chromium/cc/slim/layer.h

// Copyright 2023 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_SLIM_LAYER_H_
#define CC_SLIM_LAYER_H_

#include <optional>
#include <vector>

#include "base/component_export.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "cc/paint/filter_operations.h"
#include "cc/slim/filter.h"
#include "cc/slim/frame_data.h"
#include "components/viz/common/quads/offset_tag.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/geometry/linear_gradient.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rounded_corners_f.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/transform.h"

namespace viz {
class CompositorRenderPass;
class SharedQuadState;
}  // namespace viz

namespace cc::slim {

class LayerTree;
class LayerTreeCcWrapper;
class LayerTreeImpl;

// Base class for composited layers. Special layer types are derived from
// this class. Each layer is an independent unit in the compositor, be that
// for transforming or for content. If a layer has content it can be
// transformed efficiently without requiring the content to be recreated.
// Layers form a tree, with each layer having 0 or more children, and a single
// parent (or none at the root). Layers within the tree, other than the root
// layer, are kept alive by that tree relationship, with refpointer ownership
// from parents to children.
class COMPONENT_EXPORT(CC_SLIM) Layer : public base::RefCounted<Layer> { … };

}  // namespace cc::slim

#endif  // CC_SLIM_LAYER_H_