src/video/SDL_video.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 03 Jul 2007 09:39:09 +0000
branchSDL-1.2
changeset 3995 604321d3575e
parent 3976 8582c6a5ca16
child 4140 fc69b552ee32
permissions -rw-r--r--
Fixed bug #398

You can use SetColors() before the video mode has been set.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2006 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* The high-level video driver subsystem */
    25 
    26 #include "SDL.h"
    27 #include "SDL_sysvideo.h"
    28 #include "SDL_blit.h"
    29 #include "SDL_pixels_c.h"
    30 #include "SDL_cursor_c.h"
    31 #include "../events/SDL_sysevents.h"
    32 #include "../events/SDL_events_c.h"
    33 
    34 /* Available video drivers */
    35 static VideoBootStrap *bootstrap[] = {
    36 #if SDL_VIDEO_DRIVER_QUARTZ
    37 	&QZ_bootstrap,
    38 #endif
    39 #if SDL_VIDEO_DRIVER_X11
    40 	&X11_bootstrap,
    41 #endif
    42 #if SDL_VIDEO_DRIVER_DGA
    43 	&DGA_bootstrap,
    44 #endif
    45 #if SDL_VIDEO_DRIVER_NANOX
    46 	&NX_bootstrap,
    47 #endif
    48 #if SDL_VIDEO_DRIVER_IPOD
    49 	&iPod_bootstrap,
    50 #endif
    51 #if SDL_VIDEO_DRIVER_QTOPIA
    52 	&Qtopia_bootstrap,
    53 #endif
    54 #if SDL_VIDEO_DRIVER_WSCONS
    55 	&WSCONS_bootstrap,
    56 #endif
    57 #if SDL_VIDEO_DRIVER_FBCON
    58 	&FBCON_bootstrap,
    59 #endif
    60 #if SDL_VIDEO_DRIVER_DIRECTFB
    61 	&DirectFB_bootstrap,
    62 #endif
    63 #if SDL_VIDEO_DRIVER_PS2GS
    64 	&PS2GS_bootstrap,
    65 #endif
    66 #if SDL_VIDEO_DRIVER_GGI
    67 	&GGI_bootstrap,
    68 #endif
    69 #if SDL_VIDEO_DRIVER_VGL
    70 	&VGL_bootstrap,
    71 #endif
    72 #if SDL_VIDEO_DRIVER_SVGALIB
    73 	&SVGALIB_bootstrap,
    74 #endif
    75 #if SDL_VIDEO_DRIVER_GAPI
    76 	&GAPI_bootstrap,
    77 #endif
    78 #if SDL_VIDEO_DRIVER_WINDIB
    79 	&WINDIB_bootstrap,
    80 #endif
    81 #if SDL_VIDEO_DRIVER_DDRAW
    82 	&DIRECTX_bootstrap,
    83 #endif
    84 #if SDL_VIDEO_DRIVER_BWINDOW
    85 	&BWINDOW_bootstrap,
    86 #endif
    87 #if SDL_VIDEO_DRIVER_TOOLBOX
    88 	&TOOLBOX_bootstrap,
    89 #endif
    90 #if SDL_VIDEO_DRIVER_DRAWSPROCKET
    91 	&DSp_bootstrap,
    92 #endif
    93 #if SDL_VIDEO_DRIVER_PHOTON
    94 	&ph_bootstrap,
    95 #endif
    96 #if SDL_VIDEO_DRIVER_EPOC
    97 	&EPOC_bootstrap,
    98 #endif
    99 #if SDL_VIDEO_DRIVER_XBIOS
   100 	&XBIOS_bootstrap,
   101 #endif
   102 #if SDL_VIDEO_DRIVER_GEM
   103 	&GEM_bootstrap,
   104 #endif
   105 #if SDL_VIDEO_DRIVER_PICOGUI
   106 	&PG_bootstrap,
   107 #endif
   108 #if SDL_VIDEO_DRIVER_DC
   109 	&DC_bootstrap,
   110 #endif
   111 #if SDL_VIDEO_DRIVER_NDS
   112 	&NDS_bootstrap,
   113 #endif
   114 #if SDL_VIDEO_DRIVER_RISCOS
   115 	&RISCOS_bootstrap,
   116 #endif
   117 #if SDL_VIDEO_DRIVER_OS2FS
   118 	&OS2FSLib_bootstrap,
   119 #endif
   120 #if SDL_VIDEO_DRIVER_AALIB
   121 	&AALIB_bootstrap,
   122 #endif
   123 #if SDL_VIDEO_DRIVER_DUMMY
   124 	&DUMMY_bootstrap,
   125 #endif
   126 	NULL
   127 };
   128 
   129 SDL_VideoDevice *current_video = NULL;
   130 
   131 /* Various local functions */
   132 int SDL_VideoInit(const char *driver_name, Uint32 flags);
   133 void SDL_VideoQuit(void);
   134 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect* rects);
   135 
   136 static SDL_GrabMode SDL_WM_GrabInputOff(void);
   137 #if SDL_VIDEO_OPENGL
   138 static int lock_count = 0;
   139 #endif
   140 
   141 
   142 /*
   143  * Initialize the video and event subsystems -- determine native pixel format
   144  */
   145 int SDL_VideoInit (const char *driver_name, Uint32 flags)
   146 {
   147 	SDL_VideoDevice *video;
   148 	int index;
   149 	int i;
   150 	SDL_PixelFormat vformat;
   151 	Uint32 video_flags;
   152 
   153 	/* Toggle the event thread flags, based on OS requirements */
   154 #if defined(MUST_THREAD_EVENTS)
   155 	flags |= SDL_INIT_EVENTTHREAD;
   156 #elif defined(CANT_THREAD_EVENTS)
   157 	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {
   158 		SDL_SetError("OS doesn't support threaded events");
   159 		return(-1);
   160 	}
   161 #endif
   162 
   163 	/* Check to make sure we don't overwrite 'current_video' */
   164 	if ( current_video != NULL ) {
   165 		SDL_VideoQuit();
   166 	}
   167 
   168 	/* Select the proper video driver */
   169 	index = 0;
   170 	video = NULL;
   171 	if ( driver_name != NULL ) {
   172 #if 0	/* This will be replaced with a better driver selection API */
   173 		if ( SDL_strrchr(driver_name, ':') != NULL ) {
   174 			index = atoi(SDL_strrchr(driver_name, ':')+1);
   175 		}
   176 #endif
   177 		for ( i=0; bootstrap[i]; ++i ) {
   178 			if ( SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
   179 				if ( bootstrap[i]->available() ) {
   180 					video = bootstrap[i]->create(index);
   181 					break;
   182 				}
   183 			}
   184 		}
   185 	} else {
   186 		for ( i=0; bootstrap[i]; ++i ) {
   187 			if ( bootstrap[i]->available() ) {
   188 				video = bootstrap[i]->create(index);
   189 				if ( video != NULL ) {
   190 					break;
   191 				}
   192 			}
   193 		}
   194 	}
   195 	if ( video == NULL ) {
   196 		SDL_SetError("No available video device");
   197 		return(-1);
   198 	}
   199 	current_video = video;
   200 	current_video->name = bootstrap[i]->name;
   201 
   202 	/* Do some basic variable initialization */
   203 	video->screen = NULL;
   204 	video->shadow = NULL;
   205 	video->visible = NULL;
   206 	video->physpal = NULL;
   207 	video->gammacols = NULL;
   208 	video->gamma = NULL;
   209 	video->wm_title = NULL;
   210 	video->wm_icon  = NULL;
   211 	video->offset_x = 0;
   212 	video->offset_y = 0;
   213 	SDL_memset(&video->info, 0, (sizeof video->info));
   214 	
   215 	video->displayformatalphapixel = NULL;
   216 
   217 	/* Set some very sane GL defaults */
   218 	video->gl_config.driver_loaded = 0;
   219 	video->gl_config.dll_handle = NULL;
   220 	video->gl_config.red_size = 3;
   221 	video->gl_config.green_size = 3;
   222 	video->gl_config.blue_size = 2;
   223 	video->gl_config.alpha_size = 0;
   224 	video->gl_config.buffer_size = 0;
   225 	video->gl_config.depth_size = 16;
   226 	video->gl_config.stencil_size = 0;
   227 	video->gl_config.double_buffer = 1;
   228 	video->gl_config.accum_red_size = 0;
   229 	video->gl_config.accum_green_size = 0;
   230 	video->gl_config.accum_blue_size = 0;
   231 	video->gl_config.accum_alpha_size = 0;
   232 	video->gl_config.stereo = 0;
   233 	video->gl_config.multisamplebuffers = 0;
   234 	video->gl_config.multisamplesamples = 0;
   235 	video->gl_config.accelerated = -1; /* not known, don't set */
   236 	video->gl_config.swap_control = -1; /* not known, don't set */
   237 	
   238 	/* Initialize the video subsystem */
   239 	SDL_memset(&vformat, 0, sizeof(vformat));
   240 	if ( video->VideoInit(video, &vformat) < 0 ) {
   241 		SDL_VideoQuit();
   242 		return(-1);
   243 	}
   244 
   245 	/* Create a zero sized video surface of the appropriate format */
   246 	video_flags = SDL_SWSURFACE;
   247 	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,
   248 				vformat.BitsPerPixel,
   249 				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);
   250 	if ( SDL_VideoSurface == NULL ) {
   251 		SDL_VideoQuit();
   252 		return(-1);
   253 	}
   254 	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */
   255 
   256 #if 0 /* Don't change the current palette - may be used by other programs.
