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      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 #include <GLES2/gl2.h>
     18 
     19 #include <utils/Mutex.h>
     20 
     21 #include "AssetAtlas.h"
     22 #include "Caches.h"
     23 #include "Texture.h"
     24 #include "TextureCache.h"
     25 #include "Properties.h"
     26 #include "utils/TraceUtils.h"
     27 
     28 namespace android {
     29 namespace uirenderer {
     30 
     31 ///////////////////////////////////////////////////////////////////////////////
     32 // Constructors/destructor
     33 ///////////////////////////////////////////////////////////////////////////////
     34 
     35 TextureCache::TextureCache()
     36         : mCache(LruCache<uint32_t, Texture*>::kUnlimitedCapacity)
     37         , mSize(0)
     38         , mMaxSize(Properties::textureCacheSize)
     39         , mFlushRate(Properties::textureCacheFlushRate)
     40         , mAssetAtlas(nullptr) {
     41     mCache.setOnEntryRemovedListener(this);
     42 
     43     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
     44     INIT_LOGD("    Maximum texture dimension is %d pixels", mMaxTextureSize);
     45 
     46     mDebugEnabled = Properties::debugLevel & kDebugCaches;
     47 }
     48 
     49 TextureCache::~TextureCache() {
     50     mCache.clear();
     51 }
     52 
     53 ///////////////////////////////////////////////////////////////////////////////
     54 // Size management
     55 ///////////////////////////////////////////////////////////////////////////////
     56 
     57 uint32_t TextureCache::getSize() {
     58     return mSize;
     59 }
     60 
     61 uint32_t TextureCache::getMaxSize() {
     62     return mMaxSize;
     63 }
     64 
     65 ///////////////////////////////////////////////////////////////////////////////
     66 // Callbacks
     67 ///////////////////////////////////////////////////////////////////////////////
     68 
     69 void TextureCache::operator()(uint32_t&, Texture*& texture) {
     70     // This will be called already locked
     71     if (texture) {
     72         mSize -= texture->bitmapSize;
     73         TEXTURE_LOGD("TextureCache::callback: name, removed size, mSize = %d, %d, %d",
     74                 texture->id, texture->bitmapSize, mSize);
     75         if (mDebugEnabled) {
     76             ALOGD("Texture deleted, size = %d", texture->bitmapSize);
     77         }
     78         texture->deleteTexture();
     79         delete texture;
     80     }
     81 }
     82 
     83 ///////////////////////////////////////////////////////////////////////////////
     84 // Caching
     85 ///////////////////////////////////////////////////////////////////////////////
     86 
     87 void TextureCache::setAssetAtlas(AssetAtlas* assetAtlas) {
     88     mAssetAtlas = assetAtlas;
     89 }
     90 
     91 void TextureCache::resetMarkInUse(void* ownerToken) {
     92     LruCache<uint32_t, Texture*>::Iterator iter(mCache);
     93     while (iter.next()) {
     94         if (iter.value()->isInUse == ownerToken) {
     95             iter.value()->isInUse = nullptr;
     96         }
     97     }
     98 }
     99 
    100 bool TextureCache::canMakeTextureFromBitmap(const SkBitmap* bitmap) {
    101     if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
    102         ALOGW("Bitmap too large to be uploaded into a texture (%dx%d, max=%dx%d)",
    103                 bitmap->width(), bitmap->height(), mMaxTextureSize, mMaxTextureSize);
    104         return false;
    105     }
    106     return true;
    107 }
    108 
    109 // Returns a prepared Texture* that either is already in the cache or can fit
    110 // in the cache (and is thus added to the cache)
    111 Texture* TextureCache::getCachedTexture(const SkBitmap* bitmap, AtlasUsageType atlasUsageType) {
    112     if (CC_LIKELY(mAssetAtlas != nullptr) && atlasUsageType == AtlasUsageType::Use) {
    113         AssetAtlas::Entry* entry = mAssetAtlas->getEntry(bitmap->pixelRef());
    114         if (CC_UNLIKELY(entry)) {
    115             return entry->texture;
    116         }
    117     }
    118 
    119     Texture* texture = mCache.get(bitmap->pixelRef()->getStableID());
