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) {
+  for (int surface_index = render_surface_layer_list.size() - 1;

[danakj, 2013/11/28 17:48:56]

Why not use LayerIterator?

[avallee, 2013/12/06 22:08:32]

Done. I think we're iterating front to back now instead of back to front, but it
doesn't really matter.

+       surface_index >= 0;
+       --surface_index) {
+    LayerImpl* render_surface_layer = render_surface_layer_list[surface_index];
+    RenderSurfaceImpl* render_surface = render_surface_layer->render_surface();
+    DCHECK(render_surface);
+
+    const LayerImplList& layer_list = render_surface->layer_list();
+    for (unsigned layer_index = 0;
+         layer_index < layer_list.size();
+         ++layer_index) {
+      LayerImpl* layer = layer_list[layer_index];
+
+      gfx::BoxF inflated_bounds;
+      if (!layer->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