src/video/x11/SDL_x11video.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 28 Sep 2012 14:12:45 -0400
changeset 6498 93d9b2a2eb0e
parent 6484 b904bb684095
child 6569 1f4e69a8e5e6
permissions -rw-r--r--
Add a safety net X11 error handler, to reset the vidmodes before crashing.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_X11
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#include <unistd.h> /* For getpid() and readlink() */
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "SDL_x11video.h"
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#include "SDL_x11framebuffer.h"
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#include "SDL_x11shape.h"
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#include "SDL_x11touch.h" 
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#include "SDL_x11xinput2.h"
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#if SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
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#include "SDL_x11opengles.h"
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#endif
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/* Initialization/Query functions */
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static int X11_VideoInit(_THIS);
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static void X11_VideoQuit(_THIS);
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/* Find out what class name we should use */
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static char *
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get_classname()
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{
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    char *spot;
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#if defined(__LINUX__) || defined(__FREEBSD__)
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    char procfile[1024];
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    char linkfile[1024];
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    int linksize;
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#endif
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    /* First allow environment variable override */
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    spot = SDL_getenv("SDL_VIDEO_X11_WMCLASS");
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    if (spot) {
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        return SDL_strdup(spot);
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    }
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    /* Next look at the application's executable name */
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#if defined(__LINUX__) || defined(__FREEBSD__)
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#if defined(__LINUX__)
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    SDL_snprintf(procfile, SDL_arraysize(procfile), "/proc/%d/exe", getpid());
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#elif defined(__FREEBSD__)
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    SDL_snprintf(procfile, SDL_arraysize(procfile), "/proc/%d/file",
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                 getpid());
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#else
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#error Where can we find the executable name?
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#endif
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    linksize = readlink(procfile, linkfile, sizeof(linkfile) - 1);
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    if (linksize > 0) {
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        linkfile[linksize] = '\0';
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        spot = SDL_strrchr(linkfile, '/');
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        if (spot) {
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            return SDL_strdup(spot + 1);
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        } else {
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            return SDL_strdup(linkfile);
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        }
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    }
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#endif /* __LINUX__ || __FREEBSD__ */
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    /* Finally use the default we've used forever */
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    return SDL_strdup("SDL_App");
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}
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/* X11 driver bootstrap functions */
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static int
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X11_Available(void)
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{
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    Display *display = NULL;
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    if (SDL_X11_LoadSymbols()) {
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        display = XOpenDisplay(NULL);
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        if (display != NULL) {
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            XCloseDisplay(display);
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        }
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        SDL_X11_UnloadSymbols();
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    }
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    return (display != NULL);
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}
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static void
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X11_DeleteDevice(SDL_VideoDevice * device)
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{
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    SDL_VideoData *data = (SDL_VideoData *) device->driverdata;
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    if (data->display) {
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        XCloseDisplay(data->display);
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    }
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    SDL_free(data->windowlist);
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    SDL_free(device->driverdata);
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    SDL_free(device);
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    SDL_X11_UnloadSymbols();
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}
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/* An error handler to reset the vidmode and then call the default handler. */
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static SDL_bool safety_net_triggered = SDL_FALSE;
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static int (*orig_x11_errhandler) (Display *, XErrorEvent *) = NULL;
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static int
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X11_SafetyNetErrHandler(Display * d, XErrorEvent * e)
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{
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    /* if we trigger an error in our error handler, don't try again. */
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    if (!safety_net_triggered) {
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        safety_net_triggered = SDL_TRUE;
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        SDL_VideoDevice *device = SDL_GetVideoDevice();
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        if (device != NULL) {
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            int i;
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            for (i = 0; i < device->num_displays; i++) {
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                SDL_VideoDisplay *display = &device->displays[i];
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                if (SDL_memcmp(&display->current_mode, &display->desktop_mode,
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                               sizeof (SDL_DisplayMode)) != 0) {
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                    X11_SetDisplayMode(device, display, &display->desktop_mode);
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                }
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            }
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        }
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    }
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    if (orig_x11_errhandler != NULL) {
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        return orig_x11_errhandler(d, e);  /* probably terminate. */
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    }
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    return 0;
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}
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static SDL_VideoDevice *
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X11_CreateDevice(int devindex)
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{
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    SDL_VideoDevice *device;
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    SDL_VideoData *data;
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    const char *display = NULL; /* Use the DISPLAY environment variable */
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    if (!SDL_X11_LoadSymbols()) {
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        return NULL;
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    }
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    /* Initialize all variables that we clean on shutdown */
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    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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    if (!device) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    data = (struct SDL_VideoData *) SDL_calloc(1, sizeof(SDL_VideoData));
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    if (!data) {
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        SDL_OutOfMemory();
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        SDL_free(device);
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        return NULL;
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    }
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    device->driverdata = data;
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    /* FIXME: Do we need this?