   257        * The application can't do anything with the display surface until
   258        * a video mode has been set anyway. :)
   259        */
   260 	/* If we have a palettized surface, create a default palette */
   261 	if ( SDL_VideoSurface->format->palette ) {
   262 		SDL_PixelFormat *vf = SDL_VideoSurface->format;
   263 		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   264 		video->SetColors(video,
   265 				 0, vf->palette->ncolors, vf->palette->colors);
   266 	}
   267 #endif
   268 	video->info.vfmt = SDL_VideoSurface->format;
   269 
   270 	/* Start the event loop */
   271 	if ( SDL_StartEventLoop(flags) < 0 ) {
   272 		SDL_VideoQuit();
   273 		return(-1);
   274 	}
   275 	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);
   276 
   277 	/* We're ready to go! */
   278 	return(0);
   279 }
   280 
   281 char *SDL_VideoDriverName(char *namebuf, int maxlen)
   282 {
   283 	if ( current_video != NULL ) {
   284 		SDL_strlcpy(namebuf, current_video->name, maxlen);
   285 		return(namebuf);
   286 	}
   287 	return(NULL);
   288 }
   289 
   290 /*
   291  * Get the current display surface
   292  */
   293 SDL_Surface *SDL_GetVideoSurface(void)
   294 {
   295 	SDL_Surface *visible;
   296 
   297 	visible = NULL;
   298 	if ( current_video ) {
   299 		visible = current_video->visible;
   300 	}
   301 	return(visible);
   302 }
   303 
   304 /*
   305  * Get the current information about the video hardware
   306  */
   307 const SDL_VideoInfo *SDL_GetVideoInfo(void)
   308 {
   309 	const SDL_VideoInfo *info;
   310 
   311 	info = NULL;
   312 	if ( current_video ) {
   313 		info = &current_video->info;
   314 	}
   315 	return(info);
   316 }
   317 
   318 /*
   319  * Return a pointer to an array of available screen dimensions for the
   320  * given format, sorted largest to smallest.  Returns NULL if there are
   321  * no dimensions available for a particular format, or (SDL_Rect **)-1
   322  * if any dimension is okay for the given format.  If 'format' is NULL,
   323  * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt
   324  */
   325 SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)
   326 {
   327 	SDL_VideoDevice *video = current_video;
   328 	SDL_VideoDevice *this  = current_video;
   329 	SDL_Rect **modes;
   330 
   331 	modes = NULL;
   332 	if ( SDL_VideoSurface ) {
   333 		if ( format == NULL ) {
   334 			format = SDL_VideoSurface->format;
   335 		}
   336 		modes = video->ListModes(this, format, flags);
   337 	}
   338 	return(modes);
   339 }
   340 
   341 /*
   342  * Check to see if a particular video mode is supported.
   343  * It returns 0 if the requested mode is not supported under any bit depth,
   344  * or returns the bits-per-pixel of the closest available mode with the
   345  * given width and height.  If this bits-per-pixel is different from the
   346  * one used when setting the video mode, SDL_SetVideoMode() will succeed,
   347  * but will emulate the requested bits-per-pixel with a shadow surface.
   348  */
   349 static Uint8 SDL_closest_depths[4][8] = {
   350 	/* 8 bit closest depth ordering */
   351 	{ 0, 8, 16, 15, 32, 24, 0, 0 },
   352 	/* 15,16 bit closest depth ordering */
   353 	{ 0, 16, 15, 32, 24, 8, 0, 0 },
   354 	/* 24 bit closest depth ordering */
   355 	{ 0, 24, 32, 16, 15, 8, 0, 0 },
   356 	/* 32 bit closest depth ordering */
   357 	{ 0, 32, 16, 15, 24, 8, 0, 0 }
   358 };
   359 
   360 
   361 #ifdef __MACOS__ /* MPW optimization bug? */
   362 #define NEGATIVE_ONE 0xFFFFFFFF
   363 #else
   364 #define NEGATIVE_ONE -1
   365 #endif
   366 
   367 int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
   368 {
   369 	int table, b, i;
   370 	int supported;
   371 	SDL_PixelFormat format;
   372 	SDL_Rect **sizes;
   373 
   374 	/* Currently 1 and 4 bpp are not supported */
   375 	if ( bpp < 8 || bpp > 32 ) {
   376 		return(0);
   377 	}
   378 	if ( (width <= 0) || (height <= 0) ) {
   379 		return(0);
   380 	}
   381 
   382 	/* Search through the list valid of modes */
   383 	SDL_memset(&format, 0, sizeof(format));
   384 	supported = 0;
   385 	table = ((bpp+7)/8)-1;
   386 	SDL_closest_depths[table][0] = bpp;
   387 	SDL_closest_depths[table][7] = 0;
   388 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   389 		format.BitsPerPixel = SDL_closest_depths[table][b];
   390 		sizes = SDL_ListModes(&format, flags);
   391 		if ( sizes == (SDL_Rect **)0 ) {
   392 			/* No sizes supported at this bit-depth */
   393 			continue;
   394 		} else 
   395 		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
   396 			/* Any size supported at this bit-depth */
   397 			supported = 1;
   398 			continue;
   399 		} else if (current_video->handles_any_size) {
   400 			/* Driver can center a smaller surface to simulate fullscreen */
   401 			for ( i=0; sizes[i]; ++i ) {
   402 				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {
   403 					supported = 1; /* this mode can fit the centered window. */
   404 					break;
   405 				}
   406 			}
   407 		} else
   408 		for ( i=0; sizes[i]; ++i ) {
   409 			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {
   410 				supported = 1;
   411 				break;
   412 			}
   413 		}
   414 	}
   415 	if ( supported ) {
   416 		--b;
   417 		return(SDL_closest_depths[table][b]);
   418 	} else {
   419 		return(0);
   420 	}
   421 }
   422 
   423 /*
   424  * Get the closest non-emulated video mode to the one requested
   425  */
   426 static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)
   427 {
   428 	int table, b, i;
   429 	int supported;
   430 	int native_bpp;
   431 	SDL_PixelFormat format;
   432 	SDL_Rect **sizes;
   433 
   434 	/* Check parameters */
   435 	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
   436 		SDL_SetError("Invalid bits per pixel (range is {8...32})");
   437 		return(0);
   438 	}
   439 	if ((*w <= 0) || (*h <= 0)) {
   440 		SDL_SetError("Invalid width or height");
   441 		return(0);
   442 	}
   443 
   444 	/* Try the original video mode, get the closest depth */
   445 	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);
   446 	if ( native_bpp == *BitsPerPixel ) {
   447 		return(1);
   448 	}
   449 	if ( native_bpp > 0 ) {
   450 		*BitsPerPixel = native_bpp;
   451 		return(1);
   452 	}
   453 
   454 	/* No exact size match at any depth, look for closest match */
   455 	SDL_memset(&format, 0, sizeof(format));
   456 	supported = 0;
   457 	table = ((*BitsPerPixel+7)/8)-1;
   458 	SDL_closest_depths[table][0] = *BitsPerPixel;
   459 	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;
   460 	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {
   461 		int best;
   462 
   463 		format.BitsPerPixel = SDL_closest_depths[table][b];
   464 		sizes = SDL_ListModes(&format, flags);
   465 		if ( sizes == (SDL_Rect **)0 ) {
   466 			/* No sizes supported at this bit-depth */
   467 			continue;
   468 		}
   469 		best=0;
   470 		for ( i=0; sizes[i]; ++i ) {
   471 			/* Mode with both dimensions bigger or equal than asked ? */
   472 			if ((sizes[i]->w >= *w) && (sizes[i]->h >= *h)) {
   473 				/* Mode with any dimension smaller or equal than current best ? */
   474 				if ((sizes[i]->w <= sizes[best]->w) || (sizes[i]->h <= sizes[best]->h)) {
