Lots of prep for the "real" way to support fullscreen mode on modern window managers.

Unfortunately, this doesn't work.  I also noticed that maximizing doesn't work as well.  Also xprop hangs when trying to list properties of SDL windows.... ???

src/video/x11/SDL_x11events.c

@@ -34,18 +34,19 @@
 #include "SDL_timer.h"
 #include "SDL_syswm.h"
 
-/*#define DEBUG_XEVENTS*/
+#define DEBUG_XEVENTS
 
 static void
 X11_DispatchEvent(_THIS)
 {
     SDL_VideoData *videodata = (SDL_VideoData *) _this->driverdata;
+    Display *display = videodata->display;
     SDL_WindowData *data;
     XEvent xevent;
     int i;
 
     SDL_zero(xevent);           /* valgrind fix. --ryan. */
-    XNextEvent(videodata->display, &xevent);
+    XNextEvent(display, &xevent);
 
     /* filter events catchs XIM events and sends them to the correct
        handler */
@@ -80,6 +81,7 @@ X11_DispatchEvent(_THIS)
     if (!data) {
         return;
     }
+
 #if 0
     printf("type = %d display = %d window = %d\n",
            xevent.type, xevent.xany.display, xevent.xany.window);
@@ -182,9 +184,8 @@ X11_DispatchEvent(_THIS)
 #if 0
             if (videodata->key_layout[keycode] == SDLK_UNKNOWN) {
                 int min_keycode, max_keycode;
-                XDisplayKeycodes(videodata->display, &min_keycode,
-                                 &max_keycode);
-                keysym = XKeycodeToKeysym(videodata->display, keycode, 0);
+                XDisplayKeycodes(display, &min_keycode, &max_keycode);
+                keysym = XKeycodeToKeysym(display, keycode, 0);
                 fprintf(stderr,
                         "The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL mailing list <sdl@libsdl.org> X11 KeyCode %d (%d), X11 KeySym 0x%X (%s).\n",
                         keycode, keycode - min_keycode, keysym,
@@ -289,9 +290,58 @@ X11_DispatchEvent(_THIS)
         }
         break;
 
+    case PropertyNotify:{
+#ifdef DEBUG_XEVENTS
+            char *name = XGetAtomName(display, xevent.xproperty.atom);
+            printf("PropertyNotify (atom = %s)\n", name ? name : "NULL");
+            if (name) {
+                XFree(name);
+            }
+#endif
+            if (xevent.xproperty.atom == videodata->_NET_WM_STATE) {
+                unsigned char *propdata;
+                int status, real_format;
+                Atom real_type;
+                unsigned long items_read, items_left, i;
+
+#ifdef DEBUG_XEVENTS
+                printf("_NET_WM_STATE: {");
+#endif
+                status = XGetWindowProperty(display, data->xwindow, videodata->_NET_WM_STATE, 0L, 8192L, False, XA_ATOM, &real_type, &real_format, &items_read, &items_left, &propdata);
+                if (status == Success) {
+                    Atom *atoms = (Atom *)propdata;
+                    for (i = 0; i < items_read; i++) {
+                        if (atoms[i] == videodata->_NET_WM_STATE_HIDDEN) {
+#ifdef DEBUG_XEVENTS
+                            printf(" _NET_WM_STATE_HIDDEN");
+#endif
+                        }
+                        if (atoms[i] == videodata->_NET_WM_STATE_MAXIMIZED_HORZ) {
+#ifdef DEBUG_XEVENTS
+                            printf(" _NET_WM_STATE_MAXIMIZED_HORZ");
+#endif
+                        }
+                        if (atoms[i] == videodata->_NET_WM_STATE_MAXIMIZED_VERT) {
+#ifdef DEBUG_XEVENTS
+                            printf(" _NET_WM_STATE_MAXIMIZED_VERT");
+#endif
+                        }
+                        if (atoms[i] == videodata->_NET_WM_STATE_FULLSCREEN) {
+#ifdef DEBUG_XEVENTS
+                            printf(" _NET_WM_STATE_FULLSCREEN");
+#endif
+                        }
+                    }
+                }
+#ifdef DEBUG_XEVENTS
+                printf(" }\n");
+#endif
+            }
+        }
+        break;
+
     /* Copy the selection from XA_CUT_BUFFER0 to the requested property */
     case SelectionRequest: {
-            Display *display = videodata->display;
             XSelectionRequestEvent *req;
             XEvent sevent;
             int seln_format;

src/video/x11/SDL_x11modes.c

@@ -23,7 +23,7 @@
 
 #include "SDL_x11video.h"
 
