Layer.h revision 6c81893c626499e58c8eeb20d6c35ec4e1ce808b 
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_UI_LAYER_H
18#define ANDROID_UI_LAYER_H
19
20#include <GLES2/gl2.h>
21
22#include <SkXfermode.h>
23
24#include "Rect.h"
25
26namespace android {
27namespace uirenderer {
28
29/**
30 * Dimensions of a layer.
31 */
32struct LayerSize {
33    LayerSize(): width(0), height(0), id(0) { }
34    LayerSize(const uint32_t width, const uint32_t height): width(width), height(height), id(0) { }
35    LayerSize(const LayerSize& size): width(size.width), height(size.height), id(size.id) { }
36
37    uint32_t width;
38    uint32_t height;
39
40    // Incremental id used by the layer cache to store multiple
41    // LayerSize with the same dimensions
42    uint32_t id;
43
44    bool operator<(const LayerSize& rhs) const {
45        if (id != 0 && rhs.id != 0) {
46            return id < rhs.id;
47        }
48        if (width == rhs.width) {
49            return height < rhs.height;
50        }
51        return width < rhs.width;
52    }
53
54    bool operator==(const LayerSize& rhs) const {
55        return width == rhs.width && height == rhs.height;
56    }
57};
58
59/**
60 * A layer has dimensions and is backed by an OpenGL texture.
61 */
62struct Layer {
63    /**
64     * Coordinates of the layer corresponding to this snapshot.
65     * Only set when the flag kFlagIsLayer is set.
66     */
67    Rect layer;
68    /**
69     * Name of the texture used to render the layer.
70     * Only set when the flag kFlagIsLayer is set.
71     */
72    GLuint texture;
73    /**
74     * Name of the FBO used to render the layer.
75     * Only set when the flag kFlagIsLayer is set.
76     */
77    GLuint fbo;
78    /**
79     * Opacity of the layer.
80     * Only set when the flag kFlagIsLayer is set.
81     */
82    float alpha;
83    /**
84     * Blending mode of the layer.
85     * Only set when the flag kFlagIsLayer is set.
86     */
87    SkXfermode::Mode mode;
88    /**
89     * Indicates whether this layer should be blended.
90     */
91    bool blend;
92}; // struct Layer
93
94}; // namespace uirenderer
95}; // namespace android
96
97#endif // ANDROID_UI_LAYER_H
98