TextureCache.cpp revision 71d08a07189c2b433080203895d9d5e936b16b9e 
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#define ATRACE_TAG ATRACE_TAG_VIEW
19
20#include <GLES2/gl2.h>
21
22#include <SkCanvas.h>
23#include <SkPixelRef.h>
24
25#include <utils/Mutex.h>
26
27#include "Caches.h"
28#include "TextureCache.h"
29#include "Properties.h"
30#include "utils/TraceUtils.h"
31
32namespace android {
33namespace uirenderer {
34
35///////////////////////////////////////////////////////////////////////////////
36// Constructors/destructor
37///////////////////////////////////////////////////////////////////////////////
38
39TextureCache::TextureCache():
40        mCache(LruCache<uint32_t, Texture*>::kUnlimitedCapacity),
41        mSize(0), mMaxSize(MB(DEFAULT_TEXTURE_CACHE_SIZE)),
42        mFlushRate(DEFAULT_TEXTURE_CACHE_FLUSH_RATE) {
43    char property[PROPERTY_VALUE_MAX];
44    if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) {
45        INIT_LOGD("  Setting texture cache size to %sMB", property);
46        setMaxSize(MB(atof(property)));
47    } else {
48        INIT_LOGD("  Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE);
49    }
50
51    if (property_get(PROPERTY_TEXTURE_CACHE_FLUSH_RATE, property, NULL) > 0) {
52        float flushRate = atof(property);
53        INIT_LOGD("  Setting texture cache flush rate to %.2f%%", flushRate * 100.0f);
54        setFlushRate(flushRate);
55    } else {
56        INIT_LOGD("  Using default texture cache flush rate of %.2f%%",
57                DEFAULT_TEXTURE_CACHE_FLUSH_RATE * 100.0f);
58    }
59
60    init();
61}
62
63TextureCache::TextureCache(uint32_t maxByteSize):
64        mCache(LruCache<uint32_t, Texture*>::kUnlimitedCapacity),
65        mSize(0), mMaxSize(maxByteSize) {
66    init();
67}
68
69TextureCache::~TextureCache() {
70    mCache.clear();
71}
72
73void TextureCache::init() {
74    mCache.setOnEntryRemovedListener(this);
75
76    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
77    INIT_LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
78
79    mDebugEnabled = readDebugLevel() & kDebugCaches;
80}
81
82///////////////////////////////////////////////////////////////////////////////
83// Size management
84///////////////////////////////////////////////////////////////////////////////
85
86uint32_t TextureCache::getSize() {
87    return mSize;
88}
89
90uint32_t TextureCache::getMaxSize() {
91    return mMaxSize;
92}
93
94void TextureCache::setMaxSize(uint32_t maxSize) {
95    mMaxSize = maxSize;
96    while (mSize > mMaxSize) {
97        mCache.removeOldest();
98    }
99}
100
101void TextureCache::setFlushRate(float flushRate) {
102    mFlushRate = fmaxf(0.0f, fminf(1.0f, flushRate));
103}
104
105///////////////////////////////////////////////////////////////////////////////
106// Callbacks
107///////////////////////////////////////////////////////////////////////////////
108
109void TextureCache::operator()(uint32_t&, Texture*& texture) {
110    // This will be called already locked
111    if (texture) {
112        mSize -= texture->bitmapSize;
113        TEXTURE_LOGD("TextureCache::callback: name, removed size, mSize = %d, %d, %d",
114                texture->id, texture->bitmapSize, mSize);
115        if (mDebugEnabled) {
116            ALOGD("Texture deleted, size = %d", texture->bitmapSize);
117        }
118        texture->deleteTexture();
119        delete texture;
120    }
121}
122
123///////////////////////////////////////////////////////////////////////////////
124// Caching
125///////////////////////////////////////////////////////////////////////////////
126
127void TextureCache::resetMarkInUse() {
128    LruCache<uint32_t, Texture*>::Iterator iter(mCache);
129    while (iter.next()) {
130        iter.value()->isInUse = false;
131    }
132}
133
134bool TextureCache::canMakeTextureFromBitmap(const SkBitmap* bitmap) {
135    if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
136        ALOGW("Bitmap too large to be uploaded into a texture (%dx%d, max=%dx%d)",
137                bitmap->width(), bitmap->height(), mMaxTextureSize, mMaxTextureSize);
138        return false;
139    }
140    return true;
141}
142
143// Returns a prepared Texture* that either is already in the cache or can fit
144// in the cache (and is thus added to the cache)
145Texture* TextureCache::getCachedTexture(const SkBitmap* bitmap) {
