| // Copyright 2019 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_LAYERS_MIRROR_LAYER_IMPL_H_ |
| #define CC_LAYERS_MIRROR_LAYER_IMPL_H_ |
| |
| #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 CompositorRenderPassDrawQuad 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 { |
| public: |
| 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) const override; |
| void AppendQuads(viz::CompositorRenderPass* render_pass, |
| AppendQuadsData* append_quads_data) override; |
| void PushPropertiesTo(LayerImpl* layer) override; |
| gfx::Rect GetDamageRect() const override; |
| gfx::Rect GetEnclosingVisibleRectInTargetSpace() const override; |
| |
| protected: |
| MirrorLayerImpl(LayerTreeImpl* tree_impl, int id); |
| |
| private: |
| const char* LayerTypeAsString() const override; |
| viz::CompositorRenderPassId mirrored_layer_render_pass_id() const { |
| return viz::CompositorRenderPassId{mirrored_layer_id()}; |
| } |
| |
| int mirrored_layer_id_ = 0; |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_LAYERS_MIRROR_LAYER_IMPL_H_ |