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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.
#ifndef UI_ACCELERATED_WIDGET_MAC_DISPLAY_CA_LAYER_TREE_H_
#define UI_ACCELERATED_WIDGET_MAC_DISPLAY_CA_LAYER_TREE_H_
#include <IOSurface/IOSurfaceRef.h>
#include "base/apple/scoped_cftyperef.h"
#include "ui/accelerated_widget_mac/accelerated_widget_mac_export.h"
#include "ui/accelerated_widget_mac/ca_layer_frame_sink.h"
@class CALayer;
@class CALayerHost;
namespace gfx {
struct CALayerParams;
class Size;
} // namespace gfx
namespace ui {
// Used to create a CALayer tree for displaying compositor output. This is
// created with a CALayer (usually the layer of a layer-hosting NSView) to use
// as the root layer of a small layer tree that displays contents specified via
// CALayerParams from a compositor's output.
class ACCELERATED_WIDGET_MAC_EXPORT DisplayCALayerTree
: public CALayerFrameSink {
public:
explicit DisplayCALayerTree(CALayer* root_layer);
~DisplayCALayerTree() override;
void UpdateCALayerTree(const gfx::CALayerParams& ca_layer_params) override;
private:
void GotCALayerFrame(uint32_t ca_context_id);
void GotIOSurfaceFrame(base::apple::ScopedCFTypeRef<IOSurfaceRef> io_surface,
const gfx::Size& dip_size,
float scale_factor);
// The root layer of the tree specified at creation time.
CALayer* __strong root_layer_;
// A flipped layer, which acts as the parent of either |remote_layer_| or
// |io_surface_layer|. This layer is flipped so that the we don't need to
// recompute the origin for sub-layers when their position changes (this is
// impossible when using remote layers, as their size change cannot be
// synchronized with the window). This indirection is needed because flipping
// hosted layers (like |background_layer_|) leads to unpredictable behavior.
//
// Please note that this is only applicable to macOS as iOS' UIKit has default
// coordinate system where the origin is at the upper left of the drawing
// area. In contrast, AppKit and Core Graphics that macOS uses has its origin
// at the lower left of the drawing area. Thus, we don't need to flip the
// coordinate system on iOS as it's already set the way we want it to be. But
// this layer is still used for robustness.
CALayer* __strong maybe_flipped_layer_;
// A remote CALayer with content provided by the output surface.
CALayerHost* __strong remote_layer_;
// A CALayer that has its content set to an IOSurface.
CALayer* __strong io_surface_layer_;
};
} // namespace ui
#endif // UI_ACCELERATED_WIDGET_MAC_DISPLAY_CA_LAYER_TREE_H_
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