cc: Move gpu rasterization flag from LayerImpl to LayerTreeImpl.

cc/trees/layer_tree_impl.cc

 // 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/animation/scrollbar_animation_controller_linear_fade.h"
@@ skipping 74 matching lines @@
       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),
+      use_gpu_rasterization_(false),
       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),
       render_surface_layer_list_id_(0) {
 }
 
 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::ReleaseResources() {
+  if (root_layer_)
+    ReleaseResourcesRecursive(root_layer_.get());
+}
+
 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;
@@ skipping 90 matching lines @@
                                      : 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());
 
+  target_tree->use_gpu_rasterization_ = use_gpu_rasterization();
+
   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())
@@ skipping 197 matching lines @@
                                            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::SetUseGpuRasterization(bool use_gpu) {
+  if (use_gpu == use_gpu_rasterization_)
+    return;
+
+  use_gpu_rasterization_ = use_gpu;
+  ReleaseResources();
+}
+
 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;
@@ skipping 538 matching lines @@
 
 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_;
 }
 
+void LayerTreeImpl::ReleaseResourcesRecursive(LayerImpl* current) {
+  DCHECK(current);
+  current->ReleaseResources();
+  if (current->mask_layer())
+    ReleaseResourcesRecursive(current->mask_layer());
+  if (current->replica_layer())
+    ReleaseResourcesRecursive(current->replica_layer());
+  for (size_t i = 0; i < current->children().size(); ++i)
+    ReleaseResourcesRecursive(current->children()[i]);
+}
+
 }  // namespace cc