   475 					/* Now choose the mode that has less pixels */
   476 					if ((sizes[i]->w * sizes[i]->h) <= (sizes[best]->w * sizes[best]->h)) {
   477 						best=i;
   478 						supported = 1;
   479 					}
   480 				}
   481 			}
   482 		}
   483 		if (supported) {
   484 			*w=sizes[best]->w;
   485 			*h=sizes[best]->h;
   486 			*BitsPerPixel = SDL_closest_depths[table][b];
   487 		}
   488 	}
   489 	if ( ! supported ) {
   490 		SDL_SetError("No video mode large enough for %dx%d", *w, *h);
   491 	}
   492 	return(supported);
   493 }
   494 
   495 /* This should probably go somewhere else -- like SDL_surface.c */
   496 static void SDL_ClearSurface(SDL_Surface *surface)
   497 {
   498 	Uint32 black;
   499 
   500 	black = SDL_MapRGB(surface->format, 0, 0, 0);
   501 	SDL_FillRect(surface, NULL, black);
   502 	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {
   503 		SDL_Flip(surface);
   504 		SDL_FillRect(surface, NULL, black);
   505 	}
   506 	SDL_Flip(surface);
   507 }
   508 
   509 /*
   510  * Create a shadow surface suitable for fooling the app. :-)
   511  */
   512 static void SDL_CreateShadowSurface(int depth)
   513 {
   514 	Uint32 Rmask, Gmask, Bmask;
   515 
   516 	/* Allocate the shadow surface */
   517 	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   518 		Rmask = (SDL_VideoSurface->format)->Rmask;
   519 		Gmask = (SDL_VideoSurface->format)->Gmask;
   520 		Bmask = (SDL_VideoSurface->format)->Bmask;
   521 	} else {
   522 		Rmask = Gmask = Bmask = 0;
   523 	}
   524 	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,
   525 				SDL_VideoSurface->w, SDL_VideoSurface->h,
   526 						depth, Rmask, Gmask, Bmask, 0);
   527 	if ( SDL_ShadowSurface == NULL ) {
   528 		return;
   529 	}
   530 
   531 	/* 8-bit shadow surfaces report that they have exclusive palette */
   532 	if ( SDL_ShadowSurface->format->palette ) {
   533 		SDL_ShadowSurface->flags |= SDL_HWPALETTE;
   534 		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {
   535 			SDL_memcpy(SDL_ShadowSurface->format->palette->colors,
   536 				SDL_VideoSurface->format->palette->colors,
   537 				SDL_VideoSurface->format->palette->ncolors*
   538 							sizeof(SDL_Color));
   539 		} else {
   540 			SDL_DitherColors(
   541 			SDL_ShadowSurface->format->palette->colors, depth);
   542 		}
   543 	}
   544 
   545 	/* If the video surface is resizable, the shadow should say so */
   546 	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {
   547 		SDL_ShadowSurface->flags |= SDL_RESIZABLE;
   548 	}
   549 	/* If the video surface has no frame, the shadow should say so */
   550 	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {
   551 		SDL_ShadowSurface->flags |= SDL_NOFRAME;
   552 	}
   553 	/* If the video surface is fullscreen, the shadow should say so */
   554 	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
   555 		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;
   556 	}
   557 	/* If the video surface is flippable, the shadow should say so */
   558 	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   559 		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;
   560 	}
   561 	return;
   562 }
   563 
   564 #ifdef __QNXNTO__
   565     #include <sys/neutrino.h>
   566 #endif /* __QNXNTO__ */
   567 
   568 /*
   569  * Set the requested video mode, allocating a shadow buffer if necessary.
   570  */
   571 SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)
   572 {
   573 	SDL_VideoDevice *video, *this;
   574 	SDL_Surface *prev_mode, *mode;
   575 	int video_w;
   576 	int video_h;
   577 	int video_bpp;
   578 	int is_opengl;
   579 	SDL_GrabMode saved_grab;
   580 
   581 	/* Start up the video driver, if necessary..
   582 	   WARNING: This is the only function protected this way!
   583 	 */
   584 	if ( ! current_video ) {
   585 		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {
   586 			return(NULL);
   587 		}
   588 	}
   589 	this = video = current_video;
   590 
   591 	/* Default to the current width and height */
   592 	if ( width == 0 ) {
   593 		width = video->info.current_w;
   594 	}
   595 	if ( height == 0 ) {
   596 		height = video->info.current_h;
   597 	}
   598 	/* Default to the current video bpp */
   599 	if ( bpp == 0 ) {
   600 		flags |= SDL_ANYFORMAT;
   601 		bpp = SDL_VideoSurface->format->BitsPerPixel;
   602 	}
   603 
   604 	/* Get a good video mode, the closest one possible */
   605 	video_w = width;
   606 	video_h = height;
   607 	video_bpp = bpp;
   608 	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {
   609 		return(NULL);
   610 	}
   611 
   612 	/* Check the requested flags */
   613 	/* There's no palette in > 8 bits-per-pixel mode */
   614 	if ( video_bpp > 8 ) {
   615 		flags &= ~SDL_HWPALETTE;
   616 	}
   617 #if 0
   618 	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {
   619 		/* There's no windowed double-buffering */
   620 		flags &= ~SDL_DOUBLEBUF;
   621 	}
   622 #endif
   623 	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
   624 		/* Use hardware surfaces when double-buffering */
   625 		flags |= SDL_HWSURFACE;
   626 	}
   627 
   628 	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );
   629 	if ( is_opengl ) {
   630 		/* These flags are for 2D video modes only */
   631 		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);
   632 	}
   633 
   634 	/* Reset the keyboard here so event callbacks can run */
   635 	SDL_ResetKeyboard();
   636 	SDL_ResetMouse();
   637 	SDL_cursorstate &= ~CURSOR_USINGSW;
   638 
   639 	/* Clean up any previous video mode */
   640 	if ( SDL_PublicSurface != NULL ) {
   641 		SDL_PublicSurface = NULL;
   642 	}
   643 	if ( SDL_ShadowSurface != NULL ) {
   644 		SDL_Surface *ready_to_go;
   645 		ready_to_go = SDL_ShadowSurface;
   646 		SDL_ShadowSurface = NULL;
   647 		SDL_FreeSurface(ready_to_go);
   648 	}
   649 	if ( video->physpal ) {
   650 		SDL_free(video->physpal->colors);
   651 		SDL_free(video->physpal);
   652 		video->physpal = NULL;
   653 	}
   654 	if( video->gammacols) {
   655 		SDL_free(video->gammacols);
   656 		video->gammacols = NULL;
   657 	}
   658 
   659 	/* Save the previous grab state and turn off grab for mode switch */
   660 	saved_grab = SDL_WM_GrabInputOff();
   661 
   662 	/* Try to set the video mode, along with offset and clipping */
   663 	prev_mode = SDL_VideoSurface;
   664 	SDL_LockCursor();
   665 	SDL_VideoSurface = NULL;	/* In case it's freed by driver */
   666 	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);
   667 	if ( mode ) { /* Prevent resize events from mode change */
   668           /* But not on OS/2 */
   669 #ifndef __OS2__
   670 	    SDL_PrivateResize(mode->w, mode->h);
   671 #endif
   672 
   673 	    /* Sam - If we asked for OpenGL mode, and didn't get it, fail */
   674 	    if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {
   675 		mode = NULL;
   676 		SDL_SetError("OpenGL not available");
   677 	    }
   678 	}
   679 	/*
   680 	 * rcg11292000
   681 	 * If you try to set an SDL_OPENGL surface, and fail to find a
   682 	 * matching  visual, then the next call to SDL_SetVideoMode()
   683 	 * will segfault, since  we no longer point to a dummy surface,
   684 	 * but rather NULL.
