cc/trees/layer_tree

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This source file includes following definitions.
layer_tree_impl_
last_set_scroll_offset
SetTotalScrollOffset
GetTotalScrollOffset
IsExternalFlingActive
SetMaxScrollOffset
SetTotalPageScaleFactorAndLimits
SetScrollableSize
next_activation_forces_redraw_
Shutdown
SetRootLayer
InnerViewportScrollLayer
OuterViewportScrollLayer
TotalScrollOffset
TotalMaxScrollOffset
TotalScrollDelta
DetachLayerTree
PushPropertiesTo
InnerViewportContainerLayer
CurrentlyScrollingLayer
SetCurrentlyScrollingLayer
ClearCurrentlyScrollingLayer
VerticalAdjust
ForceScrollbarParameterUpdateAfterScaleChange
SetPageScaleFactorAndLimits
SetPageScaleDelta
ScrollableViewportSize
RootScrollLayerDeviceViewportBounds
ApplySentScrollDeltasFromAbortedCommitTo
ApplySentScrollAndScaleDeltasFromAbortedCommit
ApplyScrollDeltasSinceBeginMainFrameTo
ApplyScrollDeltasSinceBeginMainFrame
SetViewportLayersFromIds
ClearViewportLayers
UpdateDrawProperties
RenderSurfaceLayerList
ScrollableSize
LayerById
RegisterLayer
UnregisterLayer
PushPersistedState
DidBecomeActiveRecursive
DidBecomeActive
ContentsTexturesPurged
SetContentsTexturesPurged
ResetContentsTexturesPurged
SetRequiresHighResToDraw
ResetRequiresHighResToDraw
RequiresHighResToDraw
ViewportSizeInvalid
SetViewportSizeInvalid
ResetViewportSizeInvalid
proxy
settings
GetRendererCapabilities
context_provider
output_surface
resource_provider
tile_manager
frame_rate_counter
paint_time_counter
memory_history
device_viewport_valid_for_tile_management
IsActiveTree
IsPendingTree
IsRecycleTree
FindActiveTreeLayerById
FindPendingTreeLayerById
MaxTextureSize
PinchGestureActive
CurrentFrameTimeTicks
SetNeedsCommit
DrawViewportSize
StartScrollbarAnimation
DidAnimateScrollOffset
SetNeedsRedraw
debug_state
device_scale_factor
debug_rect_history
animationRegistrar
AsValue
SetRootLayerScrollOffsetDelegate
UpdateScrollOffsetDelegate
GetDelegatedScrollOffset
QueueSwapPromise
PassSwapPromises
FinishSwapPromises
BreakSwapPromises
DidModifyTilePriorities
set_ui_resource_request_queue
ResourceIdForUIResource
IsUIResourceOpaque
ProcessUIResourceRequestQueue
AddLayerWithCopyOutputRequest
RemoveLayerWithCopyOutputRequest
LayersWithCopyOutputRequest
// Copyright 2011 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/trees/layer_tree_impl.h"

#include "base/debug/trace_event.h"
#include "cc/animation/keyframed_animation_curve.h"
#include "cc/animation/scrollbar_animation_controller.h"
#include "cc/base/math_util.h"
#include "cc/base/util.h"
#include "cc/debug/traced_value.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_iterator.h"
#include "cc/layers/render_surface_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
#include "cc/resources/ui_resource_request.h"
#include "cc/trees/layer_tree_host_common.h"
#include "cc/trees/layer_tree_host_impl.h"
#include "ui/gfx/size_conversions.h"
#include "ui/gfx/vector2d_conversions.h"

namespace cc {

// This class exists to split the LayerScrollOffsetDelegate between the
// InnerViewportScrollLayer and the OuterViewportScrollLayer in a manner
// that never requires the embedder or LayerImpl to know about.
class LayerScrollOffsetDelegateProxy : public LayerScrollOffsetDelegate {
 public:
  LayerScrollOffsetDelegateProxy(LayerImpl* layer,
                                 LayerScrollOffsetDelegate* delegate,
                                 LayerTreeImpl* layer_tree)
      : layer_(layer), delegate_(delegate), layer_tree_impl_(layer_tree) {}

  gfx::Vector2dF last_set_scroll_offset() const {
    return last_set_scroll_offset_;
  }

  // LayerScrollOffsetDelegate implementation.

  virtual void SetTotalScrollOffset(const gfx::Vector2dF& new_offset) OVERRIDE {
    last_set_scroll_offset_ = new_offset;
    layer_tree_impl_->UpdateScrollOffsetDelegate();
  }

  virtual gfx::Vector2dF GetTotalScrollOffset() OVERRIDE {
    return layer_tree_impl_->GetDelegatedScrollOffset(layer_);
  }

  virtual bool IsExternalFlingActive() const OVERRIDE {
    return delegate_->IsExternalFlingActive();
  }

