sdl_x11video.c

Simple DirectMedia Layer - Simple DirectMedia Layer 是一个跨平台的多媒体库设计用来提供快速图形framebuffer和音频驱动。应用MPEG为软件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_x11video.c,v 1.13 2002/09/30 00:35:25 slouken Exp $";
#endif

/* X11 based SDL video driver implementation.
   Note:  This implementation does not currently need X11 thread locking,
          since the event thread uses a separate X connection and any
          additional locking necessary is handled internally.  However,
          if full locking is neccessary, take a look at XInitThreads().
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#ifdef MTRR_SUPPORT
#include <asm/mtrr.h>
#include <sys/fcntl.h>
#endif

#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif

#ifdef HAVE_ALLOCA
#define ALLOCA(n) ((void*)alloca(n))
#define FREEA(p)
#else
#define ALLOCA(n) malloc(n)
#define FREEA(p) free(p)
#endif

#include "SDL.h"
#include "SDL_error.h"
#include "SDL_timer.h"
#include "SDL_thread.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "SDL_endian.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_events_c.h"
#include "SDL_x11video.h"
#include "SDL_x11wm_c.h"
#include "SDL_x11mouse_c.h"
#include "SDL_x11events_c.h"
#include "SDL_x11modes_c.h"
#include "SDL_x11image_c.h"
#include "SDL_x11yuv_c.h"
#include "SDL_x11gl_c.h"
#include "SDL_x11gamma_c.h"
#include "blank_cursor.h"

/* Initialization/Query functions */
static int X11_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Surface *X11_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int X11_ToggleFullScreen(_THIS, int on);
static void X11_UpdateMouse(_THIS);
static int X11_SetColors(_THIS, int firstcolor, int ncolors,
			 SDL_Color *colors);
static int X11_SetGammaRamp(_THIS, Uint16 *ramp);
static void X11_VideoQuit(_THIS);

/* X11 driver bootstrap functions */

static int X11_Available(void)
{
	Display *display;

	display = XOpenDisplay(NULL);
	if ( display != NULL ) {
		XCloseDisplay(display);
	}
	return(display != NULL);
}

static void X11_DeleteDevice(SDL_VideoDevice *device)
{
	if ( device ) {
		if ( device->hidden ) {
			free(device->hidden);
		}
		if ( device->gl_data ) {
			free(device->gl_data);
		}
		free(device);
	}
}

static SDL_VideoDevice *X11_CreateDevice(int devindex)
{
	SDL_VideoDevice *device;

	/* Initialize all variables that we clean on shutdown */
	device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
	if ( device ) {
		memset(device, 0, (sizeof *device));
		device->hidden = (struct SDL_PrivateVideoData *)
				malloc((sizeof *device->hidden));
		device->gl_data = (struct SDL_PrivateGLData *)
				malloc((sizeof *device->gl_data));
	}
	if ( (device == NULL) || (device->hidden == NULL) ||
	                         (device->gl_data == NULL) ) {
		SDL_OutOfMemory();
		X11_DeleteDevice(device);
		return(0);
	}
	memset(device->hidden, 0, (sizeof *device->hidden));
	memset(device->gl_data, 0, (sizeof *device->gl_data));

	/* Set the driver flags */
	device->handles_any_size = 1;

	/* Set the function pointers */
	device->VideoInit = X11_VideoInit;
	device->ListModes = X11_ListModes;
	device->SetVideoMode = X11_SetVideoMode;
	device->ToggleFullScreen = X11_ToggleFullScreen;
	device->UpdateMouse = X11_UpdateMouse;
#ifdef XFREE86_XV
	device->CreateYUVOverlay = X11_CreateYUVOverlay;
#endif
	device->SetColors = X11_SetColors;
	device->UpdateRects = NULL;
	device->VideoQuit = X11_VideoQuit;
	device->AllocHWSurface = X11_AllocHWSurface;
	device->CheckHWBlit = NULL;
	device->FillHWRect = NULL;
	device->SetHWColorKey = NULL;
	device->SetHWAlpha = NULL;
	device->LockHWSurface = X11_LockHWSurface;
	device->UnlockHWSurface = X11_UnlockHWSurface;
	device->FlipHWSurface = X11_FlipHWSurface;
	device->FreeHWSurface = X11_FreeHWSurface;
	device->SetGamma = X11_SetVidModeGamma;
	device->GetGamma = X11_GetVidModeGamma;
	device->SetGammaRamp = X11_SetGammaRamp;
	device->GetGammaRamp = NULL;
#ifdef HAVE_OPENGL
	device->GL_LoadLibrary = X11_GL_LoadLibrary;
	device->GL_GetProcAddress = X11_GL_GetProcAddress;
	device->GL_GetAttribute = X11_GL_GetAttribute;
	device->GL_MakeCurrent = X11_GL_MakeCurrent;
	device->GL_SwapBuffers = X11_GL_SwapBuffers;
#endif
	device->SetCaption = X11_SetCaption;
	device->SetIcon = X11_SetIcon;
	device->IconifyWindow = X11_IconifyWindow;
	device->GrabInput = X11_GrabInput;
	device->GetWMInfo = X11_GetWMInfo;
	device->FreeWMCursor = X11_FreeWMCursor;
	device->CreateWMCursor = X11_CreateWMCursor;
	device->ShowWMCursor = X11_ShowWMCursor;
	device->WarpWMCursor = X11_WarpWMCursor;
	device->CheckMouseMode = X11_CheckMouseMode;
	device->InitOSKeymap = X11_InitOSKeymap;
	device->PumpEvents = X11_PumpEvents;