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       if ( (SDL_strncmp(XDisplayName(display), ":", 1) == 0) ||
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       (SDL_strncmp(XDisplayName(display), "unix:", 5) == 0) ) {
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       local_X11 = 1;
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       } else {
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       local_X11 = 0;
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       }
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     */
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    data->display = XOpenDisplay(display);
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#if defined(__osf__) && defined(SDL_VIDEO_DRIVER_X11_DYNAMIC)
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    /* On Tru64 if linking without -lX11, it fails and you get following message.
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     * Xlib: connection to ":0.0" refused by server
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     * Xlib: XDM authorization key matches an existing client!
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     *
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     * It succeeds if retrying 1 second later
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     * or if running xhost +localhost on shell.
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     */
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    if (data->display == NULL) {
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        SDL_Delay(1000);
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        data->display = XOpenDisplay(display);
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    }
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#endif
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    if (data->display == NULL) {
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        SDL_free(device->driverdata);
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        SDL_free(device);
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        SDL_SetError("Couldn't open X11 display");
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        return NULL;
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    }
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#ifdef X11_DEBUG
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    XSynchronize(data->display, True);
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#endif
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    /* Hook up an X11 error handler to recover the desktop resolution. */
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    safety_net_triggered = SDL_FALSE;
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    orig_x11_errhandler = XSetErrorHandler(X11_SafetyNetErrHandler);
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    /* Set the function pointers */
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    device->VideoInit = X11_VideoInit;
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    device->VideoQuit = X11_VideoQuit;
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    device->GetDisplayModes = X11_GetDisplayModes;
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    device->GetDisplayBounds = X11_GetDisplayBounds;
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    device->SetDisplayMode = X11_SetDisplayMode;
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    device->SuspendScreenSaver = X11_SuspendScreenSaver;
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    device->PumpEvents = X11_PumpEvents;
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    device->CreateWindow = X11_CreateWindow;
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    device->CreateWindowFrom = X11_CreateWindowFrom;
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    device->SetWindowTitle = X11_SetWindowTitle;
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    device->SetWindowIcon = X11_SetWindowIcon;
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    device->SetWindowPosition = X11_SetWindowPosition;
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    device->SetWindowSize = X11_SetWindowSize;
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    device->ShowWindow = X11_ShowWindow;
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    device->HideWindow = X11_HideWindow;
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    device->RaiseWindow = X11_RaiseWindow;
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    device->MaximizeWindow = X11_MaximizeWindow;
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    device->MinimizeWindow = X11_MinimizeWindow;
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    device->RestoreWindow = X11_RestoreWindow;
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    device->SetWindowBordered = X11_SetWindowBordered;
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    device->SetWindowFullscreen = X11_SetWindowFullscreen;
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    device->SetWindowGammaRamp = X11_SetWindowGammaRamp;
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    device->SetWindowGrab = X11_SetWindowGrab;
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    device->DestroyWindow = X11_DestroyWindow;
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    device->CreateWindowFramebuffer = X11_CreateWindowFramebuffer;
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    device->UpdateWindowFramebuffer = X11_UpdateWindowFramebuffer;
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    device->DestroyWindowFramebuffer = X11_DestroyWindowFramebuffer;
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    device->GetWindowWMInfo = X11_GetWindowWMInfo;
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    device->shape_driver.CreateShaper = X11_CreateShaper;
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    device->shape_driver.SetWindowShape = X11_SetWindowShape;
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    device->shape_driver.ResizeWindowShape = X11_ResizeWindowShape;