  // Functions below this point are never called by LayerImpl on its
  // LayerScrollOffsetDelegate, and so are not implemented.
  virtual void SetMaxScrollOffset(const gfx::Vector2dF&) OVERRIDE {
    NOTIMPLEMENTED();
  }

  virtual void SetTotalPageScaleFactorAndLimits(float, float, float) OVERRIDE {
    NOTIMPLEMENTED();
  }

  virtual void SetScrollableSize(const gfx::SizeF& scrollable_size) OVERRIDE {
    NOTIMPLEMENTED();
  }

 private:
  LayerImpl* layer_;
  LayerScrollOffsetDelegate* delegate_;
  LayerTreeImpl* layer_tree_impl_;
  gfx::Vector2dF last_set_scroll_offset_;
};

LayerTreeImpl::LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl)
    : layer_tree_host_impl_(layer_tree_host_impl),
      source_frame_number_(-1),
      hud_layer_(0),
      currently_scrolling_layer_(NULL),
      root_layer_scroll_offset_delegate_(NULL),
      background_color_(0),
      has_transparent_background_(false),
      page_scale_layer_(NULL),
      inner_viewport_scroll_layer_(NULL),
      outer_viewport_scroll_layer_(NULL),
      page_scale_factor_(1),
      page_scale_delta_(1),
      sent_page_scale_delta_(1),
      min_page_scale_factor_(0),
      max_page_scale_factor_(0),
      scrolling_layer_id_from_previous_tree_(0),
      contents_textures_purged_(false),
      requires_high_res_to_draw_(false),
      viewport_size_invalid_(false),
      needs_update_draw_properties_(true),
      needs_full_tree_sync_(true),
      next_activation_forces_redraw_(false) {}

LayerTreeImpl::~LayerTreeImpl() {
  // Need to explicitly clear the tree prior to destroying this so that
  // the LayerTreeImpl pointer is still valid in the LayerImpl dtor.
  DCHECK(!root_layer_);
  DCHECK(layers_with_copy_output_request_.empty());
}

void LayerTreeImpl::Shutdown() { root_layer_.reset(); }

void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
  if (inner_viewport_scroll_layer_)
    inner_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
  if (outer_viewport_scroll_layer_)
    outer_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
  inner_viewport_scroll_delegate_proxy_.reset();
  outer_viewport_scroll_delegate_proxy_.reset();

  root_layer_ = layer.Pass();
  currently_scrolling_layer_ = NULL;
  inner_viewport_scroll_layer_ = NULL;
  outer_viewport_scroll_layer_ = NULL;
  page_scale_layer_ = NULL;

  layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}

LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
  return inner_viewport_scroll_layer_;
}

LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
  return outer_viewport_scroll_layer_;
}

gfx::Vector2dF LayerTreeImpl::TotalScrollOffset() const {
  gfx::Vector2dF offset;

  if (inner_viewport_scroll_layer_)
    offset += inner_viewport_scroll_layer_->TotalScrollOffset();

  if (outer_viewport_scroll_layer_)
    offset += outer_viewport_scroll_layer_->TotalScrollOffset();

  return offset;
}

gfx::Vector2dF LayerTreeImpl::TotalMaxScrollOffset() const {
  gfx::Vector2dF offset;

  if (inner_viewport_scroll_layer_)
    offset += inner_viewport_scroll_layer_->MaxScrollOffset();

  if (outer_viewport_scroll_layer_)
    offset += outer_viewport_scroll_layer_->MaxScrollOffset();

  return offset;
}
gfx::Vector2dF LayerTreeImpl::TotalScrollDelta() const {
  DCHECK(inner_viewport_scroll_layer_);
  gfx::Vector2dF delta = inner_viewport_scroll_layer_->ScrollDelta();

  if (outer_viewport_scroll_layer_)
    delta += outer_viewport_scroll_layer_->ScrollDelta();

  return delta;
}

scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
  // Clear all data structures that have direct references to the layer tree.
  scrolling_layer_id_from_previous_tree_ =
    currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0;
  if (inner_viewport_scroll_layer_)
    inner_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
  if (outer_viewport_scroll_layer_)
    outer_viewport_scroll_layer_->SetScrollOffsetDelegate(NULL);
  inner_viewport_scroll_delegate_proxy_.reset();
  outer_viewport_scroll_delegate_proxy_.reset();
  inner_viewport_scroll_layer_ = NULL;
  outer_viewport_scroll_layer_ = NULL;
  page_scale_layer_ = NULL;
  currently_scrolling_layer_ = NULL;

