blob: b2e6204101436503b4f5d6f75eb2df755d05a5d5 [file] [log] [blame]
// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/memory/ptr_util.h"
#include "cc/cc_export.h"
#include "cc/layers/layer_impl.h"
namespace cc {
// This type of layer is used to mirror contents of another layer (specified by
// |mirrored_layer_id_|) by forcing a render pass for the mirrored layer and
// adding a RenderPassDrawQuad in the compositor frame for this layer referring
// to that render pass. The mirroring layer should not be a descendant of the
// mirrored layer (in terms of the effect tree). Due to ordering requirements
// for render passes in the compositor frame, the render pass containing
// mirroring layer should appear after the render pass created for the mirrored
// layer. Currently, render passes are in reverse-draw order of the effect tree,
// so we should be careful that this reverse-draw order does not conflict with
// render pass ordering requirement mentioned above.
// TODO(mohsen): If necessary, reorder render passes in compositor frame such
// that the render pass containing mirroring layer appears after the render pass
// created for the mirrored layer.
class CC_EXPORT MirrorLayerImpl : public LayerImpl {
static std::unique_ptr<MirrorLayerImpl> Create(LayerTreeImpl* tree_impl,
int id) {
return base::WrapUnique(new MirrorLayerImpl(tree_impl, id));
MirrorLayerImpl(const MirrorLayerImpl&) = delete;
MirrorLayerImpl& operator=(const MirrorLayerImpl&) = delete;
~MirrorLayerImpl() override;
void SetMirroredLayerId(int id) { mirrored_layer_id_ = id; }
int mirrored_layer_id() const { return mirrored_layer_id_; }
// LayerImpl overrides.
std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
void AppendQuads(viz::RenderPass* render_pass,
AppendQuadsData* append_quads_data) override;
void PushPropertiesTo(LayerImpl* layer) override;
gfx::Rect GetDamageRect() const override;
gfx::Rect GetEnclosingRectInTargetSpace() const override;
MirrorLayerImpl(LayerTreeImpl* tree_impl, int id);
const char* LayerTypeAsString() const override;
int mirrored_layer_id_ = 0;
} // namespace cc