	device->free = X11_DeleteDevice;

	return device;
}

VideoBootStrap X11_bootstrap = {
	"x11", "X Window System",
	X11_Available, X11_CreateDevice
};

/* Shared memory information */
extern int XShmQueryExtension(Display *dpy);	/* Not in X11 headers */

/* Normal X11 error handler routine */
static int (*X_handler)(Display *, XErrorEvent *) = NULL;
static int x_errhandler(Display *d, XErrorEvent *e)
{
#ifdef XFREE86_VM
	extern int vm_error;
#endif
#ifdef XFREE86_DGAMOUSE
	extern int dga_error;
#endif

#ifdef XFREE86_VM
	/* VidMode errors are non-fatal. :) */
	/* Are the errors offset by one from the error base?
	   e.g. the error base is 143, the code is 148, and the
	        actual error is XF86VidModeExtensionDisabled (4) ?
	 */
        if ( (vm_error >= 0) &&
	     (((e->error_code == BadRequest)&&(e->request_code == vm_error)) ||
	      ((e->error_code > vm_error) &&
	       (e->error_code <= (vm_error+XF86VidModeNumberErrors)))) ) {
#ifdef XFREE86_DEBUG
{ char errmsg[1024];
  XGetErrorText(d, e->error_code, errmsg, sizeof(errmsg));
printf("VidMode error: %s\n", errmsg);
}
#endif
        	return(0);
        }
#endif /* XFREE86_VM */

#ifdef XFREE86_DGAMOUSE
	/* DGA errors can be non-fatal. :) */
        if ( (dga_error >= 0) &&
	     ((e->error_code > dga_error) &&
	      (e->error_code <= (dga_error+XF86DGANumberErrors))) ) {
#ifdef XFREE86_DEBUG
{ char errmsg[1024];
  XGetErrorText(d, e->error_code, errmsg, sizeof(errmsg));
printf("DGA error: %s\n", errmsg);
}
#endif
        	return(0);
        }
#endif /* XFREE86_DGAMOUSE */

	return(X_handler(d,e));
}

/* X11 I/O error handler routine */
static int (*XIO_handler)(Display *) = NULL;
static int xio_errhandler(Display *d)
{
	/* Ack!  Lost X11 connection! */

	/* We will crash if we try to clean up our display */
	if ( current_video->hidden->Ximage ) {
		SDL_VideoSurface->pixels = NULL;
	}
	current_video->hidden->X11_Display = NULL;

	/* Continue with the standard X11 error handler */
	return(XIO_handler(d));
}

/* Create auxiliary (toplevel) windows with the current visual */
static void create_aux_windows(_THIS)
{
    XSetWindowAttributes xattr;
    XWMHints *hints;
    XTextProperty titleprop, iconprop;
    int def_vis = (SDL_Visual == DefaultVisual(SDL_Display, SDL_Screen));

    /* Don't create any extra windows if we are being managed */
    if ( SDL_windowid ) {
	FSwindow = 0;
	WMwindow = strtol(SDL_windowid, NULL, 0);
        return;
    }

    if(FSwindow)
	XDestroyWindow(SDL_Display, FSwindow);

    xattr.override_redirect = True;
    xattr.background_pixel = def_vis ? BlackPixel(SDL_Display, SDL_Screen) : 0;
    xattr.border_pixel = 0;
    xattr.colormap = SDL_XColorMap;

    FSwindow = XCreateWindow(SDL_Display, SDL_Root,
                             xinerama_x, xinerama_y, 32, 32, 0,
			     this->hidden->depth, InputOutput, SDL_Visual,
			     CWOverrideRedirect | CWBackPixel | CWBorderPixel
			     | CWColormap,
			     &xattr);

