Remove parts of //cc we aren't using

cc/resources/eviction_tile_priority_queue.cc

-// Copyright 2014 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/resources/eviction_tile_priority_queue.h"
-
-namespace cc {
-
-namespace {
-
-class EvictionOrderComparator {
- public:
-  explicit EvictionOrderComparator(TreePriority tree_priority)
-      : tree_priority_(tree_priority) {}
-
-  bool operator()(
-      const EvictionTilePriorityQueue::PairedTilingSetQueue* a,
-      const EvictionTilePriorityQueue::PairedTilingSetQueue* b) const {
-    // Note that in this function, we have to return true if and only if
-    // b is strictly lower priority than a. Note that for the sake of
-    // completeness, empty queue is considered to have lowest priority.
-    if (a->IsEmpty() || b->IsEmpty())
-      return b->IsEmpty() < a->IsEmpty();
-
-    WhichTree a_tree = a->NextTileIteratorTree();
-    const TilingSetEvictionQueue* a_queue =
-        a_tree == ACTIVE_TREE ? a->active_queue.get() : a->pending_queue.get();
-
-    WhichTree b_tree = b->NextTileIteratorTree();
-    const TilingSetEvictionQueue* b_queue =
-        b_tree == ACTIVE_TREE ? b->active_queue.get() : b->pending_queue.get();
-
-    const Tile* a_tile = a_queue->Top();
-    const Tile* b_tile = b_queue->Top();
-
-    const TilePriority& a_priority = a_tile->combined_priority();
-    const TilePriority& b_priority = b_tile->combined_priority();
-    bool prioritize_low_res = tree_priority_ == SMOOTHNESS_TAKES_PRIORITY;
-
-    // If the priority bin differs, b is lower priority if it has the higher
-    // priority bin.
-    if (a_priority.priority_bin != b_priority.priority_bin)
-      return b_priority.priority_bin > a_priority.priority_bin;
-
-    // Otherwise if the resolution differs, then the order will be determined by
-    // whether we prioritize low res or not.
-    // TODO(vmpstr): Remove this when TilePriority is no longer a member of Tile
-    // class but instead produced by the iterators.
-    if (b_priority.resolution != a_priority.resolution) {
-      // Non ideal resolution should be sorted higher than other resolutions.
-      if (a_priority.resolution == NON_IDEAL_RESOLUTION)
-        return false;
-
-      if (b_priority.resolution == NON_IDEAL_RESOLUTION)
-        return true;
-
-      if (prioritize_low_res)
-        return a_priority.resolution == LOW_RESOLUTION;
-      return a_priority.resolution == HIGH_RESOLUTION;
-    }
-
-    // Otherwise if the occlusion differs, b is lower priority if it is
-    // occluded.
-    bool a_is_occluded = a_tile->is_occluded_combined();
-    bool b_is_occluded = b_tile->is_occluded_combined();
-    if (a_is_occluded != b_is_occluded)
-      return b_is_occluded;
-
-    // b is lower priorty if it is farther from visible.
-    return b_priority.distance_to_visible > a_priority.distance_to_visible;
-  }
-
- private:
-  TreePriority tree_priority_;
-};
-
-}  // namespace
-
-EvictionTilePriorityQueue::EvictionTilePriorityQueue() {
-}
-
-EvictionTilePriorityQueue::~EvictionTilePriorityQueue() {
-}
-
-void EvictionTilePriorityQueue::Build(
-    const std::vector<PictureLayerImpl::Pair>& paired_layers,
-    TreePriority tree_priority) {
-  tree_priority_ = tree_priority;
-
-  for (std::vector<PictureLayerImpl::Pair>::const_iterator it =
-           paired_layers.begin();
-       it != paired_layers.end();
-       ++it) {
-    paired_queues_.push_back(
-        make_scoped_ptr(new PairedTilingSetQueue(*it, tree_priority_)));
-  }
-
-  paired_queues_.make_heap(EvictionOrderComparator(tree_priority_));
-}
-
-bool EvictionTilePriorityQueue::IsEmpty() const {
-  return paired_queues_.empty() || paired_queues_.front()->IsEmpty();
