AssetAtlas.cpp revision 7f6d6b0370df4b5a9e0f45bffc31ea6caeeb509d 
1/*
2 * Copyright (C) 2013 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#define LOG_TAG "OpenGLRenderer"
18
19#include "AssetAtlas.h"
20#include "Caches.h"
21
22#include <GLES2/gl2ext.h>
23
24namespace android {
25namespace uirenderer {
26
27///////////////////////////////////////////////////////////////////////////////
28// Lifecycle
29///////////////////////////////////////////////////////////////////////////////
30
31void AssetAtlas::init(sp<GraphicBuffer> buffer, int* map, int count) {
32    if (mImage) {
33        return;
34    }
35
36    mImage = new Image(buffer);
37
38    if (mImage->getTexture()) {
39        Caches& caches = Caches::getInstance();
40
41        mTexture = new Texture(caches);
42        mTexture->id = mImage->getTexture();
43        mTexture->width = buffer->getWidth();
44        mTexture->height = buffer->getHeight();
45
46        createEntries(caches, map, count);
47    } else {
48        ALOGW("Could not create atlas image");
49
50        delete mImage;
51        mImage = NULL;
52        mTexture = NULL;
53    }
54
55    mGenerationId++;
56}
57
58void AssetAtlas::terminate() {
59    if (mImage) {
60        delete mImage;
61        mImage = NULL;
62
63        delete mTexture;
64        mTexture = NULL;
65
66        for (size_t i = 0; i < mEntries.size(); i++) {
67            delete mEntries.valueAt(i);
68        }
69        mEntries.clear();
70    }
71}
72
73///////////////////////////////////////////////////////////////////////////////
74// Entries
75///////////////////////////////////////////////////////////////////////////////
76
77AssetAtlas::Entry* AssetAtlas::getEntry(SkBitmap* const bitmap) const {
78    ssize_t index = mEntries.indexOfKey(bitmap);
79    return index >= 0 ? mEntries.valueAt(index) : NULL;
80}
81
82Texture* AssetAtlas::getEntryTexture(SkBitmap* const bitmap) const {
83    ssize_t index = mEntries.indexOfKey(bitmap);
84    return index >= 0 ? mEntries.valueAt(index)->texture : NULL;
85}
86
87/**
88 * Delegates changes to wrapping and filtering to the base atlas texture
89 * instead of applying the changes to the virtual textures.
90 */
91struct DelegateTexture: public Texture {
92    DelegateTexture(Caches& caches, Texture* delegate): Texture(caches), mDelegate(delegate) { }
93
94    virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
95            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
96        mDelegate->setWrapST(wrapS, wrapT, bindTexture, force, renderTarget);
97    }
98
99    virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
100            bool force = false, GLenum renderTarget = GL_TEXTURE_2D) {
101        mDelegate->setFilterMinMag(min, mag, bindTexture, force, renderTarget);
102    }
103
104private:
105    Texture* const mDelegate;
106}; // struct DelegateTexture
107
108/**
109 * TODO: This method does not take the rotation flag into account
110 */
111void AssetAtlas::createEntries(Caches& caches, int* map, int count) {
112    const float width = float(mTexture->width);
113    const float height = float(mTexture->height);
114
115    for (int i = 0; i < count; ) {
116        SkBitmap* bitmap = (SkBitmap*) map[i++];
117        int x = map[i++];
118        int y = map[i++];
119        bool rotated = map[i++] > 0;
120
121        // Bitmaps should never be null, we're just extra paranoid
122        if (!bitmap) continue;
123
124        const UvMapper mapper(
125                x / width, (x + bitmap->width()) / width,
126                y / height, (y + bitmap->height()) / height);
127
128        Texture* texture = new DelegateTexture(caches, mTexture);
129        texture->id = mTexture->id;
130        texture->blend = !bitmap->isOpaque();
131        texture->width = bitmap->width();
132        texture->height = bitmap->height();
133
134        Entry* entry = new Entry(bitmap, x, y, rotated, texture, mapper, *this);
135        texture->uvMapper = &entry->uvMapper;
136
137        mEntries.add(entry->bitmap, entry);
138    }
139}
140
141}; // namespace uirenderer
142}; // namespace android
143