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      1 /*
      2  * Copyright (C) 2013 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 "Debug.h"
     18 #include "Properties.h"
     19 #include "RenderBufferCache.h"
     20 
     21 #include <utils/Log.h>
     22 
     23 #include <cstdlib>
     24 
     25 namespace android {
     26 namespace uirenderer {
     27 
     28 ///////////////////////////////////////////////////////////////////////////////
     29 // Defines
     30 ///////////////////////////////////////////////////////////////////////////////
     31 
     32 // Debug
     33 #if DEBUG_RENDER_BUFFERS
     34     #define RENDER_BUFFER_LOGD(...) ALOGD(__VA_ARGS__)
     35 #else
     36     #define RENDER_BUFFER_LOGD(...)
     37 #endif
     38 
     39 ///////////////////////////////////////////////////////////////////////////////
     40 // Constructors/destructor
     41 ///////////////////////////////////////////////////////////////////////////////
     42 
     43 RenderBufferCache::RenderBufferCache()
     44         : mSize(0)
     45         , mMaxSize(Properties::renderBufferCacheSize) {}
     46 
     47 RenderBufferCache::~RenderBufferCache() {
     48     clear();
     49 }
     50 
     51 ///////////////////////////////////////////////////////////////////////////////
     52 // Size management
     53 ///////////////////////////////////////////////////////////////////////////////
     54 
     55 uint32_t RenderBufferCache::getSize() {
     56     return mSize;
     57 }
     58 
     59 uint32_t RenderBufferCache::getMaxSize() {
     60     return mMaxSize;
     61 }
     62 
     63 ///////////////////////////////////////////////////////////////////////////////
     64 // Caching
     65 ///////////////////////////////////////////////////////////////////////////////
     66 
     67 int RenderBufferCache::RenderBufferEntry::compare(
     68         const RenderBufferCache::RenderBufferEntry& lhs,
     69         const RenderBufferCache::RenderBufferEntry& rhs) {
     70     int deltaInt = int(lhs.mWidth) - int(rhs.mWidth);
     71     if (deltaInt != 0) return deltaInt;
     72 
     73     deltaInt = int(lhs.mHeight) - int(rhs.mHeight);
     74     if (deltaInt != 0) return deltaInt;
     75 
     76     return int(lhs.mFormat) - int(rhs.mFormat);
     77 }
     78 
     79 void RenderBufferCache::deleteBuffer(RenderBuffer* buffer) {
     80     if (buffer) {
     81         RENDER_BUFFER_LOGD("Deleted %s render buffer (%dx%d)",
     82                 RenderBuffer::formatName(buffer->getFormat()),
     83                 buffer->getWidth(), buffer->getHeight());
     84 
     85         mSize -= buffer->getSize();
     86         delete buffer;
     87     }
     88 }
     89 
     90 void RenderBufferCache::clear() {
     91     for (auto entry : mCache) {
     92         deleteBuffer(entry.mBuffer);
     93     }
     94     mCache.clear();
     95 }
     96 
     97 RenderBuffer* RenderBufferCache::get(GLenum format, const uint32_t width, const uint32_t height) {
     98     RenderBuffer* buffer = nullptr;
     99 
    100     RenderBufferEntry entry(format, width, height);
    101     auto iter = mCache.find(entry);
    102 
    103     if (iter != mCache.end()) {
    104         entry = *iter;
    105         mCache.erase(iter);
    106 
    107         buffer = entry.mBuffer;
    108         mSize -= buffer->getSize();
    109 
    110         RENDER_BUFFER_LOGD("Found %s render buffer (%dx%d)",
    111                 RenderBuffer::formatName(format), width, height);
    112     } else {
    113         buffer = new RenderBuffer(format, width, height);
    114 
    115         RENDER_BUFFER_LOGD("Created new %s render buffer (%dx%d)",
    116                 RenderBuffer::formatName(format), width, height);
    117     }
    118 
    119     buffer->bind();
    120     buffer->allocate();
    121 
    122     return buffer;
    123 }
    124 
    125 bool RenderBufferCache::put(RenderBuffer* buffer) {
    126     if (!buffer) return false;
    127 
    128     const uint32_t size = buffer->getSize();
    129     if (size < mMaxSize) {
    130         while (mSize + size > mMaxSize) {
    131             RenderBuffer* victim = mCache.begin()->mBuffer;
    132             deleteBuffer(victim);
    133             mCache.erase(mCache.begin());
    134         }
    135 
    136         RenderBufferEntry entry(buffer);
    137 
    138         mCache.insert(entry);
    139         mSize += size;
    140 
    141         RENDER_BUFFER_LOGD("Added %s render buffer (%dx%d)",
    142                 RenderBuffer::formatName(buffer->getFormat()),
    143                 buffer->getWidth(), buffer->getHeight());
    144 
    145         return true;
    146     } else {
    147         RENDER_BUFFER_LOGD("Deleted %s render buffer (%dx%d) Size=%d, MaxSize=%d",
    148         RenderBuffer::formatName(buffer->getFormat()),
    149                  buffer->getWidth(), buffer->getHeight(), size, mMaxSize);
    150         delete buffer;
    151     }
    152     return false;
    153 }
    154 
    155 }; // namespace uirenderer
    156 }; // namespace android
    157