  render_surface_layer_list_.clear();
  set_needs_update_draw_properties();
  return root_layer_.Pass();
}

void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
  // The request queue should have been processed and does not require a push.
  DCHECK_EQ(ui_resource_request_queue_.size(), 0u);

  if (next_activation_forces_redraw_) {
    layer_tree_host_impl_->SetFullRootLayerDamage();
    next_activation_forces_redraw_ = false;
  }

  target_tree->PassSwapPromises(&swap_promise_list_);

  target_tree->SetPageScaleFactorAndLimits(
      page_scale_factor(), min_page_scale_factor(), max_page_scale_factor());
  target_tree->SetPageScaleDelta(
      target_tree->page_scale_delta() / target_tree->sent_page_scale_delta());
  target_tree->set_sent_page_scale_delta(1);

  if (page_scale_layer_ && inner_viewport_scroll_layer_) {
    target_tree->SetViewportLayersFromIds(
        page_scale_layer_->id(),
        inner_viewport_scroll_layer_->id(),
        outer_viewport_scroll_layer_ ? outer_viewport_scroll_layer_->id()
                                     : Layer::INVALID_ID);
  } else {
    target_tree->ClearViewportLayers();
  }
  // This should match the property synchronization in
  // LayerTreeHost::finishCommitOnImplThread().
  target_tree->set_source_frame_number(source_frame_number());
  target_tree->set_background_color(background_color());
  target_tree->set_has_transparent_background(has_transparent_background());

  if (ContentsTexturesPurged())
    target_tree->SetContentsTexturesPurged();
  else
    target_tree->ResetContentsTexturesPurged();

  // Always reset this flag on activation, as we would only have activated
  // if we were in a good state.
  target_tree->ResetRequiresHighResToDraw();

  if (ViewportSizeInvalid())
    target_tree->SetViewportSizeInvalid();
  else
    target_tree->ResetViewportSizeInvalid();

  if (hud_layer())
    target_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(
        LayerTreeHostCommon::FindLayerInSubtree(
            target_tree->root_layer(), hud_layer()->id())));
  else
    target_tree->set_hud_layer(NULL);
}

LayerImpl* LayerTreeImpl::InnerViewportContainerLayer() const {
  return inner_viewport_scroll_layer_
             ? inner_viewport_scroll_layer_->scroll_clip_layer()
             : NULL;
}

LayerImpl* LayerTreeImpl::CurrentlyScrollingLayer() const {
  DCHECK(IsActiveTree());
  return currently_scrolling_layer_;
}

void LayerTreeImpl::SetCurrentlyScrollingLayer(LayerImpl* layer) {
  if (currently_scrolling_layer_ == layer)
    return;

  if (currently_scrolling_layer_ &&
      currently_scrolling_layer_->scrollbar_animation_controller())
    currently_scrolling_layer_->scrollbar_animation_controller()
        ->DidScrollGestureEnd(CurrentFrameTimeTicks());
  currently_scrolling_layer_ = layer;
  if (layer && layer->scrollbar_animation_controller())
    layer->scrollbar_animation_controller()->DidScrollGestureBegin();
}

void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
  SetCurrentlyScrollingLayer(NULL);
  scrolling_layer_id_from_previous_tree_ = 0;
}

float LayerTreeImpl::VerticalAdjust(const int clip_layer_id) const {
  LayerImpl* container_layer = InnerViewportContainerLayer();
  if (!container_layer || clip_layer_id != container_layer->id())
    return 0.f;

  return layer_tree_host_impl_->VerticalAdjust();
}

namespace {

void ForceScrollbarParameterUpdateAfterScaleChange(LayerImpl* current_layer) {
  if (!current_layer)
    return;

  while (current_layer) {
    current_layer->ScrollbarParametersDidChange();
    current_layer = current_layer->parent();
  }
}

}  // namespace

void LayerTreeImpl::SetPageScaleFactorAndLimits(float page_scale_factor,
    float min_page_scale_factor, float max_page_scale_factor) {
  if (!page_scale_factor)
    return;

  if (min_page_scale_factor == min_page_scale_factor_ &&
      max_page_scale_factor == max_page_scale_factor_ &&
      page_scale_factor == page_scale_factor_)
    return;

  min_page_scale_factor_ = min_page_scale_factor;
  max_page_scale_factor_ = max_page_scale_factor;
  page_scale_factor_ = page_scale_factor;

  if (root_layer_scroll_offset_delegate_) {
    root_layer_scroll_offset_delegate_->SetTotalPageScaleFactorAndLimits(
        total_page_scale_factor(),
        this->min_page_scale_factor(),
        this->max_page_scale_factor());
  }