   685 	 * Sam 11/29/00
   686 	 * WARNING, we need to make sure that the previous mode hasn't
   687 	 * already been freed by the video driver.  What do we do in
   688 	 * that case?  Should we call SDL_VideoInit() again?
   689 	 */
   690 	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;
   691 
   692 	if ( (mode != NULL) && (!is_opengl) ) {
   693 		/* Sanity check */
   694 		if ( (mode->w < width) || (mode->h < height) ) {
   695 			SDL_SetError("Video mode smaller than requested");
   696 			return(NULL);
   697 		}
   698 
   699 		/* If we have a palettized surface, create a default palette */
   700 		if ( mode->format->palette ) {
   701 			SDL_PixelFormat *vf = mode->format;
   702 			SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);
   703 			video->SetColors(this, 0, vf->palette->ncolors,
   704 			                           vf->palette->colors);
   705 		}
   706 
   707 		/* Clear the surface to black */
   708 		video->offset_x = 0;
   709 		video->offset_y = 0;
   710 		mode->offset = 0;
   711 		SDL_SetClipRect(mode, NULL);
   712 		SDL_ClearSurface(mode);
   713 
   714 		/* Now adjust the offsets to match the desired mode */
   715 		video->offset_x = (mode->w-width)/2;
   716 		video->offset_y = (mode->h-height)/2;
   717 		mode->offset = video->offset_y*mode->pitch +
   718 				video->offset_x*mode->format->BytesPerPixel;
   719 #ifdef DEBUG_VIDEO
   720   fprintf(stderr,
   721 	"Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",
   722 		width, height, bpp,
   723 		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);
   724 #endif
   725 		mode->w = width;
   726 		mode->h = height;
   727 		SDL_SetClipRect(mode, NULL);
   728 	}
   729 	SDL_ResetCursor();
   730 	SDL_UnlockCursor();
   731 
   732 	/* If we failed setting a video mode, return NULL... (Uh Oh!) */
   733 	if ( mode == NULL ) {
   734 		return(NULL);
   735 	}
   736 
   737 	/* If there is no window manager, set the SDL_NOFRAME flag */
   738 	if ( ! video->info.wm_available ) {
   739 		mode->flags |= SDL_NOFRAME;
   740 	}
   741 
   742 	/* Reset the mouse cursor and grab for new video mode */
   743 	SDL_SetCursor(NULL);
   744 	if ( video->UpdateMouse ) {
   745 		video->UpdateMouse(this);
   746 	}
   747 	SDL_WM_GrabInput(saved_grab);
   748 	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */
   749 
   750 #if SDL_VIDEO_OPENGL
   751 	/* Load GL symbols (before MakeCurrent, where we need glGetString). */
   752 	if ( flags & (SDL_OPENGL | SDL_OPENGLBLIT) ) {
   753 
   754 #if defined(__QNXNTO__) && (_NTO_VERSION < 630)
   755 #define __SDL_NOGETPROCADDR__
   756 #elif defined(__MINT__)
   757 #define __SDL_NOGETPROCADDR__
   758 #endif
   759 #ifdef __SDL_NOGETPROCADDR__
   760     #define SDL_PROC(ret,func,params) video->func=func;
   761 #else
   762     #define SDL_PROC(ret,func,params) \
   763     do { \
   764         video->func = SDL_GL_GetProcAddress(#func); \
   765         if ( ! video->func ) { \
   766             SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
   767         return(NULL); \
   768         } \
   769     } while ( 0 );
   770 
   771 #endif /* __SDL_NOGETPROCADDR__ */
   772 
   773 #include "SDL_glfuncs.h"
   774 #undef SDL_PROC	
   775 	}
   776 #endif /* SDL_VIDEO_OPENGL */
   777 
   778 	/* If we're running OpenGL, make the context current */
   779 	if ( (video->screen->flags & SDL_OPENGL) &&
   780 	      video->GL_MakeCurrent ) {
   781 		if ( video->GL_MakeCurrent(this) < 0 ) {
   782 			return(NULL);
   783 		}
   784 	}
   785 
   786 	/* Set up a fake SDL surface for OpenGL "blitting" */
   787 	if ( (flags & SDL_OPENGLBLIT) == SDL_OPENGLBLIT ) {
   788 		/* Load GL functions for performing the texture updates */
   789 #if SDL_VIDEO_OPENGL
   790 
   791 		/* Create a software surface for blitting */
   792 #ifdef GL_VERSION_1_2
   793 		/* If the implementation either supports the packed pixels
   794 		   extension, or implements the core OpenGL 1.2 API, it will
   795 		   support the GL_UNSIGNED_SHORT_5_6_5 texture format.
   796 		 */
   797 		if ( (bpp == 16) &&
   798 		     (SDL_strstr((const char *)video->glGetString(GL_EXTENSIONS), "GL_EXT_packed_pixels") ||
   799 		     (SDL_atof((const char *)video->glGetString(GL_VERSION)) >= 1.2f))
   800 		   ) {
   801 			video->is_32bit = 0;
   802 			SDL_VideoSurface = SDL_CreateRGBSurface(
   803 				flags, 
   804 				width, 
   805 				height,  
   806 				16,
   807 				31 << 11,
   808 				63 << 5,
   809 				31,
   810 				0
   811 				);
   812 		}
   813 		else
   814 #endif /* OpenGL 1.2 */
   815 		{
   816 			video->is_32bit = 1;
   817 			SDL_VideoSurface = SDL_CreateRGBSurface(
   818 				flags, 
   819 				width, 
   820 				height, 
   821 				32, 
   822 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   823 				0x000000FF,
   824 				0x0000FF00,
   825 				0x00FF0000,
   826 				0xFF000000
   827 #else
   828 				0xFF000000,
   829 				0x00FF0000,
   830 				0x0000FF00,
   831 				0x000000FF
   832 #endif
   833 				);
   834 		}
   835 		if ( ! SDL_VideoSurface ) {
   836 			return(NULL);
   837 		}
   838 		SDL_VideoSurface->flags = mode->flags | SDL_OPENGLBLIT;
   839 
   840 		/* Free the original video mode surface (is this safe?) */
   841 		SDL_FreeSurface(mode);
   842 
   843 		/* Set the surface completely opaque & white by default */
   844 		SDL_memset( SDL_VideoSurface->pixels, 255, SDL_VideoSurface->h * SDL_VideoSurface->pitch );
   845 		video->glGenTextures( 1, &video->texture );
   846 		video->glBindTexture( GL_TEXTURE_2D, video->texture );
   847 		video->glTexImage2D(
   848 			GL_TEXTURE_2D,
   849 			0,
   850 			video->is_32bit ? GL_RGBA : GL_RGB,
   851 			256,
   852 			256,
   853 			0,
   854 			video->is_32bit ? GL_RGBA : GL_RGB,
   855 #ifdef GL_VERSION_1_2
   856 			video->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
   857 #else
   858 			GL_UNSIGNED_BYTE,
   859 #endif
   860 			NULL);
   861 
   862 		video->UpdateRects = SDL_GL_UpdateRectsLock;
   863 #else
   864 		SDL_SetError("Somebody forgot to #define SDL_VIDEO_OPENGL");
   865 		return(NULL);
   866 #endif
   867 	}
   868 
   869 	/* Create a shadow surface if necessary */
   870 	/* There are three conditions under which we create a shadow surface:
   871 		1.  We need a particular bits-per-pixel that we didn't get.
   872 		2.  We need a hardware palette and didn't get one.
   873 		3.  We need a software surface and got a hardware surface.
