Remove parts of //cc we aren't using

cc/resources/pixel_ref_map.cc

-// Copyright 2015 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/pixel_ref_map.h"
-
-#include <algorithm>
-#include <limits>
-
-#include "cc/base/util.h"
-#include "cc/resources/picture.h"
-#include "skia/ext/pixel_ref_utils.h"
-
-namespace cc {
-
-PixelRefMap::PixelRefMap(const gfx::Size& cell_size) : cell_size_(cell_size) {
-  DCHECK(!cell_size.IsEmpty());
-}
-
-PixelRefMap::~PixelRefMap() {
-}
-
-void PixelRefMap::GatherPixelRefsFromPicture(SkPicture* picture) {
-  DCHECK(picture);
-
-  int min_x = std::numeric_limits<int>::max();
-  int min_y = std::numeric_limits<int>::max();
-  int max_x = 0;
-  int max_y = 0;
-
-  skia::DiscardablePixelRefList pixel_refs;
-  skia::PixelRefUtils::GatherDiscardablePixelRefs(picture, &pixel_refs);
-  for (skia::DiscardablePixelRefList::const_iterator it = pixel_refs.begin();
-       it != pixel_refs.end(); ++it) {
-    gfx::Point min(
-        RoundDown(static_cast<int>(it->pixel_ref_rect.x()), cell_size_.width()),
-        RoundDown(static_cast<int>(it->pixel_ref_rect.y()),
-                  cell_size_.height()));
-    gfx::Point max(
-        RoundDown(static_cast<int>(std::ceil(it->pixel_ref_rect.right())),
-                  cell_size_.width()),
-        RoundDown(static_cast<int>(std::ceil(it->pixel_ref_rect.bottom())),
-                  cell_size_.height()));
-
-    for (int y = min.y(); y <= max.y(); y += cell_size_.height()) {
-      for (int x = min.x(); x <= max.x(); x += cell_size_.width()) {
-        PixelRefMapKey key(x, y);
-        data_hash_map_[key].push_back(it->pixel_ref);
-      }
-    }
-
-    min_x = std::min(min_x, min.x());
-    min_y = std::min(min_y, min.y());
-    max_x = std::max(max_x, max.x());
-    max_y = std::max(max_y, max.y());
-  }
-
-  min_pixel_cell_ = gfx::Point(min_x, min_y);
-  max_pixel_cell_ = gfx::Point(max_x, max_y);
-}
-
-base::LazyInstance<PixelRefs> PixelRefMap::Iterator::empty_pixel_refs_;
-
-PixelRefMap::Iterator::Iterator()
-    : target_pixel_ref_map_(NULL),
-      current_pixel_refs_(empty_pixel_refs_.Pointer()),
-      current_index_(0),
-      min_point_(-1, -1),
-      max_point_(-1, -1),
-      current_x_(0),
-      current_y_(0) {
-}
-
-PixelRefMap::Iterator::Iterator(const gfx::Rect& rect, const Picture* picture)
-    : target_pixel_ref_map_(&(picture->pixel_refs_)),
-      current_pixel_refs_(empty_pixel_refs_.Pointer()),
-      current_index_(0) {
-  gfx::Rect layer_rect = picture->layer_rect_;
-  gfx::Size cell_size = target_pixel_ref_map_->cell_size_;
-  DCHECK(!cell_size.IsEmpty());
-  gfx::Rect query_rect(rect);
-  // Early out if the query rect doesn't intersect this picture.
-  if (!query_rect.Intersects(layer_rect)) {
-    min_point_ = gfx::Point(0, 0);
-    max_point_ = gfx::Point(0, 0);
-    current_x_ = 1;
-    current_y_ = 1;
-    return;
-  }
-
-  // First, subtract the layer origin as cells are stored in layer space.
-  query_rect.Offset(-layer_rect.OffsetFromOrigin());
-
-  // We have to find a cell_size aligned point that corresponds to
-  // query_rect. Point is a multiple of cell_size.
-  min_point_ = gfx::Point(RoundDown(query_rect.x(), cell_size.width()),
-                          RoundDown(query_rect.y(), cell_size.height()));
-  max_point_ =
-      gfx::Point(RoundDown(query_rect.right() - 1, cell_size.width()),
-                 RoundDown(query_rect.bottom() - 1, cell_size.height()));
-
-  // Limit the points to known pixel ref boundaries.
-  min_point_ = gfx::Point(
-      std::max(min_point_.x(), target_pixel_ref_map_->min_pixel_cell_.x()),
-      std::max(min_point_.y(), target_pixel_ref_map_->min_pixel_cell_.y()));
-  max_point_ = gfx::Point(
-      std::min(max_point_.x(), target_pixel_ref_map_->max_pixel_cell_.x()),
-      std::min(max_point_.y(), target_pixel_ref_map_->max_pixel_cell_.y()));
-
-  // Make the current x be cell_size.width() less than min point, so that
-  // the first increment will point at min_point_.
-  current_x_ = min_point_.x() - cell_size.width();
-  current_y_ = min_point_.y();
-  if (current_y_ <= max_point_.y())
-    ++(*this);
-}
-
-PixelRefMap::Iterator::~Iterator() {
-}
-
-PixelRefMap::Iterator& PixelRefMap::Iterator::operator++() {
-  ++current_index_;
-  // If we're not at the end of the list, then we have the next item.
-  if (current_index_ < current_pixel_refs_->size())
-    return *this;
-
-  DCHECK(current_y_ <= max_point_.y());
-  while (true) {
-    gfx::Size cell_size = target_pixel_ref_map_->cell_size_;
-
-    // Advance the current grid cell.
-    current_x_ += cell_size.width();
-    if (current_x_ > max_point_.x()) {
-      current_y_ += cell_size.height();
-      current_x_ = min_point_.x();
-      if (current_y_ > max_point_.y()) {
-        current_pixel_refs_ = empty_pixel_refs_.Pointer();
-        current_index_ = 0;
-        break;
-      }
-    }
-
-    // If there are no pixel refs at this grid cell, keep incrementing.
-    PixelRefMapKey key(current_x_, current_y_);
-    PixelRefHashmap::const_iterator iter =
-        target_pixel_ref_map_->data_hash_map_.find(key);
-    if (iter == target_pixel_ref_map_->data_hash_map_.end())
-      continue;
-
-    // We found a non-empty list: store it and get the first pixel ref.
-    current_pixel_refs_ = &iter->second;
-    current_index_ = 0;
-    break;
-  }
-  return *this;
-}
-
-}  // namespace cc