[Xephyr/GL] properly route expose event on GL drawables

When an expose event happens on an host GL window paired with an
internal drawable, route that expose event to the clients listening
to the expose event on the internal drawable.

hw/kdrive/ephyr/ephyr.c

@@ -841,6 +841,37 @@ miPointerScreenFuncRec ephyrPointerScreenFuncs =
   ephyrWarpCursor
 };
 
+/**
+ * find if the remote window denoted by a_remote
+ * is paired with an internal Window within the Xephyr server.
+ * If the remove window is paired with an internal window, send an
+ * expose event to the client insterested in the internal window expose event.
+ *
+ * Pairing happens when a drawable inside Xephyr is associated with
+ * a GL surface in a DRI environment.
+ * Look at the function ProcXF86DRICreateDrawable in ephyrdriext.c to
+ * know a paired window is created.
+ *
+ * This is useful to make GL drawables (only windows for now) handle
+ * expose events and send those events to clients.
+ */
+static void
+ephyrExposePairedWindow (int a_remote)
+{
+    EphyrWindowPair *pair = NULL;
+    RegionRec reg;
+    ScreenPtr screen;
+
+    if (!findWindowPairFromRemote (a_remote, &pair)) {
+	EPHYR_LOG ("did not find a pair for this window\n");
+	return;
+    }
+    screen = pair->local->drawable.pScreen;
+    REGION_NULL (screen, &reg);
+    REGION_COPY (screen, &reg, &pair->local->clipList);
+    screen->WindowExposures (pair->local, &reg, NullRegion);
+    REGION_UNINIT (screen, &reg);
+}
 
 void
 ephyrPoll(void)
@@ -861,10 +892,14 @@ ephyrPoll(void)
             if (ephyrCurScreen != ev.data.mouse_motion.screen)
               {
                   EPHYR_LOG ("warping mouse cursor:%d\n", ephyrCurScreen) ;
-                  ephyrWarpCursor(screenInfo.screens[ev.data.mouse_motion.screen],
+                  if (ev.data.mouse_motion.screen >= 0)
+                    {
+                      ephyrWarpCursor
+                            (screenInfo.screens[ev.data.mouse_motion.screen],
                              ev.data.mouse_motion.x,
                              ev.data.mouse_motion.y );
                     }
+              }
             else
               {
                   EPHYR_LOG ("enqueuing mouse motion:%d\n", ephyrCurScreen) ;
@@ -913,6 +948,16 @@ ephyrPoll(void)
 	  KdEnqueueKeyboardEvent (ephyrKbd, ev.data.key_up.scancode, TRUE);
 	  break;
 
+	case EPHYR_EV_EXPOSE:
+	  /*
+	   * We only receive expose events when the expose event have
+	   * be generated for a drawable that is a host X window managed
+	   * by Xephyr. Host X windows managed by Xephyr exists for instance
+	   * when Xephyr is asked to create a GL drawable in a DRI environment.
+	   */
+	  ephyrExposePairedWindow (ev.data.expose.window);
+	  break;
+
 	default:
 	  break;
 	}

hw/kdrive/ephyr/ephyrdriext.c

@@ -59,10 +59,6 @@
 #define _HAVE_XALLOC_DECLS
 #include "ephyrlog.h"
 
-typedef struct {
-    WindowPtr local ;
-    int remote ;
-} EphyrWindowPair;
 
 typedef struct {
     int foo;
@@ -950,6 +946,26 @@ findWindowPairFromLocal (WindowPtr a_local,
     return FALSE ;
 }
 
