TextureCache.cpp revision 9aaa8269a3e7291aab84d01c3fc9c744d8f2d2f4 
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#define LOG_TAG "OpenGLRenderer"
18
19#include <GLES2/gl2.h>
20
21#include <utils/threads.h>
22
23#include "TextureCache.h"
24#include "Properties.h"
25
26namespace android {
27namespace uirenderer {
28
29///////////////////////////////////////////////////////////////////////////////
30// Constructors/destructor
31///////////////////////////////////////////////////////////////////////////////
32
33TextureCache::TextureCache():
34        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
35        mSize(0), mMaxSize(MB(DEFAULT_TEXTURE_CACHE_SIZE)) {
36    char property[PROPERTY_VALUE_MAX];
37    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
38        LOGD("  Setting texture cache size to %sMB", property);
39        setMaxSize(MB(atof(property)));
40    } else {
41        LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
42    }
43
44    init();
45}
46
47TextureCache::TextureCache(uint32_t maxByteSize):
48        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
49        mSize(0), mMaxSize(maxByteSize) {
50    init();
51}
52
53TextureCache::~TextureCache() {
54    Mutex::Autolock _l(mLock);
55    mCache.clear();
56}
57
58void TextureCache::init() {
59    mCache.setOnEntryRemovedListener(this);
60
61    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
62    LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
63}
64
65///////////////////////////////////////////////////////////////////////////////
66// Size management
67///////////////////////////////////////////////////////////////////////////////
68
69uint32_t TextureCache::getSize() {
70    Mutex::Autolock _l(mLock);
71    return mSize;
72}
73
74uint32_t TextureCache::getMaxSize() {
75    Mutex::Autolock _l(mLock);
76    return mMaxSize;
77}
78
79void TextureCache::setMaxSize(uint32_t maxSize) {
80    Mutex::Autolock _l(mLock);
81    mMaxSize = maxSize;
82    while (mSize > mMaxSize) {
83        mCache.removeOldest();
84    }
85}
86
87///////////////////////////////////////////////////////////////////////////////
88// Callbacks
89///////////////////////////////////////////////////////////////////////////////
90
91void TextureCache::operator()(SkBitmap*& bitmap, Texture*& texture) {
92    // This will be called already locked
93    if (texture) {
94        mSize -= texture->bitmapSize;
95        glDeleteTextures(1, &texture->id);
96        delete texture;
97    }
98}
99
100///////////////////////////////////////////////////////////////////////////////
101// Caching
102///////////////////////////////////////////////////////////////////////////////
103
104Texture* TextureCache::get(SkBitmap* bitmap) {
105    Mutex::Autolock _l(mLock);
106
107    Texture* texture = mCache.get(bitmap);
108    if (!texture) {
109        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
110            LOGW("Bitmap too large to be uploaded into a texture");
111            return NULL;
112        }
113
114        const uint32_t size = bitmap->rowBytes() * bitmap->height();
115        // Don't even try to cache a bitmap that's bigger than the cache
116        if (size < mMaxSize) {
117            while (mSize + size > mMaxSize) {
118                mCache.removeOldest();
119            }
120        }
121
122        texture = new Texture;
123        texture->bitmapSize = size;
124        generateTexture(bitmap, texture, false);
125
126        if (size < mMaxSize) {
127            mSize += size;
128            mCache.put(bitmap, texture);
129        } else {
130            texture->cleanup = true;
131        }
132    } else if (bitmap->getGenerationID() != texture->generation) {
133        generateTexture(bitmap, texture, true);
134    }
135
136    return texture;
137}
138
139void TextureCache::remove(SkBitmap* bitmap) {
140    Mutex::Autolock _l(mLock);
141    mCache.remove(bitmap);
142}
143
144void TextureCache::clear() {
145    Mutex::Autolock _l(mLock);
146    mCache.clear();
147}
148
149void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
150    SkAutoLockPixels alp(*bitmap);
151
152    if (!bitmap->readyToDraw()) {
153        LOGE("Cannot generate texture from bitmap");
154        return;
155    }
156
157    if (!regenerate) {
158        texture->generation = bitmap->getGenerationID();
159        texture->width = bitmap->width();
160        texture->height = bitmap->height();
161
162        glGenTextures(1, &texture->id);
163    }
164
165    glBindTexture(GL_TEXTURE_2D, texture->id);
166    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
167
168    switch (bitmap->getConfig()) {
169    case SkBitmap::kA8_Config:
170        texture->blend = true;
171        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
172        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height, 0,
173                GL_ALPHA, GL_UNSIGNED_BYTE, bitmap->getPixels());
174        break;
175    case SkBitmap::kRGB_565_Config:
176        texture->blend = false;
177        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmap->rowBytesAsPixels(), texture->height, 0,
178                GL_RGB, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
179        break;
180    case SkBitmap::kARGB_8888_Config:
181        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
182                GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
183        // Do this after calling getPixels() to make sure Skia's deferred
184        // decoding happened
185        texture->blend = !bitmap->isOpaque();
186        break;
187    default:
188        LOGW("Unsupported bitmap config");
189        break;
190    }
191
192    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
193    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
194
195    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
196    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
197}
198
199}; // namespace uirenderer
200}; // namespace android
201