   874 	*/
   875 	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&
   876 	     (
   877 	     (  !(flags&SDL_ANYFORMAT) &&
   878 			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||
   879 	     (   (flags&SDL_HWPALETTE) && 
   880 				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||
   881 		/* If the surface is in hardware, video writes are visible
   882 		   as soon as they are performed, so we need to buffer them
   883 		 */
   884 	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&
   885 				(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
   886 	     (   (flags&SDL_DOUBLEBUF) &&
   887 				(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
   888 				!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
   889 	     ) ) {
   890 		SDL_CreateShadowSurface(bpp);
   891 		if ( SDL_ShadowSurface == NULL ) {
   892 			SDL_SetError("Couldn't create shadow surface");
   893 			return(NULL);
   894 		}
   895 		SDL_PublicSurface = SDL_ShadowSurface;
   896 	} else {
   897 		SDL_PublicSurface = SDL_VideoSurface;
   898 	}
   899 	video->info.vfmt = SDL_VideoSurface->format;
   900 	video->info.current_w = SDL_VideoSurface->w;
   901 	video->info.current_h = SDL_VideoSurface->h;
   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 = (Sint16)x;
  1009 		rect.y = (Sint16)y;
  1010 		rect.w = (Uint16)w;
  1011 		rect.h = (Uint16)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->flags & (SDL_OPENGL | SDL_OPENGLBLIT)) == SDL_OPENGL ) {
  1022 		SDL_SetError("OpenGL active, use SDL_GL_SwapBuffers()");
  1023 		return;
  1024 	}
  1025 	if ( screen == SDL_ShadowSurface ) {
  1026 		/* Blit the shadow surface using saved mapping */
  1027 		SDL_Palette *pal = screen->format->palette;
  1028 		SDL_Color *saved_colors = NULL;
  1029 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1030 			/* simulated 8bpp, use correct physical palette */
  1031 			saved_colors = pal->colors;
  1032 			if ( video->gammacols ) {
  1033 				/* gamma-corrected palette */
  1034 				pal->colors = video->gammacols;
  1035 			} else if ( video->physpal ) {
  1036 				/* physical palette different from logical */
  1037 				pal->colors = video->physpal->colors;
  1038 			}
  1039 		}
  1040 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1041 			SDL_LockCursor();
  1042 			SDL_DrawCursor(SDL_ShadowSurface);
  1043 			for ( i=0; i<numrects; ++i ) {
  1044 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1045 						SDL_VideoSurface, &rects[i]);
  1046 			}
  1047 			SDL_EraseCursor(SDL_ShadowSurface);
  1048 			SDL_UnlockCursor();
  1049 		} else {
  1050 			for ( i=0; i<numrects; ++i ) {
  1051 				SDL_LowerBlit(SDL_ShadowSurface, &rects[i], 
  1052 						SDL_VideoSurface, &rects[i]);
  1053 			}
  1054 		}
  1055 		if ( saved_colors ) {
  1056 			pal->colors = saved_colors;
  1057 		}
  1058 
  1059 		/* Fall through to video surface update */
  1060 		screen = SDL_VideoSurface;
  1061 	}
  1062 	if ( screen == SDL_VideoSurface ) {
  1063 		/* Update the video surface */
  1064 		if ( screen->offset ) {
  1065 			for ( i=0; i<numrects; ++i ) {
  1066 				rects[i].x += video->offset_x;
  1067 				rects[i].y += video->offset_y;
  1068 			}
  1069 			video->UpdateRects(this, numrects, rects);
  1070 			for ( i=0; i<numrects; ++i ) {
  1071 				rects[i].x -= video->offset_x;
  1072 				rects[i].y -= video->offset_y;
  1073 			}
  1074 		} else {
  1075 			video->UpdateRects(this, numrects, rects);
  1076 		}
  1077 	}
  1078 }
  1079 
  1080 /*
  1081  * Performs hardware double buffering, if possible, or a full update if not.
  1082  */
  1083 int SDL_Flip(SDL_Surface *screen)
  1084 {
  1085 	SDL_VideoDevice *video = current_video;
  1086 	/* Copy the shadow surface to the video surface */
  1087 	if ( screen == SDL_ShadowSurface ) {
  1088 		SDL_Rect rect;
  1089 		SDL_Palette *pal = screen->format->palette;
  1090 		SDL_Color *saved_colors = NULL;
  1091 		if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
  1092 			/* simulated 8bpp, use correct physical palette */
  1093 			saved_colors = pal->colors;
  1094 			if ( video->gammacols ) {
  1095 				/* gamma-corrected palette */
  1096 				pal->colors = video->gammacols;
  1097 			} else if ( video->physpal ) {
  1098 				/* physical palette different from logical */
  1099 				pal->colors = video->physpal->colors;
  1100 			}
  1101 		}
  1102 
  1103 		rect.x = 0;
  1104 		rect.y = 0;
  1105 		rect.w = screen->w;
  1106 		rect.h = screen->h;
  1107 		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {
  1108 			SDL_LockCursor();
  1109 			SDL_DrawCursor(SDL_ShadowSurface);
  1110 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1111 					SDL_VideoSurface, &rect);
  1112 			SDL_EraseCursor(SDL_ShadowSurface);
  1113 			SDL_UnlockCursor();
  1114 		} else {
  1115 			SDL_LowerBlit(SDL_ShadowSurface, &rect,
  1116 					SDL_VideoSurface, &rect);
  1117 		}
  1118 		if ( saved_colors ) {
  1119 			pal->colors = saved_colors;
  1120 		}
  1121 
  1122 		/* Fall through to video surface update */
  1123 		screen = SDL_VideoSurface;
  1124 	}
  1125 	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
  1126 		SDL_VideoDevice *this  = current_video;
  1127 		return(video->FlipHWSurface(this, SDL_VideoSurface));
  1128 	} else {
  1129 		SDL_UpdateRect(screen, 0, 0, 0, 0);
  1130 	}
  1131 	return(0);
  1132 }
  1133 
  1134 static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,
  1135 			       int firstcolor, int ncolors)
  1136 {
  1137 	SDL_Palette *pal = screen->format->palette;
  1138 	SDL_Palette *vidpal;
  1139 
  1140 	if ( colors != (pal->colors + firstcolor) ) {
  1141 		SDL_memcpy(pal->colors + firstcolor, colors,
  1142 		       ncolors * sizeof(*colors));
  1143 	}
  1144 
  1145 	if ( current_video && SDL_VideoSurface ) {
  1146 		vidpal = SDL_VideoSurface->format->palette;
  1147 		if ( (screen == SDL_ShadowSurface) && vidpal ) {
  1148 			/*
  1149 			 * This is a shadow surface, and the physical
  1150 			 * framebuffer is also indexed. Propagate the
  1151 			 * changes to its logical palette so that
  1152 			 * updates are always identity blits
  1153 			 */
  1154 			SDL_memcpy(vidpal->colors + firstcolor, colors,
  1155 			       ncolors * sizeof(*colors));
  1156 		}
  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 		SDL_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 = SDL_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 ( !screen ) {
  1250 		return 0;
  1251 	}
  1252 	if ( !current_video || 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->physpal && !(which & SDL_LOGPAL) ) {
  1289 			/* Lazy physical palette allocation */
  1290 			int size;
  1291 			SDL_Palette *pp = SDL_malloc(sizeof(*pp));
  1292 			if ( !pp ) {
  1293 				return 0;
  1294 			}
  1295 			video->physpal = pp;
  1296 			pp->ncolors = pal->ncolors;
  1297 			size = pp->ncolors * sizeof(SDL_Color);
  1298 			pp->colors = SDL_malloc(size);
  1299 			if ( !pp->colors ) {
  1300 				return 0;
  1301 			}
  1302 			SDL_memcpy(pp->colors, pal->colors, size);
  1303 		}
  1304 		if ( ! SetPalette_physical(screen,
  1305 		                           colors, firstcolor, ncolors) ) {
  1306 			gotall = 0;
  1307 		}
  1308 	}
  1309 	return gotall;
  1310 }
  1311 
  1312 int SDL_SetColors(SDL_Surface *screen, SDL_Color *colors, int firstcolor,
  1313 		  int ncolors)
  1314 {
  1315 	return SDL_SetPalette(screen, SDL_LOGPAL | SDL_PHYSPAL,
  1316 			      colors, firstcolor, ncolors);
  1317 }
  1318 
  1319 /*
  1320  * Clean up the video subsystem
  1321  */
  1322 void SDL_VideoQuit (void)
  1323 {
  1324 	SDL_Surface *ready_to_go;
  1325 
  1326 	if ( current_video ) {
  1327 		SDL_VideoDevice *video = current_video;
  1328 		SDL_VideoDevice *this  = current_video;
