LayerCache.cpp revision dda570201ac851dd85af3861f7e575721d3345da 
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(GenerationCache<LayerSize, Layer*>::kUnlimitedCapacity),
32        mSize(0), mMaxSize(maxByteSize) {
33}
34
35LayerCache::~LayerCache() {
36    mCache.setOnEntryRemovedListener(this);
37    mCache.clear();
38}
39
40///////////////////////////////////////////////////////////////////////////////
41// Size management
42///////////////////////////////////////////////////////////////////////////////
43
44uint32_t LayerCache::getSize() {
45    return mSize;
46}
47
48uint32_t LayerCache::getMaxSize() {
49    return mMaxSize;
50}
51
52void LayerCache::setMaxSize(uint32_t maxSize) {
53    mMaxSize = maxSize;
54    while (mSize > mMaxSize) {
55        Layer* oldest = mCache.removeOldest();
56        deleteLayer(oldest);
57    }
58}
59
60///////////////////////////////////////////////////////////////////////////////
61// Callbacks
62///////////////////////////////////////////////////////////////////////////////
63
64void LayerCache::operator()(LayerSize& size, Layer*& layer) {
65    deleteLayer(layer);
66}
67
68///////////////////////////////////////////////////////////////////////////////
69// Caching
70///////////////////////////////////////////////////////////////////////////////
71
72void LayerCache::deleteLayer(Layer* layer) {
73    if (layer) {
74        mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
75
76        glDeleteFramebuffers(1, &layer->fbo);
77        glDeleteTextures(1, &layer->texture);
78        delete layer;
79    }
80}
81
82void LayerCache::clear() {
83    mCache.setOnEntryRemovedListener(this);
84    mCache.clear();
85    mCache.setOnEntryRemovedListener(NULL);
86}
87
88Layer* LayerCache::get(LayerSize& size) {
89    Layer* layer = mCache.remove(size);
90    if (layer) {
91        mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
92    }
93    return layer;
94}
95
96bool LayerCache::put(LayerSize& layerSize, Layer* layer) {
97    const uint32_t size = layerSize.width * layerSize.height * 4;
98    // Don't even try to cache a layer that's bigger than the cache
99    if (size < mMaxSize) {
100        while (mSize + size > mMaxSize) {
101            Layer* oldest = mCache.removeOldest();
102            deleteLayer(oldest);
103        }
104
105        mCache.put(layerSize, layer);
106        mSize += size;
107
108        return true;
109    }
110    return false;
111}
112
113}; // namespace uirenderer
114}; // namespace android
115