TextureCache.cpp revision d43b22da291fd08017fac627561091a633c85807 
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        mFlushRate(DEFAULT_TEXTURE_CACHE_FLUSH_RATE) {
39    char property[PROPERTY_VALUE_MAX];
40    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
41        INIT_LOGD("  Setting texture cache size to %sMB", property);
42        setMaxSize(MB(atof(property)));
43    } else {
44        INIT_LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
45    }
46
47    if (property_get(PROPERTY_TEXTURE_CACHE_FLUSH_RATE, property, NULL) > 0) {
48        float flushRate = atof(property);
49        INIT_LOGD("  Setting texture cache flush rate to %.2f%%", flushRate * 100.0f);
50        setFlushRate(flushRate);
51    } else {
52        INIT_LOGD("  Using default texture cache flush rate of %.2f%%",
53                DEFAULT_TEXTURE_CACHE_FLUSH_RATE * 100.0f);
54    }
55
56    init();
57}
58
59TextureCache::TextureCache(uint32_t maxByteSize):
60        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
61        mSize(0), mMaxSize(maxByteSize) {
62    init();
63}
64
65TextureCache::~TextureCache() {
66    mCache.clear();
67}
68
69void TextureCache::init() {
70    mCache.setOnEntryRemovedListener(this);
71
72    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
73    INIT_LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
74
75    mDebugEnabled = readDebugLevel() & kDebugCaches;
76}
77
78///////////////////////////////////////////////////////////////////////////////
79// Size management
80///////////////////////////////////////////////////////////////////////////////
81
82uint32_t TextureCache::getSize() {
83    return mSize;
84}
85
86uint32_t TextureCache::getMaxSize() {
87    return mMaxSize;
88}
89
90void TextureCache::setMaxSize(uint32_t maxSize) {
91    mMaxSize = maxSize;
92    while (mSize > mMaxSize) {
93        mCache.removeOldest();
94    }
95}
96
97void TextureCache::setFlushRate(float flushRate) {
98    mFlushRate = fmaxf(0.0f, fminf(1.0f, flushRate));
99}
100
101///////////////////////////////////////////////////////////////////////////////
102// Callbacks
103///////////////////////////////////////////////////////////////////////////////
104
105void TextureCache::operator()(SkBitmap*& bitmap, Texture*& texture) {
106    // This will be called already locked
107    if (texture) {
108        mSize -= texture->bitmapSize;
109        TEXTURE_LOGD("TextureCache::callback: name, removed size, mSize = %d, %d, %d",
110                texture->id, texture->bitmapSize, mSize);
111        if (mDebugEnabled) {
112            ALOGD("Texture deleted, size = %d", texture->bitmapSize);
113        }
114        glDeleteTextures(1, &texture->id);
115        delete texture;
116    }
117}
118
119///////////////////////////////////////////////////////////////////////////////
120// Caching
121///////////////////////////////////////////////////////////////////////////////
122
123Texture* TextureCache::get(SkBitmap* bitmap) {
124    Texture* texture = mCache.get(bitmap);
125
126    if (!texture) {
127        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
128            ALOGW("Bitmap too large to be uploaded into a texture (%dx%d, max=%dx%d)",
129                    bitmap->width(), bitmap->height(), mMaxTextureSize, mMaxTextureSize);
130            return NULL;
131        }
132
133        const uint32_t size = bitmap->rowBytes() * bitmap->height();
134        // Don't even try to cache a bitmap that's bigger than the cache
135        if (size < mMaxSize) {
136            while (mSize + size > mMaxSize) {
137                mCache.removeOldest();
138            }
139        }
140
141        texture = new Texture;
142        texture->bitmapSize = size;
143        generateTexture(bitmap, texture, false);
144
145        if (size < mMaxSize) {
146            mSize += size;
147            TEXTURE_LOGD("TextureCache::get: create texture(%p): name, size, mSize = %d, %d, %d",
148                     bitmap, texture->id, size, mSize);
149            if (mDebugEnabled) {
150                ALOGD("Texture created, size = %d", size);
151            }
152            mCache.put(bitmap, texture);
153        } else {
154            texture->cleanup = true;
155        }
156    } else if (bitmap->getGenerationID() != texture->generation) {
157        generateTexture(bitmap, texture, true);
158    }
159
160    return texture;
161}
162