146    Texture* texture = mCache.get(bitmap->pixelRef()->getStableID());
147
148    if (!texture) {
149        if (!canMakeTextureFromBitmap(bitmap)) {
150            return NULL;
151        }
152
153        const uint32_t size = bitmap->rowBytes() * bitmap->height();
154        bool canCache = size < mMaxSize;
155        // Don't even try to cache a bitmap that's bigger than the cache
156        while (canCache && mSize + size > mMaxSize) {
157            Texture* oldest = mCache.peekOldestValue();
158            if (oldest && !oldest->isInUse) {
159                mCache.removeOldest();
160            } else {
161                canCache = false;
162            }
163        }
164
165        if (canCache) {
166            texture = new Texture();
167            texture->bitmapSize = size;
168            generateTexture(bitmap, texture, false);
169
170            mSize += size;
171            TEXTURE_LOGD("TextureCache::get: create texture(%p): name, size, mSize = %d, %d, %d",
172                     bitmap, texture->id, size, mSize);
173            if (mDebugEnabled) {
174                ALOGD("Texture created, size = %d", size);
175            }
176            mCache.put(bitmap->pixelRef()->getStableID(), texture);
177        }
178    } else if (!texture->isInUse && bitmap->getGenerationID() != texture->generation) {
179        // Texture was in the cache but is dirty, re-upload
180        // TODO: Re-adjust the cache size if the bitmap's dimensions have changed
181        generateTexture(bitmap, texture, true);
182    }
183
184    return texture;
185}
186
187bool TextureCache::prefetchAndMarkInUse(const SkBitmap* bitmap) {
188    Texture* texture = getCachedTexture(bitmap);
189    if (texture) {
190        texture->isInUse = true;
191    }
192    return texture;
193}
194
195Texture* TextureCache::get(const SkBitmap* bitmap) {
196    Texture* texture = getCachedTexture(bitmap);
197
198    if (!texture) {
199        if (!canMakeTextureFromBitmap(bitmap)) {
200            return NULL;
201        }
202
203        const uint32_t size = bitmap->rowBytes() * bitmap->height();
204        texture = new Texture();
205        texture->bitmapSize = size;
206        generateTexture(bitmap, texture, false);
207        texture->cleanup = true;
208    }
209
210    return texture;
211}
212
213Texture* TextureCache::getTransient(const SkBitmap* bitmap) {
214    Texture* texture = new Texture();
215    texture->bitmapSize = bitmap->rowBytes() * bitmap->height();
216    texture->cleanup = true;
217
218    generateTexture(bitmap, texture, false);
219
220    return texture;
221}
222
223void TextureCache::releaseTexture(const SkBitmap* bitmap) {
224    if (!bitmap || !bitmap->pixelRef()) return;
225
226    Mutex::Autolock _l(mLock);
227    mGarbage.push(bitmap->pixelRef()->getStableID());
228}
229
230void TextureCache::clearGarbage() {
231    Mutex::Autolock _l(mLock);
232    size_t count = mGarbage.size();
233    for (size_t i = 0; i < count; i++) {
234        uint32_t pixelRefId = mGarbage.itemAt(i);
235        mCache.remove(pixelRefId);
236    }
237    mGarbage.clear();
238}
239
240void TextureCache::clear() {
241    mCache.clear();
242    TEXTURE_LOGD("TextureCache:clear(), mSize = %d", mSize);
243}
244
245void TextureCache::flush() {
246    if (mFlushRate >= 1.0f || mCache.size() == 0) return;
247    if (mFlushRate <= 0.0f) {
248        clear();
249        return;
250    }
251
252    uint32_t targetSize = uint32_t(mSize * mFlushRate);
253    TEXTURE_LOGD("TextureCache::flush: target size: %d", targetSize);
254
255    while (mSize > targetSize) {
256        mCache.removeOldest();
257    }
258}
259
260void TextureCache::generateTexture(const SkBitmap* bitmap, Texture* texture, bool regenerate) {
261    SkAutoLockPixels alp(*bitmap);
262
263    if (!bitmap->readyToDraw()) {
264        ALOGE("Cannot generate texture from bitmap");
265        return;
266    }
267
268    ATRACE_FORMAT("Upload %ux%u Texture", bitmap->width(), bitmap->height());
269
270    // We could also enable mipmapping if both bitmap dimensions are powers
271    // of 2 but we'd have to deal with size changes. Let's keep this simple
272    const bool canMipMap = Extensions::getInstance().hasNPot();
273
274    // If the texture had mipmap enabled but not anymore,
275    // force a glTexImage2D to discard the mipmap levels
276    const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
