cc: Clean up iterator template to only take 1 parameter.

cc/layers/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/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