GlLayer.h revision 00eb43dbc04083eab85fbb1a9589e2548f2004ed 
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
23namespace android {
24namespace uirenderer {
25
26// Forward declarations
27class Caches;
28
29/**
30 * A layer has dimensions and is backed by an OpenGL texture or FBO.
31 */
32class GlLayer : public Layer {
33public:
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.updateSize(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 void setRenderTarget(GLenum renderTarget) {
72        texture.mTarget = renderTarget;
73    }
74
75    inline bool isRenderable() const {
76        return texture.target() != GL_NONE;
77    }
78
79    void setWrap(GLenum wrap, bool bindTexture = false, bool force = false) {
80        texture.setWrap(wrap, bindTexture, force);
81    }
82
83    void setFilter(GLenum filter, bool bindTexture = false, bool force = false) {
84        texture.setFilter(filter, bindTexture, force);
85    }
86
87    void bindTexture() const;
88    void generateTexture();
89
90    /**
91     * Lost the GL context but the layer is still around, mark it invalid internally
92     * so the dtor knows not to do any GL work
93     */
94    void onGlContextLost();
95
96private:
97    Caches& caches;
98
99    /**
100     * The texture backing this layer.
101     */
102    Texture texture;
103}; // struct GlLayer
104
105}; // namespace uirenderer
106}; // namespace android
107