LayerCache.cpp revision 38e0c32852e3b9d8ca4a9d3791577f52536419cb 
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 "LayerCache.h"
18
19#include "Caches.h"
20#include "Properties.h"
21
22#include <utils/Log.h>
23
24#include <GLES2/gl2.h>
25
26namespace android {
27namespace uirenderer {
28
29///////////////////////////////////////////////////////////////////////////////
30// Constructors/destructor
31///////////////////////////////////////////////////////////////////////////////
32
33LayerCache::LayerCache()
34        : mSize(0)
35        , mMaxSize(Properties::layerPoolSize) {}
36
37LayerCache::~LayerCache() {
38    clear();
39}
40
41///////////////////////////////////////////////////////////////////////////////
42// Size management
43///////////////////////////////////////////////////////////////////////////////
44
45size_t LayerCache::getCount() {
46    return mCache.size();
47}
48
49uint32_t LayerCache::getSize() {
50    return mSize;
51}
52
53uint32_t LayerCache::getMaxSize() {
54    return mMaxSize;
55}
56
57void LayerCache::setMaxSize(uint32_t maxSize) {
58    clear();
59    mMaxSize = maxSize;
60}
61
62///////////////////////////////////////////////////////////////////////////////
63// Caching
64///////////////////////////////////////////////////////////////////////////////
65
66int LayerCache::LayerEntry::compare(const LayerCache::LayerEntry& lhs,
67        const LayerCache::LayerEntry& rhs) {
68    int deltaInt = int(lhs.mWidth) - int(rhs.mWidth);
69    if (deltaInt != 0) return deltaInt;
70
71    return int(lhs.mHeight) - int(rhs.mHeight);
72}
73
74void LayerCache::deleteLayer(Layer* layer) {
75    if (layer) {
76        LAYER_LOGD("Destroying layer %dx%d, fbo %d", layer->getWidth(), layer->getHeight(),
77                layer->getFbo());
78        mSize -= layer->getWidth() * layer->getHeight() * 4;
79        layer->state = Layer::State::DeletedFromCache;
80        layer->decStrong(nullptr);
81    }
82}
83
84void LayerCache::clear() {
85    for (auto entry : mCache) {
86        deleteLayer(entry.mLayer);
87    }
88    mCache.clear();
89}
90
91Layer* LayerCache::get(RenderState& renderState, const uint32_t width, const uint32_t height) {
92    Layer* layer = nullptr;
93
94    LayerEntry entry(width, height);
95    auto iter = mCache.find(entry);
96
97    if (iter != mCache.end()) {
98        entry = *iter;
99        mCache.erase(iter);
100
101        layer = entry.mLayer;
102        layer->state = Layer::State::RemovedFromCache;
103        mSize -= layer->getWidth() * layer->getHeight() * 4;
104
105        LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight());
106    } else {
107        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
108
109        layer = new Layer(Layer::Type::DisplayList, renderState, entry.mWidth, entry.mHeight);
110        layer->setBlend(true);
111        layer->generateTexture();
112        layer->bindTexture();
113        layer->setFilter(GL_NEAREST);
114        layer->setWrap(GL_CLAMP_TO_EDGE, false);
115
116#if DEBUG_LAYERS
117        dump();
118#endif
119    }
120
121    return layer;
122}
123
124void LayerCache::dump() {
125    for (auto entry : mCache) {
126        ALOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
127    }
128}
129
130bool LayerCache::put(Layer* layer) {
131    if (!layer->isCacheable()) return false;
132
133    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
134    // Don't even try to cache a layer that's bigger than the cache
135    if (size < mMaxSize) {
136        // TODO: Use an LRU
137        while (mSize + size > mMaxSize) {
138            Layer* victim = mCache.begin()->mLayer;
139            deleteLayer(victim);
140            mCache.erase(mCache.begin());
141
142            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
143                    victim->layer.getHeight());
144        }
145
146        layer->cancelDefer();
147
148        LayerEntry entry(layer);
149
150        mCache.insert(entry);
151        mSize += size;
152
153        layer->state = Layer::State::InCache;
154        return true;
155    }
156
157    layer->state = Layer::State::FailedToCache;
158    return false;
159}
160
161}; // namespace uirenderer
162}; // namespace android
163