    120 
    121     if (!texture) {
    122         if (!canMakeTextureFromBitmap(bitmap)) {
    123             return nullptr;
    124         }
    125 
    126         const uint32_t size = bitmap->rowBytes() * bitmap->height();
    127         bool canCache = size < mMaxSize;
    128         // Don't even try to cache a bitmap that's bigger than the cache
    129         while (canCache && mSize + size > mMaxSize) {
    130             Texture* oldest = mCache.peekOldestValue();
    131             if (oldest && !oldest->isInUse) {
    132                 mCache.removeOldest();
    133             } else {
    134                 canCache = false;
    135             }
    136         }
    137 
    138         if (canCache) {
    139             texture = new Texture(Caches::getInstance());
    140             texture->bitmapSize = size;
    141             texture->generation = bitmap->getGenerationID();
    142             texture->upload(*bitmap);
    143 
    144             mSize += size;
    145             TEXTURE_LOGD("TextureCache::get: create texture(%p): name, size, mSize = %d, %d, %d",
    146                      bitmap, texture->id, size, mSize);
    147             if (mDebugEnabled) {
    148                 ALOGD("Texture created, size = %d", size);
    149             }
    150             mCache.put(bitmap->pixelRef()->getStableID(), texture);
    151         }
    152     } else if (!texture->isInUse && bitmap->getGenerationID() != texture->generation) {
    153         // Texture was in the cache but is dirty, re-upload
    154         // TODO: Re-adjust the cache size if the bitmap's dimensions have changed
    155         texture->upload(*bitmap);
    156         texture->generation = bitmap->getGenerationID();
    157     }
    158 
    159     return texture;
    160 }
    161 
    162 bool TextureCache::prefetchAndMarkInUse(void* ownerToken, const SkBitmap* bitmap) {
    163     Texture* texture = getCachedTexture(bitmap, AtlasUsageType::Use);
    164     if (texture) {
    165         texture->isInUse = ownerToken;
    166     }
    167     return texture;
    168 }
    169 
    170 bool TextureCache::prefetch(const SkBitmap* bitmap) {
    171     return getCachedTexture(bitmap, AtlasUsageType::Use);
    172 }
    173 
    174 Texture* TextureCache::get(const SkBitmap* bitmap, AtlasUsageType atlasUsageType) {
    175     Texture* texture = getCachedTexture(bitmap, atlasUsageType);
    176 
    177     if (!texture) {
    178         if (!canMakeTextureFromBitmap(bitmap)) {
    179             return nullptr;
    180         }
    181 
    182         const uint32_t size = bitmap->rowBytes() * bitmap->height();
    183         texture = new Texture(Caches::getInstance());
    184         texture->bitmapSize = size;
    185         texture->upload(*bitmap);
    186         texture->generation = bitmap->getGenerationID();
    187         texture->cleanup = true;
    188     }
    189 
    190     return texture;
    191 }
    192 
    193 void TextureCache::releaseTexture(uint32_t pixelRefStableID) {
    194     Mutex::Autolock _l(mLock);
    195     mGarbage.push_back(pixelRefStableID);
    196 }
    197 
    198 void TextureCache::clearGarbage() {
    199     Mutex::Autolock _l(mLock);
    200     size_t count = mGarbage.size();
    201     for (size_t i = 0; i < count; i++) {
    202         uint32_t pixelRefId = mGarbage[i];
    203         mCache.remove(pixelRefId);
    204     }
    205     mGarbage.clear();
    206 }
    207 
    208 void TextureCache::clear() {
    209     mCache.clear();
    210     TEXTURE_LOGD("TextureCache:clear(), mSize = %d", mSize);
    211 }
    212 
    213 void TextureCache::flush() {
    214     if (mFlushRate >= 1.0f || mCache.size() == 0) return;
    215     if (mFlushRate <= 0.0f) {
    216         clear();
    217         return;
    218     }
    219 
    220     uint32_t targetSize = uint32_t(mSize * mFlushRate);
    221     TEXTURE_LOGD("TextureCache::flush: target size: %d", targetSize);
    222 
    223     while (mSize > targetSize) {
    224         mCache.removeOldest();
    225     }
    226 }
    227 
    228 }; // namespace uirenderer
    229 }; // namespace android
    230