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#if SDL_VIDEO_OPENGL_GLX
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    device->GL_LoadLibrary = X11_GL_LoadLibrary;
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    device->GL_GetProcAddress = X11_GL_GetProcAddress;
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    device->GL_UnloadLibrary = X11_GL_UnloadLibrary;
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    device->GL_CreateContext = X11_GL_CreateContext;
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    device->GL_MakeCurrent = X11_GL_MakeCurrent;
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    device->GL_SetSwapInterval = X11_GL_SetSwapInterval;
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    device->GL_GetSwapInterval = X11_GL_GetSwapInterval;
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    device->GL_SwapWindow = X11_GL_SwapWindow;
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    device->GL_DeleteContext = X11_GL_DeleteContext;
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#elif SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
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    device->GL_LoadLibrary = X11_GLES_LoadLibrary;
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    device->GL_GetProcAddress = X11_GLES_GetProcAddress;
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    device->GL_UnloadLibrary = X11_GLES_UnloadLibrary;
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    device->GL_CreateContext = X11_GLES_CreateContext;
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    device->GL_MakeCurrent = X11_GLES_MakeCurrent;
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    device->GL_SetSwapInterval = X11_GLES_SetSwapInterval;
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    device->GL_GetSwapInterval = X11_GLES_GetSwapInterval;
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    device->GL_SwapWindow = X11_GLES_SwapWindow;
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    device->GL_DeleteContext = X11_GLES_DeleteContext;
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#endif
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    device->SetClipboardText = X11_SetClipboardText;
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    device->GetClipboardText = X11_GetClipboardText;
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    device->HasClipboardText = X11_HasClipboardText;
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    device->free = X11_DeleteDevice;
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    return device;
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}
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VideoBootStrap X11_bootstrap = {
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    "x11", "SDL X11 video driver",
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    X11_Available, X11_CreateDevice
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};
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static int (*handler) (Display *, XErrorEvent *) = NULL;
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static int
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X11_CheckWindowManagerErrorHandler(Display * d, XErrorEvent * e)
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{
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    if (e->error_code == BadWindow) {
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        return (0);
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    } else {
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        return (handler(d, e));
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    }
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}
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static void
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X11_CheckWindowManager(_THIS)
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{
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    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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    Display *display = data->display;
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    Atom _NET_SUPPORTING_WM_CHECK;
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    int status, real_format;
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    Atom real_type;
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    unsigned long items_read, items_left;
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    unsigned char *propdata;
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    Window wm_window = 0;
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#ifdef DEBUG_WINDOW_MANAGER
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    char *wm_name;
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#endif
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    /* Set up a handler to gracefully catch errors */
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    XSync(display, False);
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    handler = XSetErrorHandler(X11_CheckWindowManagerErrorHandler);
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    _NET_SUPPORTING_WM_CHECK = XInternAtom(display, "_NET_SUPPORTING_WM_CHECK", False);
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    status = XGetWindowProperty(display, DefaultRootWindow(display), _NET_SUPPORTING_WM_CHECK, 0L, 1L, False, XA_WINDOW, &real_type, &real_format, &items_read, &items_left, &propdata);
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    if (status == Success && items_read) {
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        wm_window = ((Window*)propdata)[0];
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    }
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    if (propdata) {
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        XFree(propdata);
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    }
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    if (wm_window) {
