root/cc/debug/debug_rect_history.cc

DEFINITIONS

1. Create
2. SaveDebugRectsForCurrentFrame
3. SavePaintRects
4. SavePropertyChangedRects
5. SaveSurfaceDamageRects
6. SaveScreenSpaceRects
7. SaveOccludingRects
8. SaveNonOccludingRects
9. SaveTouchEventHandlerRects
10. SaveTouchEventHandlerRectsCallback
11. SaveWheelEventHandlerRects
12. SaveWheelEventHandlerRectsCallback
13. SaveScrollEventHandlerRects
14. SaveScrollEventHandlerRectsCallback
15. SaveNonFastScrollableRects
16. SaveNonFastScrollableRectsCallback
17. SaveLayerAnimationBoundsRects

// 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/layer_iterator.h"
#include "cc/layers/layer_utils.h"
#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 {

// static
scoped_ptr<DebugRectHistory> DebugRectHistory::Create() {
  return make_scoped_ptr(new DebugRectHistory());
}

DebugRectHistory::DebugRectHistory() {}

DebugRectHistory::~DebugRectHistory() {}

void DebugRectHistory::SaveDebugRectsForCurrentFrame(
    LayerImpl* root_layer,
    LayerImpl* hud_layer,
    const LayerImplList& render_surface_layer_list,
    const std::vector<gfx::Rect>& occluding_screen_space_rects,
    const std::vector<gfx::Rect>& non_occluding_screen_space_rects,
    const LayerTreeDebugState& debug_state) {
  // For now, clear all rects from previous frames. In the future we may want to
  // 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_scroll_event_handler_rects)
    SaveScrollEventHandlerRects(root_layer);

  if (debug_state.show_non_fast_scrollable_rects)
    SaveNonFastScrollableRects(root_layer);

  if (debug_state.show_paint_rects)
    SavePaintRects(root_layer);

  if (debug_state.show_property_changed_rects)
    SavePropertyChangedRects(render_surface_layer_list, hud_layer);

  if (debug_state.show_surface_damage_rects)
    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() /
                        static_cast<float>(layer->bounds().width());
    float height_scale = layer->content_bounds().height() /
                         static_cast<float>(layer->bounds().height());
    gfx::RectF update_content_rect =
        gfx::ScaleRect(layer->update_rect(), width_scale, height_scale);
    debug_rects_.push_back(
        DebugRect(PAINT_RECT_TYPE,
                  MathUtil::MapClippedRect(layer->screen_space_transform(),
                                           update_content_rect)));
  }

  for (unsigned i = 0; i < layer->children().size(); ++i)
    SavePaintRects(layer->children()[i]);
}

void DebugRectHistory::SavePropertyChangedRects(
    const LayerImplList& render_surface_layer_list,
    LayerImpl* hud_layer) {
  for (int surface_index = render_surface_layer_list.size() - 1;
       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];

      if (LayerTreeHostCommon::RenderSurfaceContributesToTarget<LayerImpl>(
              layer, render_surface_layer->id()))
        continue;

      if (layer == hud_layer)
        continue;

      if (layer->LayerPropertyChanged()) {
        debug_rects_.push_back(
            DebugRect(PROPERTY_CHANGED_RECT_TYPE,
                      MathUtil::MapEnclosingClippedRect(
                          layer->screen_space_transform(),
                          gfx::Rect(layer->content_bounds()))));
      }
    }
  }
}

void DebugRectHistory::SaveSurfaceDamageRects(
    const LayerImplList& render_surface_layer_list) {
  for (int surface_index = render_surface_layer_list.size() - 1;
       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);

    debug_rects_.push_back(DebugRect(
        SURFACE_DAMAGE_RECT_TYPE,
        MathUtil::MapClippedRect(
            render_surface->screen_space_transform(),
            render_surface->damage_tracker()->current_damage_rect())));
  }
}

void DebugRectHistory::SaveScreenSpaceRects(
    const LayerImplList& render_surface_layer_list) {
  for (int surface_index = render_surface_layer_list.size() - 1;
       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);

    debug_rects_.push_back(DebugRect(
        SCREEN_SPACE_RECT_TYPE,
        MathUtil::MapClippedRect(render_surface->screen_space_transform(),
                                 render_surface->content_rect())));

    if (render_surface_layer->replica_layer()) {
      debug_rects_.push_back(
          DebugRect(REPLICA_SCREEN_SPACE_RECT_TYPE,
                    MathUtil::MapClippedRect(
                        render_surface->replica_screen_space_transform(),
                        render_surface->content_rect())));
    }
  }
}

void DebugRectHistory::SaveOccludingRects(
    const std::vector<gfx::Rect>& occluding_rects) {
  for (size_t i = 0; i < occluding_rects.size(); ++i)
    debug_rects_.push_back(DebugRect(OCCLUDING_RECT_TYPE, occluding_rects[i]));
}

void DebugRectHistory::SaveNonOccludingRects(
    const std::vector<gfx::Rect>& non_occluding_rects) {
  for (size_t i = 0; i < non_occluding_rects.size(); ++i) {
    debug_rects_.push_back(
        DebugRect(NONOCCLUDING_RECT_TYPE, non_occluding_rects[i]));
  }
}

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::SaveScrollEventHandlerRects(LayerImpl* layer) {
  LayerTreeHostCommon::CallFunctionForSubtree<LayerImpl>(
      layer,
      base::Bind(&DebugRectHistory::SaveScrollEventHandlerRectsCallback,
                 base::Unretained(this)));
}

void DebugRectHistory::SaveScrollEventHandlerRectsCallback(LayerImpl* layer) {
  if (!layer->have_scroll_event_handlers())
    return;

  gfx::RectF scroll_rect = gfx::RectF(layer->content_bounds());
  scroll_rect.Scale(layer->contents_scale_x(), layer->contents_scale_y());
  debug_rects_.push_back(DebugRect(
      SCROLL_EVENT_HANDLER_RECT_TYPE,
      MathUtil::MapClippedRect(layer->screen_space_transform(), scroll_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)));
  }
}

void DebugRectHistory::SaveLayerAnimationBoundsRects(
    const LayerImplList& render_surface_layer_list) {
  typedef LayerIterator<LayerImpl> 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;

    // TODO(avallee): Figure out if we should show something for a layer who's
    // animating bounds but that we can't compute them.
    gfx::BoxF inflated_bounds;
    if (!LayerUtils::GetAnimationBounds(**it, &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