  1329 
  1330 		/* Halt event processing before doing anything else */
  1331 		SDL_StopEventLoop();
  1332 
  1333 		/* Clean up allocated window manager items */
  1334 		if ( SDL_PublicSurface ) {
  1335 			SDL_PublicSurface = NULL;
  1336 		}
  1337 		SDL_CursorQuit();
  1338 
  1339 		/* Just in case... */
  1340 		SDL_WM_GrabInputOff();
  1341 
  1342 		/* Clean up the system video */
  1343 		video->VideoQuit(this);
  1344 
  1345 		/* Free any lingering surfaces */
  1346 		ready_to_go = SDL_ShadowSurface;
  1347 		SDL_ShadowSurface = NULL;
  1348 		SDL_FreeSurface(ready_to_go);
  1349 		if ( SDL_VideoSurface != NULL ) {
  1350 			ready_to_go = SDL_VideoSurface;
  1351 			SDL_VideoSurface = NULL;
  1352 			SDL_FreeSurface(ready_to_go);
  1353 		}
  1354 		SDL_PublicSurface = NULL;
  1355 
  1356 		/* Clean up miscellaneous memory */
  1357 		if ( video->physpal ) {
  1358 			SDL_free(video->physpal->colors);
  1359 			SDL_free(video->physpal);
  1360 			video->physpal = NULL;
  1361 		}
  1362 		if ( video->gammacols ) {
  1363 			SDL_free(video->gammacols);
  1364 			video->gammacols = NULL;
  1365 		}
  1366 		if ( video->gamma ) {
  1367 			SDL_free(video->gamma);
  1368 			video->gamma = NULL;
  1369 		}
  1370 		if ( video->wm_title != NULL ) {
  1371 			SDL_free(video->wm_title);
  1372 			video->wm_title = NULL;
  1373 		}
  1374 		if ( video->wm_icon != NULL ) {
  1375 			SDL_free(video->wm_icon);
  1376 			video->wm_icon = NULL;
  1377 		}
  1378 
  1379 		/* Finish cleaning up video subsystem */
  1380 		video->free(this);
  1381 		current_video = NULL;
  1382 	}
  1383 	return;
  1384 }
  1385 
  1386 /* Load the GL driver library */
  1387 int SDL_GL_LoadLibrary(const char *path)
  1388 {
  1389 	SDL_VideoDevice *video = current_video;
  1390 	SDL_VideoDevice *this = current_video;
  1391 	int retval;
  1392 
  1393 	retval = -1;
  1394 	if ( video == NULL ) {
  1395 		SDL_SetError("Video subsystem has not been initialized");
  1396 	} else {
  1397 		if ( video->GL_LoadLibrary ) {
  1398 			retval = video->GL_LoadLibrary(this, path);
  1399 		} else {
  1400 			SDL_SetError("No dynamic GL support in video driver");
  1401 		}
  1402 	}
  1403 	return(retval);
  1404 }
  1405 
  1406 void *SDL_GL_GetProcAddress(const char* proc)
  1407 {
  1408 	SDL_VideoDevice *video = current_video;
  1409 	SDL_VideoDevice *this = current_video;
  1410 	void *func;
  1411 
  1412 	func = NULL;
  1413 	if ( video->GL_GetProcAddress ) {
  1414 		if ( video->gl_config.driver_loaded ) {
  1415 			func = video->GL_GetProcAddress(this, proc);
  1416 		} else {
  1417 			SDL_SetError("No GL driver has been loaded");
  1418 		}
  1419 	} else {
  1420 		SDL_SetError("No dynamic GL support in video driver");
  1421 	}
  1422 	return func;
  1423 }
  1424 
  1425 /* Set the specified GL attribute for setting up a GL video mode */
  1426 int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
  1427 {
  1428 	int retval;
  1429 	SDL_VideoDevice *video = current_video;
  1430 
  1431 	retval = 0;
  1432 	switch (attr) {
  1433 		case SDL_GL_RED_SIZE:
  1434 			video->gl_config.red_size = value;
  1435 			break;
  1436 		case SDL_GL_GREEN_SIZE:
  1437 			video->gl_config.green_size = value;
  1438 			break;
  1439 		case SDL_GL_BLUE_SIZE:
  1440 			video->gl_config.blue_size = value;
  1441 			break;
  1442 		case SDL_GL_ALPHA_SIZE:
  1443 			video->gl_config.alpha_size = value;
  1444 			break;
  1445 		case SDL_GL_DOUBLEBUFFER:
  1446 			video->gl_config.double_buffer = value;
  1447 			break;
  1448 		case SDL_GL_BUFFER_SIZE:
  1449 			video->gl_config.buffer_size = value;
  1450 			break;
  1451 		case SDL_GL_DEPTH_SIZE:
  1452 			video->gl_config.depth_size = value;
  1453 			break;
  1454 		case SDL_GL_STENCIL_SIZE:
  1455 			video->gl_config.stencil_size = value;
  1456 			break;
  1457 		case SDL_GL_ACCUM_RED_SIZE:
  1458 			video->gl_config.accum_red_size = value;
  1459 			break;
  1460 		case SDL_GL_ACCUM_GREEN_SIZE:
  1461 			video->gl_config.accum_green_size = value;
  1462 			break;
  1463 		case SDL_GL_ACCUM_BLUE_SIZE:
  1464 			video->gl_config.accum_blue_size = value;
  1465 			break;
  1466 		case SDL_GL_ACCUM_ALPHA_SIZE:
  1467 			video->gl_config.accum_alpha_size = value;
  1468 			break;
  1469 		case SDL_GL_STEREO:
  1470 			video->gl_config.stereo = value;
  1471 			break;
  1472 		case SDL_GL_MULTISAMPLEBUFFERS:
  1473 			video->gl_config.multisamplebuffers = value;
  1474 			break;
  1475 		case SDL_GL_MULTISAMPLESAMPLES:
  1476 			video->gl_config.multisamplesamples = value;
  1477 			break;
  1478 		case SDL_GL_ACCELERATED_VISUAL:
  1479 			video->gl_config.accelerated = value;
  1480 			break;
  1481 		case SDL_GL_SWAP_CONTROL:
  1482 			video->gl_config.swap_control = value;
  1483 			break;
  1484 		default:
  1485 			SDL_SetError("Unknown OpenGL attribute");
  1486 			retval = -1;
  1487 			break;
  1488 	}
  1489 	return(retval);
  1490 }
  1491 
  1492 /* Retrieve an attribute value from the windowing system. */
  1493 int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
  1494 {
  1495 	int retval = -1;
  1496 	SDL_VideoDevice* video = current_video;
  1497 	SDL_VideoDevice* this = current_video;
  1498 
  1499 	if ( video->GL_GetAttribute ) {
  1500 		retval = this->GL_GetAttribute(this, attr, value);
  1501 	} else {
  1502 		*value = 0;
  1503 		SDL_SetError("GL_GetAttribute not supported");
  1504 	}
  1505 	return retval;
  1506 }
  1507 
  1508 /* Perform a GL buffer swap on the current GL context */
  1509 void SDL_GL_SwapBuffers(void)
  1510 {
  1511 	SDL_VideoDevice *video = current_video;
  1512 	SDL_VideoDevice *this = current_video;
  1513 
  1514 	if ( video->screen->flags & SDL_OPENGL ) {
  1515 		video->GL_SwapBuffers(this);
  1516 	} else {
  1517 		SDL_SetError("OpenGL video mode has not been set");
  1518 	}
  1519 }
  1520 
  1521 /* Update rects with locking */
  1522 void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect *rects)
  1523 {
  1524 	SDL_GL_Lock();
  1525  	SDL_GL_UpdateRects(numrects, rects);
  1526 	SDL_GL_Unlock();
  1527 }
  1528 
  1529 /* Update rects without state setting and changing (the caller is responsible for it) */
  1530 void SDL_GL_UpdateRects(int numrects, SDL_Rect *rects)
  1531 {
  1532 #if SDL_VIDEO_OPENGL
  1533 	SDL_VideoDevice *this = current_video;
  1534 	SDL_Rect update, tmp;
  1535 	int x, y, i;
  1536 
  1537 	for ( i = 0; i < numrects; i++ )
  1538 	{
  1539 		tmp.y = rects[i].y;
  1540 		tmp.h = rects[i].h;
  1541 		for ( y = 0; y <= rects[i].h / 256; y++ )
  1542 		{
  1543 			tmp.x = rects[i].x;
  1544 			tmp.w = rects[i].w;
  1545 			for ( x = 0; x <= rects[i].w / 256; x++ )
  1546 			{
  1547 				update.x = tmp.x;
  1548 				update.y = tmp.y;
  1549 				update.w = tmp.w;
  1550 				update.h = tmp.h;
  1551 
  1552 				if ( update.w > 256 )
  1553 					update.w = 256;
  1554 
  1555 				if ( update.h > 256 )
  1556 					update.h = 256;
  1557 			
  1558 				this->glFlush();
  1559 				this->glTexSubImage2D( 
  1560 					GL_TEXTURE_2D, 
  1561 					0, 
  1562 					0, 
  1563 					0, 
  1564 					update.w, 
  1565 					update.h, 
  1566 					this->is_32bit? GL_RGBA : GL_RGB,
  1567 #ifdef GL_VERSION_1_2
  1568 					this->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
  1569 #else
  1570 					GL_UNSIGNED_BYTE,
  1571 #endif
  1572 					(Uint8 *)this->screen->pixels + 
  1573 						this->screen->format->BytesPerPixel * update.x + 
  1574 						update.y * this->screen->pitch );
  1575 	
  1576 				this->glFlush();
  1577 				/*
  1578 				* Note the parens around the function name:
  1579 				* This is because some OpenGL implementations define glTexCoord etc 
  1580 				* as macros, and we don't want them expanded here.
