[metacity] compositor-xrender: move Expose event handling to MetaCompositor

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 3eb4d02b01cc70be31248cc3b013a5e6eb259a87
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Oct 20 20:42:14 2019 +0300

    compositor-xrender: move Expose event handling to MetaCompositor

 src/compositor/meta-compositor-xrender.c | 68 --------------------------------
 src/compositor/meta-compositor.c         | 34 +++++++++++++++-
 2 files changed, 33 insertions(+), 69 deletions(-)
---
diff --git a/src/compositor/meta-compositor-xrender.c b/src/compositor/meta-compositor-xrender.c
index f76f86ab..841541ba 100644
--- a/src/compositor/meta-compositor-xrender.c
+++ b/src/compositor/meta-compositor-xrender.c
@@ -578,35 +578,6 @@ shadow_picture (MetaCompositorXRender *xrender,
   return shadow_picture;
 }
 
-static MetaCompWindow *
-find_comp_window_by_xwindow (MetaCompositorXRender *xrender,
-                             Window                 xwindow)
-{
-  GHashTableIter iter;
-  MetaCompWindow *cw;
-
-  g_hash_table_iter_init (&iter, xrender->windows_by_xid);
-  while (g_hash_table_iter_next (&iter, NULL, (gpointer) &cw))
-    {
-      MetaFrame *frame;
-
-      frame = meta_window_get_frame (cw->window);
-
-      if (frame)
-        {
-          if (meta_frame_get_xwindow (frame) == xwindow)
-            return cw;
-        }
-      else
-        {
-          if (meta_window_get_xwindow (cw->window) == xwindow)
-            return cw;
-        }
-    }
-
-  return NULL;
-}
-
 static Picture
 solid_picture (Display  *xdisplay,
                gboolean  argb,
@@ -1177,41 +1148,6 @@ process_property_notify (MetaCompositorXRender *xrender,
     }
 }
 
-static void
-expose_area (MetaCompositorXRender *xrender,
-             XRectangle            *rects,
-             int                    nrects)
-{
-  XserverRegion region;
-
-  region = XFixesCreateRegion (xrender->xdisplay, rects, nrects);
-
-  meta_compositor_add_damage (META_COMPOSITOR (xrender), "expose_area", region);
-  XFixesDestroyRegion (xrender->xdisplay, region);
-}
-
-static void
-process_expose (MetaCompositorXRender *xrender,
-                XExposeEvent          *event)
-{
-  MetaCompWindow *cw = find_comp_window_by_xwindow (xrender, event->window);
-  XRectangle rect[1];
-  int origin_x = 0, origin_y = 0;
-
-  if (cw != NULL)
-    {
-      origin_x = cw->rect.x;
-      origin_y = cw->rect.y;
-    }
-
-  rect[0].x = event->x + origin_x;
-  rect[0].y = event->y + origin_y;
-  rect[0].width = event->width;
-  rect[0].height = event->height;
-
-  expose_area (xrender, rect, 1);
-}
-
 static int
 timeout_debug (MetaCompositorXRender *compositor)
 {
@@ -1488,10 +1424,6 @@ meta_compositor_xrender_process_event (MetaCompositor *compositor,
       process_property_notify (xrender, (XPropertyEvent *) event);
       break;
 
-    case Expose:
-      process_expose (xrender, (XExposeEvent *) event);
-      break;
-
     default:
       break;
     }
diff --git a/src/compositor/meta-compositor.c b/src/compositor/meta-compositor.c
index 9dc466fe..41324961 100644
--- a/src/compositor/meta-compositor.c
+++ b/src/compositor/meta-compositor.c
@@ -542,13 +542,45 @@ meta_compositor_process_event (MetaCompositor *compositor,
 {
   MetaCompositorPrivate *priv;
   MetaCompositorClass *compositor_class;
+  int damage_event_base;
 
   priv = meta_compositor_get_instance_private (compositor);
 
   compositor_class = META_COMPOSITOR_GET_CLASS (compositor);
   compositor_class->process_event (compositor, event, window);
 
-  if (event->type == meta_display_get_damage_event_base (priv->display) + XDamageNotify)
+  damage_event_base = meta_display_get_damage_event_base (priv->display);
+
+  if (event->type == Expose)
+    {
+      XExposeEvent *expose_event;
+      MetaSurface *surface;
+      XRectangle rect;
+      XserverRegion region;
+
+      expose_event = (XExposeEvent *) event;
+
+      if (window != NULL)
+        surface = g_hash_table_lookup (priv->surfaces, window);
+      else
+        surface = find_surface_by_xwindow (compositor, expose_event->window);
+
+      rect.x = expose_event->x;
+      rect.y = expose_event->y;
+      rect.width = expose_event->width;
+      rect.height = expose_event->height;
+
+      if (surface != NULL)
+        {
+          rect.x += meta_surface_get_x (surface);
+          rect.y += meta_surface_get_y (surface);
+        }
+
+      region = XFixesCreateRegion (priv->display->xdisplay, &rect, 1);
+      meta_compositor_add_damage (compositor, "XExposeEvent", region);
+      XFixesDestroyRegion (priv->display->xdisplay, region);
+    }
+  else if (event->type == damage_event_base + XDamageNotify)
     {
       XDamageNotifyEvent *damage_event;
       MetaSurface *surface;