  ForceScrollbarParameterUpdateAfterScaleChange(page_scale_layer());
}

void LayerTreeImpl::SetPageScaleDelta(float delta) {
  // Clamp to the current min/max limits.
  float total = page_scale_factor_ * delta;
  if (min_page_scale_factor_ && total < min_page_scale_factor_)
    delta = min_page_scale_factor_ / page_scale_factor_;
  else if (max_page_scale_factor_ && total > max_page_scale_factor_)
    delta = max_page_scale_factor_ / page_scale_factor_;

  if (delta == page_scale_delta_)
    return;

  page_scale_delta_ = delta;

  if (IsActiveTree()) {
    LayerTreeImpl* pending_tree = layer_tree_host_impl_->pending_tree();
    if (pending_tree) {
      DCHECK_EQ(1, pending_tree->sent_page_scale_delta());
      pending_tree->SetPageScaleDelta(
          page_scale_delta_ / sent_page_scale_delta_);
    }
  }

  set_needs_update_draw_properties();

  if (root_layer_scroll_offset_delegate_) {
    root_layer_scroll_offset_delegate_->SetTotalPageScaleFactorAndLimits(
        total_page_scale_factor(),
        min_page_scale_factor(),
        max_page_scale_factor());
  }
}

gfx::SizeF LayerTreeImpl::ScrollableViewportSize() const {
  if (outer_viewport_scroll_layer_)
    return layer_tree_host_impl_->UnscaledScrollableViewportSize();
  else
    return gfx::ScaleSize(
        layer_tree_host_impl_->UnscaledScrollableViewportSize(),
        1.0f / total_page_scale_factor());
}

gfx::Rect LayerTreeImpl::RootScrollLayerDeviceViewportBounds() const {
  LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
                                     ? OuterViewportScrollLayer()
                                     : InnerViewportScrollLayer();
  if (!root_scroll_layer || root_scroll_layer->children().empty())
    return gfx::Rect();
  LayerImpl* layer = root_scroll_layer->children()[0];
  return MathUtil::MapEnclosingClippedRect(layer->screen_space_transform(),
                                           gfx::Rect(layer->content_bounds()));
}

static void ApplySentScrollDeltasFromAbortedCommitTo(LayerImpl* layer) {
  layer->ApplySentScrollDeltasFromAbortedCommit();
}

void LayerTreeImpl::ApplySentScrollAndScaleDeltasFromAbortedCommit() {
  DCHECK(IsActiveTree());

  page_scale_factor_ *= sent_page_scale_delta_;
  page_scale_delta_ /= sent_page_scale_delta_;
  sent_page_scale_delta_ = 1.f;

  if (!root_layer())
    return;

  LayerTreeHostCommon::CallFunctionForSubtree(
      root_layer(), base::Bind(&ApplySentScrollDeltasFromAbortedCommitTo));
}

static void ApplyScrollDeltasSinceBeginMainFrameTo(LayerImpl* layer) {
  layer->ApplyScrollDeltasSinceBeginMainFrame();
}

void LayerTreeImpl::ApplyScrollDeltasSinceBeginMainFrame() {
  DCHECK(IsPendingTree());
  if (!root_layer())
    return;

  LayerTreeHostCommon::CallFunctionForSubtree(
      root_layer(), base::Bind(&ApplyScrollDeltasSinceBeginMainFrameTo));
}

void LayerTreeImpl::SetViewportLayersFromIds(
    int page_scale_layer_id,
    int inner_viewport_scroll_layer_id,
    int outer_viewport_scroll_layer_id) {
  page_scale_layer_ = LayerById(page_scale_layer_id);
  DCHECK(page_scale_layer_);

  inner_viewport_scroll_layer_ =
      LayerById(inner_viewport_scroll_layer_id);
  DCHECK(inner_viewport_scroll_layer_);

  outer_viewport_scroll_layer_ =
      LayerById(outer_viewport_scroll_layer_id);
  DCHECK(outer_viewport_scroll_layer_ ||
         outer_viewport_scroll_layer_id == Layer::INVALID_ID);

  if (!root_layer_scroll_offset_delegate_)
    return;

  inner_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
      new LayerScrollOffsetDelegateProxy(inner_viewport_scroll_layer_,
                                         root_layer_scroll_offset_delegate_,
                                         this));

  if (outer_viewport_scroll_layer_)
    outer_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
        new LayerScrollOffsetDelegateProxy(outer_viewport_scroll_layer_,
                                           root_layer_scroll_offset_delegate_,
                                           this));
}

void LayerTreeImpl::ClearViewportLayers() {
  page_scale_layer_ = NULL;
  inner_viewport_scroll_layer_ = NULL;
  outer_viewport_scroll_layer_ = NULL;
}

void LayerTreeImpl::UpdateDrawProperties() {
  needs_update_draw_properties_ = false;
  render_surface_layer_list_.clear();

