Color));
   555 		} else {
   556 			SDL_DitherColors(
   557 			SDL_ShadowSurface->format->palette->colors, depth);
   558 		}
   559 	}
   560 
   561 	/* If the video surface is resizable, the shadow should say so */
   562 	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {
   563 		SDL_ShadowSurface->flags |= SDL_RESIZABLE;
   564 	}
   565 	/* If the video surface has no frame, the shadow should say so */
   566 	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {
   567 		SDL_ShadowSurface->flags |= SDL_NOFRAME;
   568 	}
   569 	/* If the video surface is fullscreen, the shadow should say so */
   570 	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
   571 		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;
   572 	}
   573 	/* If the video surface is flippable, the shadow should say so */
   574 	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   575 		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;
   576 	}
   577 	return;
   578 }
   579 
   580 #ifdef __QNXNTO__
   581     #include <sys/neutrino.h>
   582 #endif /* __QNXNTO__ */
   583 
   584 /*
   585  * Set the requested video mode, allocating a shadow buffer if necessary.
   586  */
   587 SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
   588 {
   589 	SDL_VideoDevice *video, *this;
   590 	SDL_Surface *prev_mode, *mode;
   591 	int video_w;
   592 	int video_h;
   593 	int video_bpp;
   594 	int is_opengl;
   595 	SDL_GrabMode saved_grab;
   596 
   597 	/* Start up the video driver, if necessary..
   598 	   WARNING: This is the only function protected this way!
   599 	 */
   600 	if ( ! current_video ) {
   601 		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {
   602 			return(NULL);
   603 		}
   604 	}
   605 	this = video = current_video;
   606 
   607 	/* Default to the current video bpp */
   608 	if ( bpp == 0 ) {
   609 		flags |= SDL_ANYFORMAT;
   610 		bpp = SDL_VideoSurface->format->BitsPerPixel;
   611 	}
   612 
   613 	/* Get a good video mode, the closest one possible */
   614 	video_w = width;
   615 	video_h = height;
   616 	video_bpp = bpp;
   617 	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {
   618 		return(NULL);
   619 	}
   620 
   621 	/* Check the requested flags */
   622 	/* There's no palette in > 8 bits-per-pixel mode */
   623 	if ( video_bpp > 8 ) {
   624 		flags &= ~SDL_HWPALETTE;
   625 	}
   626 #if 0
   627 	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {
   628 		/* There's no windowed double-buffering */
   629 		flags &= ~SDL_DOUBLEBUF;
   630 	}
   631 #endif
   632 	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   633 		/* Use hardware surfaces when double-buffering */
   634 		flags |= SDL_HWSURFACE;
   635 	}
   636 
   637 	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );
   638 	if ( is_opengl ) {
   639 		/* These flags are for 2D video modes only */
   640 		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);
   641 	}
   642 
   643 	/* Reset the keyboard here so event callbacks can run */
   644 	SDL_ResetKeyboard();
   645 	SDL_ResetMouse();
   646 
   647 	/* Clean up any previous video mode */
   648 	if ( SDL_PublicSurface != NULL ) {
   649 		SDL_PublicSurface = NULL;
   650 	}
   651 	if ( SDL_ShadowSurface != NULL ) {
   652 		SDL_Surface *ready_to_go;
   653 		ready_to_go = SDL_ShadowSurface;
   654 		SDL_ShadowSurface = NULL;
   655 		SDL_FreeSurface(ready_to_go);
   656 	}
   657 	if ( video->physpal ) {
   658 		free(video->physpal->colors);
   659 		free(video->physpal);
   660 		video->physpal = NULL;
   661 	}
   662 	if( video->gammacols) {
   663 		free(video->gammacols);
   664 		video->gammacols = NULL;
   665 	}
   666 
   667 	/* Save the previous grab state and turn off grab for mode switch */
   668 	saved_grab = SDL_WM_GrabInputOff();
   669 
   670 	/* Try to set the video mode, along with offset and clipping */
   671 	prev_mode = SDL_VideoSurface;
   672 	SDL_LockCursor();
   673 	SDL_VideoSurface = NULL;	/* In case it's freed by driver */
   674 	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);
   675 	if ( mode ) { /* Prevent resize events from mode change */
   676           /* But not on OS/2 */
   677 #ifndef __OS2__
   678 	    SDL_PrivateResize(mode->w, mode->h);
   679 #endif
   680 
   681 	    /* Sam - If we asked for OpenGL mode, and didn't get it, fail */
   682 	    if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {
   683 		mode = NULL;
   684 		SDL_SetError("OpenGL not available");
   685 	    }
   686 	}
   687 	/*
   688 	 * rcg11292000
   689 	 * If you try to set an SDL_OPENGL surface, and fail to find a
   690 	 * matching  visual, then the next call to SDL_SetVideoMode()
   691 	 * will segfault, since  we no longer point to a dummy surface,
   692 	 * but rather NULL.
   693 	 * Sam 11/29/00
   694 	 * WARNING, we need to make sure that the previous mode hasn't
   695 	 * already been freed by the video driver.  What do we do in
   696 	 * that case?  Should we call SDL_VideoInit() again?