+Bool
+findWindowPairFromRemote (int a_remote,
+                          EphyrWindowPair **a_pair)
+{
+    int i=0 ;
+
+    EPHYR_RETURN_VAL_IF_FAIL (a_pair, FALSE) ;
+
+    for (i=0; i < NUM_WINDOW_PAIRS; i++) {
+        if (window_pairs[i].remote == a_remote) {
+            *a_pair = &window_pairs[i] ;
+            EPHYR_LOG ("found (%p, %d)\n",
+                       (*a_pair)->local,
+                       (*a_pair)->remote) ;
+            return TRUE ;
+        }
+    }
+    return FALSE ;
+}
+
 static Bool
 createHostPeerWindow (const WindowPtr a_win,
                       int *a_peer_win)

hw/kdrive/ephyr/ephyrdriext.h

@@ -27,6 +27,16 @@
  */
 #ifndef __EPHYRDRIEXT_H__
 #define __EPHYRDRIEXT_H__
+
+typedef struct {
+    WindowPtr local ;
+    int remote ;
+} EphyrWindowPair;
+
 Bool ephyrDRIExtensionInit (ScreenPtr a_screen) ;
+
+Bool findWindowPairFromRemote (int a_remote,
+			       EphyrWindowPair **a_pair);
+
 #endif /*__EPHYRDRIEXT_H__*/
 

hw/kdrive/ephyr/hostx.c

@@ -839,16 +839,38 @@ hostx_load_keymap(void)
 static struct EphyrHostScreen *
 host_screen_from_window (Window w)
 {
-  int index;
+  int index = 0;
+  struct EphyrHostScreen *result  = NULL;
+#if 0
+  unsigned int num_children = 0;
+  Window root = None, parent = None, *children = NULL;
+#endif
 
   for (index = 0 ; index < HostX.n_screens ; index++)
     {
       if (HostX.screens[index].win == w)
         {
-          return &HostX.screens[index];
+          result = &HostX.screens[index];
+          goto out;
         }
     }
-  return NULL;
+#if 0
+  XQueryTree (hostx_get_display (), w, &root, &parent,
+              &children, &num_children);
+  if (parent == root || parent == None)
+      goto out;
+  result = host_screen_from_window (parent);
+#endif
+
+out:
+#if 0
+  if (children)
+      {
+        XFree (children);
+        children = NULL;
+      }
+#endif
+  return result;
 }
 
 int
@@ -870,10 +892,20 @@ hostx_get_event(EphyrHostXEvent *ev)
 	  {
 	    struct EphyrHostScreen *host_screen =
                 host_screen_from_window (xev.xexpose.window);
+            if (host_screen)
+              {
                 hostx_paint_rect (host_screen->info, 0, 0, 0, 0,
                                   host_screen->win_width,
                                   host_screen->win_height);
               }
+            else
+              {
+                EPHYR_LOG_ERROR ("failed to get host screen\n");
+                ev->type = EPHYR_EV_EXPOSE;
+                ev->data.expose.window = xev.xexpose.window;
+                return 1;
+              }
+	  }
 	  return 0;
 
 	case MotionNotify:
@@ -1113,12 +1145,18 @@ hostx_create_window (int a_screen_number,
                                                   visual_info->screen),
                                       visual_info->visual,
                                       AllocNone) ;
-    winmask = CWColormap;
+    attrs.event_mask = ButtonPressMask
+                       |ButtonReleaseMask
+                       |PointerMotionMask
+                       |KeyPressMask
+                       |KeyReleaseMask
+                       |ExposureMask;
+    winmask = CWColormap|CWEventMask;
 
     win = XCreateWindow (dpy, hostx_get_window (a_screen_number),
                          a_geometry->x, a_geometry->y,
                          a_geometry->width, a_geometry->height, 0,
-                         visual_info->depth, InputOutput,
+                         visual_info->depth, CopyFromParent,
                          visual_info->visual, winmask, &attrs) ;
     if (win == None) {
         EPHYR_LOG_ERROR ("failed to create peer window\n") ;

hw/kdrive/ephyr/hostx.h

@@ -47,7 +47,8 @@ typedef enum EphyrHostXEventType
   EPHYR_EV_MOUSE_PRESS,
   EPHYR_EV_MOUSE_RELEASE,
   EPHYR_EV_KEY_PRESS,
-  EPHYR_EV_KEY_RELEASE
+  EPHYR_EV_KEY_RELEASE,
+  EPHYR_EV_EXPOSE
 } 
 EphyrHostXEventType;
 
@@ -87,6 +88,10 @@ struct EphyrHostXEvent
       int scancode;
     } key_down;
 
+    struct expose {
+      int window;
+    } expose;
+
   } data;
 
   int key_state;