sdl_x11video.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

	if(X11_GetVideoModes(this) < 0)
	    return -1;

	/* Determine the default screen depth:
	   Use the default visual (or at least one with the same depth) */
	SDL_DisplayColormap = DefaultColormap(SDL_Display, SDL_Screen);
	for(i = 0; i < this->hidden->nvisuals; i++)
	    if(this->hidden->visuals[i].depth == DefaultDepth(SDL_Display,
							      SDL_Screen))
		break;
	if(i == this->hidden->nvisuals) {
	    /* default visual was useless, take the deepest one instead */
	    i = 0;
	}
	SDL_Visual = this->hidden->visuals[i].visual;
	if ( SDL_Visual == DefaultVisual(SDL_Display, SDL_Screen) ) {
	    SDL_XColorMap = SDL_DisplayColormap;
	} else {
	    SDL_XColorMap = XCreateColormap(SDL_Display, SDL_Root,
					    SDL_Visual, AllocNone);
	}
	this->hidden->depth = this->hidden->visuals[i].depth;
	vformat->BitsPerPixel = this->hidden->visuals[i].bpp;
	if ( vformat->BitsPerPixel > 8 ) {
		vformat->Rmask = SDL_Visual->red_mask;
	  	vformat->Gmask = SDL_Visual->green_mask;
	  	vformat->Bmask = SDL_Visual->blue_mask;
	}
	X11_SaveVidModeGamma(this);

	/* See if we have been passed a window to use */
	SDL_windowid = getenv("SDL_WINDOWID");

	/* Create the fullscreen and managed windows */
	create_aux_windows(this);

	/* Create the blank cursor */
	SDL_BlankCursor = this->CreateWMCursor(this, blank_cdata, blank_cmask,
					BLANK_CWIDTH, BLANK_CHEIGHT,
						BLANK_CHOTX, BLANK_CHOTY);

	/* Fill in some window manager capabilities */
	this->info.wm_available = 1;

	/* We're done! */
	XFlush(SDL_Display);
	return(0);
}

static void X11_DestroyWindow(_THIS, SDL_Surface *screen)
{
	/* Clean up OpenGL */
	if ( screen ) {
		screen->flags &= ~(SDL_OPENGL|SDL_OPENGLBLIT);
	}
	X11_GL_Shutdown(this);

	if ( ! SDL_windowid ) {
		/* Hide the managed window */
		if ( WMwindow ) {
			XUnmapWindow(SDL_Display, WMwindow);
		}
		if ( screen && (screen->flags & SDL_FULLSCREEN) ) {
			screen->flags &= ~SDL_FULLSCREEN;
			X11_LeaveFullScreen(this);
		}

		/* Destroy the output window */
		if ( SDL_Window ) {
			XDestroyWindow(SDL_Display, SDL_Window);
		}

		/* Free the colormap entries */
		if ( SDL_XPixels ) {
			int numcolors;
			unsigned long pixel;
			numcolors = SDL_Visual->map_entries;
			for ( pixel=0; pixel<numcolors; ++pixel ) {
				while ( SDL_XPixels[pixel] > 0 ) {
					XFreeColors(GFX_Display,
						SDL_DisplayColormap,&pixel,1,0);
					--SDL_XPixels[pixel];
				}
			}
			free(SDL_XPixels);
			SDL_XPixels = NULL;
		} 