    XSelectInput(SDL_Display, FSwindow, StructureNotifyMask);

    /* Tell KDE to keep the fullscreen window on top */
    {
	XEvent ev;
	long mask;

	memset(&ev, 0, sizeof(ev));
	ev.xclient.type = ClientMessage;
	ev.xclient.window = SDL_Root;
	ev.xclient.message_type = XInternAtom(SDL_Display,
					      "KWM_KEEP_ON_TOP", False);
	ev.xclient.format = 32;
	ev.xclient.data.l[0] = FSwindow;
	ev.xclient.data.l[1] = CurrentTime;
	mask = SubstructureRedirectMask;
	XSendEvent(SDL_Display, SDL_Root, False, mask, &ev);
    }

    hints = NULL;
    titleprop.value = iconprop.value = NULL;
    if(WMwindow) {
	/* All window attributes must survive the recreation */
	hints = XGetWMHints(SDL_Display, WMwindow);
	XGetWMName(SDL_Display, WMwindow, &titleprop);
	XGetWMIconName(SDL_Display, WMwindow, &iconprop);
	XDestroyWindow(SDL_Display, WMwindow);
    }

    /* Create the window for windowed management */
    /* (reusing the xattr structure above) */
    WMwindow = XCreateWindow(SDL_Display, SDL_Root, 0, 0, 32, 32, 0,
			     this->hidden->depth, InputOutput, SDL_Visual,
			     CWBackPixel | CWBorderPixel | CWColormap,
			     &xattr);

    /* Set the input hints so we get keyboard input */
    if(!hints) {
	hints = XAllocWMHints();
	hints->input = True;
	hints->flags = InputHint;
    }
    XSetWMHints(SDL_Display, WMwindow, hints);
    XFree(hints);
    if(titleprop.value) {
	XSetWMName(SDL_Display, WMwindow, &titleprop);
	XFree(titleprop.value);
    }
    if(iconprop.value) {
	XSetWMIconName(SDL_Display, WMwindow, &iconprop);
	XFree(iconprop.value);
    }

    XSelectInput(SDL_Display, WMwindow,
		 FocusChangeMask | KeyPressMask | KeyReleaseMask
		 | PropertyChangeMask | StructureNotifyMask | KeymapStateMask);

    /* Set the class hints so we can get an icon (AfterStep) */
    {
	XClassHint *classhints;
	classhints = XAllocClassHint();
	if(classhints != NULL) {
            char *classname = getenv("SDL_VIDEO_X11_WMCLASS");
            if ( ! classname ) {
                classname = "SDL_App";
            }
	    classhints->res_name = classname;
	    classhints->res_class = classname;
	    XSetClassHint(SDL_Display, WMwindow, classhints);
	    XFree(classhints);
	}
    }

    /* Allow the window to be deleted by the window manager */
    WM_DELETE_WINDOW = XInternAtom(SDL_Display, "WM_DELETE_WINDOW", False);
    XSetWMProtocols(SDL_Display, WMwindow, &WM_DELETE_WINDOW, 1);
}

static int X11_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	char *display;
	int i;

	/* Open the X11 display */
	display = NULL;		/* Get it from DISPLAY environment variable */

	if ( (strncmp(XDisplayName(display), ":", 1) == 0) ||
	     (strncmp(XDisplayName(display), "unix:", 5) == 0) ) {
		local_X11 = 1;
	} else {
		local_X11 = 0;
	}
	SDL_Display = XOpenDisplay(display);
	if ( SDL_Display == NULL ) {
		SDL_SetError("Couldn't open X11 display");
		return(-1);
	}
#ifdef X11_DEBUG
	XSynchronize(SDL_Display, True);
#endif

	/* Create an alternate X display for graphics updates -- allows us
	   to do graphics updates in a separate thread from event handling.
	   Thread-safe X11 doesn't seem to exist.
	 */
	GFX_Display = XOpenDisplay(display);
	if ( GFX_Display == NULL ) {
		SDL_SetError("Couldn't open X11 display");
		return(-1);
	}

	/* Set the normal X error handler */
	X_handler = XSetErrorHandler(x_errhandler);

	/* Set the error handler if we lose the X display */
	XIO_handler = XSetIOErrorHandler(xio_errhandler);

	/* use default screen (from $DISPLAY) */
	SDL_Screen = DefaultScreen(SDL_Display);

	use_mitshm = 0;
#ifndef NO_SHARED_MEMORY
	/* Check for MIT shared memory extension */
	if ( local_X11 ) {
		use_mitshm = XShmQueryExtension(SDL_Display);
	}
#endif /* NO_SHARED_MEMORY */

	/* Get the available video modes */
	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;