  // For max_texture_size.
  if (!layer_tree_host_impl_->renderer())
    return;

  if (!root_layer())
    return;

  {
    TRACE_EVENT2("cc",
                 "LayerTreeImpl::UpdateDrawProperties",
                 "IsActive",
                 IsActiveTree(),
                 "SourceFrameNumber",
                 source_frame_number_);
    LayerImpl* page_scale_layer =
        page_scale_layer_ ? page_scale_layer_ : InnerViewportContainerLayer();
    bool can_render_to_separate_surface =
        !output_surface()->ForcedDrawToSoftwareDevice();
    LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
        root_layer(),
        DrawViewportSize(),
        layer_tree_host_impl_->DrawTransform(),
        device_scale_factor(),
        total_page_scale_factor(),
        page_scale_layer,
        MaxTextureSize(),
        settings().can_use_lcd_text,
        can_render_to_separate_surface,
        settings().layer_transforms_should_scale_layer_contents,
        &render_surface_layer_list_);
    LayerTreeHostCommon::CalculateDrawProperties(&inputs);
  }

  {
    TRACE_EVENT2("cc",
                 "LayerTreeImpl::UpdateTilePriorities",
                 "IsActive",
                 IsActiveTree(),
                 "SourceFrameNumber",
                 source_frame_number_);
    // LayerIterator is used here instead of CallFunctionForSubtree to only
    // UpdateTilePriorities on layers that will be visible (and thus have valid
    // draw properties) and not because any ordering is required.
    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;
      LayerImpl* layer = *it;

      layer->UpdateTilePriorities();
      if (layer->mask_layer())
        layer->mask_layer()->UpdateTilePriorities();
      if (layer->replica_layer() && layer->replica_layer()->mask_layer())
        layer->replica_layer()->mask_layer()->UpdateTilePriorities();
    }
  }

  DCHECK(!needs_update_draw_properties_) <<
      "CalcDrawProperties should not set_needs_update_draw_properties()";
}

const LayerImplList& LayerTreeImpl::RenderSurfaceLayerList() const {
  // If this assert triggers, then the list is dirty.
  DCHECK(!needs_update_draw_properties_);
  return render_surface_layer_list_;
}

gfx::Size LayerTreeImpl::ScrollableSize() const {
  LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
                                     ? OuterViewportScrollLayer()
                                     : InnerViewportScrollLayer();
  if (!root_scroll_layer || root_scroll_layer->children().empty())
    return gfx::Size();
  return root_scroll_layer->children()[0]->bounds();
}

LayerImpl* LayerTreeImpl::LayerById(int id) {
  LayerIdMap::iterator iter = layer_id_map_.find(id);
  return iter != layer_id_map_.end() ? iter->second : NULL;
}

void LayerTreeImpl::RegisterLayer(LayerImpl* layer) {
  DCHECK(!LayerById(layer->id()));
  layer_id_map_[layer->id()] = layer;
}

void LayerTreeImpl::UnregisterLayer(LayerImpl* layer) {
  DCHECK(LayerById(layer->id()));
  layer_id_map_.erase(layer->id());
}

void LayerTreeImpl::PushPersistedState(LayerTreeImpl* pending_tree) {
  pending_tree->SetCurrentlyScrollingLayer(
      LayerTreeHostCommon::FindLayerInSubtree(pending_tree->root_layer(),
          currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0));
}

static void DidBecomeActiveRecursive(LayerImpl* layer) {
  layer->DidBecomeActive();
  for (size_t i = 0; i < layer->children().size(); ++i)
    DidBecomeActiveRecursive(layer->children()[i]);
}

void LayerTreeImpl::DidBecomeActive() {
  if (!root_layer())
    return;

  if (scrolling_layer_id_from_previous_tree_) {
    currently_scrolling_layer_ = LayerTreeHostCommon::FindLayerInSubtree(
        root_layer_.get(), scrolling_layer_id_from_previous_tree_);
  }