		/* Free the graphics context */
		if ( SDL_GC ) {
			XFreeGC(SDL_Display, SDL_GC);
			SDL_GC = 0;
		}
	}
}

static void X11_SetSizeHints(_THIS, int w, int h, Uint32 flags)
{
	XSizeHints *hints;

	hints = XAllocSizeHints();
	if ( hints ) {
		if ( flags & SDL_RESIZABLE ) {
			hints->min_width = 32;
			hints->min_height = 32;
			hints->max_height = 4096;
			hints->max_width = 4096;
		} else {
			hints->min_width = hints->max_width = w;
			hints->min_height = hints->max_height = h;
		}
		hints->flags = PMaxSize | PMinSize;
		if ( flags & SDL_FULLSCREEN ) {
			hints->x = 0;
			hints->y = 0;
			hints->flags |= USPosition;
		} else
		/* Center it, if desired */
		if ( getenv("SDL_VIDEO_CENTERED") ) {
			int display_w, display_h;

			display_w = DisplayWidth(SDL_Display, SDL_Screen);
			display_h = DisplayHeight(SDL_Display, SDL_Screen);
			hints->x = (display_w - w)/2;
			hints->y = (display_h - h)/2;
			hints->flags |= USPosition;
			XMoveWindow(SDL_Display, WMwindow, hints->x, hints->y);

			/* Flush the resize event so we don't catch it later */
			XSync(SDL_Display, True);
		}
		XSetWMNormalHints(SDL_Display, WMwindow, hints);
		XFree(hints);
	}

	/* Respect the window caption style */
	if ( flags & SDL_NOFRAME ) {
		SDL_bool set;
		Atom WM_HINTS;

		/* We haven't modified the window manager hints yet */
		set = SDL_FALSE;

		/* First try to set MWM hints */
		WM_HINTS = XInternAtom(SDL_Display, "_MOTIF_WM_HINTS", True);
		if ( WM_HINTS != None ) {
			/* Hints used by Motif compliant window managers */
			struct {
				unsigned long flags;
				unsigned long functions;
				unsigned long decorations;
				long input_mode;
				unsigned long status;
			} MWMHints = { (1L << 1), 0, 0, 0, 0 };

			XChangeProperty(SDL_Display, WMwindow,
			                WM_HINTS, WM_HINTS, 32,
			                PropModeReplace,
					(unsigned char *)&MWMHints,
					sizeof(MWMHints)/sizeof(long));
			set = SDL_TRUE;
		}
		/* Now try to set KWM hints */
		WM_HINTS = XInternAtom(SDL_Display, "KWM_WIN_DECORATION", True);
		if ( WM_HINTS != None ) {
			long KWMHints = 0;

			XChangeProperty(SDL_Display, WMwindow,
			                WM_HINTS, WM_HINTS, 32,
			                PropModeReplace,
					(unsigned char *)&KWMHints,
					sizeof(KWMHints)/sizeof(long));
			set = SDL_TRUE;
		}
		/* Now try to set GNOME hints */
		WM_HINTS = XInternAtom(SDL_Display, "_WIN_HINTS", True);
		if ( WM_HINTS != None ) {
			long GNOMEHints = 0;

			XChangeProperty(SDL_Display, WMwindow,
			                WM_HINTS, WM_HINTS, 32,
			                PropModeReplace,
					(unsigned char *)&GNOMEHints,
					sizeof(GNOMEHints)/sizeof(long));
			set = SDL_TRUE;
		}
		/* Finally set the transient hints if necessary */
		if ( ! set ) {
			XSetTransientForHint(SDL_Display, WMwindow, SDL_Root);
		}
	} else {
		SDL_bool set;
		Atom WM_HINTS;

		/* We haven't modified the window manager hints yet */
		set = SDL_FALSE;

		/* First try to unset MWM hints */
		WM_HINTS = XInternAtom(SDL_Display, "_MOTIF_WM_HINTS", True);
		if ( WM_HINTS != None ) {
			XDeleteProperty(SDL_Display, WMwindow, WM_HINTS);
			set = SDL_TRUE;
		}
		/* Now try to unset KWM hints */
		WM_HINTS = XInternAtom(SDL_Display, "KWM_WIN_DECORATION", True);
		if ( WM_HINTS != None ) {
			XDeleteProperty(SDL_Display, WMwindow, WM_HINTS);
			set = SDL_TRUE;
		}
		/* Now try to unset GNOME hints */
		WM_HINTS = XInternAtom(SDL_Display, "_WIN_HINTS", True);
		if ( WM_HINTS != None ) {
			XDeleteProperty(SDL_Display, WMwindow, WM_HINTS);
			set = SDL_TRUE;
		}
		/* Finally unset the transient hints if necessary */
		if ( ! set ) {
			/* NOTE: Does this work? */
			XSetTransientForHint(SDL_Display, WMwindow, None);
		}
	}
}

