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- // Copyright 2018 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 "ui/aura/window_occlusion_change_builder.h"
- #include "base/check_op.h"
- #include "base/containers/flat_map.h"
- #include "components/viz/client/frame_eviction_manager.h"
- #include "third_party/skia/include/core/SkRegion.h"
- #include "ui/aura/window_tracker.h"
- namespace aura {
- // Provide updating of occlusion info on aura::Window.
- class DefaultWindowOcclusionChangeBuilder
- : public WindowOcclusionChangeBuilder {
- public:
- DefaultWindowOcclusionChangeBuilder() = default;
- DefaultWindowOcclusionChangeBuilder(
- const DefaultWindowOcclusionChangeBuilder&) = delete;
- DefaultWindowOcclusionChangeBuilder& operator=(
- const DefaultWindowOcclusionChangeBuilder&) = delete;
- ~DefaultWindowOcclusionChangeBuilder() override {
- // No frame eviction until all occlusion state changes are applied.
- viz::FrameEvictionManager::ScopedPause scoped_frame_eviction_pause;
- while (!windows_.windows().empty()) {
- Window* window = windows_.Pop();
- auto it = changes_.find(window);
- if (it == changes_.end())
- continue;
- window->SetOcclusionInfo(it->second.occlusion_state,
- it->second.occluded_region);
- }
- changes_.clear();
- }
- private:
- struct OcclusionData {
- Window::OcclusionState occlusion_state;
- SkRegion occluded_region;
- };
- // WindowOcclusionChangeBuilder:
- void Add(Window* window,
- Window::OcclusionState occlusion_state,
- SkRegion occluded_region) override {
- // Change back to UNKNOWN is not allowed.
- DCHECK_NE(occlusion_state, Window::OcclusionState::UNKNOWN);
- windows_.Add(window);
- changes_[window] = {occlusion_state, occluded_region};
- }
- // Tracks live windows that has a change. This is needed in addition to the
- // keys in |changes_| because the window tree may change while changes are
- // accumulated or being applied.
- WindowTracker windows_;
- // Stores the accumulated occlusion changes.
- base::flat_map<Window*, OcclusionData> changes_;
- };
- // static
- std::unique_ptr<WindowOcclusionChangeBuilder>
- WindowOcclusionChangeBuilder::Create() {
- return std::make_unique<DefaultWindowOcclusionChangeBuilder>();
- }
- } // namespace aura
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