  DidBecomeActiveRecursive(root_layer());
}

bool LayerTreeImpl::ContentsTexturesPurged() const {
  return contents_textures_purged_;
}

void LayerTreeImpl::SetContentsTexturesPurged() {
  if (contents_textures_purged_)
    return;
  contents_textures_purged_ = true;
  layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}

void LayerTreeImpl::ResetContentsTexturesPurged() {
  if (!contents_textures_purged_)
    return;
  contents_textures_purged_ = false;
  layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}

void LayerTreeImpl::SetRequiresHighResToDraw() {
  requires_high_res_to_draw_ = true;
}

void LayerTreeImpl::ResetRequiresHighResToDraw() {
  requires_high_res_to_draw_ = false;
}

bool LayerTreeImpl::RequiresHighResToDraw() const {
  return requires_high_res_to_draw_;
}

bool LayerTreeImpl::ViewportSizeInvalid() const {
  return viewport_size_invalid_;
}

void LayerTreeImpl::SetViewportSizeInvalid() {
  viewport_size_invalid_ = true;
  layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}

void LayerTreeImpl::ResetViewportSizeInvalid() {
  viewport_size_invalid_ = false;
  layer_tree_host_impl_->OnCanDrawStateChangedForTree();
}

Proxy* LayerTreeImpl::proxy() const {
  return layer_tree_host_impl_->proxy();
}

const LayerTreeSettings& LayerTreeImpl::settings() const {
  return layer_tree_host_impl_->settings();
}

const RendererCapabilitiesImpl& LayerTreeImpl::GetRendererCapabilities() const {
  return layer_tree_host_impl_->GetRendererCapabilities();
}

ContextProvider* LayerTreeImpl::context_provider() const {
  return output_surface()->context_provider();
}

OutputSurface* LayerTreeImpl::output_surface() const {
  return layer_tree_host_impl_->output_surface();
}

ResourceProvider* LayerTreeImpl::resource_provider() const {
  return layer_tree_host_impl_->resource_provider();
}

TileManager* LayerTreeImpl::tile_manager() const {
  return layer_tree_host_impl_->tile_manager();
}

FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
  return layer_tree_host_impl_->fps_counter();
}

PaintTimeCounter* LayerTreeImpl::paint_time_counter() const {
  return layer_tree_host_impl_->paint_time_counter();
}

MemoryHistory* LayerTreeImpl::memory_history() const {
  return layer_tree_host_impl_->memory_history();
}

bool LayerTreeImpl::device_viewport_valid_for_tile_management() const {
  return layer_tree_host_impl_->device_viewport_valid_for_tile_management();
}

bool LayerTreeImpl::IsActiveTree() const {
  return layer_tree_host_impl_->active_tree() == this;
}

bool LayerTreeImpl::IsPendingTree() const {
  return layer_tree_host_impl_->pending_tree() == this;
}

bool LayerTreeImpl::IsRecycleTree() const {
  return layer_tree_host_impl_->recycle_tree() == this;
}

LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
  LayerTreeImpl* tree = layer_tree_host_impl_->active_tree();
  if (!tree)
    return NULL;
  return tree->LayerById(id);
}

LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
  LayerTreeImpl* tree = layer_tree_host_impl_->pending_tree();
  if (!tree)
    return NULL;
  return tree->LayerById(id);
}

int LayerTreeImpl::MaxTextureSize() const {
  return layer_tree_host_impl_->GetRendererCapabilities().max_texture_size;
}

bool LayerTreeImpl::PinchGestureActive() const {
  return layer_tree_host_impl_->pinch_gesture_active();
}

base::TimeTicks LayerTreeImpl::CurrentFrameTimeTicks() const {
  return layer_tree_host_impl_->CurrentFrameTimeTicks();
}

void LayerTreeImpl::SetNeedsCommit() {
  layer_tree_host_impl_->SetNeedsCommit();
}

gfx::Size LayerTreeImpl::DrawViewportSize() const {
  return layer_tree_host_impl_->DrawViewportSize();
}

void LayerTreeImpl::StartScrollbarAnimation() {
  layer_tree_host_impl_->StartScrollbarAnimation();
}

void LayerTreeImpl::DidAnimateScrollOffset() {
  layer_tree_host_impl_->DidAnimateScrollOffset();
}

void LayerTreeImpl::SetNeedsRedraw() {
  layer_tree_host_impl_->SetNeedsRedraw();
}

const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
  return layer_tree_host_impl_->debug_state();
}

float LayerTreeImpl::device_scale_factor() const {
  return layer_tree_host_impl_->device_scale_factor();
}

DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
  return layer_tree_host_impl_->debug_rect_history();
}