277            bitmap->height() != int(texture->height) ||
278            (regenerate && canMipMap && texture->mipMap && !bitmap->hasHardwareMipMap());
279
280    if (!regenerate) {
281        glGenTextures(1, &texture->id);
282    }
283
284    texture->generation = bitmap->getGenerationID();
285    texture->width = bitmap->width();
286    texture->height = bitmap->height();
287
288    Caches::getInstance().bindTexture(texture->id);
289
290    switch (bitmap->colorType()) {
291    case kAlpha_8_SkColorType:
292        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
293        uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
294                texture->width, texture->height, GL_UNSIGNED_BYTE, bitmap->getPixels());
295        texture->blend = true;
296        break;
297    case kRGB_565_SkColorType:
298        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
299        uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
300                texture->width, texture->height, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
301        texture->blend = false;
302        break;
303    case kN32_SkColorType:
304        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
305        uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
306                texture->width, texture->height, GL_UNSIGNED_BYTE, bitmap->getPixels());
307        // Do this after calling getPixels() to make sure Skia's deferred
308        // decoding happened
309        texture->blend = !bitmap->isOpaque();
310        break;
311    case kARGB_4444_SkColorType:
312    case kIndex_8_SkColorType:
313        glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
314        uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
315        texture->blend = !bitmap->isOpaque();
316        break;
317    default:
318        ALOGW("Unsupported bitmap colorType: %d", bitmap->colorType());
319        break;
320    }
321
322    if (canMipMap) {
323        texture->mipMap = bitmap->hasHardwareMipMap();
324        if (texture->mipMap) {
325            glGenerateMipmap(GL_TEXTURE_2D);
326        }
327    }
328
329    if (!regenerate) {
330        texture->setFilter(GL_NEAREST);
331        texture->setWrap(GL_CLAMP_TO_EDGE);
332    }
333}
334
335void TextureCache::uploadLoFiTexture(bool resize, const SkBitmap* bitmap,
336        uint32_t width, uint32_t height) {
337    SkBitmap rgbaBitmap;
338    rgbaBitmap.allocPixels(SkImageInfo::MakeN32(width, height, bitmap->alphaType()));
339    rgbaBitmap.eraseColor(0);
340
341    SkCanvas canvas(rgbaBitmap);
342    canvas.drawBitmap(*bitmap, 0.0f, 0.0f, NULL);
343
344    uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), rgbaBitmap.bytesPerPixel(),
345            width, height, GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
346}
347
348void TextureCache::uploadToTexture(bool resize, GLenum format, GLsizei stride, GLsizei bpp,
349        GLsizei width, GLsizei height, GLenum type, const GLvoid * data) {
350    const bool useStride = stride != width && Extensions::getInstance().hasUnpackRowLength();
351    if ((stride == width) || useStride) {
352        if (useStride) {
353            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
354        }
355
356        if (resize) {
357            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
358        } else {
359            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
360        }
361
362        if (useStride) {
363            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
364        }
365    } else {
366        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
367        //  if the stride doesn't match the width
368
369        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
370        if (!temp) return;
371
372        uint8_t * pDst = (uint8_t *)temp;
373        uint8_t * pSrc = (uint8_t *)data;
374        for (GLsizei i = 0; i < height; i++) {
375            memcpy(pDst, pSrc, width * bpp);
376            pDst += width * bpp;
377            pSrc += stride * bpp;
378        }
379
380        if (resize) {
381            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
382        } else {
383            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
384        }
385
386        free(temp);
387    }
388}
389
390}; // namespace uirenderer
391}; // namespace android
392