chromium/ui/compositor/layer.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 UI_COMPOSITOR_LAYER_H_
#define UI_COMPOSITOR_LAYER_H_

#include <stddef.h>

#include <array>
#include <memory>
#include <string>
#include <vector>

#include "base/auto_reset.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "cc/base/region.h"
#include "cc/layers/content_layer_client.h"
#include "cc/layers/surface_layer.h"
#include "cc/layers/texture_layer_client.h"
#include "cc/paint/filter_operation.h"
#include "components/viz/common/resources/transferable_resource.h"
#include "components/viz/common/surfaces/subtree_capture_id.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/compositor/layer_animation_delegate.h"
#include "ui/compositor/layer_type.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/image/image_skia.h"

namespace cc {
class Layer;
class MirrorLayer;
class NinePatchLayer;
class SolidColorLayer;
class SurfaceLayer;
class TextureLayer;
}

namespace gfx {
class RoundedCornersF;
class Transform;
class LinearGradient;
}  // namespace gfx

namespace viz {
class CopyOutputRequest;
struct TransferableResource;
}

namespace ui {

class Compositor;
class LayerAnimator;
class LayerDelegate;
class LayerObserver;
class LayerOwner;
class LayerThreadedAnimationDelegate;

// Layer manages a texture, transform and a set of child Layers. Any View that
// has enabled layers ends up creating a Layer to manage the texture.
// A Layer can also be created without a texture, in which case it renders
// nothing and is simply used as a node in a hierarchy of layers.
// Coordinate system used in layers is DIP (Density Independent Pixel)
// coordinates unless explicitly mentioned as pixel coordinates.
//
// NOTE: Unlike Views, each Layer does *not* own its child Layers. If you
// delete a Layer and it has children, the parent of each child Layer is set to
// NULL, but the children are not deleted.
class COMPOSITOR_EXPORT Layer : public LayerAnimationDelegate,
                                public cc::ContentLayerClient,
                                public cc::TextureLayerClient { … };

}  // namespace ui

#endif  // UI_COMPOSITOR_LAYER_H_