AnimationRegistrar* LayerTreeImpl::animationRegistrar() const {
  return layer_tree_host_impl_->animation_registrar();
}

scoped_ptr<base::Value> LayerTreeImpl::AsValue() const {
  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
  TracedValue::MakeDictIntoImplicitSnapshot(
      state.get(), "cc::LayerTreeImpl", this);

  state->Set("root_layer", root_layer_->AsValue().release());

  scoped_ptr<base::ListValue> render_surface_layer_list(new base::ListValue());
  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;
    render_surface_layer_list->Append(TracedValue::CreateIDRef(*it).release());
  }

  state->Set("render_surface_layer_list",
             render_surface_layer_list.release());
  return state.PassAs<base::Value>();
}

void LayerTreeImpl::SetRootLayerScrollOffsetDelegate(
    LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
  if (root_layer_scroll_offset_delegate_ == root_layer_scroll_offset_delegate)
    return;

  if (!root_layer_scroll_offset_delegate) {
    // Make sure we remove the proxies from their layers before
    // releasing them.
    if (InnerViewportScrollLayer())
      InnerViewportScrollLayer()->SetScrollOffsetDelegate(NULL);
    if (OuterViewportScrollLayer())
      OuterViewportScrollLayer()->SetScrollOffsetDelegate(NULL);
    inner_viewport_scroll_delegate_proxy_.reset();
    outer_viewport_scroll_delegate_proxy_.reset();
  }

  root_layer_scroll_offset_delegate_ = root_layer_scroll_offset_delegate;

  if (root_layer_scroll_offset_delegate_) {
    root_layer_scroll_offset_delegate_->SetTotalScrollOffset(
        TotalScrollOffset());
    root_layer_scroll_offset_delegate_->SetMaxScrollOffset(
        TotalMaxScrollOffset());
    root_layer_scroll_offset_delegate_->SetScrollableSize(ScrollableSize());
    root_layer_scroll_offset_delegate_->SetTotalPageScaleFactorAndLimits(
        total_page_scale_factor(),
        min_page_scale_factor(),
        max_page_scale_factor());

    if (inner_viewport_scroll_layer_) {
      inner_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
          new LayerScrollOffsetDelegateProxy(InnerViewportScrollLayer(),
                                             root_layer_scroll_offset_delegate_,
                                             this));
      inner_viewport_scroll_layer_->SetScrollOffsetDelegate(
          inner_viewport_scroll_delegate_proxy_.get());
    }

    if (outer_viewport_scroll_layer_) {
      outer_viewport_scroll_delegate_proxy_ = make_scoped_ptr(
          new LayerScrollOffsetDelegateProxy(OuterViewportScrollLayer(),
                                             root_layer_scroll_offset_delegate_,
                                             this));
      outer_viewport_scroll_layer_->SetScrollOffsetDelegate(
          outer_viewport_scroll_delegate_proxy_.get());
    }
  }
}

void LayerTreeImpl::UpdateScrollOffsetDelegate() {
  DCHECK(InnerViewportScrollLayer());
  DCHECK(root_layer_scroll_offset_delegate_);

  gfx::Vector2dF offset =
      inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();

  if (OuterViewportScrollLayer())
    offset += outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();

  root_layer_scroll_offset_delegate_->SetTotalScrollOffset(offset);
  root_layer_scroll_offset_delegate_->SetMaxScrollOffset(
      TotalMaxScrollOffset());
}

gfx::Vector2dF LayerTreeImpl::GetDelegatedScrollOffset(LayerImpl* layer) {
  DCHECK(root_layer_scroll_offset_delegate_);
  DCHECK(InnerViewportScrollLayer());
  if (layer == InnerViewportScrollLayer() && !OuterViewportScrollLayer())
    return root_layer_scroll_offset_delegate_->GetTotalScrollOffset();

  // If we get here, we have both inner/outer viewports, and need to distribute
  // the scroll offset between them.
  DCHECK(inner_viewport_scroll_delegate_proxy_);
  DCHECK(outer_viewport_scroll_delegate_proxy_);
  gfx::Vector2dF inner_viewport_offset =
      inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
  gfx::Vector2dF outer_viewport_offset =
      outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();

