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      1 /*
      2  * Copyright (C) 2017 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 
     17 #pragma once
     18 
     19 #include "Layer.h"
     20 
     21 #include "Texture.h"
     22 
     23 namespace android {
     24 namespace uirenderer {
     25 
     26 // Forward declarations
     27 class Caches;
     28 
     29 /**
     30  * A layer has dimensions and is backed by an OpenGL texture or FBO.
     31  */
     32 class GlLayer : public Layer {
     33 public:
     34     GlLayer(RenderState& renderState, uint32_t layerWidth, uint32_t layerHeight,
     35             SkColorFilter* colorFilter, int alpha, SkBlendMode mode, bool blend);
     36     virtual ~GlLayer();
     37 
     38     uint32_t getWidth() const override {
     39         return texture.mWidth;
     40     }
     41 
     42     uint32_t getHeight() const override {
     43         return texture.mHeight;
     44     }
     45 
     46     void setSize(uint32_t width, uint32_t height) override {
     47         texture.updateLayout(width, height, texture.internalFormat(), texture.format(),
     48                 texture.target());
     49     }
     50 
     51     void setBlend(bool blend) override {
     52         texture.blend = blend;
     53     }
     54 
     55     bool isBlend() const override {
     56         return texture.blend;
     57     }
     58 
     59     inline GLuint getTextureId() const {
     60         return texture.id();
     61     }
     62 
     63     inline Texture& getTexture() {
     64         return texture;
     65     }
     66 
     67     inline GLenum getRenderTarget() const {
     68         return texture.target();
     69     }
     70 
     71     inline bool isRenderable() const {
     72         return texture.target() != GL_NONE;
     73     }
     74 
     75     void setRenderTarget(GLenum renderTarget);
     76 
     77     void generateTexture();
     78 
     79     /**
     80      * Lost the GL context but the layer is still around, mark it invalid internally
     81      * so the dtor knows not to do any GL work
     82      */
     83     void onGlContextLost();
     84 
     85 private:
     86     Caches& caches;
     87 
     88     /**
     89      * The texture backing this layer.
     90      */
     91     Texture texture;
     92 }; // struct GlLayer
     93 
     94 }; // namespace uirenderer
     95 }; // namespace android
     96