Support for drawing a debug border around animated layers

cc/debug/debug_rect_history.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/debug/debug_rect_history.h"
 
 #include "cc/base/math_util.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/layers/render_surface_impl.h"
 #include "cc/trees/damage_tracker.h"
@@ skipping 40 matching lines @@
     SaveSurfaceDamageRects(render_surface_layer_list);
 
   if (debug_state.show_screen_space_rects)
     SaveScreenSpaceRects(render_surface_layer_list);
 
   if (debug_state.show_occluding_rects)
     SaveOccludingRects(occluding_screen_space_rects);
 
   if (debug_state.show_non_occluding_rects)
     SaveNonOccludingRects(non_occluding_screen_space_rects);
+
+  if (debug_state.show_layer_animation_bounds_rects)
+    SaveLayerAnimationBoundsRects(render_surface_layer_list);
 }
 
 void DebugRectHistory::SavePaintRects(LayerImpl* layer) {
   // We would like to visualize where any layer's paint rect (update rect) has
   // changed, regardless of whether this layer is skipped for actual drawing or
   // not. Therefore we traverse recursively over all layers, not just the render
   // surface list.
 
   if (!layer->update_rect().IsEmpty() && layer->DrawsContent()) {
     float width_scale = layer->content_bounds().width() /
@@ skipping 154 matching lines @@
     gfx::RectF scroll_rect = gfx::ScaleRect(iter.rect(),
                                             layer->contents_scale_x(),
                                             layer->contents_scale_y());
     debug_rects_.push_back(DebugRect(NON_FAST_SCROLLABLE_RECT_TYPE,
                                      MathUtil::MapClippedRect(
                                          layer->screen_space_transform(),
                                          scroll_rect)));
   }
 }
 
+void DebugRectHistory::SaveLayerAnimationBoundsRects(
+    const LayerImplList& render_surface_layer_list) {
+  typedef LayerIterator<LayerImpl,
+                        LayerImplList,
+                        RenderSurfaceImpl,
+                        LayerIteratorActions::FrontToBack> LayerIteratorType;
+  LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
+  for (LayerIteratorType it =
+           LayerIteratorType::Begin(&render_surface_layer_list);
+       it != end; ++it) {
+    if (!it.represents_itself())
+      continue;
+    gfx::BoxF inflated_bounds;
+    if (!(*it)->GetAnimationBounds(&inflated_bounds))
+      continue;
+
+    debug_rects_.push_back(DebugRect(ANIMATION_BOUNDS_RECT_TYPE,
+                                     gfx::RectF(inflated_bounds.x(),
+                                                inflated_bounds.y(),
+                                                inflated_bounds.width(),
+                                                inflated_bounds.height())));
+  }
+}
+
 }  // namespace cc