| // 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/layers/layer_iterator.h" |
| |
| #include <vector> |
| |
| #include "cc/layers/layer.h" |
| #include "cc/layers/layer_impl.h" |
| #include "cc/layers/render_surface.h" |
| #include "cc/layers/render_surface_impl.h" |
| |
| namespace cc { |
| |
| template <typename LayerType, |
| typename LayerList, |
| typename RenderSurfaceType, |
| typename ActionType> |
| void LayerIteratorActions::FrontToBack::Begin( |
| LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) { |
| it->target_render_surface_layer_index_ = 0; |
| it->current_layer_index_ = it->target_render_surface_children().size() - 1; |
| GoToHighestInSubtree(it); |
| } |
| |
| template <typename LayerType, |
| typename LayerList, |
| typename RenderSurfaceType, |
| typename ActionType> |
| void LayerIteratorActions::FrontToBack::End( |
| LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) { |
| it->target_render_surface_layer_index_ = |
| LayerIteratorValue::kInvalidTargetRenderSurfaceLayerIndex; |
| it->current_layer_index_ = 0; |
| } |
| |
| template <typename LayerType, |
| typename LayerList, |
| typename RenderSurfaceType, |
| typename ActionType> |
| void LayerIteratorActions::FrontToBack::Next( |
| LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) { |
| // Moves to the previous layer in the current RS layer list. |
| // Then we check if the new current layer has its own RS, |
| // in which case there are things in that RS layer list that are higher, |
| // so we find the highest layer in that subtree. |
| // If we move back past the front of the list, |
| // we jump up to the previous RS layer list, picking up again where we |
| // had previously recursed into the current RS layer list. |
| |
| if (!it->current_layer_represents_target_render_surface()) { |
| // Subtracting one here will eventually cause the current layer |
| // to become that layer representing the target render surface. |
| --it->current_layer_index_; |
| GoToHighestInSubtree(it); |
| } else { |
| while (it->current_layer_represents_target_render_surface()) { |
| if (!it->target_render_surface_layer_index_) { |
| // End of the list |
| it->target_render_surface_layer_index_ = |
| LayerIteratorValue::kInvalidTargetRenderSurfaceLayerIndex; |
| it->current_layer_index_ = 0; |
| return; |
| } |
| it->target_render_surface_layer_index_ = it->target_render_surface() |
| ->target_render_surface_layer_index_history_; |
| it->current_layer_index_ = |
| it->target_render_surface()->current_layer_index_history_; |
| } |
| } |
| } |
| |
| template <typename LayerType, |
| typename LayerList, |
| typename RenderSurfaceType, |
| typename ActionType> |
| void LayerIteratorActions::FrontToBack::GoToHighestInSubtree( |
| LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) { |
| if (it->current_layer_represents_target_render_surface()) |
| return; |
| while (it->current_layer_represents_contributing_render_surface()) { |
| // Save where we were in the current target surface, move to the next one, |
| // and save the target surface that we came from there |
| // so we can go back to it. |
| it->target_render_surface()->current_layer_index_history_ = |
| it->current_layer_index_; |
| int previous_target_render_surface_layer = |
| it->target_render_surface_layer_index_; |
| |
| for (LayerType* layer = it->current_layer(); |
| it->target_render_surface_layer() != layer; |
| ++it->target_render_surface_layer_index_) { |
| } |
| it->current_layer_index_ = it->target_render_surface_children().size() - 1; |
| |
| it->target_render_surface()->target_render_surface_layer_index_history_ = |
| previous_target_render_surface_layer; |
| } |
| } |
| |
| // Declare each of the above functions for Layer and LayerImpl classes |
| // so that they are linked. |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::Next( |
| LayerIterator<Layer, RenderSurfaceLayerList, RenderSurface, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::End( |
| LayerIterator<Layer, RenderSurfaceLayerList, RenderSurface, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::Begin( |
| LayerIterator<Layer, RenderSurfaceLayerList, RenderSurface, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::GoToHighestInSubtree( |
| LayerIterator<Layer, RenderSurfaceLayerList, RenderSurface, FrontToBack>* |
| it); |
| |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::Next( |
| LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::End( |
| LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::Begin( |
| LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>* |
| it); |
| template CC_EXPORT void LayerIteratorActions::FrontToBack::GoToHighestInSubtree( |
| LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>* |
| it); |
| |
| } // namespace cc |