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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 "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::BackToFront::Begin(
LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) {
it->target_render_surface_layer_index_ = 0;
it->current_layer_index_ =
LayerIteratorValue::kLayerIndexRepresentingTargetRenderSurface;
highest_target_render_surface_layer_ = 0;
}
template <typename LayerType,
typename LayerList,
typename RenderSurfaceType,
typename ActionType>
void LayerIteratorActions::BackToFront::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::BackToFront::Next(
LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>* it) {
// If the current layer has a RS, move to its layer list. Otherwise,
// visit the next layer in the current RS layer list.
if (it->current_layer_represents_contributing_render_surface()) {
// Save our position in the childLayer list for the RenderSurface,
// then jump to the next RenderSurface. Save where we
// came from in the next RenderSurface so we can get 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_;
it->target_render_surface_layer_index_ =
++highest_target_render_surface_layer_;
it->current_layer_index_ =
LayerIteratorValue::kLayerIndexRepresentingTargetRenderSurface;
it->target_render_surface()->target_render_surface_layer_index_history_ =
previous_target_render_surface_layer;
} else {
++it->current_layer_index_;
int target_render_surface_num_children =
it->target_render_surface_children().size();
while (it->current_layer_index_ == target_render_surface_num_children) {
// Jump back to the previous RenderSurface,
// and get back the position where we were in that list,
// and move to the next position there.
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_ + 1;
target_render_surface_num_children =
it->target_render_surface_children().size();
}
}
}
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;
}
}
typedef std::vector<scoped_refptr<Layer> > LayerList;
typedef std::vector<LayerImpl*> LayerImplList;
// Declare each of the above functions for Layer and LayerImpl classes
// so that they are linked.
template CC_EXPORT void LayerIteratorActions::BackToFront::Begin(
LayerIterator<Layer, LayerList, RenderSurface, BackToFront>* it);
template CC_EXPORT void LayerIteratorActions::BackToFront::End(
LayerIterator<Layer, LayerList, RenderSurface, BackToFront>* it);
template CC_EXPORT void LayerIteratorActions::BackToFront::Next(
LayerIterator<Layer, LayerList, RenderSurface, BackToFront>* it);
template CC_EXPORT void LayerIteratorActions::BackToFront::Begin(
LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>*
it);
template CC_EXPORT void LayerIteratorActions::BackToFront::End(
LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>*
it);
template CC_EXPORT void LayerIteratorActions::BackToFront::Next(
LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>*
it);
template CC_EXPORT void LayerIteratorActions::FrontToBack::Next(
LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>* it);
template CC_EXPORT void LayerIteratorActions::FrontToBack::End(
LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>* it);
template CC_EXPORT void LayerIteratorActions::FrontToBack::Begin(
LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>* it);
template CC_EXPORT void LayerIteratorActions::FrontToBack::GoToHighestInSubtree(
LayerIterator<Layer, LayerList, 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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