   697 	 */
   698 	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;
   699 
   700 	if ( (mode != NULL) && (!is_opengl) ) {
   701 		/* Sanity check */
   702 		if ( (mode->w < width) || (mode->h < height) ) {
   703 			SDL_SetError("Video mode smaller than requested");
   704 			return(NULL);
   705 		}
   706 
   707 		/* If we have a palettized surface, create a default palette */
   708 		if ( mode->format->palette ) {
   709 			SDL_PixelFormat *vf = mode->format;
   710 			SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   711 			video->SetColors(this, 0, vf->palette->ncolors,
   712 			                           vf->palette->colors);
   713 		}
   714 
   715 		/* Clear the surface to black */
   716 		video->offset_x = 0;
   717 		video->offset_y = 0;
   718 		mode->offset = 0;
   719 		SDL_SetClipRect(mode, NULL);
   720 		SDL_ClearSurface(mode);
   721 
   722 		/* Now adjust the offsets to match the desired mode */
   723 		video->offset_x = (mode->w-width)/2;
   724 		video->offset_y = (mode->h-height)/2;
   725 		mode->offset = video->offset_y*mode->pitch +
   726 				video->offset_x*mode->format->BytesPerPixel;
   727 #ifdef DEBUG_VIDEO
   728   fprintf(stderr,
   729 	"Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",
   730 		width, height, bpp,
   731 		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);
   732 #endif
   733 		mode->w = width;
   734 		mode->h = height;
   735 		SDL_SetClipRect(mode, NULL);
   736 	}
   737 	SDL_ResetCursor();
   738 	SDL_UnlockCursor();
   739 
   740 	/* If we failed setting a video mode, return NULL... (Uh Oh!) */
   741 	if ( mode == NULL ) {
   742 		return(NULL);
   743 	}
   744 
   745 	/* If there is no window manager, set the SDL_NOFRAME flag */
   746 	if ( ! video->info.wm_available ) {
   747 		mode->flags |= SDL_NOFRAME;
   748 	}
   749 
   750 	/* Reset the mouse cursor and grab for new video mode */
   751 	SDL_SetCursor(NULL);
   752 	if ( video->UpdateMouse ) {
   753 		video->UpdateMouse(this);
   754 	}
   755 	SDL_WM_GrabInput(saved_grab);
   756 	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */
   757 
   758 #ifdef HAVE_OPENGL
   759 	/* Load GL symbols (before MakeCurrent, where we need glGetString). */
   760 	if ( flags & (SDL_OPENGL | SDL_OPENGLBLIT) ) {
   761 
   762 #if defined(__QNXNTO__) && (_NTO_VERSION < 630)
   763 #define __SDL_NOGETPROCADDR__
   764 #elif defined(__MINT__)
   765 #define __SDL_NOGETPROCADDR__
   766 #endif
   767 #ifdef __SDL_NOGETPROCADDR__
   768     #define SDL_PROC(ret,func,params) video->func=func;
   769 #else
   770     #define SDL_PROC(ret,func,params) \
   771     do { \
   772         video->func = SDL_GL_GetProcAddress(#func); \
   773         if ( ! video->func ) { \
   774             SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
   775         return(NULL); \
   776         } \
   777     } while ( 0 );
   778 
   779 #endif /* __SDL_NOGETPROCADDR__ */
   780 
   781 #include "SDL_glfuncs.h"
   782 #undef SDL_PROC	
   783 	}
   784 #endif /* HAVE_OPENGL */
   785 
   786 	/* If we're running OpenGL, make the context current */
   787 	if ( (video->screen->flags & SDL_OPENGL) &&
   788 	      video->GL_MakeCurrent ) {
   789 		if ( video->GL_MakeCurrent(this) < 0 ) {
   790 			return(NULL);
   791 		}
   792 	}
   793 
   794 	/* Set up a fake SDL surface for OpenGL "blitting" */
   795 	if ( (flags & SDL_OPENGLBLIT) == SDL_OPENGLBLIT ) {
   796 		/* Load GL functions for performing the texture updates */
   797 #ifdef HAVE_OPENGL
   798 
   799 		/* Create a software surface for blitting */
   800 #ifdef GL_VERSION_1_2
   801 		/* If the implementation either supports the packed pixels
   802 		   extension, or implements the core OpenGL 1.2 API, it will
   803 		   support the GL_UNSIGNED_SHORT_5_6_5 texture format.
   804 		 */
   805 		if ( (bpp == 16) &&
   806 		     (strstr((const char *)video->glGetString(GL_EXTENSIONS), "GL_EXT_packed_pixels") ||
   807 		     (atof((const char *)video->glGetString(GL_VERSION)) >= 1.2f))
   808 		   ) {
   809 			video->is_32bit = 0;
   810 			SDL_VideoSurface = SDL_CreateRGBSurface(
   811 				flags, 
   812 				width, 
   813 				height,  
   814 				16,
   815 				31 << 11,
   816 				63 << 5,
   817 				31,
   818 				0
   819 				);
   820 		}
   821 		else
   822 #endif /* OpenGL 1.2 */
   823 		{
   824 			video->is_32bit = 1;
   825 			SDL_VideoSurface = SDL_CreateRGBSurface(
   826 				flags, 
   827 				width, 
   828 				height, 
   829 				32, 
   830 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   831 				0x000000FF,
   832 				0x0000FF00,
   833 				0x00FF0000,
   834 				0xFF000000
   835 #else
   836 				0xFF000000,
   837 				0x00FF0000,
   838 				0x0000FF00,
   839 				0x000000FF
   840 #endif
   841 				);
   842 		}
   843 		if ( ! SDL_VideoSurface ) {
   844 			return(NULL);
   845 		}
   846 		SDL_VideoSurface->flags = mode->flags | SDL_OPENGLBLIT;
   847 
   848 		/* Free the original video mode surface (is this safe?) */
   849 		SDL_FreeSurface(mode);
   850 
   851 		/* Set the surface completely opaque & white by default */
   852 		memset( SDL_VideoSurface->pixels, 255, SDL_VideoSurface->h * SDL_VideoSurface->pitch );
   853 		video->glGenTextures( 1, &video->texture );
   854 		video->glBindTexture( GL_TEXTURE_2D, video->texture );
   855 		video->glTexImage2D(
   856 			GL_TEXTURE_2D,
   857 			0,
   858 			video->is_32bit ? GL_RGBA : GL_RGB,
   859 			256,
   860 			256,
   861 			0,
   862 			video->is_32bit ? GL_RGBA : GL_RGB,
   863 #ifdef GL_VERSION_1_2
   864 			video->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
   865 #else
   866 			GL_UNSIGNED_BYTE,
   867 #endif
   868 			NULL);
   869 
   870 		video->UpdateRects = SDL_GL_UpdateRectsLock;
   871 #else
   872 		SDL_SetError("Somebody forgot to #define HAVE_OPENGL");
   873 		return(NULL);
   874 #endif
   875 	}
   876 
   877 	/* Create a shadow surface if necessary */
   878 	/* There are three conditions under which we create a shadow surface:
   879 		1.  We need a particular bits-per-pixel that we didn't get.
   880 		2.  We need a hardware palette and didn't get one.
   881 		3.  We need a software surface and got a hardware surface.
   882 	*/
   883 	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&
   884 	     (
   885 	     (  !(flags&SDL_ANYFORMAT) &&
   886 			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||
   887 	     (   (flags&SDL_HWPALETTE) && 
   888 				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||
   889 		/* If the surface is in hardware, video writes are visible
   890 		   as soon as they are performed, so we need to buffer them
   891 		 */
   892 	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&
   893 				(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
   894 	     (   (flags&SDL_DOUBLEBUF) &&
   895 				(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
   896 				!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
   897 	     ) ) {
   898 		SDL_CreateShadowSurface(bpp);
   899 		if ( SDL_ShadowSurface == NULL ) {
   900 			SDL_SetError("Couldn't create shadow surface");
   901 			return(NULL);
   902 		}
   903 		SDL_PublicSurface = SDL_ShadowSurface;
   904 	} else {
   905 		SDL_PublicSurface = SDL_VideoSurface;
   906 	}
   907 	video->info.vfmt = SDL_VideoSurface->format;
   908 
   909 	/* We're done! */
   910 	return(SDL_PublicSurface);
   911 }
   912 
   913 /* 
   914  * Convert a surface into the video pixel format.
