Part 10 of cc/ directory shuffles: layers

cc/layer_iterator.cc

-// 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/layer_iterator.h"
-
-#include "cc/layer.h"
-#include "cc/layer_impl.h"
-#include "cc/render_surface.h"
-#include "cc/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.m_targetRenderSurfaceLayerIndex = 0;
-    it.m_currentLayerIndex = LayerIteratorValue::LayerIndexRepresentingTargetRenderSurface;
-
-    m_highestTargetRenderSurfaceLayer = 0;
-}
-
-template <typename LayerType, typename LayerList, typename RenderSurfaceType, typename ActionType>
-void LayerIteratorActions::BackToFront::end(LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>& it)
-{
-    it.m_targetRenderSurfaceLayerIndex = LayerIteratorValue::InvalidTargetRenderSurfaceLayerIndex;
-    it.m_currentLayerIndex = 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.currentLayerRepresentsContributingRenderSurface()) {
-        // Save our position in the childLayer list for the RenderSurfaceImpl, then jump to the next RenderSurfaceImpl. Save where we
-        // came from in the next RenderSurfaceImpl so we can get back to it.
-        it.targetRenderSurface()->current_layer_index_history_ = it.m_currentLayerIndex;
-        int previousTargetRenderSurfaceLayer = it.m_targetRenderSurfaceLayerIndex;
-
-        it.m_targetRenderSurfaceLayerIndex = ++m_highestTargetRenderSurfaceLayer;
-        it.m_currentLayerIndex = LayerIteratorValue::LayerIndexRepresentingTargetRenderSurface;
-
-        it.targetRenderSurface()->target_render_surface_layer_index_history_ = previousTargetRenderSurfaceLayer;
-    } else {
-        ++it.m_currentLayerIndex;
-
-        int targetRenderSurfaceNumChildren = it.targetRenderSurfaceChildren().size();
-        while (it.m_currentLayerIndex == targetRenderSurfaceNumChildren) {
-            // Jump back to the previous RenderSurfaceImpl, and get back the position where we were in that list, and move to the next position there.
-            if (!it.m_targetRenderSurfaceLayerIndex) {
-                // End of the list
-                it.m_targetRenderSurfaceLayerIndex = LayerIteratorValue::InvalidTargetRenderSurfaceLayerIndex;
-                it.m_currentLayerIndex = 0;
-                return;
-            }
-            it.m_targetRenderSurfaceLayerIndex = it.targetRenderSurface()->target_render_surface_layer_index_history_;
-            it.m_currentLayerIndex = it.targetRenderSurface()->current_layer_index_history_ + 1;
-
-            targetRenderSurfaceNumChildren = it.targetRenderSurfaceChildren().size();
-        }
-    }
-}
-
-template <typename LayerType, typename LayerList, typename RenderSurfaceType, typename ActionType>
-void LayerIteratorActions::FrontToBack::begin(LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>& it)
-{
-    it.m_targetRenderSurfaceLayerIndex = 0;
-    it.m_currentLayerIndex = it.targetRenderSurfaceChildren().size() - 1;
-    goToHighestInSubtree(it);
-}
-
-template <typename LayerType, typename LayerList, typename RenderSurfaceType, typename ActionType>
-void LayerIteratorActions::FrontToBack::end(LayerIterator<LayerType, LayerList, RenderSurfaceType, ActionType>& it)
-{
-    it.m_targetRenderSurfaceLayerIndex = LayerIteratorValue::InvalidTargetRenderSurfaceLayerIndex;
-    it.m_currentLayerIndex = 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.currentLayerRepresentsTargetRenderSurface()) {
-        // Subtracting one here will eventually cause the current layer to become that layer
-        // representing the target render surface.
-        --it.m_currentLayerIndex;
-        goToHighestInSubtree(it);
-    } else {
-        while (it.currentLayerRepresentsTargetRenderSurface()) {
-            if (!it.m_targetRenderSurfaceLayerIndex) {
-                // End of the list
-                it.m_targetRenderSurfaceLayerIndex = LayerIteratorValue::InvalidTargetRenderSurfaceLayerIndex;
-                it.m_currentLayerIndex = 0;
-                return;
-            }
-            it.m_targetRenderSurfaceLayerIndex = it.targetRenderSurface()->target_render_surface_layer_index_history_;
-            it.m_currentLayerIndex = it.targetRenderSurface()->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.currentLayerRepresentsTargetRenderSurface())
-        return;
-    while (it.currentLayerRepresentsContributingRenderSurface()) {
-        // 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.targetRenderSurface()->current_layer_index_history_ = it.m_currentLayerIndex;
-        int previousTargetRenderSurfaceLayer = it.m_targetRenderSurfaceLayerIndex;
-
-        for (LayerType* layer = it.currentLayer(); it.targetRenderSurfaceLayer() != layer; ++it.m_targetRenderSurfaceLayerIndex) { }
-        it.m_currentLayerIndex = it.targetRenderSurfaceChildren().size() - 1;
-
-        it.targetRenderSurface()->target_render_surface_layer_index_history_ = previousTargetRenderSurfaceLayer;
-    }
-}
-
-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> &);
-template CC_EXPORT void LayerIteratorActions::BackToFront::end(LayerIterator<Layer, LayerList, RenderSurface, BackToFront>&);
-template CC_EXPORT void LayerIteratorActions::BackToFront::next(LayerIterator<Layer, LayerList, RenderSurface, BackToFront>&);
-
-template CC_EXPORT void LayerIteratorActions::BackToFront::begin(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>&);
-template CC_EXPORT void LayerIteratorActions::BackToFront::end(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>&);
-template CC_EXPORT void LayerIteratorActions::BackToFront::next(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, BackToFront>&);
-
-template CC_EXPORT void LayerIteratorActions::FrontToBack::next(LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::end(LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::begin(LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::goToHighestInSubtree(LayerIterator<Layer, LayerList, RenderSurface, FrontToBack>&);
-
-template CC_EXPORT void LayerIteratorActions::FrontToBack::next(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::end(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::begin(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>&);
-template CC_EXPORT void LayerIteratorActions::FrontToBack::goToHighestInSubtree(LayerIterator<LayerImpl, LayerImplList, RenderSurfaceImpl, FrontToBack>&);
-
-}  // namespace cc