  1581 				*/
  1582 				this->glBegin(GL_TRIANGLE_STRIP);
  1583 					(this->glTexCoord2f)( 0.0, 0.0 );	
  1584 					(this->glVertex2i)( update.x, update.y );
  1585 					(this->glTexCoord2f)( (float)(update.w / 256.0), 0.0 );	
  1586 					(this->glVertex2i)( update.x + update.w, update.y );
  1587 					(this->glTexCoord2f)( 0.0, (float)(update.h / 256.0) );
  1588 					(this->glVertex2i)( update.x, update.y + update.h );
  1589 					(this->glTexCoord2f)( (float)(update.w / 256.0), (float)(update.h / 256.0) );	
  1590 					(this->glVertex2i)( update.x + update.w	, update.y + update.h );
  1591 				this->glEnd();	
  1592 			
  1593 				tmp.x += 256;
  1594 				tmp.w -= 256;
  1595 			}
  1596 			tmp.y += 256;
  1597 			tmp.h -= 256;
  1598 		}
  1599 	}
  1600 #endif
  1601 }
  1602 
  1603 /* Lock == save current state */
  1604 void SDL_GL_Lock()
  1605 {
  1606 #if SDL_VIDEO_OPENGL
  1607 	lock_count--;
  1608 	if (lock_count==-1)
  1609 	{
  1610 		SDL_VideoDevice *this = current_video;
  1611 
  1612 		this->glPushAttrib( GL_ALL_ATTRIB_BITS );	/* TODO: narrow range of what is saved */
  1613 #ifdef GL_CLIENT_PIXEL_STORE_BIT
  1614 		this->glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
  1615 #endif
  1616 
  1617 		this->glEnable(GL_TEXTURE_2D);
  1618 		this->glEnable(GL_BLEND);
  1619 		this->glDisable(GL_FOG);
  1620 		this->glDisable(GL_ALPHA_TEST);
  1621 		this->glDisable(GL_DEPTH_TEST);
  1622 		this->glDisable(GL_SCISSOR_TEST);	
  1623 		this->glDisable(GL_STENCIL_TEST);
  1624 		this->glDisable(GL_CULL_FACE);
  1625 
  1626 		this->glBindTexture( GL_TEXTURE_2D, this->texture );
  1627 		this->glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
  1628 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  1629 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  1630 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  1631 		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  1632 
  1633 		this->glPixelStorei( GL_UNPACK_ROW_LENGTH, this->screen->pitch / this->screen->format->BytesPerPixel );
  1634 		this->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  1635 		(this->glColor4f)(1.0, 1.0, 1.0, 1.0);		/* Solaris workaround */
  1636 
  1637 		this->glViewport(0, 0, this->screen->w, this->screen->h);
  1638 		this->glMatrixMode(GL_PROJECTION);
  1639 		this->glPushMatrix();
  1640 		this->glLoadIdentity();
  1641 
  1642 		this->glOrtho(0.0, (GLdouble) this->screen->w, (GLdouble) this->screen->h, 0.0, 0.0, 1.0);
  1643 
  1644 		this->glMatrixMode(GL_MODELVIEW);
  1645 		this->glPushMatrix();
  1646 		this->glLoadIdentity();
  1647 	}
  1648 #endif
  1649 }
  1650 
  1651 /* Unlock == restore saved state */
  1652 void SDL_GL_Unlock()
  1653 {
  1654 #if SDL_VIDEO_OPENGL
  1655 	lock_count++;
  1656 	if (lock_count==0)
  1657 	{
  1658 		SDL_VideoDevice *this = current_video;
  1659 
  1660 		this->glPopMatrix();
  1661 		this->glMatrixMode(GL_PROJECTION);
  1662 		this->glPopMatrix();
  1663 
  1664 		this->glPopClientAttrib();
  1665 		this->glPopAttrib();
  1666 	}
  1667 #endif
  1668 }
  1669 
  1670 /*
  1671  * Sets/Gets the title and icon text of the display window, if any.
  1672  */
  1673 void SDL_WM_SetCaption (const char *title, const char *icon)
  1674 {
  1675 	SDL_VideoDevice *video = current_video;
  1676 	SDL_VideoDevice *this  = current_video;
  1677 
  1678 	if ( video ) {
  1679 		if ( title ) {
  1680 			if ( video->wm_title ) {
  1681 				SDL_free(video->wm_title);
  1682 			}
  1683 			video->wm_title = SDL_strdup(title);
  1684 		}
  1685 		if ( icon ) {
  1686 			if ( video->wm_icon ) {
  1687 				SDL_free(video->wm_icon);
  1688 			}
  1689 			video->wm_icon = SDL_strdup(icon);
  1690 		}
  1691 		if ( (title || icon) && (video->SetCaption != NULL) ) {
  1692 			video->SetCaption(this, video->wm_title,video->wm_icon);
  1693 		}
  1694 	}
  1695 }
  1696 void SDL_WM_GetCaption (char **title, char **icon)
  1697 {
  1698 	SDL_VideoDevice *video = current_video;
  1699 
  1700 	if ( video ) {
  1701 		if ( title ) {
  1702 			*title = video->wm_title;
  1703 		}
  1704 		if ( icon ) {
  1705 			*icon = video->wm_icon;
  1706 		}
  1707 	}
  1708 }
  1709 
  1710 /* Utility function used by SDL_WM_SetIcon();
  1711  * flags & 1 for color key, flags & 2 for alpha channel. */
  1712 static void CreateMaskFromColorKeyOrAlpha(SDL_Surface *icon, Uint8 *mask, int flags)
  1713 {
  1714 	int x, y;
  1715 	Uint32 colorkey;
  1716 #define SET_MASKBIT(icon, x, y, mask) \
  1717 	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))
  1718 
  1719 	colorkey = icon->format->colorkey;
  1720 	switch (icon->format->BytesPerPixel) {
  1721 		case 1: { Uint8 *pixels;
  1722 			for ( y=0; y<icon->h; ++y ) {
  1723 				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
  1724 				for ( x=0; x<icon->w; ++x ) {
  1725 					if ( *pixels++ == colorkey ) {
  1726 						SET_MASKBIT(icon, x, y, mask);
  1727 					}
  1728 				}
  1729 			}
  1730 		}
  1731 		break;
  1732 
  1733 		case 2: { Uint16 *pixels;
  1734 			for ( y=0; y<icon->h; ++y ) {
  1735 				pixels = (Uint16 *)icon->pixels +
  1736 				                   y*icon->pitch/2;
  1737 				for ( x=0; x<icon->w; ++x ) {
  1738 					if ( (flags & 1) && *pixels == colorkey ) {
  1739 						SET_MASKBIT(icon, x, y, mask);
  1740 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1741 						SET_MASKBIT(icon, x, y, mask);
  1742 					}
  1743 					pixels++;
  1744 				}
  1745 			}
  1746 		}
  1747 		break;
  1748 
  1749 		case 4: { Uint32 *pixels;
  1750 			for ( y=0; y<icon->h; ++y ) {
  1751 				pixels = (Uint32 *)icon->pixels +
  1752 				                   y*icon->pitch/4;
  1753 				for ( x=0; x<icon->w; ++x ) {
  1754 					if ( (flags & 1) && *pixels == colorkey ) {
  1755 						SET_MASKBIT(icon, x, y, mask);
  1756 					} else if((flags & 2) && (*pixels & icon->format->Amask) == 0) {
  1757 						SET_MASKBIT(icon, x, y, mask);
  1758 					}
  1759 					pixels++;
  1760 				}
  1761 			}
  1762 		}
  1763 		break;
  1764 	}
  1765 }
  1766 
  1767 /*
  1768  * Sets the window manager icon for the display window.