-}
-
-Tile* EvictionTilePriorityQueue::Top() {
-  DCHECK(!IsEmpty());
-  return paired_queues_.front()->Top();
-}
-
-void EvictionTilePriorityQueue::Pop() {
-  DCHECK(!IsEmpty());
-
-  paired_queues_.pop_heap(EvictionOrderComparator(tree_priority_));
-  PairedTilingSetQueue* paired_queue = paired_queues_.back();
-  paired_queue->Pop();
-  paired_queues_.push_heap(EvictionOrderComparator(tree_priority_));
-}
-
-EvictionTilePriorityQueue::PairedTilingSetQueue::PairedTilingSetQueue() {
-}
-
-EvictionTilePriorityQueue::PairedTilingSetQueue::PairedTilingSetQueue(
-    const PictureLayerImpl::Pair& layer_pair,
-    TreePriority tree_priority) {
-  bool skip_shared_out_of_order_tiles = layer_pair.active && layer_pair.pending;
-  if (layer_pair.active) {
-    active_queue = make_scoped_ptr(new TilingSetEvictionQueue(
-        layer_pair.active->picture_layer_tiling_set(), tree_priority,
-        skip_shared_out_of_order_tiles));
-  }
-  if (layer_pair.pending) {
-    pending_queue = make_scoped_ptr(new TilingSetEvictionQueue(
-        layer_pair.pending->picture_layer_tiling_set(), tree_priority,
-        skip_shared_out_of_order_tiles));
-  }
-}
-
-EvictionTilePriorityQueue::PairedTilingSetQueue::~PairedTilingSetQueue() {
-}
-
-bool EvictionTilePriorityQueue::PairedTilingSetQueue::IsEmpty() const {
-  return (!active_queue || active_queue->IsEmpty()) &&
-         (!pending_queue || pending_queue->IsEmpty());
-}
-
-Tile* EvictionTilePriorityQueue::PairedTilingSetQueue::Top() {
-  DCHECK(!IsEmpty());
-
-  WhichTree next_tree = NextTileIteratorTree();
-  TilingSetEvictionQueue* next_queue =
-      next_tree == ACTIVE_TREE ? active_queue.get() : pending_queue.get();
-  DCHECK(next_queue && !next_queue->IsEmpty());
-
-  Tile* tile = next_queue->Top();
-  DCHECK(returned_tiles_for_debug.find(tile) == returned_tiles_for_debug.end());
-  return tile;
-}
-
-void EvictionTilePriorityQueue::PairedTilingSetQueue::Pop() {
-  DCHECK(!IsEmpty());
-
-  WhichTree next_tree = NextTileIteratorTree();
-  TilingSetEvictionQueue* next_queue =
-      next_tree == ACTIVE_TREE ? active_queue.get() : pending_queue.get();
-  DCHECK(next_queue && !next_queue->IsEmpty());
-  DCHECK(returned_tiles_for_debug.insert(next_queue->Top()).second);
-  next_queue->Pop();
-
-  // If not empty, use Top to DCHECK the next iterator.
-  DCHECK_IMPLIES(!IsEmpty(), Top());
-}
-
-WhichTree
-EvictionTilePriorityQueue::PairedTilingSetQueue::NextTileIteratorTree() const {
-  DCHECK(!IsEmpty());
-
-  // If we only have one iterator with tiles, return it.
-  if (!active_queue || active_queue->IsEmpty())
-    return PENDING_TREE;
-  if (!pending_queue || pending_queue->IsEmpty())
-    return ACTIVE_TREE;
-
-  const Tile* active_tile = active_queue->Top();
-  const Tile* pending_tile = pending_queue->Top();
-
-  // If tiles are the same, it doesn't matter which tree we return.
-  if (active_tile == pending_tile)
-    return ACTIVE_TREE;
-
-  const TilePriority& active_priority = active_tile->combined_priority();
-  const TilePriority& pending_priority = pending_tile->combined_priority();
-
-  // If the bins are the same and activation differs, then return the tree of
-  // the tile not required for activation.
-  if (active_priority.priority_bin == pending_priority.priority_bin &&
-      active_tile->required_for_activation() !=
-          pending_tile->required_for_activation()) {
-    return active_tile->required_for_activation() ? PENDING_TREE : ACTIVE_TREE;
-  }
-
-  // Return tile with a lower priority.
-  if (pending_priority.IsHigherPriorityThan(active_priority))
-    return ACTIVE_TREE;
-  return PENDING_TREE;
-}
-
-}  // namespace cc