glcontext: Store the buffer age regions in the GL context

That way, we can store the right region there: The actual painted area
instead of the exposed area (which is way too small).

Also, the GL context is the only user of this data, so storing it there
seems way smarter.

1 files changed, 27 insertions, 0 deletions

diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index b3703eef34..07f25aadfb 100644
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -134,12 +134,25 @@ G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkGLContext, gdk_gl_context, GDK_TYPE_DRAW
 static GPrivate thread_current_context = G_PRIVATE_INIT (g_object_unref);
 
 static void
+gdk_gl_context_clear_old_updated_area (GdkGLContext *context)
+{
+  int i;
+
+  for (i = 0; i < 2; i++)
+    {
+      g_clear_pointer (&context->old_updated_area[i], cairo_region_destroy);
+    }
+}
+
+static void
 gdk_gl_context_dispose (GObject *gobject)
 {
   GdkGLContext *context = GDK_GL_CONTEXT (gobject);
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
   GdkGLContext *current;
 
+  gdk_gl_context_clear_old_updated_area (context);
+
   current = g_private_get (&thread_current_context);
   if (current == context)
     g_private_replace (&thread_current_context, NULL);
@@ -325,6 +338,19 @@ gdk_gl_context_real_end_frame (GdkDrawContext *draw_context,
       gdk_draw_context_end_frame (GDK_DRAW_CONTEXT (shared), painted, damage);
       return;
     }
+
+  if (context->old_updated_area[1])
+    cairo_region_destroy (context->old_updated_area[1]);
+  context->old_updated_area[1] = context->old_updated_area[0];
+  context->old_updated_area[0] = cairo_region_reference (painted);
+}
+
+static void
+gdk_gl_context_surface_resized (GdkDrawContext *draw_context)
+{
+  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
+
+  gdk_gl_context_clear_old_updated_area (context);
 }
 
 static void
@@ -338,6 +364,7 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
 
   draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
   draw_context_class->end_frame = gdk_gl_context_real_end_frame;
+  draw_context_class->surface_resized = gdk_gl_context_surface_resized;
 
   /**
    * GdkGLContext:shared-context: