cc: Add debug rects for touch and wheel event handler regions and slow scrolling areas

This change adds new debug rect types to show regions with touch or
wheel event handlers as well as areas that scroll slowly. Each rect type
also displays a label in the top left corner to make them easier to
identify.

BUG=253552

Review URL: https://chromiumcodereview.appspot.com/17599002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@209252 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 71 insertions, 0 deletions

diff --git a/cc/debug/debug_rect_history.cc b/cc/debug/debug_rect_history.cc
index 7eaf6ab..24ba86e 100644
--- a/cc/debug/debug_rect_history.cc
+++ b/cc/debug/debug_rect_history.cc
@@ -9,6 +9,7 @@
 #include "cc/layers/render_surface_impl.h"
 #include "cc/trees/damage_tracker.h"
 #include "cc/trees/layer_tree_host.h"
+#include "cc/trees/layer_tree_host_common.h"
 
 namespace cc {
 
@@ -31,6 +32,15 @@ void DebugRectHistory::SaveDebugRectsForCurrentFrame(
   // store all debug rects for a history of many frames.
   debug_rects_.clear();
 
+  if (debug_state.show_touch_event_handler_rects)
+    SaveTouchEventHandlerRects(root_layer);
+
+  if (debug_state.show_wheel_event_handler_rects)
+    SaveWheelEventHandlerRects(root_layer);
+
+  if (debug_state.show_non_fast_scrollable_rects)
+    SaveNonFastScrollableRects(root_layer);
+
   if (debug_state.show_paint_rects)
     SavePaintRects(root_layer);
 
@@ -162,4 +172,65 @@ void DebugRectHistory::SaveNonOccludingRects(
   }
 }
 
+void DebugRectHistory::SaveTouchEventHandlerRects(LayerImpl* layer) {
+  LayerTreeHostCommon::CallFunctionForSubtree<LayerImpl>(
+      layer,
+      base::Bind(&DebugRectHistory::SaveTouchEventHandlerRectsCallback,
+                 base::Unretained(this)));
+}
+
+void DebugRectHistory::SaveTouchEventHandlerRectsCallback(LayerImpl* layer) {
+  for (Region::Iterator iter(layer->touch_event_handler_region());
+       iter.has_rect();
+       iter.next()) {
+    gfx::RectF touch_rect = gfx::ScaleRect(iter.rect(),
+                                           layer->contents_scale_x(),
+                                           layer->contents_scale_y());
+    debug_rects_.push_back(DebugRect(TOUCH_EVENT_HANDLER_RECT_TYPE,
+                                     MathUtil::MapClippedRect(
+                                         layer->screen_space_transform(),
+                                         touch_rect)));
+  }
+}
+
+void DebugRectHistory::SaveWheelEventHandlerRects(LayerImpl* layer) {
+  LayerTreeHostCommon::CallFunctionForSubtree<LayerImpl>(
+      layer,
+      base::Bind(&DebugRectHistory::SaveWheelEventHandlerRectsCallback,
+                 base::Unretained(this)));
+}
+
+void DebugRectHistory::SaveWheelEventHandlerRectsCallback(LayerImpl* layer) {
+  if (!layer->have_wheel_event_handlers())
+    return;
+
+  gfx::RectF wheel_rect = gfx::RectF(layer->content_bounds());
+  wheel_rect.Scale(layer->contents_scale_x(), layer->contents_scale_y());
+  debug_rects_.push_back(DebugRect(WHEEL_EVENT_HANDLER_RECT_TYPE,
+                                   MathUtil::MapClippedRect(
+                                       layer->screen_space_transform(),
+                                       wheel_rect)));
+}
+
+void DebugRectHistory::SaveNonFastScrollableRects(LayerImpl* layer) {
+  LayerTreeHostCommon::CallFunctionForSubtree<LayerImpl>(
+      layer,
+      base::Bind(&DebugRectHistory::SaveNonFastScrollableRectsCallback,
+                 base::Unretained(this)));
+}
+
+void DebugRectHistory::SaveNonFastScrollableRectsCallback(LayerImpl* layer) {
+  for (Region::Iterator iter(layer->non_fast_scrollable_region());
+       iter.has_rect();
+       iter.next()) {
+    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)));
+  }
+}
+
 }  // namespace cc