Layer.h revision 5b3b35296e8b2c8d3f07d32bb645d5414db41a1d 
1/*
2 * Copyright (C) 2010 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#ifndef ANDROID_HWUI_LAYER_H
18#define ANDROID_HWUI_LAYER_H
19
20#include <sys/types.h>
21
22#include <GLES2/gl2.h>
23
24#include <ui/Region.h>
25
26#include <SkXfermode.h>
27
28#include "Rect.h"
29
30namespace android {
31namespace uirenderer {
32
33///////////////////////////////////////////////////////////////////////////////
34// Layers
35///////////////////////////////////////////////////////////////////////////////
36
37/**
38 * A layer has dimensions and is backed by an OpenGL texture or FBO.
39 */
40struct Layer {
41    Layer(const uint32_t layerWidth, const uint32_t layerHeight):
42            width(layerWidth), height(layerHeight) {
43    }
44
45    /**
46     * Bounds of the layer.
47     */
48    Rect layer;
49    /**
50     * Texture coordinates of the layer.
51     */
52    Rect texCoords;
53
54    /**
55     * Name of the FBO used to render the layer. If the name is 0
56     * this layer is not backed by an FBO, but a simple texture.
57     */
58    GLuint fbo;
59
60    /**
61     * Opacity of the layer.
62     */
63    int alpha;
64    /**
65     * Blending mode of the layer.
66     */
67    SkXfermode::Mode mode;
68    /**
69     * Indicates whether this layer should be blended.
70     */
71    bool blend;
72
73    /**
74     * Indicates whether this layer has been used already.
75     */
76    bool empty;
77
78    /**
79     * Name of the texture used to render the layer.
80     */
81    GLuint texture;
82    /**
83     * Width of the layer texture.
84     */
85    uint32_t width;
86    /**
87     * Height of the layer texture.
88     */
89    uint32_t height;
90
91    /**
92     * Dirty region indicating what parts of the layer
93     * have been drawn.
94     */
95    Region region;
96}; // struct Layer
97
98}; // namespace uirenderer
99}; // namespace android
100
101#endif // ANDROID_HWUI_LAYER_H
102