1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 #pragma once
17 
18 #include <sys/types.h>
19 
20 #include <cstdint>
21 
22 #include "Layer.h"
23 
24 namespace android {
25 
26 // A layer that can render a combination of the following effects.
27 //   * fill the bounds of the layer with a color
28 //   * render a shadow cast by the bounds of the layer
29 // If no effects are enabled, the layer is considered to be invisible.
30 class EffectLayer : public Layer {
31 public:
32     explicit EffectLayer(const LayerCreationArgs&);
33     ~EffectLayer() override;
34 
35     sp<compositionengine::LayerFE> getCompositionEngineLayerFE() const override;
36     compositionengine::LayerFECompositionState* editCompositionState() override;
37 
getType()38     const char* getType() const override { return "EffectLayer"; }
39     bool isVisible() const override;
40 
41     bool setColor(const half3& color) override;
42 
43     bool setDataspace(ui::Dataspace dataspace) override;
44 
45     ui::Dataspace getDataSpace() const override;
46 
47     bool isOpaque(const Layer::State& s) const override;
48 
49 protected:
50     /*
51      * compositionengine::LayerFE overrides
52      */
53     const compositionengine::LayerFECompositionState* getCompositionState() const override;
54     void preparePerFrameCompositionState() override;
55     std::vector<compositionengine::LayerFE::LayerSettings> prepareClientCompositionList(
56             compositionengine::LayerFE::ClientCompositionTargetSettings& targetSettings) override;
57 
58     std::unique_ptr<compositionengine::LayerFECompositionState> mCompositionState;
59 
60     sp<Layer> createClone() override;
61 
62 private:
63     // Returns true if there is a valid color to fill.
64     bool fillsColor() const;
65     // Returns true if this layer has a blur value.
66     bool hasBlur() const;
hasSomethingToDraw()67     bool hasSomethingToDraw() const { return fillsColor() || drawShadows() || hasBlur(); }
68 };
69 
70 } // namespace android
71