   915  */
   916 SDL_Surface * SDL_DisplayFormat (SDL_Surface *surface)
   917 {
   918 	Uint32 flags;
   919 
   920 	if ( ! SDL_PublicSurface ) {
   921 		SDL_SetError("No video mode has been set");
   922 		return(NULL);
   923 	}
   924 	/* Set the flags appropriate for copying to display surface */
   925 	if (((SDL_PublicSurface->flags&SDL_HWSURFACE) == SDL_HWSURFACE) && current_video->info.blit_hw)
   926 		flags = SDL_HWSURFACE;
   927 	else 
   928 		flags = SDL_SWSURFACE;
   929 #ifdef AUTORLE_DISPLAYFORMAT
   930 	flags |= (surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA));
   931 	flags |= SDL_RLEACCELOK;
   932 #else
   933 	flags |= surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA|SDL_RLEACCELOK);
   934 #endif
   935 	return(SDL_ConvertSurface(surface, SDL_PublicSurface->format, flags));
   936 }
   937 
   938 /*
   939  * Convert a surface into a format that's suitable for blitting to
   940  * the screen, but including an alpha channel.
   941  */
   942 SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface)
   943 {
   944 	SDL_PixelFormat *vf;
   945 	SDL_PixelFormat *format;
   946 	SDL_Surface *converted;
   947 	Uint32 flags;
   948 	/* default to ARGB8888 */
   949 	Uint32 amask = 0xff000000;
   950 	Uint32 rmask = 0x00ff0000;
   951 	Uint32 gmask = 0x0000ff00;
   952 	Uint32 bmask = 0x000000ff;
   953 
   954 	if ( ! SDL_PublicSurface ) {
   955 		SDL_SetError("No video mode has been set");
   956 		return(NULL);
   957 	}
   958 	vf = SDL_PublicSurface->format;
   959 
   960 	switch(vf->BytesPerPixel) {
   961 	    case 2:
   962 		/* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.
   963 		   For anything else (like ARGB4444) it doesn't matter
   964 		   since we have no special code for it anyway */
   965 		if ( (vf->Rmask == 0x1f) &&
   966 		     (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {
   967 			rmask = 0xff;
   968 			bmask = 0xff0000;
   969 		}
   970 		break;
   971 
   972 	    case 3:
   973 	    case 4:
   974 		/* Keep the video format, as long as the high 8 bits are
   975 		   unused or alpha */
   976 		if ( (vf->Rmask == 0xff) && (vf->Bmask == 0xff0000) ) {
   977 			rmask = 0xff;
   978 			bmask = 0xff0000;
   979 		}
   980 		break;
   981 
   982 	    default:
   983 		/* We have no other optimised formats right now. When/if a new
   984 		   optimised alpha format is written, add the converter here */
   985 		break;
   986 	}
   987 	format = SDL_AllocFormat(32, rmask, gmask, bmask, amask);
   988 	flags = SDL_PublicSurface->flags & SDL_HWSURFACE;
   989 	flags |= surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
   990 	converted = SDL_ConvertSurface(surface, format, flags);
   991 	SDL_FreeFormat(format);
   992 	return(converted);
   993 }
   994 
   995 /*
   996  * Update a specific portion of the physical screen
   997  */
   998 void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
   999 {
  1000 	if ( screen ) {
  1001 		SDL_Rect rect;
  1002 
  1003 		/* Perform some checking */
  1004 		if ( w == 0 )
  1005 			w = screen->w;
  1006 		if ( h == 0 )
  1007 			h = screen->h;
  1008 		if ( (int)(x+w) > screen->w )
  1009 			return;
  1010 		if ( (int)(y+h) > screen->h )
  1011 			return;
  1012 
  1013 		/* Fill the rectangle */
  1014 		rect.x = x;
  1015 		rect.y = y;
  1016 		rect.w = w;
  1017 		rect.h = h;
  1018 		SDL_UpdateRects(screen, 1, &rect);
  1019 	}
  1020 }
  1021 void SDL_UpdateRects (SDL_Surface *screen, int numrects, SDL_Rect *rects)
  1022 {
  1023 	int i;
  1024 	SDL_VideoDevice *video = current_video;
  1025 	SDL_VideoDevice *this = current_video;
  1026 
  1027 	if ( screen == SDL_ShadowSurface ) {
  1028 		/* Blit the shadow surface using saved mapping */
  1029 		SDL_Palette *pal = screen->format->palette;
  1030 		SDL_Color *saved_colors = NULL;
  1031 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1032 			/* simulated 8bpp, use correct physical palette */
  1033 			saved_colors = pal->colors;
  1034 			if ( video->gammacols ) {
  1035 				/* gamma-corrected palette */
  1036 				pal->colors = video->gammacols;
  1037 			} else if ( video->physpal ) {
  1038 				/* physical palette different from logical */
  1039 				pal->colors = video->physpal->colors;
  1040 			}
  1041 		}
  1042 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1043 			SDL_LockCursor();
  1044 			SDL_DrawCursor(SDL_ShadowSurface);
  1045 			for ( i=0; i<numrects; ++i ) {
  1046 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1047 						SDL_VideoSurface, &rects[i]);
  1048 			}
  1049 			SDL_EraseCursor(SDL_ShadowSurface);
  1050 			SDL_UnlockCursor();
  1051 		} else {
  1052 			for ( i=0; i<numrects; ++i ) {
  1053 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1054 						SDL_VideoSurface, &rects[i]);
  1055 			}
  1056 		}
  1057 		if ( saved_colors ) {
  1058 			pal->colors = saved_colors;
  1059 		}
  1060 
  1061 		/* Fall through to video surface update */
  1062 		screen = SDL_VideoSurface;
  1063 	}
  1064 	if ( screen == SDL_VideoSurface ) {
  1065 		/* Update the video surface */
  1066 		if ( screen->offset ) {
  1067 			for ( i=0; i<numrects; ++i ) {
  1068 				rects[i].x += video->offset_x;
  1069 				rects[i].y += video->offset_y;
  1070 			}
  1071 			video->UpdateRects(this, numrects, rects);
  1072 			for ( i=0; i<numrects; ++i ) {
  1073 				rects[i].x -= video->offset_x;
  1074 				rects[i].y -= video->offset_y;
  1075 			}
  1076 		} else {
  1077 			video->UpdateRects(this, numrects, rects);
  1078 		}
  1079 	}
  1080 }
  1081 
  1082 /*
  1083  * Performs hardware double buffering, if possible, or a full update if not.
