TextureCache.cpp revision c9855a53edfac818dc68714557185977556f849d 
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        INIT_LOGD("  Setting texture cache size to %sMB", property);
41        setMaxSize(MB(atof(property)));
42    } else {
43        INIT_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    mCache.clear();
57}
58
59void TextureCache::init() {
60    mCache.setOnEntryRemovedListener(this);
61
62    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
63    LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
64
65    mDebugEnabled = readDebugLevel() & kDebugCaches;
66}
67
68///////////////////////////////////////////////////////////////////////////////
69// Size management
70///////////////////////////////////////////////////////////////////////////////
71
72uint32_t TextureCache::getSize() {
73    return mSize;
74}
75
76uint32_t TextureCache::getMaxSize() {
77    return mMaxSize;
78}
79
80void TextureCache::setMaxSize(uint32_t maxSize) {
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        TEXTURE_LOGD("TextureCache::callback: name, removed size, mSize = %d, %d, %d",
96                texture->id, texture->bitmapSize, mSize);
97        if (mDebugEnabled) {
98            LOGD("Texture deleted, size = %d", texture->bitmapSize);
99        }
100        glDeleteTextures(1, &texture->id);
101        delete texture;
102    }
103}
104
105///////////////////////////////////////////////////////////////////////////////
106// Caching
107///////////////////////////////////////////////////////////////////////////////
108
109Texture* TextureCache::get(SkBitmap* bitmap) {
110    Texture* texture = mCache.get(bitmap);
111
112    if (!texture) {
113        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
114            LOGW("Bitmap too large to be uploaded into a texture");
115            return NULL;
116        }
117
118        const uint32_t size = bitmap->rowBytes() * bitmap->height();
119        // Don't even try to cache a bitmap that's bigger than the cache
120        if (size < mMaxSize) {
121            while (mSize + size > mMaxSize) {
122                mCache.removeOldest();
123            }
124        }
125
126        texture = new Texture;
127        texture->bitmapSize = size;
128        generateTexture(bitmap, texture, false);
129
130        if (size < mMaxSize) {
131            mSize += size;
132            TEXTURE_LOGD("TextureCache::get: create texture(%p): name, size, mSize = %d, %d, %d",
133                     bitmap, texture->id, size, mSize);
134            if (mDebugEnabled) {
135                LOGD("Texture created, size = %d", size);
136            }
137            mCache.put(bitmap, texture);
138        } else {
139            texture->cleanup = true;
140        }
141    } else if (bitmap->getGenerationID() != texture->generation) {
142        generateTexture(bitmap, texture, true);
143    }
144
145    return texture;
146}
147
148void TextureCache::remove(SkBitmap* bitmap) {
149    mCache.remove(bitmap);
150}
151
152void TextureCache::removeDeferred(SkBitmap* bitmap) {
153    Mutex::Autolock _l(mLock);
154    mGarbage.push(bitmap);
155}
156
157void TextureCache::clearGarbage() {
158    Mutex::Autolock _l(mLock);
159    size_t count = mGarbage.size();
160    for (size_t i = 0; i < count; i++) {
161        mCache.remove(mGarbage.itemAt(i));
162    }
163    mGarbage.clear();
164}
165
166void TextureCache::clear() {
167    mCache.clear();
168    TEXTURE_LOGD("TextureCache:clear(), miSize = %d", mSize);
169}
170
171void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
172    SkAutoLockPixels alp(*bitmap);
173
174    if (!bitmap->readyToDraw()) {
175        LOGE("Cannot generate texture from bitmap");
176        return;
177    }
178
179    const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
180            bitmap->height() != int(texture->height);
181
182    if (!regenerate) {
183        glGenTextures(1, &texture->id);
184    }
185
186    texture->generation = bitmap->getGenerationID();
187    texture->width = bitmap->width();
188    texture->height = bitmap->height();
189
190    glBindTexture(GL_TEXTURE_2D, texture->id);
191    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
192
193    switch (bitmap->getConfig()) {
194    case SkBitmap::kA8_Config:
195        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
196        uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height,
197                GL_UNSIGNED_BYTE, bitmap->getPixels());
198        texture->blend = true;
199        break;
200    case SkBitmap::kRGB_565_Config:
201        uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), texture->height,
202                GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
203        texture->blend = false;
204        break;
205    case SkBitmap::kARGB_8888_Config:
206        uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height,
207                GL_UNSIGNED_BYTE, bitmap->getPixels());
208        // Do this after calling getPixels() to make sure Skia's deferred
209        // decoding happened
210        texture->blend = !bitmap->isOpaque();
211        break;
212    case SkBitmap::kIndex8_Config:
213        uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
214        texture->blend = false;
215        break;
216    case SkBitmap::kARGB_4444_Config:
217        uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
218        texture->blend = true;
219        break;
220    default:
221        LOGW("Unsupported bitmap config: %d", bitmap->getConfig());
222        break;
223    }
224
225    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
226    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
227
228    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
229    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
230}
231
232void TextureCache::uploadLoFiTexture(bool resize, SkBitmap* bitmap,
233        uint32_t width, uint32_t height) {
234    SkBitmap rgbaBitmap;
235    rgbaBitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
236    rgbaBitmap.allocPixels();
237    rgbaBitmap.eraseColor(0);
238
239    SkCanvas canvas(rgbaBitmap);
240    canvas.drawBitmap(*bitmap, 0.0f, 0.0f, NULL);
241
242    uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), height,
243            GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
244}
245
246void TextureCache::uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height,
247        GLenum type, const GLvoid * data) {
248    if (resize) {
249        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
250    } else {
251        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
252    }
253}
254
255}; // namespace uirenderer
256}; // namespace android
257