163Texture* TextureCache::getTransient(SkBitmap* bitmap) {
164    Texture* texture = new Texture;
165    texture->bitmapSize = bitmap->rowBytes() * bitmap->height();
166    texture->cleanup = true;
167
168    generateTexture(bitmap, texture, false);
169
170    return texture;
171}
172
173void TextureCache::remove(SkBitmap* bitmap) {
174    mCache.remove(bitmap);
175}
176
177void TextureCache::removeDeferred(SkBitmap* bitmap) {
178    Mutex::Autolock _l(mLock);
179    mGarbage.push(bitmap);
180}
181
182void TextureCache::clearGarbage() {
183    Mutex::Autolock _l(mLock);
184    size_t count = mGarbage.size();
185    for (size_t i = 0; i < count; i++) {
186        mCache.remove(mGarbage.itemAt(i));
187    }
188    mGarbage.clear();
189}
190
191void TextureCache::clear() {
192    mCache.clear();
193    TEXTURE_LOGD("TextureCache:clear(), mSize = %d", mSize);
194}
195
196void TextureCache::flush() {
197    if (mFlushRate >= 1.0f || mCache.size() == 0) return;
198    if (mFlushRate <= 0.0f) {
199        clear();
200        return;
201    }
202
203    uint32_t targetSize = uint32_t(mSize * mFlushRate);
204    TEXTURE_LOGD("TextureCache::flush: target size: %d", targetSize);
205
206    while (mSize > targetSize) {
207        mCache.removeOldest();
208    }
209}
210
211void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
212    SkAutoLockPixels alp(*bitmap);
213
214    if (!bitmap->readyToDraw()) {
215        ALOGE("Cannot generate texture from bitmap");
216        return;
217    }
218
219    const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
220            bitmap->height() != int(texture->height);
221
222    if (!regenerate) {
223        glGenTextures(1, &texture->id);
224    }
225
226    texture->generation = bitmap->getGenerationID();
227    texture->width = bitmap->width();
228    texture->height = bitmap->height();
229
230    glBindTexture(GL_TEXTURE_2D, texture->id);
231
232    switch (bitmap->getConfig()) {
233    case SkBitmap::kA8_Config:
234        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
235        uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height,
236                GL_UNSIGNED_BYTE, bitmap->getPixels());
237        texture->blend = true;
238        break;
239    case SkBitmap::kRGB_565_Config:
240        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
241        uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), texture->height,
242                GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
243        texture->blend = false;
244        break;
245    case SkBitmap::kARGB_8888_Config:
246        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
247        uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height,
248                GL_UNSIGNED_BYTE, bitmap->getPixels());
249        // Do this after calling getPixels() to make sure Skia's deferred
250        // decoding happened
251        texture->blend = !bitmap->isOpaque();
252        break;
253    case SkBitmap::kARGB_4444_Config:
254    case SkBitmap::kIndex8_Config:
255        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
256        uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
257        texture->blend = !bitmap->isOpaque();
258        break;
259    default:
260        ALOGW("Unsupported bitmap config: %d", bitmap->getConfig());
261        break;
262    }
263
264    if (!regenerate) {
265        texture->setFilter(GL_NEAREST);
266        texture->setWrap(GL_CLAMP_TO_EDGE);
267    }
268}
269
270void TextureCache::uploadLoFiTexture(bool resize, SkBitmap* bitmap,
271        uint32_t width, uint32_t height) {
272    SkBitmap rgbaBitmap;
273    rgbaBitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
274    rgbaBitmap.allocPixels();
275    rgbaBitmap.eraseColor(0);
276    rgbaBitmap.setIsOpaque(bitmap->isOpaque());
277
278    SkCanvas canvas(rgbaBitmap);
279    canvas.drawBitmap(*bitmap, 0.0f, 0.0f, NULL);
280
281    uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), height,
282            GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
283}
284
285void TextureCache::uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height,
286        GLenum type, const GLvoid * data) {
287    if (resize) {
288        glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
289    } else {
290        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
291    }
292}
293
294}; // namespace uirenderer
295}; // namespace android
296