  1084  */
  1085 int SDL_Flip(SDL_Surface *screen)
  1086 {
  1087 	SDL_VideoDevice *video = current_video;
  1088 	/* Copy the shadow surface to the video surface */
  1089 	if ( screen == SDL_ShadowSurface ) {
  1090 		SDL_Rect rect;
  1091 		SDL_Palette *pal = screen->format->palette;
  1092 		SDL_Color *saved_colors = NULL;
  1093 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1094 			/* simulated 8bpp, use correct physical palette */
  1095 			saved_colors = pal->colors;
  1096 			if ( video->gammacols ) {
  1097 				/* gamma-corrected palette */
  1098 				pal->colors = video->gammacols;
  1099 			} else if ( video->physpal ) {
  1100 				/* physical palette different from logical */
  1101 				pal->colors = video->physpal->colors;
  1102 			}
  1103 		}
  1104 
  1105 		rect.x = 0;
  1106 		rect.y = 0;
  1107 		rect.w = screen->w;
  1108 		rect.h = screen->h;
  1109 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1110 			SDL_LockCursor();
  1111 			SDL_DrawCursor(SDL_ShadowSurface);
  1112 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1113 					SDL_VideoSurface, &rect);
  1114 			SDL_EraseCursor(SDL_ShadowSurface);
  1115 			SDL_UnlockCursor();
  1116 		} else {
  1117 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1118 					SDL_VideoSurface, &rect);
  1119 		}
  1120 		if ( saved_colors ) {
  1121 			pal->colors = saved_colors;
  1122 		}
  1123 
  1124 		/* Fall through to video surface update */
  1125 		screen = SDL_VideoSurface;
  1126 	}
  1127 	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  1128 		SDL_VideoDevice *this  = current_video;
  1129 		return(video->FlipHWSurface(this, SDL_VideoSurface));
  1130 	} else {
  1131 		SDL_UpdateRect(screen, 0, 0, 0, 0);
  1132 	}
  1133 	return(0);
  1134 }
  1135 
  1136 static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,
  1137 			       int firstcolor, int ncolors)
  1138 {
  1139 	SDL_Palette *pal = screen->format->palette;
  1140 	SDL_Palette *vidpal;
  1141 
  1142 	if ( colors != (pal->colors + firstcolor) ) {
  1143 		memcpy(pal->colors + firstcolor, colors,
  1144 		       ncolors * sizeof(*colors));
  1145 	}
  1146 
  1147 	vidpal = SDL_VideoSurface->format->palette;
  1148 	if ( (screen == SDL_ShadowSurface) && vidpal ) {
  1149 		/*
  1150 		 * This is a shadow surface, and the physical
  1151 		 * framebuffer is also indexed. Propagate the
  1152 		 * changes to its logical palette so that
  1153 		 * updates are always identity blits
  1154 		 */
  1155 		memcpy(vidpal->colors + firstcolor, colors,
  1156 		       ncolors * sizeof(*colors));
  1157 	}
  1158 	SDL_FormatChanged(screen);
  1159 }
  1160 
  1161 static int SetPalette_physical(SDL_Surface *screen,
  1162                                SDL_Color *colors, int firstcolor, int ncolors)
  1163 {
  1164 	SDL_VideoDevice *video = current_video;
  1165 	int gotall = 1;
  1166 
  1167 	if ( video->physpal ) {
  1168 		/* We need to copy the new colors, since we haven't
  1169 		 * already done the copy in the logical set above.
  1170 		 */
  1171 		memcpy(video->physpal->colors + firstcolor,
  1172 		       colors, ncolors * sizeof(*colors));
  1173 	}
  1174 	if ( screen == SDL_ShadowSurface ) {
  1175 		if ( SDL_VideoSurface->flags & SDL_HWPALETTE ) {
  1176 			/*
  1177 			 * The real screen is also indexed - set its physical
  1178 			 * palette. The physical palette does not include the
  1179 			 * gamma modification, we apply it directly instead,
  1180 			 * but this only happens if we have hardware palette.
  1181 			 */
  1182 			screen = SDL_VideoSurface;
  1183 		} else {
  1184 			/*
  1185 			 * The video surface is not indexed - invalidate any
  1186 			 * active shadow-to-video blit mappings.
  1187 			 */
  1188 			if ( screen->map->dst == SDL_VideoSurface ) {
  1189 				SDL_InvalidateMap(screen->map);
  1190 			}
  1191 			if ( video->gamma ) {
  1192 				if( ! video->gammacols ) {
  1193 					SDL_Palette *pp = video->physpal;
  1194 					if(!pp)
  1195 						pp = screen->format->palette;
  1196 					video->gammacols = malloc(pp->ncolors
  1197 							  * sizeof(SDL_Color));
  1198 					SDL_ApplyGamma(video->gamma,
  1199 						       pp->colors,
  1200 						       video->gammacols,
  1201 						       pp->ncolors);
  1202 				} else {
  1203 					SDL_ApplyGamma(video->gamma, colors,
  1204 						       video->gammacols
  1205 						       + firstcolor,
  1206 						       ncolors);
  1207 				}
  1208 			}
  1209 			SDL_UpdateRect(screen, 0, 0, 0, 0);
  1210 		}
  1211 	}
  1212 
  1213 	if ( screen == SDL_VideoSurface ) {
  1214 		SDL_Color gcolors[256];
  1215 
  1216 		if ( video->gamma ) {
  1217 			SDL_ApplyGamma(video->gamma, colors, gcolors, ncolors);
  1218 			colors = gcolors;
  1219 		}
  1220 		gotall = video->SetColors(video, firstcolor, ncolors, colors);
  1221 		if ( ! gotall ) {
  1222 			/* The video flags shouldn't have SDL_HWPALETTE, and
  1223 			   the video driver is responsible for copying back the
  1224 			   correct colors into the video surface palette.
  1225 			*/
  1226 			;
  1227 		}
  1228 		SDL_CursorPaletteChanged();
  1229 	}
  1230 	return gotall;
  1231 }
  1232 
  1233 /*
  1234  * Set the physical and/or logical colormap of a surface:
  1235  * Only the screen has a physical colormap. It determines what is actually
  1236  * sent to the display.
  1237  * The logical colormap is used to map blits to/from the surface.
  1238  * 'which' is one or both of SDL_LOGPAL, SDL_PHYSPAL
  1239  *
  1240  * Return nonzero if all colours were set as requested, or 0 otherwise.
