LayerCache.cpp revision e3a9b24b5e3f9b2058486814a6d27729e51ad466 
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 <utils/Log.h>
22
23#include "Caches.h"
24#include "Debug.h"
25#include "LayerCache.h"
26#include "Properties.h"
27
28namespace android {
29namespace uirenderer {
30
31///////////////////////////////////////////////////////////////////////////////
32// Constructors/destructor
33///////////////////////////////////////////////////////////////////////////////
34
35LayerCache::LayerCache(): mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) {
36    char property[PROPERTY_VALUE_MAX];
37    if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) {
38        INIT_LOGD("  Setting layer cache size to %sMB", property);
39        setMaxSize(MB(atof(property)));
40    } else {
41        INIT_LOGD("  Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE);
42    }
43}
44
45LayerCache::~LayerCache() {
46    clear();
47}
48
49///////////////////////////////////////////////////////////////////////////////
50// Size management
51///////////////////////////////////////////////////////////////////////////////
52
53uint32_t LayerCache::getSize() {
54    return mSize;
55}
56
57uint32_t LayerCache::getMaxSize() {
58    return mMaxSize;
59}
60
61void LayerCache::setMaxSize(uint32_t maxSize) {
62    clear();
63    mMaxSize = maxSize;
64}
65
66///////////////////////////////////////////////////////////////////////////////
67// Caching
68///////////////////////////////////////////////////////////////////////////////
69
70int LayerCache::LayerEntry::compare(const LayerCache::LayerEntry& lhs,
71        const LayerCache::LayerEntry& rhs) {
72    int deltaInt = int(lhs.mWidth) - int(rhs.mWidth);
73    if (deltaInt != 0) return deltaInt;
74
75    return int(lhs.mHeight) - int(rhs.mHeight);
76}
77
78void LayerCache::deleteLayer(Layer* layer) {
79    if (layer) {
80        LAYER_LOGD("Destroying layer %dx%d, fbo %d", layer->getWidth(), layer->getHeight(),
81                layer->getFbo());
82        mSize -= layer->getWidth() * layer->getHeight() * 4;
83        Caches::getInstance().resourceCache.decrementRefcount(layer);
84    }
85}
86
87void LayerCache::clear() {
88    size_t count = mCache.size();
89    for (size_t i = 0; i < count; i++) {
90        deleteLayer(mCache.itemAt(i).mLayer);
91    }
92    mCache.clear();
93}
94
95Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
96    Layer* layer = NULL;
97
98    LayerEntry entry(width, height);
99    ssize_t index = mCache.indexOf(entry);
100
101    if (index >= 0) {
102        entry = mCache.itemAt(index);
103        mCache.removeAt(index);
104
105        layer = entry.mLayer;
106        mSize -= layer->getWidth() * layer->getHeight() * 4;
107
108        LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight());
109    } else {
110        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
111
112        layer = new Layer(entry.mWidth, entry.mHeight);
113        layer->setBlend(true);
114        layer->setEmpty(true);
115        layer->setFbo(0);
116
117        layer->generateTexture();
118        layer->bindTexture();
119        layer->setFilter(GL_NEAREST);
120        layer->setWrap(GL_CLAMP_TO_EDGE, false);
121        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
122
123#if DEBUG_LAYERS
124        dump();
125#endif
126    }
127
128    return layer;
129}
130
131void LayerCache::dump() {
132    size_t size = mCache.size();
133    for (size_t i = 0; i < size; i++) {
134        const LayerEntry& entry = mCache.itemAt(i);
135        LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
136    }
137}
138
139bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) {
140    // TODO: We should be smarter and see if we have a texture of the appropriate
141    //       size already in the cache, and reuse it instead of creating a new one
142
143    LayerEntry entry(width, height);
144    if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) {
145        return true;
146    }
147
148    uint32_t oldWidth = layer->getWidth();
149    uint32_t oldHeight = layer->getHeight();
150
151    Caches::getInstance().activeTexture(0);
152    layer->bindTexture();
153    layer->setSize(entry.mWidth, entry.mHeight);
154    layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
155
156    if (glGetError() != GL_NO_ERROR) {
157        layer->setSize(oldWidth, oldHeight);
158        return false;
159    }
160
161    return true;
162}
163
164bool LayerCache::put(Layer* layer) {
165    if (!layer->isCacheable()) return false;
166
167    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
168    // Don't even try to cache a layer that's bigger than the cache
169    if (size < mMaxSize) {
170        // TODO: Use an LRU
171        while (mSize + size > mMaxSize) {
172            size_t position = 0;
173#if LAYER_REMOVE_BIGGEST_FIRST
174            position = mCache.size() - 1;
175#endif
176            Layer* victim = mCache.itemAt(position).mLayer;
177            deleteLayer(victim);
178            mCache.removeAt(position);
179
180            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
181                    victim->layer.getHeight());
182        }
183
184        layer->deferredUpdateScheduled = false;
185        layer->renderer = NULL;
186        layer->displayList = NULL;
187
188        LayerEntry entry(layer);
189
190        mCache.add(entry);
191        mSize += size;
192
193        return true;
194    }
195    return false;
196}
197
198}; // namespace uirenderer
199}; // namespace android
200