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// Copyright 2018 The Chromium Authors
// 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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