-//#define X11MODES_DEBUG
+#define X11MODES_DEBUG
 #undef SDL_VIDEO_DRIVER_X11_XINERAMA
 #undef SDL_VIDEO_DRIVER_X11_XRANDR
 #undef SDL_VIDEO_DRIVER_X11_VIDMODE
@@ -253,6 +253,7 @@ CheckVidMode(Display * display, int *major, int *minor)
     return SDL_TRUE;
 }
 
+static
 Bool SDL_NAME(XF86VidModeGetModeInfo) (Display * dpy, int scr,
                                        SDL_NAME(XF86VidModeModeInfo) * info)
 {
@@ -296,6 +297,7 @@ save_mode(Display * display, SDL_DisplayData * data)
                                       &data->saved_view.y);
 }
 
+/*
 static void
 restore_mode(Display * display, SDL_DisplayData * data)
 {
@@ -313,6 +315,7 @@ restore_mode(Display * display, SDL_DisplayData * data)
                                           data->saved_view.y);
     }
 }
+*/
 #endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */
 
 void

src/video/x11/SDL_x11sym.h

@@ -67,12 +67,14 @@ SDL_X11_SYM(int,XFreeCursor,(Display* a,Cursor b),(a,b),return)
 SDL_X11_SYM(int,XFreeGC,(Display* a,GC b),(a,b),return)
 SDL_X11_SYM(int,XFreeModifiermap,(XModifierKeymap* a),(a),return)
 SDL_X11_SYM(int,XFreePixmap,(Display* a,Pixmap b),(a,b),return)
+SDL_X11_SYM(char*,XGetAtomName,(Display *a,Atom b),(a,b),return)
 SDL_X11_SYM(int,XGetErrorDatabaseText,(Display* a,_Xconst char* b,_Xconst char* c,_Xconst char* d,char* e,int f),(a,b,c,d,e,f),return)
 SDL_X11_SYM(XImage*,XGetImage,(Display* a,Drawable b,int c,int d,unsigned int e,unsigned int f,unsigned long g, int h),(a,b,c,d,e,f,g,h),return)
 SDL_X11_SYM(XModifierKeymap*,XGetModifierMapping,(Display* a),(a),return)
 SDL_X11_SYM(int,XGetPointerControl,(Display* a,int* b,int* c,int* d),(a,b,c,d),return)
 SDL_X11_SYM(int,XGetRGBColormaps,(Display* a,Window b,XStandardColormap **c,int *d,Atom e),(a,b,c,d,e),return)
 SDL_X11_SYM(Window,XGetSelectionOwner,(Display* a,Atom b),(a,b),return)
+SDL_X11_SYM(Status,XGetTextProperty,(Display *a,Window b,XTextProperty *c,Atom d),(a,b,c,d),return)
 SDL_X11_SYM(XVisualInfo*,XGetVisualInfo,(Display* a,long b,XVisualInfo* c,int* d),(a,b,c,d),return)
 SDL_X11_SYM(Status,XGetWindowAttributes,(Display* a,Window b,XWindowAttributes* c),(a,b,c),return)
 SDL_X11_SYM(int,XGetWindowProperty,(Display* a,Window b,Atom c,long d,long e,Bool f,Atom g,Atom* h,int* i,unsigned long* j,unsigned long *k,unsigned char **l),(a,b,c,d,e,f,g,h,i,j,k,l),return)

src/video/x11/SDL_x11video.c

@@ -242,6 +242,43 @@ VideoBootStrap X11_bootstrap = {
 };
 