  1241  */
  1242 int SDL_SetPalette(SDL_Surface *screen, int which,
  1243 		   SDL_Color *colors, int firstcolor, int ncolors)
  1244 {
  1245 	SDL_Palette *pal;
  1246 	int gotall;
  1247 	int palsize;
  1248 
  1249 	if ( ! current_video ) {
  1250 		return 0;
  1251 	}
  1252 	if ( screen != SDL_PublicSurface ) {
  1253 		/* only screens have physical palettes */
  1254 		which &= ~SDL_PHYSPAL;
  1255 	} else if( (screen->flags & SDL_HWPALETTE) != SDL_HWPALETTE ) {
  1256 		/* hardware palettes required for split colormaps */
  1257 		which |= SDL_PHYSPAL | SDL_LOGPAL;
  1258 	}
  1259 
  1260 	/* Verify the parameters */
  1261 	pal = screen->format->palette;
  1262 	if( !pal ) {
  1263 		return 0;	/* not a palettized surface */
  1264 	}
  1265 	gotall = 1;
  1266 	palsize = 1 << screen->format->BitsPerPixel;
  1267 	if ( ncolors > (palsize - firstcolor) ) {
  1268 		ncolors = (palsize - firstcolor);
  1269 		gotall = 0;
  1270 	}
  1271 
  1272 	if ( which & SDL_LOGPAL ) {
  1273 		/*
  1274 		 * Logical palette change: The actual screen isn't affected,
  1275 		 * but the internal colormap is altered so that the
  1276 		 * interpretation of the pixel values (for blits etc) is
  1277 		 * changed.
  1278 		 */
  1279 		SetPalette_logical(screen, colors, firstcolor, ncolors);
  1280 	}
  1281 	if ( which & SDL_PHYSPAL ) {
  1282 		SDL_VideoDevice *video = current_video;
  1283 		/*
  1284 		 * Physical palette change: This doesn't affect the
  1285 		 * program's idea of what the screen looks like, but changes
  1286 		 * its actual appearance.
  1287 		 */
  1288 		if(!video)
  1289 			return gotall;	/* video not yet initialized */
  1290 		if(!video->physpal && !(which & SDL_LOGPAL) ) {
  1291 			/* Lazy physical palette allocation */
  1292 			int size;
  1293 			SDL_Palette *pp = malloc(sizeof(*pp));
  1294 			if ( !pp ) {
  1295 				return 0;
  1296 			}
  1297 			current_video->physpal = pp;
  1298 			pp->ncolors = pal->ncolors;
  1299 			size = pp->ncolors * sizeof(SDL_Color);
  1300 			pp->colors = malloc(size);
  1301 			if ( !pp->colors ) {
  1302 				return 0;
  1303 			}
  1304 			memcpy(pp->colors, pal->colors, size);
  1305 		}
  1306 		if ( ! SetPalette_physical(screen,
  1307 		                           colors, firstcolor, ncolors) ) {
  1308 			gotall = 0;
  1309 		}
  1310 	}
  1311 	return gotall;
  1312 }
  1313 
  1314 int SDL_SetColors(SDL_Surface *screen, SDL_Color *colors, int firstcolor,
  1315 		  int ncolors)
  1316 {
  1317 	return SDL_SetPalette(screen, SDL_LOGPAL | SDL_PHYSPAL,
  1318 			      colors, firstcolor, ncolors);
  1319 }
  1320 
  1321 /*
  1322  * Clean up the video subsystem
  1323  */
  1324 void SDL_VideoQuit (void)
  1325 {
  1326 	SDL_Surface *ready_to_go;
  1327 
  1328 	if ( current_video ) {
  1329 		SDL_VideoDevice *video = current_video;
  1330 		SDL_VideoDevice *this  = current_video;
  1331 
  1332 		/* Halt event processing before doing anything else */
  1333 		SDL_StopEventLoop();
  1334 
  1335 		/* Clean up allocated window manager items */
  1336 		if ( SDL_PublicSurface ) {
  1337 			SDL_PublicSurface = NULL;
  1338 		}
  1339 		SDL_CursorQuit();
  1340 
  1341 		/* Just in case... */
  1342 		SDL_WM_GrabInputOff();
  1343 
  1344 		/* Clean up the system video */
  1345 		video->VideoQuit(this);
  1346 
  1347 		/* Free any lingering surfaces */
  1348 		ready_to_go = SDL_ShadowSurface;
  1349 		SDL_ShadowSurface = NULL;
  1350 		SDL_FreeSurface(ready_to_go);
  1351 		if ( SDL_VideoSurface != NULL ) {
  1352 			ready_to_go = SDL_VideoSurface;
  1353 			SDL_VideoSurface = NULL;
  1354 			SDL_FreeSurface(ready_to_go);
  1355 		}
  1356 		SDL_PublicSurface = NULL;
  1357 
  1358 		/* Clean up miscellaneous memory */
  1359 		if ( video->physpal ) {
  1360 			free(video->physpal->colors);
  1361 			free(video->physpal);
  1362 			video->physpal = NULL;
  1363 		}
  1364 		if ( video->gammacols ) {
  1365 			free(video->gammacols);
  1366 			video->gammacols = NULL;
  1367 		}
  1368 		if ( video->gamma ) {
  1369 			free(video->gamma);
  1370 			video->gamma = NULL;
  1371 		}
  1372 		if ( video->wm_title != NULL ) {
  1373 			free(video->wm_title);
  1374 			video->wm_title = NULL;
  1375 		}
  1376 		if ( video->wm_icon != NULL ) {
  1377 			free(video->wm_icon);
  1378 			video->wm_icon = NULL;
  1379 		}
  1380 
  1381 		/* Finish cleaning up video subsystem */
  1382 		video->free(this);
  1383 		current_video = NULL;
  1384 	}
  1385 	return;
  1386 }
  1387 
  1388 /* Load the GL driver library */
  1389 int SDL_GL_LoadLibrary(const char *path)
  1390 {
  1391 	SDL_VideoDevice *video = current_video;
  1392 	SDL_VideoDevice *this = current_video;
  1393 	int retval;
  1394 
  1395 	retval = -1;
  1396 	if ( video == NULL ) {
  1397 		SDL_SetError("Video subsystem has not been initialized");
  1398 	} else {
  1399 		if ( video->GL_LoadLibrary ) {
  1400 			retval = video->GL_LoadLibrary(this, path);
  1401 		} else {
  1402 			SDL_SetError("No dynamic GL support in video driver");
  1403 		}
  1404 	}
  1405 	return(retval);
  1406 }
  1407 
  1408 void *SDL_GL_GetProcAddress(const char* proc)
  1409 {
  1410 	SDL_VideoDevice *video = current_video;