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        status = XGetWindowProperty(display, wm_window, _NET_SUPPORTING_WM_CHECK, 0L, 1L, False, XA_WINDOW, &real_type, &real_format, &items_read, &items_left, &propdata);
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        if (status != Success || !items_read || wm_window != ((Window*)propdata)[0]) {
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            wm_window = None;
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        }
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        if (propdata) {
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            XFree(propdata);
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        }
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    }
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    /* Reset the error handler, we're done checking */
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    XSync(display, False);
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    XSetErrorHandler(handler);
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    if (!wm_window) {
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#ifdef DEBUG_WINDOW_MANAGER
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        printf("Couldn't get _NET_SUPPORTING_WM_CHECK property\n");
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#endif
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        return;
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    }
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    data->net_wm = SDL_TRUE;
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#ifdef DEBUG_WINDOW_MANAGER
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    wm_name = X11_GetWindowTitle(_this, wm_window);
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    printf("Window manager: %s\n", wm_name);
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    SDL_free(wm_name);
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#endif
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}
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int
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X11_VideoInit(_THIS)
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{
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    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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    /* Get the window class name, usually the name of the application */
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    data->classname = get_classname();
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    /* Get the process PID to be associated to the window */
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    data->pid = getpid();
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    /* Open a connection to the X input manager */
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   360
#ifdef X_HAVE_UTF8_STRING
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   361
    if (SDL_X11_HAVE_UTF8) {
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   362
        data->im =
slouken@1951
   363
            XOpenIM(data->display, NULL, data->classname, data->classname);
slouken@1951
   364
    }
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   365
#endif
slouken@1951
   366
slouken@1951
   367
    /* Look up some useful Atoms */
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   368
#define GET_ATOM(X) data->X = XInternAtom(data->display, #X, False)
slouken@4518
   369
    GET_ATOM(WM_DELETE_WINDOW);
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   370
    GET_ATOM(_NET_WM_STATE);
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   371
    GET_ATOM(_NET_WM_STATE_HIDDEN);
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   372
    GET_ATOM(_NET_WM_STATE_FOCUSED);
slouken@4518
   373
    GET_ATOM(_NET_WM_STATE_MAXIMIZED_VERT);
slouken@4518
   374
    GET_ATOM(_NET_WM_STATE_MAXIMIZED_HORZ);
slouken@4518
   375
    GET_ATOM(_NET_WM_STATE_FULLSCREEN);
icculus@6466
   376
    GET_ATOM(_NET_WM_ALLOWED_ACTIONS);
icculus@6466
   377
    GET_ATOM(_NET_WM_ACTION_FULLSCREEN);
slouken@4518
   378
    GET_ATOM(_NET_WM_NAME);
slouken@4518
   379
    GET_ATOM(_NET_WM_ICON_NAME);
slouken@4518
   380
    GET_ATOM(_NET_WM_ICON);
slouken@4518
   381
    GET_ATOM(UTF8_STRING);
slouken@4518
   382
slouken@4518
   383
    /* Detect the window manager */
slouken@4518
   384
    X11_CheckWindowManager(_this);
slouken@1951
   385
slouken@3521
   386
    if (X11_InitModes(_this) < 0) {
slouken@3521
   387
        return -1;
slouken@3521
   388
    }
slouken@1950
   389
dimitris@6316
   390
    X11_InitXinput2(_this);
slouken@6311
   391
bob@2295
   392
    if (X11_InitKeyboard(_this) != 0) {
bob@2295
   393
        return -1;
bob@2295
   394
    }
slouken@1950
   395
    X11_InitMouse(_this);
slouken@1950
   396
jim@4645
   397
    X11_InitTouch(_this);
slouken@1950
   398
    return 0;
slouken@1950
   399
}
slouken@1950
   400
slouken@1950
   401
void
slouken@1950
   402
X11_VideoQuit(_THIS)
slouken@1950
   403
{
slouken@1951
   404
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
slouken@1951
   405
slouken@1951
   406
    if (data->classname) {
slouken@1951
   407
        SDL_free(data->classname);
slouken@1951
   408
    }
slouken@1951
   409
#ifdef X_HAVE_UTF8_STRING
slouken@1951
   410
    if (data->im) {
slouken@1951
   411
        XCloseIM(data->im);
slouken@1951
   412
    }
slouken@1951
   413
#endif
slouken@1951
   414
slouken@1950
   415
    X11_QuitModes(_this);
slouken@1950
   416
    X11_QuitKeyboard(_this);
slouken@1950
   417
    X11_QuitMouse(_this);
jim@4645
   418
    X11_QuitTouch(_this);
slouken@1950
   419
}
slouken@1950
   420
slouken@5466
   421
SDL_bool
slouken@5466
   422
X11_UseDirectColorVisuals(void)
slouken@5466
   423
{
slouken@5466
   424
    return SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ? SDL_FALSE : SDL_TRUE;
slouken@5466
   425
}
slouken@5466
   426
slouken@5481
   427
#endif /* SDL_VIDEO_DRIVER_X11 */
slouken@5481
   428
slouken@1950
   429
/* vim: set ts=4 sw=4 expandtab: */