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// 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
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