  1411 	SDL_VideoDevice *this = current_video;
  1412 	void *func;
  1413 
  1414 	func = NULL;
  1415 	if ( video->GL_GetProcAddress ) {
  1416 		if ( video->gl_config.driver_loaded ) {
  1417 			func = video->GL_GetProcAddress(this, proc);
  1418 		} else {
  1419 			SDL_SetError("No GL driver has been loaded");
  1420 		}
  1421 	} else {
  1422 		SDL_SetError("No dynamic GL support in video driver");
  1423 	}
  1424 	return func;
  1425 }
  1426 
  1427 /* Set the specified GL attribute for setting up a GL video mode */
  1428 int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
  1429 {
  1430 	int retval;
  1431 	SDL_VideoDevice *video = current_video;
  1432 
  1433 	retval = 0;
  1434 	switch (attr) {
  1435 		case SDL_GL_RED_SIZE:
  1436 			video->gl_config.red_size = value;
  1437 			break;
  1438 		case SDL_GL_GREEN_SIZE:
  1439 			video->gl_config.green_size = value;
  1440 			break;
  1441 		case SDL_GL_BLUE_SIZE:
  1442 			video->gl_config.blue_size = value;
  1443 			break;
  1444 		case SDL_GL_ALPHA_SIZE:
  1445 			video->gl_config.alpha_size = value;
  1446 			break;
  1447 		case SDL_GL_DOUBLEBUFFER:
  1448 			video->gl_config.double_buffer = value;
  1449 			break;
  1450 		case SDL_GL_BUFFER_SIZE:
  1451 			video->gl_config.buffer_size = value;
  1452 			break;
  1453 		case SDL_GL_DEPTH_SIZE:
  1454 			video->gl_config.depth_size = value;
  1455 			break;
  1456 		case SDL_GL_STENCIL_SIZE:
  1457 			video->gl_config.stencil_size = value;
  1458 			break;
  1459 		case SDL_GL_ACCUM_RED_SIZE:
  1460 			video->gl_config.accum_red_size = value;
  1461 			break;
  1462 		case SDL_GL_ACCUM_GREEN_SIZE:
  1463 			video->gl_config.accum_green_size = value;
  1464 			break;
  1465 		case SDL_GL_ACCUM_BLUE_SIZE:
  1466 			video->gl_config.accum_blue_size = value;
  1467 			break;
  1468 		case SDL_GL_ACCUM_ALPHA_SIZE:
  1469 			video->gl_config.accum_alpha_size = value;
  1470 			break;
  1471 		case SDL_GL_STEREO:
  1472 			video->gl_config.stereo = value;
  1473 			break;
  1474 		case SDL_GL_MULTISAMPLEBUFFERS:
  1475 			video->gl_config.multisamplebuffers = value;
  1476 			break;
  1477 		case SDL_GL_MULTISAMPLESAMPLES:
  1478 			video->gl_config.multisamplesamples = value;
  1479 			break;
  1480 		default:
  1481 			SDL_SetError("Unknown OpenGL attribute");
  1482 			retval = -1;
  1483 			break;
  1484 	}
  1485 	return(retval);
  1486 }
  1487 
  1488 /* Retrieve an attribute value from the windowing system. */
  1489 int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
  1490 {
  1491 	int retval = -1;
  1492 	SDL_VideoDevice* video = current_video;
  1493 	SDL_VideoDevice* this = current_video;
  1494 
  1495 	if ( video->GL_GetAttribute ) {
  1496 		retval = this->GL_GetAttribute(this, attr, value);
  1497 	} else {
  1498 		*value = 0;
  1499 		SDL_SetError("GL_GetAttribute not supported");
  1500 	}
  1501 	return retval;
  1502 }
  1503 
  1504 /* Perform a GL buffer swap on the current GL context */
  1505 void SDL_GL_SwapBuffers(void)
  1506 {
  1507 	SDL_VideoDevice *video = current_video;
  1508 	SDL_VideoDevice *this = current_video;
  1509 
  1510 	if ( video->screen->flags & SDL_OPENGL ) {
  1511 		video->GL_SwapBuffers(this);
  1512 	} else {
  1513 		SDL_SetError("OpenGL video mode has not been set");
  1514 	}
  1515 }
  1516 
  1517 /* Update rects with locking */
  1518 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect *rects)
  1519 {
  1520 	SDL_GL_Lock();
  1521  	SDL_GL_UpdateRects(numrects, rects);
  1522 	SDL_GL_Unlock();
  1523 }
  1524 
  1525 /* Update rects without state setting and changing (the caller is responsible for it) */
  1526 void SDL_GL_UpdateRects(int numrects, SDL_Rect *rects)
  1527 {
  1528 #ifdef HAVE_OPENGL
  1529 	SDL_VideoDevice *this = current_video;
  1530 	SDL_Rect update, tmp;
  1531 	int x, y, i;
  1532 
  1533 	for ( i = 0; i < numrects; i++ )
  1534 	{
  1535 		tmp.y = rects[i].y;
  1536 		tmp.h = rects[i].h;
  1537 		for ( y = 0; y <= rects[i].h / 256; y++ )
  1538 		{
  1539 			tmp.x = rects[i].x;
  1540 			tmp.w = rects[i].w;
  1541 			for ( x = 0; x <= rects[i].w / 256; x++ )
  1542 			{
  1543 				update.x = tmp.x;
  1544 				update.y = tmp.y;
  1545 				update.w = tmp.w;
  1546 				update.h = tmp.h;
  1547 
  1548 				if ( update.w > 256 )
  1549 					update.w = 256;
  1550 
  1551 				if ( update.h > 256 )
  1552 					update.h = 256;
  1553 			
  1554 				this->glFlush();
  1555 				this->glTexSubImage2D( 
  1556 					GL_TEXTURE_2D, 
  1557 					0, 
  1558 					0, 
  1559 					0, 
  1560 					update.w, 
  1561 					update.h, 
  1562 					this->is_32bit? GL_RGBA : GL_RGB,
  1563 #ifdef GL_VERSION_1_2
  1564 					this->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
  1565 #else
  1566 					GL_UNSIGNED_BYTE,
  1567 #endif
  1568 					(Uint8 *)this->screen->pixels + 
  1569 						this->screen->format->BytesPerPixel * update.x + 
  1570 						update.y * this->screen->pitch );
  1571 	
  1572 				this->glFlush();
  1573 				/*
  1574 				* Note the parens around the function name:
  1575 				* This is because some OpenGL implementations define glTexCoord etc 
  1576 				* as macros, and we don't want them expanded here.
