cc/playback/display_item_list_bounds_calculator.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/playback/display_item_list_bounds_calculator.h"

#include "base/logging.h"
#include "ui/gfx/skia_util.h"

namespace cc {

DisplayItemListBoundsCalculator::DisplayItemListBoundsCalculator() {
  matrix_stack_.push_back(SkMatrix::I());
}

DisplayItemListBoundsCalculator::~DisplayItemListBoundsCalculator() {}

void DisplayItemListBoundsCalculator::AddStartingDisplayItem() {
  bounds_.push_back(gfx::RectF());
  started_items_indices_.push_back(bounds_.size() - 1);
}

void DisplayItemListBoundsCalculator::AddEndingDisplayItem() {
  size_t last_start_index = started_items_indices_.back();
  started_items_indices_.pop_back();

  // Ending bounds match the starting bounds.
  bounds_.push_back(bounds_[last_start_index]);

  // The block that ended just now needs to be considered in the bounds of the
  // enclosing block.
  if (!started_items_indices_.empty())
    bounds_[started_items_indices_.back()].Union(bounds_.back());
}

void DisplayItemListBoundsCalculator::AddDisplayItemWithBounds(
    const SkRect& rect) {
  SkRect target_rect;
  matrix()->mapRect(&target_rect, rect);
  bounds_.push_back(gfx::SkRectToRectF(target_rect));
  if (!started_items_indices_.empty())
    bounds_[started_items_indices_.back()].Union(bounds_.back());
}

void DisplayItemListBoundsCalculator::Save() {
  matrix_stack_.push_back(matrix_stack_.back());
}

void DisplayItemListBoundsCalculator::Restore() {
  DCHECK_GT(matrix_stack_.size(), 1u);
  matrix_stack_.pop_back();
}

void DisplayItemListBoundsCalculator::Finalize() {
  while (!started_items_indices_.empty()) {
    bounds_[started_items_indices_.back()].Union(bounds_.back());
    started_items_indices_.pop_back();
  }
}

}  // namespace cc