TextureCache.cpp revision 29d8997bd43b7c4ad37fc3d6f91eaafa74913c88 
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    mLock.lock();
106    Texture* texture = mCache.get(bitmap);
107    mLock.unlock();
108
109    if (!texture) {
110        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
111            LOGW("Bitmap too large to be uploaded into a texture");
112            return NULL;
113        }
114
115        const uint32_t size = bitmap->rowBytes() * bitmap->height();
116        // Don't even try to cache a bitmap that's bigger than the cache
117        if (size < mMaxSize) {
118            mLock.lock();
119            while (mSize + size > mMaxSize) {
120                mCache.removeOldest();
121            }
122            mLock.unlock();
123        }
124
125        texture = new Texture;
126        texture->bitmapSize = size;
127        generateTexture(bitmap, texture, false);
128
129        if (size < mMaxSize) {
130            mLock.lock();
131            mSize += size;
132            mCache.put(bitmap, texture);
133            mLock.unlock();
134        } else {
135            texture->cleanup = true;
136        }
137    } else if (bitmap->getGenerationID() != texture->generation) {
138        generateTexture(bitmap, texture, true);
139    }
140
141    return texture;
142}
143
144void TextureCache::remove(SkBitmap* bitmap) {
145    Mutex::Autolock _l(mLock);
146    mCache.remove(bitmap);
147}
148
149void TextureCache::clear() {
150    Mutex::Autolock _l(mLock);
151    mCache.clear();
152}
153
154void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
155    SkAutoLockPixels alp(*bitmap);
156
157    if (!bitmap->readyToDraw()) {
158        LOGE("Cannot generate texture from bitmap");
159        return;
160    }
161
162    const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
163            bitmap->height() != int(texture->height);
164
165    if (!regenerate) {
166        glGenTextures(1, &texture->id);
167    }
168
169    texture->generation = bitmap->getGenerationID();
170    texture->width = bitmap->width();
171    texture->height = bitmap->height();
172
173    glBindTexture(GL_TEXTURE_2D, texture->id);
174    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
175
176    switch (bitmap->getConfig()) {
177    case SkBitmap::kA8_Config:
178        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
179        uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height,
180                GL_UNSIGNED_BYTE, bitmap->getPixels());
181        texture->blend = true;
182        break;
183    case SkBitmap::kRGB_565_Config:
184        uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), texture->height,
185                GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
186        texture->blend = false;
187        break;
188    case SkBitmap::kARGB_8888_Config:
189        uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height,
190                GL_UNSIGNED_BYTE, bitmap->getPixels());
191        // Do this after calling getPixels() to make sure Skia's deferred
192        // decoding happened
193        texture->blend = !bitmap->isOpaque();
194        break;
195    default:
196        LOGW("Unsupported bitmap config");
197        break;
198    }
199
200    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
201    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
202
203    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
204    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
205}
206
207void TextureCache::uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height,
208        GLenum type, const GLvoid * data) {
209    if (resize) {
210        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
211    } else {
212        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
213    }
214}
215
216}; // namespace uirenderer
217}; // namespace android
218