 
+static void
+X11_CheckWindowManager(_THIS)
+{
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+    Display *display = data->display;
+    Atom _NET_SUPPORTING_WM_CHECK;
+    int status, real_format;
+    Atom real_type;
+    unsigned long items_read, items_left;
+    unsigned char *propdata;
+    Window wm_window = 0;
+#ifdef DEBUG_WINDOW_MANAGER
+    char *wm_name;
+#endif
+
+    _NET_SUPPORTING_WM_CHECK = XInternAtom(display, "_NET_SUPPORTING_WM_CHECK", False);
+    status = XGetWindowProperty(display, DefaultRootWindow(display), _NET_SUPPORTING_WM_CHECK, 0L, 1L, False, XA_WINDOW, &real_type, &real_format, &items_read, &items_left, &propdata);
+    if (status == Success && items_read) {
+        wm_window = ((Window*)propdata)[0];
+    }
+    XFree(propdata);
+
+    if (!wm_window) {
+#ifdef DEBUG_WINDOW_MANAGER
+        printf("Couldn't get _NET_SUPPORTING_WM_CHECK property\n");
+#endif
+        return;
+    }
+    data->net_wm = SDL_TRUE;
+
+#ifdef DEBUG_WINDOW_MANAGER
+    wm_name = X11_GetWindowTitle(_this, wm_window);
+    printf("Window manager: %s\n", wm_name);
+    SDL_free(wm_name);
+#endif
+}
+
 int
 X11_VideoInit(_THIS)
 {
@@ -259,8 +296,20 @@ X11_VideoInit(_THIS)
 #endif
 
     /* Look up some useful Atoms */
-    data->WM_DELETE_WINDOW =
-        XInternAtom(data->display, "WM_DELETE_WINDOW", False);
+#define GET_ATOM(X) data->X = XInternAtom(data->display, #X, False)
+    GET_ATOM(WM_DELETE_WINDOW);
+    GET_ATOM(_NET_WM_STATE);
+    GET_ATOM(_NET_WM_STATE_HIDDEN);
+    GET_ATOM(_NET_WM_STATE_MAXIMIZED_VERT);
+    GET_ATOM(_NET_WM_STATE_MAXIMIZED_HORZ);
+    GET_ATOM(_NET_WM_STATE_FULLSCREEN);
+    GET_ATOM(_NET_WM_NAME);
+    GET_ATOM(_NET_WM_ICON_NAME);
+    GET_ATOM(_NET_WM_ICON);
+    GET_ATOM(UTF8_STRING);
+
+    /* Detect the window manager */
+    X11_CheckWindowManager(_this);
 
     if (X11_InitModes(_this) < 0) {
         return -1;

src/video/x11/SDL_x11video.h

@@ -68,7 +68,22 @@ typedef struct SDL_VideoData
     int numwindows;
     SDL_WindowData **windowlist;
     int windowlistlength;
+
+    /* This is true for ICCCM2.0-compliant window managers */
+    SDL_bool net_wm;
+
+    /* Useful atoms */
     Atom WM_DELETE_WINDOW;
+    Atom _NET_WM_STATE;
+    Atom _NET_WM_STATE_HIDDEN;
+    Atom _NET_WM_STATE_MAXIMIZED_VERT;
+    Atom _NET_WM_STATE_MAXIMIZED_HORZ;
+    Atom _NET_WM_STATE_FULLSCREEN;
+    Atom _NET_WM_NAME;
+    Atom _NET_WM_ICON_NAME;
+    Atom _NET_WM_ICON;
+    Atom UTF8_STRING;
+
     SDL_scancode key_layout[256];
     SDL_bool selection_waiting;
 } SDL_VideoData;

src/video/x11/SDL_x11window.h

@@ -35,6 +35,7 @@ typedef struct
 
 extern int X11_CreateWindow(_THIS, SDL_Window * window);
 extern int X11_CreateWindowFrom(_THIS, SDL_Window * window, const void *data);
+extern char *X11_GetWindowTitle(_THIS, Window xwindow);
 extern void X11_SetWindowTitle(_THIS, SDL_Window * window);
 extern void X11_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon);
 extern void X11_SetWindowPosition(_THIS, SDL_Window * window);