TextureCache.cpp revision 7adaf3d1aa18c7e521f7154e545fe52d329763c3 
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 <SkCanvas.h>
22
23#include <utils/threads.h>
24
25#include "TextureCache.h"
26#include "Properties.h"
27
28namespace android {
29namespace uirenderer {
30
31///////////////////////////////////////////////////////////////////////////////
32// Constructors/destructor
33///////////////////////////////////////////////////////////////////////////////
34
35TextureCache::TextureCache():
36        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
37        mSize(0), mMaxSize(MB(DEFAULT_TEXTURE_CACHE_SIZE)) {
38    char property[PROPERTY_VALUE_MAX];
39    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
40        LOGD("  Setting texture cache size to %sMB", property);
41        setMaxSize(MB(atof(property)));
42    } else {
43        LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
44    }
45
46    init();
47}
48
49TextureCache::TextureCache(uint32_t maxByteSize):
50        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
51        mSize(0), mMaxSize(maxByteSize) {
52    init();
53}
54
55TextureCache::~TextureCache() {
56    Mutex::Autolock _l(mLock);
57    mCache.clear();
58}
59
60void TextureCache::init() {
61    mCache.setOnEntryRemovedListener(this);
62
63    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
64    LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
65}
66
67///////////////////////////////////////////////////////////////////////////////
68// Size management
69///////////////////////////////////////////////////////////////////////////////
70
71uint32_t TextureCache::getSize() {
72    Mutex::Autolock _l(mLock);
73    return mSize;
74}
75
76uint32_t TextureCache::getMaxSize() {
77    Mutex::Autolock _l(mLock);
78    return mMaxSize;
79}
80
81void TextureCache::setMaxSize(uint32_t maxSize) {
82    Mutex::Autolock _l(mLock);
83    mMaxSize = maxSize;
84    while (mSize > mMaxSize) {
85        mCache.removeOldest();
86    }
87}
88
89///////////////////////////////////////////////////////////////////////////////
90// Callbacks
91///////////////////////////////////////////////////////////////////////////////
92
93void TextureCache::operator()(SkBitmap*& bitmap, Texture*& texture) {
94    // This will be called already locked
95    if (texture) {
96        mSize -= texture->bitmapSize;
97        glDeleteTextures(1, &texture->id);
98        delete texture;
99    }
100}
101
102///////////////////////////////////////////////////////////////////////////////
103// Caching
104///////////////////////////////////////////////////////////////////////////////
105
106Texture* TextureCache::get(SkBitmap* bitmap) {
107    mLock.lock();
108    Texture* texture = mCache.get(bitmap);
109    mLock.unlock();
110
111    if (!texture) {
112        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
113            LOGW("Bitmap too large to be uploaded into a texture");
114            return NULL;
115        }
116
117        const uint32_t size = bitmap->rowBytes() * bitmap->height();
118        // Don't even try to cache a bitmap that's bigger than the cache
119        if (size < mMaxSize) {
120            mLock.lock();
121            while (mSize + size > mMaxSize) {
122                mCache.removeOldest();
123            }
124            mLock.unlock();
125        }
126
127        texture = new Texture;
128        texture->bitmapSize = size;
129        generateTexture(bitmap, texture, false);
130
131        if (size < mMaxSize) {
132            mLock.lock();
133            mSize += size;
134            mCache.put(bitmap, texture);
135            mLock.unlock();
136        } else {
137            texture->cleanup = true;
138        }
139    } else if (bitmap->getGenerationID() != texture->generation) {
140        generateTexture(bitmap, texture, true);
141    }
142
143    return texture;
144}
145
146void TextureCache::remove(SkBitmap* bitmap) {
147    Mutex::Autolock _l(mLock);
148    mCache.remove(bitmap);
149}
150
151void TextureCache::clear() {
152    Mutex::Autolock _l(mLock);
153    mCache.clear();
154}
155
156void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
157    SkAutoLockPixels alp(*bitmap);
158
159    if (!bitmap->readyToDraw()) {
160        LOGE("Cannot generate texture from bitmap");
161        return;
162    }
163
164    const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
165            bitmap->height() != int(texture->height);
166
167    if (!regenerate) {
168        glGenTextures(1, &texture->id);
169    }
170
171    texture->generation = bitmap->getGenerationID();
172    texture->width = bitmap->width();
173    texture->height = bitmap->height();
174
175    glBindTexture(GL_TEXTURE_2D, texture->id);
176    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
177
178    switch (bitmap->getConfig()) {
179    case SkBitmap::kA8_Config:
180        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
181        uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height,
182                GL_UNSIGNED_BYTE, bitmap->getPixels());
183        texture->blend = true;
184        break;
185    case SkBitmap::kRGB_565_Config:
186        uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), texture->height,
187                GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
188        texture->blend = false;
189        break;
190    case SkBitmap::kARGB_8888_Config:
191        uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height,
192                GL_UNSIGNED_BYTE, bitmap->getPixels());
193        // Do this after calling getPixels() to make sure Skia's deferred
194        // decoding happened
195        texture->blend = !bitmap->isOpaque();
196        break;
197    case SkBitmap::kIndex8_Config:
198        uploadPalettedTexture(resize, bitmap, texture->width, texture->height);
199        texture->blend = false;
200        break;
201    default:
202        LOGW("Unsupported bitmap config: %d", bitmap->getConfig());
203        break;
204    }
205
206    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
207    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
208
209    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
210    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
211}
212
213void TextureCache::uploadPalettedTexture(bool resize, SkBitmap* bitmap,
214        uint32_t width, uint32_t height) {
215    SkBitmap rgbaBitmap;
216    rgbaBitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
217    rgbaBitmap.allocPixels();
218    rgbaBitmap.eraseColor(0);
219
220    SkCanvas canvas(rgbaBitmap);
221    canvas.drawBitmap(*bitmap, 0.0f, 0.0f, NULL);
222
223    uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), height,
224            GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
225}
226
227void TextureCache::uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height,
228        GLenum type, const GLvoid * data) {
229    if (resize) {
230        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
231    } else {
232        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
233    }
234}
235
236}; // namespace uirenderer
237}; // namespace android
238