cc: Add PictureLayerTilingSet to manage PictureLayerTiling

cc/picture_layer_tiling_set.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/picture_layer_tiling_set.h"
+
+namespace cc {
+
+PictureLayerTilingSet::PictureLayerTilingSet(
+    PictureLayerTilingClient * client)
+    : client_(client) {
+}
+
+PictureLayerTilingSet::~PictureLayerTilingSet() {
+}
+
+void PictureLayerTilingSet::CloneFrom(const PictureLayerTilingSet& other) {
+  layer_bounds_ = other.layer_bounds_;
+  tilings_.clear();
+  tilings_.reserve(other.tilings_.size());
+  for (size_t i = 0; i < other.tilings_.size(); ++i) {
+    tilings_.append(other.tilings_[i]->Clone());
+  }
+}
+
+void PictureLayerTilingSet::SetLayerBounds(gfx::Size layer_bounds) {
+  layer_bounds_ = layer_bounds;
+  for (size_t i = 0; i < tilings_.size(); ++i)
+    tilings_[i]->SetLayerBounds(layer_bounds);
+}
+
+gfx::Size PictureLayerTilingSet::LayerBounds() const {
+  return layer_bounds_;
+}
+
+void PictureLayerTilingSet::Invalidate(const Region& invalidation) {
+  for (size_t i = 0; i < tilings_.size(); ++i)
+    tilings_[i]->Invalidate(invalidation);
+}
+
+void PictureLayerTilingSet::AddTiling(float contents_scale,
+                                      gfx::Size tile_size) {
+  tilings_.append(PictureLayerTiling::Create(contents_scale, tile_size));
+  tilings_.last()->SetClient(client_);
+  tilings_.last()->SetLayerBounds(layer_bounds_);
+}
+
+PictureLayerTilingSet::Iterator::Iterator(PictureLayerTilingSet* set,
+                                          float contents_scale,
+                                          gfx::Rect content_rect)
+    : set_(set),
+      contents_scale_(contents_scale),
+      current_tiling_(-1) {
+  missing_region_.Union(content_rect);
+  ++(*this);
+}
+
+PictureLayerTilingSet::Iterator::~Iterator() {
+}
+
+gfx::Rect PictureLayerTilingSet::Iterator::geometry_rect() const {
+  if (!tiling_iter_) {
+    if (!region_iter_.has_rect())
+      return gfx::Rect();
+    return region_iter_.rect();
+  }
+  return tiling_iter_.geometry_rect();
+}
+
+gfx::RectF PictureLayerTilingSet::Iterator::texture_rect() const {
+  if (!tiling_iter_)
+    return gfx::RectF();
+  return tiling_iter_.texture_rect();
+}
+
+gfx::Size PictureLayerTilingSet::Iterator::texture_size() const {
+  if (!tiling_iter_)
+    return gfx::Size();
+  return tiling_iter_.texture_size();
+}
+
+Tile* PictureLayerTilingSet::Iterator::operator->() const {
+  if (!tiling_iter_)
+    return NULL;
+  return *tiling_iter_;
+}
+
+Tile* PictureLayerTilingSet::Iterator::operator*() const {
+  if (!tiling_iter_)
+    return NULL;
+  return *tiling_iter_;
+}
+
+PictureLayerTilingSet::Iterator& PictureLayerTilingSet::Iterator::operator++() {
+  bool first_time = current_tiling_ < 0;
+
+  if (!*this && !first_time)
+    return *this;
+
+  if (tiling_iter_)
+    ++tiling_iter_;
+
+  // Loop until we find a valid place to stop.
+  while (true) {
+    while (tiling_iter_ && !tiling_iter_->resource_id()) {
+      missing_region_.Union(tiling_iter_.geometry_rect());
+      ++tiling_iter_;
+    }
+    if (tiling_iter_)
+      return *this;
+
+    // If the set of current rects for this tiling is done, go to the next
+    // tiling and set up to iterate through all of the remaining holes.
+    // This will also happen the first time through the loop.
+    if (!region_iter_.has_rect()) {
+      current_tiling_++;
+      current_region_.Swap(missing_region_);
+      missing_region_.Clear();
+      region_iter_ = Region::Iterator(current_region_);
+
+      // All done and all filled.
+      if (!region_iter_.has_rect()) {
+        current_tiling_ = set_->tilings_.size();
+        return *this;
+      }
+
+      // No more valid tiles, return this checkerboard rect.
+      if (current_tiling_ >= static_cast<int>(set_->tilings_.size()))
+        return *this;
+    }
+
+    // Pop a rect off.  If there are no more tilings, then these will be
+    // treated as geometry with null tiles that the caller can checkerboard.
+    gfx::Rect last_rect = region_iter_.rect();
+    region_iter_.next();
+
+    // Done, found next checkerboard rect to return.
+    if (current_tiling_ >= static_cast<int>(set_->tilings_.size()))
+      return *this;
+
+    // Construct a new iterator for the next tiling, but we need to loop
+    // again until we get to a valid one.
+    tiling_iter_ = PictureLayerTiling::Iterator(
+        set_->tilings_[current_tiling_],
+        contents_scale_,
+        last_rect);
+  }
+
+  return *this;
+}
+
+PictureLayerTilingSet::Iterator::operator bool() const {
+  return current_tiling_ < static_cast<int>(set_->tilings_.size()) ||
+      region_iter_.has_rect();
+}
+
+}  // namespace cc