static int X11_CreateWindow(_THIS, SDL_Surface *screen,
			    int w, int h, int bpp, Uint32 flags)
{
	int i, depth;
	Visual *vis;
	int vis_change;

	/* If a window is already present, destroy it and start fresh */
	if ( SDL_Window ) {
		X11_DestroyWindow(this, screen);
	}

	/* See if we have been given a window id */
	if ( SDL_windowid ) {
		SDL_Window = strtol(SDL_windowid, NULL, 0);
	} else {
		SDL_Window = 0;
	}

	/* find out which visual we are going to use */
	if ( flags & SDL_OPENGL ) {
		XVisualInfo *vi;

		vi = X11_GL_GetVisual(this);
		if( !vi ) {
			return -1;
		}
		vis = vi->visual;
		depth = vi->depth;
	} else if ( SDL_windowid ) {
		XWindowAttributes a;

		XGetWindowAttributes(SDL_Display, SDL_Window, &a);
		vis = a.visual;
		depth = a.depth;
	} else {
		for ( i = 0; i < this->hidden->nvisuals; i++ ) {
			if ( this->hidden->visuals[i].bpp == bpp )
				break;
		}
		if ( i == this->hidden->nvisuals ) {
			SDL_SetError("No matching visual for requested depth");
			return -1;	/* should never happen */
		}
		vis = this->hidden->visuals[i].visual;
		depth = this->hidden->visuals[i].depth;
	}
#ifdef X11_DEBUG
        printf("Choosing %s visual at %d bpp - %d colormap entries\n", vis->class == PseudoColor ? "PseudoColor" : (vis->class == TrueColor ? "TrueColor" : (vis->class == DirectColor ? "DirectColor" : "Unknown")), depth, vis->map_entries);
#endif
	vis_change = (vis != SDL_Visual);
	SDL_Visual = vis;
	this->hidden->depth = depth;

	/* Allocate the new pixel format for this video mode */
	if ( ! SDL_ReallocFormat(screen, bpp,
			vis->red_mask, vis->green_mask, vis->blue_mask, 0) )
		return -1;

	/* Create the appropriate colormap */
	if ( SDL_XColorMap != SDL_DisplayColormap ) {
		XFreeColormap(SDL_Display, SDL_XColorMap);
	}
	if ( SDL_Visual->class == PseudoColor ) {
	    int ncolors;

	    /* Allocate the pixel flags */
	    ncolors = SDL_Visual->map_entries;
	    SDL_XPixels = malloc(ncolors * sizeof(int));
	    if(SDL_XPixels == NULL) {
		SDL_OutOfMemory();
		return -1;
	    }
	    memset(SDL_XPixels, 0, ncolors * sizeof(*SDL_XPixels));

	    /* always allocate a private colormap on non-default visuals */
	    if ( SDL_Visual != DefaultVisual(SDL_Display, SDL_Screen) ) {
		flags |= SDL_HWPALETTE;
	    }
	    if ( flags & SDL_HWPALETTE ) {
		screen->flags |= SDL_HWPALETTE;
		SDL_XColorMap = XCreateColormap(SDL_Display, SDL_Root,
		                                SDL_Visual, AllocAll);
	    } else {
		SDL_XColorMap = SDL_DisplayColormap;
	    }
	} else if ( SDL_Visual->class == DirectColor ) {