  1577 				*/
  1578 				this->glBegin(GL_TRIANGLE_STRIP);
  1579 					(this->glTexCoord2f)( 0.0, 0.0 );	
  1580 					(this->glVertex2i)( update.x, update.y );
  1581 					(this->glTexCoord2f)( (float)(update.w / 256.0), 0.0 );	
  1582 					(this->glVertex2i)( update.x + update.w, update.y );
  1583 					(this->glTexCoord2f)( 0.0, (float)(update.h / 256.0) );
  1584 					(this->glVertex2i)( update.x, update.y + update.h );
  1585 					(this->glTexCoord2f)( (float)(update.w / 256.0), (float)(update.h / 256.0) );	
  1586 					(this->glVertex2i)( update.x + update.w	, update.y + update.h );
  1587 				this->glEnd();	
  1588 			
  1589 				tmp.x += 256;
  1590 				tmp.w -= 256;
  1591 			}
  1592 			tmp.y += 256;
  1593 			tmp.h -= 256;
  1594 		}
  1595 	}
  1596 #endif
  1597 }
  1598 
  1599 /* Lock == save current state */
  1600 void SDL_GL_Lock()
  1601 {
  1602 #ifdef HAVE_OPENGL
  1603 	lock_count--;
  1604 	if (lock_count==-1)
  1605 	{
  1606 		SDL_VideoDevice *this = current_video;
  1607 
  1608 		this->glPushAttrib( GL_ALL_ATTRIB_BITS );	/* TODO: narrow range of what is saved */
  1609 #ifdef GL_CLIENT_PIXEL_STORE_BIT
  1610 		this->glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
  1611 #endif
  1612 
  1613 		this->glEnable(GL_TEXTURE_2D);
  1614 		this->glEnable(GL_BLEND);
  1615 		this->glDisable(GL_FOG);
  1616 		this->glDisable(GL_ALPHA_TEST);
  1617 		this->glDisable(GL_DEPTH_TEST);
  1618 		this->glDisable(GL_SCISSOR_TEST);	
  1619 		this->glDisable(GL_STENCIL_TEST);
  1620 		this->glDisable(GL_CULL_FACE);
  1621 
  1622 		this->glBindTexture( GL_TEXTURE_2D, this->texture );
  1623 		this->glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
  1624 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  1625 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  1626 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  1627 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  1628 
  1629 		this->glPixelStorei( GL_UNPACK_ROW_LENGTH, this->screen->pitch / this->screen->format->BytesPerPixel );
  1630 		this->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  1631 		(this->glColor4f)(1.0, 1.0, 1.0, 1.0);		/* Solaris workaround */
  1632 
  1633 		this->glViewport(0, 0, this->screen->w, this->screen->h);
  1634 		this->glMatrixMode(GL_PROJECTION);
  1635 		this->glPushMatrix();
  1636 		this->glLoadIdentity();
  1637 
  1638 		this->glOrtho(0.0, (GLdouble) this->screen->w, (GLdouble) this->screen->h, 0.0, 0.0, 1.0);
  1639 
  1640 		this->glMatrixMode(GL_MODELVIEW);
  1641 		this->glPushMatrix();
  1642 		this->glLoadIdentity();
  1643 	}
  1644 #endif
  1645 }
  1646 
  1647 /* Unlock == restore saved state */
  1648 void SDL_GL_Unlock()
  1649 {
  1650 #ifdef HAVE_OPENGL
  1651 	lock_count++;
  1652 	if (lock_count==0)
  1653 	{
  1654 		SDL_VideoDevice *this = current_video;
  1655 
  1656 		this->glPopMatrix();
  1657 		this->glMatrixMode(GL_PROJECTION);
  1658 		this->glPopMatrix();
  1659 
  1660 		this->glPopClientAttrib();
  1661 		this->glPopAttrib();
  1662 	}
  1663 #endif
  1664 }
  1665 
  1666 /*
  1667  * Sets/Gets the title and icon text of the display window, if any.
  1668  */
  1669 void SDL_WM_SetCaption (const char *title, const char *icon)
  1670 {
  1671 	SDL_VideoDevice *video = current_video;
  1672 	SDL_VideoDevice *this  = current_video;
  1673 
  1674 	if ( video ) {
  1675 		if ( title ) {
  1676 			if ( video->wm_title ) {
  1677 				free(video->wm_title);
  1678 			}
  1679 			video->wm_title = (char *)malloc(strlen(title)+1);
  1680 			if ( video->wm_title != NULL ) {
  1681 				strcpy(video->wm_title, title);
  1682 			}
  1683 		}
  1684 		if ( icon ) {
  1685 			if ( video->wm_icon ) {
  1686 				free(video->wm_icon);
  1687 			}
  1688 			video->wm_icon = (char *)malloc(strlen(icon)+1);
  1689 			if ( video->wm_icon != NULL ) {
  1690 				strcpy(video->wm_icon, icon);
  1691 			}
  1692 		}
  1693 		if ( (title || icon) && (video->SetCaption != NULL) ) {
  1694 			video->SetCaption(this, video->wm_title,video->wm_icon);
  1695 		}
  1696 	}
  1697 }
  1698 void SDL_WM_GetCaption (char **title, char **icon)
  1699 {
  1700 	SDL_VideoDevice *video = current_video;
  1701 
  1702 	if ( video ) {
  1703 		if ( title ) {
  1704 			*title = video->wm_title;
  1705 		}
  1706 		if ( icon ) {
  1707 			*icon = video->wm_icon;
  1708 		}
  1709 	}
  1710 }
  1711 
  1712 /* Utility function used by SDL_WM_SetIcon();
  1713  * flags & 1 for color key, flags & 2 for alpha channel. */
  1714 static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
  1715 {
  1716 	int x, y;
  1717 	Uint32 colorkey;
  1718 #define SET_MASKBIT(icon, x, y, mask) \
  1719 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  1720 
  1721 	colorkey = icon->format->colorkey;
  1722 	switch (icon->format->BytesPerPixel) {
  1723 		case 1: { Uint8 *pixels;
  1724 			for ( y=0; y<icon->h; ++y ) {
  1725 				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
  1726 				for ( x=0; x<icon->w; ++x ) {
  1727 					if ( *pixels++ == colorkey ) {
  1728 						SET_MASKBIT(icon, x, y, mask);
  1729 					}
  1730 				}
  1731 			}
  1732 		}
  1733 		break;
  1734 
  1735 		case 2: { Uint16 *pixels;
  1736 			for ( y=0; y<icon->h; ++y ) {
  1737 				pixels = (Uint16 *)icon->pixels +
  1738 				                   y*icon->pitch/2;
  1739 				for ( x=0; x<icon->w; ++x ) {
  1740 					if ( (flags & 1) && *pixels == colorkey ) {
  1741 						SET_MASKBIT(icon, x, y, mask);
  1742 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1743 						SET_MASKBIT(icon, x, y, mask);
  1744 					}
  1745 					pixels++;
  1746 				}
  1747 			}
  1748 		}
  1749 		break;
  1750 
  1751 		case 4: { Uint32 *pixels;
  1752 			for ( y=0; y<icon->h; ++y ) {
  1753 				pixels = (Uint32 *)icon->pixels +
  1754 				                   y*icon->pitch/4;
  1755 				for ( x=0; x<icon->w; ++x ) {
  1756 					if ( (flags & 1) && *pixels == colorkey ) {
  1757 						SET_MASKBIT(icon, x, y, mask);
  1758 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1759 						SET_MASKBIT(icon, x, y, mask);
  1760 					}
  1761 					pixels++;
  1762 				}
  1763 			}
  1764 		}
  1765 		break;
  1766 	}
  1767 }
  1768 
  1769 /*
  1770  * Sets the window manager icon for the display window.
