cc: Move RenderTarget Information to Effect Tree

cc/trees/draw_property_utils.cc

 // Copyright 2014 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/draw_property_utils.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 412 matching lines @@
 }
 
 template <typename LayerType>
 void UpdateRenderSurfaceForLayer(EffectTree* effect_tree,
                                  bool non_root_surfaces_enabled,
                                  LayerType* layer) {
   if (!non_root_surfaces_enabled) {
     layer->SetHasRenderSurface(IsRootLayer(layer));
     return;
   }
+
   EffectNode* node = effect_tree->Node(layer->effect_tree_index());
 
   if (node->owner_id == layer->id() && node->data.has_render_surface)
     layer->SetHasRenderSurface(true);
   else
     layer->SetHasRenderSurface(false);
 }
 
 void UpdateRenderSurfacesForLayersRecursive(EffectTree* effect_tree,
                                             Layer* layer) {
@@ skipping 151 matching lines @@
 }
 
 void ComputeTransforms(TransformTree* transform_tree) {
   if (!transform_tree->needs_update())
     return;
   for (int i = 1; i < static_cast<int>(transform_tree->size()); ++i)
     transform_tree->UpdateTransforms(i);
   transform_tree->set_needs_update(false);
 }
 
+void UpdateRenderTarget(EffectTree* effect_tree,
+                        bool can_render_to_separate_surface) {
+  for (int i = 1; i < static_cast<int>(effect_tree->size()); ++i) {
+    EffectNode* node = effect_tree->Node(i);
+    if (i == 1) {
+      // Render target on the first effect node is root.
+      node->data.target_id = 0;
+    } else if (!can_render_to_separate_surface) {
+      node->data.target_id = 1;
+    } else if (effect_tree->parent(node)->data.has_render_surface) {
+      node->data.target_id = node->parent_id;
+    } else {
+      node->data.target_id = effect_tree->parent(node)->data.target_id;
+    }
+  }
+}
+
 void ComputeEffects(EffectTree* effect_tree) {
   if (!effect_tree->needs_update())
     return;
   for (int i = 1; i < static_cast<int>(effect_tree->size()); ++i)
     effect_tree->UpdateEffects(i);
   effect_tree->set_needs_update(false);
 }
 
 static void ComputeVisibleRectsInternal(
     LayerImpl* root_layer,
     PropertyTrees* property_trees,
     bool can_render_to_separate_surface,
     LayerImplList* update_layer_list,
     std::vector<LayerImpl*>* visible_layer_list) {
   if (property_trees->non_root_surfaces_enabled !=
       can_render_to_separate_surface) {
     property_trees->non_root_surfaces_enabled = can_render_to_separate_surface;
     property_trees->transform_tree.set_needs_update(true);
   }
   if (property_trees->transform_tree.needs_update())
     property_trees->clip_tree.set_needs_update(true);
+  UpdateRenderTarget(&property_trees->effect_tree,
+                     property_trees->non_root_surfaces_enabled);
   ComputeTransforms(&property_trees->transform_tree);
   ComputeClips(&property_trees->clip_tree, property_trees->transform_tree,
                can_render_to_separate_surface);
   ComputeEffects(&property_trees->effect_tree);
 
   FindLayersThatNeedUpdates(root_layer, property_trees->transform_tree,
                             property_trees->effect_tree, update_layer_list,
                             visible_layer_list);
   CalculateVisibleRects<LayerImpl>(
       *visible_layer_list, property_trees->clip_tree,
@@ skipping 81 matching lines @@
                       can_render_to_separate_surface, visible_layer_list);
 }
 
 void ComputeVisibleRects(LayerImpl* root_layer,
                          PropertyTrees* property_trees,
                          bool can_render_to_separate_surface,
                          LayerImplList* visible_layer_list) {
   for (auto* layer : *root_layer->layer_tree_impl()) {
     UpdateRenderSurfaceForLayer(&property_trees->effect_tree,
                                 can_render_to_separate_surface, layer);
+    EffectNode* node =
+        property_trees->effect_tree.Node(layer->effect_tree_index());
+    if (node->owner_id == layer->id())
+      node->data.render_surface = layer->render_surface();
 #if DCHECK_IS_ON()
     if (can_render_to_separate_surface)
       ValidateRenderSurfaceForLayer(layer);
 #endif
   }
   LayerImplList update_layer_list;
   ComputeVisibleRectsInternal(root_layer, property_trees,
                               can_render_to_separate_surface,
                               &update_layer_list, visible_layer_list);
 }
@@ skipping 167 matching lines @@
                                     const TransformTree& tree) {
   return ScreenSpaceTransformInternal(layer,
                                       tree.Node(layer->transform_tree_index()));
 }
 
 static float LayerDrawOpacity(const LayerImpl* layer, const EffectTree& tree) {
   if (!layer->render_target())
     return 0.f;
 
   const EffectNode* target_node =
-      tree.Node(layer->render_target()->effect_tree_index());
+      tree.Node(layer->render_target()->EffectTreeIndex());
   const EffectNode* node = tree.Node(layer->effect_tree_index());
   if (node == target_node)
     return 1.f;
 
   float draw_opacity = 1.f;
   while (node != target_node) {
     draw_opacity *= node->data.opacity;
     node = tree.parent(node);
   }
   return draw_opacity;
@@ skipping 241 matching lines @@
 void UpdateElasticOverscroll(PropertyTrees* property_trees,
                              const Layer* overscroll_elasticity_layer,
                              const gfx::Vector2dF& elastic_overscroll) {
   UpdateElasticOverscrollInternal(property_trees, overscroll_elasticity_layer,
                                   elastic_overscroll);
 }
 
 }  // namespace draw_property_utils
 
 }  // namespace cc