chromium/cc/trees/occlusion_tracker.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_TREES_OCCLUSION_TRACKER_H_
#define CC_TREES_OCCLUSION_TRACKER_H_

#include <vector>

#include "base/memory/raw_ptr_exclusion.h"
#include "cc/base/simple_enclosed_region.h"
#include "cc/cc_export.h"
#include "cc/layers/effect_tree_layer_list_iterator.h"
#include "cc/trees/occlusion.h"
#include "ui/gfx/geometry/rect.h"

namespace cc {
class LayerImpl;
class Region;
class RenderSurfaceImpl;

// This class is used to track occlusion of layers while traversing them in a
// front-to-back order. As each layer is visited, one of the methods in this
// class is called to notify it about the current target surface. Then,
// occlusion in the content space of the current layer may be queried, via
// Occlusion from GetCurrentOcclusionForLayer(). If the current layer owns a
// RenderSurfaceImpl, then occlusion on that RenderSurfaceImpl may also be
// queried via surfaceOccluded() and surfaceUnoccludedContentRect(). Finally,
// once finished with the layer, occlusion behind the layer should be marked by
// calling MarkOccludedBehindLayer().
class CC_EXPORT OcclusionTracker { … };

}  // namespace cc

#endif  // CC_TREES_OCCLUSION_TRACKER_H_