src/video/SDL_video.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 23 Nov 2005 07:29:56 +0000
changeset 1190 173c063d4f55
parent 1187 19d8949b4584
child 1210 8609567ea02f
permissions -rw-r--r--
OS/2 port!

This was mostly, if not entirely, written by "Doodle" and "Caetano":
doodle@scenergy.dfmk.hu
daniel@caetano.eng.br

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