  // It may be nothing has changed.
  gfx::Vector2dF delegate_offset =
      root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
  if (inner_viewport_offset + outer_viewport_offset == delegate_offset) {
    if (layer == InnerViewportScrollLayer())
      return inner_viewport_offset;
    else
      return outer_viewport_offset;
  }

  gfx::Vector2d max_outer_viewport_scroll_offset =
      OuterViewportScrollLayer()->MaxScrollOffset();

  outer_viewport_offset = delegate_offset - inner_viewport_offset;
  outer_viewport_offset.SetToMin(max_outer_viewport_scroll_offset);
  outer_viewport_offset.SetToMax(gfx::Vector2d());

  if (layer == OuterViewportScrollLayer())
    return outer_viewport_offset;

  inner_viewport_offset = delegate_offset - outer_viewport_offset;

  return inner_viewport_offset;
}

void LayerTreeImpl::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
  DCHECK(swap_promise);
  if (swap_promise_list_.size() > kMaxQueuedSwapPromiseNumber)
    BreakSwapPromises(SwapPromise::SWAP_PROMISE_LIST_OVERFLOW);
  swap_promise_list_.push_back(swap_promise.Pass());
}

void LayerTreeImpl::PassSwapPromises(
    ScopedPtrVector<SwapPromise>* new_swap_promise) {
  swap_promise_list_.insert_and_take(swap_promise_list_.end(),
                                     *new_swap_promise);
  new_swap_promise->clear();
}

void LayerTreeImpl::FinishSwapPromises(CompositorFrameMetadata* metadata) {
  for (size_t i = 0; i < swap_promise_list_.size(); i++)
    swap_promise_list_[i]->DidSwap(metadata);
  swap_promise_list_.clear();
}

void LayerTreeImpl::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
  for (size_t i = 0; i < swap_promise_list_.size(); i++)
    swap_promise_list_[i]->DidNotSwap(reason);
  swap_promise_list_.clear();
}

void LayerTreeImpl::DidModifyTilePriorities() {
  layer_tree_host_impl_->DidModifyTilePriorities();
}

void LayerTreeImpl::set_ui_resource_request_queue(
    const UIResourceRequestQueue& queue) {
  ui_resource_request_queue_ = queue;
}

ResourceProvider::ResourceId LayerTreeImpl::ResourceIdForUIResource(
    UIResourceId uid) const {
  return layer_tree_host_impl_->ResourceIdForUIResource(uid);
}

bool LayerTreeImpl::IsUIResourceOpaque(UIResourceId uid) const {
  return layer_tree_host_impl_->IsUIResourceOpaque(uid);
}

void LayerTreeImpl::ProcessUIResourceRequestQueue() {
  while (ui_resource_request_queue_.size() > 0) {
    UIResourceRequest req = ui_resource_request_queue_.front();
    ui_resource_request_queue_.pop_front();

    switch (req.GetType()) {
      case UIResourceRequest::UIResourceCreate:
        layer_tree_host_impl_->CreateUIResource(req.GetId(), req.GetBitmap());
        break;
      case UIResourceRequest::UIResourceDelete:
        layer_tree_host_impl_->DeleteUIResource(req.GetId());
        break;
      case UIResourceRequest::UIResourceInvalidRequest:
        NOTREACHED();
        break;
    }
  }

  // If all UI resource evictions were not recreated by processing this queue,
  // then another commit is required.
  if (layer_tree_host_impl_->EvictedUIResourcesExist())
    layer_tree_host_impl_->SetNeedsCommit();
}

void LayerTreeImpl::AddLayerWithCopyOutputRequest(LayerImpl* layer) {
  // Only the active tree needs to know about layers with copy requests, as
  // they are aborted if not serviced during draw.
  DCHECK(IsActiveTree());

  // DCHECK(std::find(layers_with_copy_output_request_.begin(),
  //                 layers_with_copy_output_request_.end(),
  //                 layer) == layers_with_copy_output_request_.end());
  // TODO(danakj): Remove this once crash is found crbug.com/309777
  for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
    CHECK(layers_with_copy_output_request_[i] != layer)
        << i << " of " << layers_with_copy_output_request_.size();
  }
  layers_with_copy_output_request_.push_back(layer);
}

void LayerTreeImpl::RemoveLayerWithCopyOutputRequest(LayerImpl* layer) {
  // Only the active tree needs to know about layers with copy requests, as
  // they are aborted if not serviced during draw.
  DCHECK(IsActiveTree());

  std::vector<LayerImpl*>::iterator it = std::find(
      layers_with_copy_output_request_.begin(),
      layers_with_copy_output_request_.end(),
      layer);
  DCHECK(it != layers_with_copy_output_request_.end());
  layers_with_copy_output_request_.erase(it);

  // TODO(danakj): Remove this once crash is found crbug.com/309777
  for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
    CHECK(layers_with_copy_output_request_[i] != layer)
        << i << " of " << layers_with_copy_output_request_.size();
  }
}

const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
    const {
  // Only the active tree needs to know about layers with copy requests, as
  // they are aborted if not serviced during draw.
  DCHECK(IsActiveTree());

  return layers_with_copy_output_request_;
}

}  // namespace cc
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root/cc/trees/layer_tree_impl.cc

DEFINITIONS