  1771  */
  1772 void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
  1773 {
  1774 	SDL_VideoDevice *video = current_video;
  1775 	SDL_VideoDevice *this  = current_video;
  1776 
  1777 	if ( icon && video->SetIcon ) {
  1778 		/* Generate a mask if necessary, and create the icon! */
  1779 		if ( mask == NULL ) {
  1780 			int mask_len = icon->h*(icon->w+7)/8;
  1781 			int flags = 0;
  1782 			mask = (Uint8 *)malloc(mask_len);
  1783 			if ( mask == NULL ) {
  1784 				return;
  1785 			}
  1786 			memset(mask, ~0, mask_len);
  1787 			if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
  1788 			if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
  1789 			if( flags ) {
  1790 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  1791 			}
  1792 			video->SetIcon(video, icon, mask);
  1793 			free(mask);
  1794 		} else {
  1795 			video->SetIcon(this, icon, mask);
  1796 		}
  1797 	}
  1798 }
  1799 
  1800 /*
  1801  * Grab or ungrab the keyboard and mouse input.
  1802  * This function returns the final grab mode after calling the
  1803  * driver dependent function.
  1804  */
  1805 static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
  1806 {
  1807 	SDL_VideoDevice *video = current_video;
  1808 	SDL_VideoDevice *this  = current_video;
  1809 
  1810 	/* Only do something if we have support for grabs */
  1811 	if ( video->GrabInput == NULL ) {
  1812 		return(video->input_grab);
  1813 	}
  1814 
  1815 	/* If the final grab mode if off, only then do we actually grab */
  1816 #ifdef DEBUG_GRAB
  1817   printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
  1818 #endif
  1819 	if ( mode == SDL_GRAB_OFF ) {
  1820 		if ( video->input_grab != SDL_GRAB_OFF ) {
  1821 			mode = video->GrabInput(this, mode);
  1822 		}
  1823 	} else {
  1824 		if ( video->input_grab == SDL_GRAB_OFF ) {
  1825 			mode = video->GrabInput(this, mode);
  1826 		}
  1827 	}
  1828 	if ( mode != video->input_grab ) {
  1829 		video->input_grab = mode;
  1830 		if ( video->CheckMouseMode ) {
  1831 			video->CheckMouseMode(this);
  1832 		}
  1833 	}
  1834 #ifdef DEBUG_GRAB
  1835   printf("Final mode %d\n", video->input_grab);
  1836 #endif
  1837 
  1838 	/* Return the final grab state */
  1839 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1840 		mode -= SDL_GRAB_FULLSCREEN;
  1841 	}
  1842 	return(mode);
  1843 }
  1844 SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
  1845 {
  1846 	SDL_VideoDevice *video = current_video;
  1847 
  1848 	/* If the video isn't initialized yet, we can't do anything */
  1849 	if ( ! video ) {
  1850 		return SDL_GRAB_OFF;
  1851 	}
  1852 
  1853 	/* Return the current mode on query */
  1854 	if ( mode == SDL_GRAB_QUERY ) {
  1855 		mode = video->input_grab;
  1856 		if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1857 			mode -= SDL_GRAB_FULLSCREEN;
  1858 		}
  1859 		return(mode);
  1860 	}
  1861 
  1862 #ifdef DEBUG_GRAB
  1863   printf("SDL_WM_GrabInput(%d) ... ", mode);
  1864 #endif
  1865 	/* If the video surface is fullscreen, we always grab */
  1866 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1867 		mode -= SDL_GRAB_FULLSCREEN;
  1868 	}
  1869 	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
  1870 		mode += SDL_GRAB_FULLSCREEN;
  1871 	}
  1872 	return(SDL_WM_GrabInputRaw(mode));
  1873 }
  1874 static SDL_GrabMode SDL_WM_GrabInputOff(void)
  1875 {
  1876 	SDL_GrabMode mode;
  1877 
  1878 	/* First query the current grab state */
  1879 	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
  1880 
  1881 	/* Now explicitly turn off input grab */
  1882 	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);
  1883 
  1884 	/* Return the old state */
  1885 	return(mode);
  1886 }
  1887 
  1888 /*
  1889  * Iconify the window in window managed environments.
  1890  * A successful iconification will result in an SDL_APPACTIVE loss event.
  1891  */
  1892 int SDL_WM_IconifyWindow(void)
  1893 {
  1894 	SDL_VideoDevice *video = current_video;
  1895 	SDL_VideoDevice *this  = current_video;
  1896 	int retval;
  1897 
  1898 	retval = 0;
  1899 	if ( video->IconifyWindow ) {
  1900 		retval = video->IconifyWindow(this);
  1901 	}
  1902 	return(retval);
  1903 }
  1904 
  1905 /*
  1906  * Toggle fullscreen mode
  1907  */
  1908 int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
  1909 {
  1910 	SDL_VideoDevice *video = current_video;
  1911 	SDL_VideoDevice *this  = current_video;
  1912 	int toggled;
  1913 
  1914 	toggled = 0;
  1915 	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
  1916 	     video->ToggleFullScreen ) {
  1917 		if ( surface->flags & SDL_FULLSCREEN ) {
  1918 			toggled = video->ToggleFullScreen(this, 0);
  1919 			if ( toggled ) {
  1920 				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
  1921 				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
  1922 			}
  1923 		} else {
  1924 			toggled = video->ToggleFullScreen(this, 1);
  1925 			if ( toggled ) {
  1926 				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
  1927 				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
  1928 			}
  1929 		}
  1930 		/* Double-check the grab state inside SDL_WM_GrabInput() */
  1931 		if ( toggled ) {
  1932 			SDL_WM_GrabInput(video->input_grab);
  1933 		}
  1934 	}
  1935 	return(toggled);
  1936 }
  1937 
  1938 /*
  1939  * Get some platform dependent window manager information
  1940  */
  1941 int SDL_GetWMInfo (SDL_SysWMinfo *info)
  1942 {
  1943 	SDL_VideoDevice *video = current_video;
  1944 	SDL_VideoDevice *this  = current_video;
  1945 
  1946 	if ( video && video->GetWMInfo ) {
  1947 		return(video->GetWMInfo(this, info));
  1948 	} else {
  1949 		return(0);
  1950 	}
  1951 }