  1769  */
  1770 void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
  1771 {
  1772 	SDL_VideoDevice *video = current_video;
  1773 	SDL_VideoDevice *this  = current_video;
  1774 
  1775 	if ( icon && video->SetIcon ) {
  1776 		/* Generate a mask if necessary, and create the icon! */
  1777 		if ( mask == NULL ) {
  1778 			int mask_len = icon->h*(icon->w+7)/8;
  1779 			int flags = 0;
  1780 			mask = (Uint8 *)SDL_malloc(mask_len);
  1781 			if ( mask == NULL ) {
  1782 				return;
  1783 			}
  1784 			SDL_memset(mask, ~0, mask_len);
  1785 			if ( icon->flags & SDL_SRCCOLORKEY ) flags |= 1;
  1786 			if ( icon->flags & SDL_SRCALPHA ) flags |= 2;
  1787 			if( flags ) {
  1788 				CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
  1789 			}
  1790 			video->SetIcon(video, icon, mask);
  1791 			SDL_free(mask);
  1792 		} else {
  1793 			video->SetIcon(this, icon, mask);
  1794 		}
  1795 	}
  1796 }
  1797 
  1798 /*
  1799  * Grab or ungrab the keyboard and mouse input.
  1800  * This function returns the final grab mode after calling the
  1801  * driver dependent function.
  1802  */
  1803 static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
  1804 {
  1805 	SDL_VideoDevice *video = current_video;
  1806 	SDL_VideoDevice *this  = current_video;
  1807 
  1808 	/* Only do something if we have support for grabs */
  1809 	if ( video->GrabInput == NULL ) {
  1810 		return(video->input_grab);
  1811 	}
  1812 
  1813 	/* If the final grab mode if off, only then do we actually grab */
  1814 #ifdef DEBUG_GRAB
  1815   printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
  1816 #endif
  1817 	if ( mode == SDL_GRAB_OFF ) {
  1818 		if ( video->input_grab != SDL_GRAB_OFF ) {
  1819 			mode = video->GrabInput(this, mode);
  1820 		}
  1821 	} else {
  1822 		if ( video->input_grab == SDL_GRAB_OFF ) {
  1823 			mode = video->GrabInput(this, mode);
  1824 		}
  1825 	}
  1826 	if ( mode != video->input_grab ) {
  1827 		video->input_grab = mode;
  1828 		if ( video->CheckMouseMode ) {
  1829 			video->CheckMouseMode(this);
  1830 		}
  1831 	}
  1832 #ifdef DEBUG_GRAB
  1833   printf("Final mode %d\n", video->input_grab);
  1834 #endif
  1835 
  1836 	/* Return the final grab state */
  1837 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1838 		mode -= SDL_GRAB_FULLSCREEN;
  1839 	}
  1840 	return(mode);
  1841 }
  1842 SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
  1843 {
  1844 	SDL_VideoDevice *video = current_video;
  1845 
  1846 	/* If the video isn't initialized yet, we can't do anything */
  1847 	if ( ! video ) {
  1848 		return SDL_GRAB_OFF;
  1849 	}
  1850 
  1851 	/* Return the current mode on query */
  1852 	if ( mode == SDL_GRAB_QUERY ) {
  1853 		mode = video->input_grab;
  1854 		if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1855 			mode -= SDL_GRAB_FULLSCREEN;
  1856 		}
  1857 		return(mode);
  1858 	}
  1859 
  1860 #ifdef DEBUG_GRAB
  1861   printf("SDL_WM_GrabInput(%d) ... ", mode);
  1862 #endif
  1863 	/* If the video surface is fullscreen, we always grab */
  1864 	if ( mode >= SDL_GRAB_FULLSCREEN ) {
  1865 		mode -= SDL_GRAB_FULLSCREEN;
  1866 	}
  1867 	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
  1868 		mode += SDL_GRAB_FULLSCREEN;
  1869 	}
  1870 	return(SDL_WM_GrabInputRaw(mode));
  1871 }
  1872 static SDL_GrabMode SDL_WM_GrabInputOff(void)
  1873 {
  1874 	SDL_GrabMode mode;
  1875 
  1876 	/* First query the current grab state */
  1877 	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
  1878 
  1879 	/* Now explicitly turn off input grab */
  1880 	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);
  1881 
  1882 	/* Return the old state */
  1883 	return(mode);
  1884 }
  1885 
  1886 /*
  1887  * Iconify the window in window managed environments.
  1888  * A successful iconification will result in an SDL_APPACTIVE loss event.
  1889  */
  1890 int SDL_WM_IconifyWindow(void)
  1891 {
  1892 	SDL_VideoDevice *video = current_video;
  1893 	SDL_VideoDevice *this  = current_video;
  1894 	int retval;
  1895 
  1896 	retval = 0;
  1897 	if ( video->IconifyWindow ) {
  1898 		retval = video->IconifyWindow(this);
  1899 	}
  1900 	return(retval);
  1901 }
  1902 
  1903 /*
  1904  * Toggle fullscreen mode
  1905  */
  1906 int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
  1907 {
  1908 	SDL_VideoDevice *video = current_video;
  1909 	SDL_VideoDevice *this  = current_video;
  1910 	int toggled;
  1911 
  1912 	toggled = 0;
  1913 	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
  1914 	     video->ToggleFullScreen ) {
  1915 		if ( surface->flags & SDL_FULLSCREEN ) {
  1916 			toggled = video->ToggleFullScreen(this, 0);
  1917 			if ( toggled ) {
  1918 				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
  1919 				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
  1920 			}
  1921 		} else {
  1922 			toggled = video->ToggleFullScreen(this, 1);
  1923 			if ( toggled ) {
  1924 				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
  1925 				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
  1926 			}
  1927 		}
  1928 		/* Double-check the grab state inside SDL_WM_GrabInput() */
  1929 		if ( toggled ) {
  1930 			SDL_WM_GrabInput(video->input_grab);
  1931 		}
  1932 	}
  1933 	return(toggled);
  1934 }
  1935 
  1936 /*
  1937  * Get some platform dependent window manager information
  1938  */
  1939 int SDL_GetWMInfo (SDL_SysWMinfo *info)
  1940 {
  1941 	SDL_VideoDevice *video = current_video;
  1942 	SDL_VideoDevice *this  = current_video;
  1943 
  1944 	if ( video && video->GetWMInfo ) {
  1945 		return(video->GetWMInfo(this, info));
  1946 	} else {
  1947 		return(0);
  1948 	}
  1949 }