[gtk+/broadway: 11/71] Track last_surface properly

[Alexander Larsson <alexl src gnome org>]

commit 60cf2d53eb15904b790ab760d8b2265ff57333e2
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Nov 16 13:09:37 2010 +0100

    Track last_surface properly

 gdk/broadway/gdkwindow-broadway.c |  108 ++++++++++++++++++++++++++++++++----
 gdk/broadway/gdkwindow-broadway.h |    2 +-
 2 files changed, 97 insertions(+), 13 deletions(-)
---
diff --git a/gdk/broadway/gdkwindow-broadway.c b/gdk/broadway/gdkwindow-broadway.c
index 994f1ba..f809570 100644
--- a/gdk/broadway/gdkwindow-broadway.c
+++ b/gdk/broadway/gdkwindow-broadway.c
@@ -993,6 +993,101 @@ _gdk_windowing_window_set_composited (GdkWindow *window,
 {
 }
 
+
+static guint dirty_flush_id = 0;
+
+static void
+diff_surfaces (cairo_surface_t *surface,
+	       cairo_surface_t *old_surface)
+{
+  guint8 *data, *old_data;
+  guint8 *line, *old_line;
+  int w, h, stride, old_stride;
+  int x, y;
+
+  data = cairo_image_surface_get_data (surface);
+  old_data = cairo_image_surface_get_data (old_surface);
+
+  w = cairo_image_surface_get_width (surface);
+  h = cairo_image_surface_get_height (surface);
+
+  stride = cairo_image_surface_get_stride (surface);
+  old_stride = cairo_image_surface_get_stride (old_surface);
+
+  for (y = 0; y < h; y++)
+    {
+      line = data;
+      old_line = old_data;
+
+      for (x = 0; x < w; x++)
+	{
+	  int j;
+	  for (j = 0; j < 4; j++)
+	    old_line[j] = line[j] - old_line[j];
+	  line += 4;
+	  old_line += 4;
+	}
+
+      data += stride;
+      old_data += old_stride;
+    }
+}
+
+static gboolean
+dirty_flush_idle (gpointer data)
+{
+  GList *l;
+
+  dirty_flush_id = 0;
+
+  for (l = all_windows; l != NULL; l = l->next)
+    {
+      GdkWindowImplBroadway *impl = l->data;
+      GdkDrawableImplBroadway *drawable_impl = GDK_DRAWABLE_IMPL_BROADWAY (impl);
+      cairo_t *cr;
+
+      if (impl->dirty)
+	{
+	  impl->dirty = FALSE;
+
+	  if (impl->last_synced)
+	    {
+	      diff_surfaces (drawable_impl->surface,
+			     drawable_impl->last_surface);
+	    }
+
+	  /* TODO: send data */
+
+	  if (1)
+	    {
+	      static int nr = 0;
+	      char *filename;
+	      filename = g_strdup_printf ("frame-%d.png", nr++);
+	      g_print ("writing window %p surface %p, name %s\n", drawable_impl->wrapper, drawable_impl->surface, filename);
+	      cairo_surface_write_to_png (drawable_impl->surface, filename);
+	      g_free (filename);
+	      filename = g_strdup_printf ("frame-%d-old.png", nr++);
+	      g_print ("writing window %p surface %p, name %s\n", drawable_impl->wrapper, drawable_impl->last_surface, filename);
+	      cairo_surface_write_to_png (drawable_impl->last_surface, filename);
+	      g_free (filename);
+	    }
+
+	  cr = cairo_create (drawable_impl->last_surface);
+	  cairo_set_source_surface (cr, drawable_impl->surface, 0, 0);
+	  cairo_paint (cr);
+	  cairo_destroy (cr);
+	  impl->last_synced = TRUE;
+	}
+    }
+  return FALSE;}
+
+static void
+queue_dirty_flush (void)
+{
+  if (dirty_flush_id == 0)
+    dirty_flush_id = gdk_threads_add_idle (dirty_flush_idle, NULL);
+}
+
 void
 _gdk_windowing_window_process_updates_recurse (GdkWindow *window,
                                                cairo_region_t *region)
@@ -1005,6 +1100,7 @@ _gdk_windowing_window_process_updates_recurse (GdkWindow *window,
   private = (GdkWindowObject *)window;
   impl = GDK_WINDOW_IMPL_BROADWAY (private->impl);
   impl->dirty = TRUE;
+  queue_dirty_flush ();
 }
 
 void
@@ -1015,18 +1111,6 @@ _gdk_windowing_before_process_all_updates (void)
 void
 _gdk_windowing_after_process_all_updates (void)
 {
-  GList *l;
-
-  for (l = all_windows; l != NULL; l = l->next)
-    {
-      GdkWindowImplBroadway *impl = l->data;
-
-      if (impl->dirty)
-	{
-	  /* TODO: Flush dirty windows */
-	  impl->dirty = FALSE;
-	}
-    }
 }
 
 gboolean
diff --git a/gdk/broadway/gdkwindow-broadway.h b/gdk/broadway/gdkwindow-broadway.h
index 78faf15..0871f29 100644
--- a/gdk/broadway/gdkwindow-broadway.h
+++ b/gdk/broadway/gdkwindow-broadway.h
@@ -54,7 +54,7 @@ struct _GdkWindowImplBroadway
 
   gint8 toplevel_window_type;
   gboolean dirty;
-
+  gboolean last_synced;
 };
 
 struct _GdkWindowImplBroadwayClass