	    /* Create a colormap which we can manipulate for gamma */
	    SDL_XColorMap = XCreateColormap(SDL_Display, SDL_Root,
		                            SDL_Visual, AllocAll);
            XSync(SDL_Display, False);

	    /* Initialize the colormap to the identity mapping */
	    SDL_GetGammaRamp(0, 0, 0);
	    this->screen = screen;
	    X11_SetGammaRamp(this, this->gamma);
	    this->screen = NULL;
	} else {
	    /* Create a read-only colormap for our window */
	    SDL_XColorMap = XCreateColormap(SDL_Display, SDL_Root,
	                                    SDL_Visual, AllocNone);
	}

	/* Recreate the auxiliary windows, if needed (required for GL) */
	if ( vis_change )
	    create_aux_windows(this);

	if(screen->flags & SDL_HWPALETTE) {
	    /* Since the full-screen window might have got a nonzero background
	       colour (0 is white on some displays), we should reset the
	       background to 0 here since that is what the user expects
	       with a private colormap */
	    XSetWindowBackground(SDL_Display, FSwindow, 0);
	    XClearWindow(SDL_Display, FSwindow);
	}

	/* resize the (possibly new) window manager window */
	if( !SDL_windowid ) {
	        X11_SetSizeHints(this, w, h, flags);
		current_w = w;
		current_h = h;
		XResizeWindow(SDL_Display, WMwindow, w, h);
	}

	/* Create (or use) the X11 display window */
	if ( !SDL_windowid ) {
		if ( flags & SDL_OPENGL ) {
			if ( X11_GL_CreateWindow(this, w, h) < 0 ) {
				return(-1);
			}
		} else {
			XSetWindowAttributes swa;

			swa.background_pixel = 0;
			swa.border_pixel = 0;
			swa.colormap = SDL_XColorMap;
			SDL_Window = XCreateWindow(SDL_Display, WMwindow,
		                           	0, 0, w, h, 0, depth,
		                           	InputOutput, SDL_Visual,
		                           	CWBackPixel | CWBorderPixel
		                           	| CWColormap, &swa);
		}
		/* Only manage our input if we own the window */
		XSelectInput(SDL_Display, SDL_Window,
					( EnterWindowMask | LeaveWindowMask
					| ButtonPressMask | ButtonReleaseMask
					| PointerMotionMask | ExposureMask ));
	}

	/* Create the graphics context here, once we have a window */
	if ( flags & SDL_OPENGL ) {
		if ( X11_GL_CreateContext(this) < 0 ) {
			return(-1);
		} else {
			screen->flags |= SDL_OPENGL;
		}
	} else {
		XGCValues gcv;

		gcv.graphics_exposures = False;
		SDL_GC = XCreateGC(SDL_Display, SDL_Window,
		                   GCGraphicsExposures, &gcv);
		if ( ! SDL_GC ) {
			SDL_SetError("Couldn't create graphics context");
			return(-1);
		}
	}

	/* Set our colormaps when not setting a GL mode */
	if ( ! (flags & SDL_OPENGL) ) {
		XSetWindowColormap(SDL_Display, SDL_Window, SDL_XColorMap);
		if( !SDL_windowid ) {
		    XSetWindowColormap(SDL_Display, FSwindow, SDL_XColorMap);
		    XSetWindowColormap(SDL_Display, WMwindow, SDL_XColorMap);
		}
	}

#if 0 /* This is an experiment - are the graphics faster now? - nope. */
	if ( getenv("SDL_VIDEO_X11_BACKINGSTORE") )
#endif
	/* Cache the window in the server, when possible */
	{
		Screen *xscreen;
		XSetWindowAttributes a;

		xscreen = ScreenOfDisplay(SDL_Display, SDL_Screen);
		a.backing_store = DoesBackingStore(xscreen);
		if ( a.backing_store != NotUseful ) {
			XChangeWindowAttributes(SDL_Display, SDL_Window,
			                        CWBackingStore, &a);
		}