LayerCache.cpp revision 5f0c6a483900f3989f4d2a8f913cf5b6a9777d03 
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 "LayerCache.h"
22
23namespace android {
24namespace uirenderer {
25
26///////////////////////////////////////////////////////////////////////////////
27// Constructors/destructor
28///////////////////////////////////////////////////////////////////////////////
29
30LayerCache::LayerCache(uint32_t maxByteSize):
31        mCache(GenerationMultiCache<LayerSize, Layer*>::kUnlimitedCapacity),
32        mSize(0), mMaxSize(maxByteSize) {
33}
34
35LayerCache::~LayerCache() {
36    clear();
37}
38
39///////////////////////////////////////////////////////////////////////////////
40// Size management
41///////////////////////////////////////////////////////////////////////////////
42
43uint32_t LayerCache::getSize() {
44    return mSize;
45}
46
47uint32_t LayerCache::getMaxSize() {
48    return mMaxSize;
49}
50
51void LayerCache::setMaxSize(uint32_t maxSize) {
52    mMaxSize = maxSize;
53    while (mSize > mMaxSize) {
54        Layer* oldest = mCache.removeOldest();
55        deleteLayer(oldest);
56    }
57}
58
59///////////////////////////////////////////////////////////////////////////////
60// Callbacks
61///////////////////////////////////////////////////////////////////////////////
62
63void LayerCache::operator()(LayerSize& size, Layer*& layer) {
64    deleteLayer(layer);
65}
66
67///////////////////////////////////////////////////////////////////////////////
68// Caching
69///////////////////////////////////////////////////////////////////////////////
70
71void LayerCache::deleteLayer(Layer* layer) {
72    if (layer) {
73        mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
74
75        glDeleteFramebuffers(1, &layer->fbo);
76        glDeleteTextures(1, &layer->texture);
77        delete layer;
78    }
79}
80
81void LayerCache::clear() {
82    mCache.setOnEntryRemovedListener(this);
83    mCache.clear();
84    mCache.setOnEntryRemovedListener(NULL);
85}
86
87Layer* LayerCache::get(LayerSize& size) {
88    Layer* layer = mCache.remove(size);
89    if (layer) {
90        mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
91    }
92    return layer;
93}
94
95bool LayerCache::put(LayerSize& layerSize, Layer* layer) {
96    const uint32_t size = layerSize.width * layerSize.height * 4;
97    // Don't even try to cache a layer that's bigger than the cache
98    if (size < mMaxSize) {
99        while (mSize + size > mMaxSize) {
100            Layer* oldest = mCache.removeOldest();
101            deleteLayer(oldest);
102        }
103
104        mCache.put(layerSize, layer);
105        mSize += size;
106
107        return true;
108    }
109    return false;
110}
111
112}; // namespace uirenderer
113}; // namespace android
114