LayerCache.cpp revision 5c88fc744db977ef26887df9605beaa409394806 
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
70void LayerCache::deleteLayer(Layer* layer) {
71    if (layer) {
72        GLuint fbo = layer->getFbo();
73        LAYER_LOGD("Destroying layer %dx%d, fbo %d", layer->getWidth(), layer->getHeight(), fbo);
74
75        mSize -= layer->getWidth() * layer->getHeight() * 4;
76
77        if (fbo) Caches::getInstance().fboCache.put(fbo);
78        layer->deleteTexture();
79
80        delete layer;
81    }
82}
83
84void LayerCache::clear() {
85    size_t count = mCache.size();
86    for (size_t i = 0; i < count; i++) {
87        deleteLayer(mCache.itemAt(i).mLayer);
88    }
89    mCache.clear();
90}
91
92Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
93    Layer* layer = NULL;
94
95    LayerEntry entry(width, height);
96    ssize_t index = mCache.indexOf(entry);
97
98    if (index >= 0) {
99        entry = mCache.itemAt(index);
100        mCache.removeAt(index);
101
102        layer = entry.mLayer;
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(entry.mWidth, entry.mHeight);
110        layer->setBlend(true);
111        layer->setEmpty(true);
112        layer->setFbo(0);
113
114        layer->generateTexture();
115        layer->bindTexture();
116        layer->setFilter(GL_NEAREST);
117        layer->setWrap(GL_CLAMP_TO_EDGE, false);
118        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
119
120#if DEBUG_LAYERS
121        dump();
122#endif
123    }
124
125    return layer;
126}
127
128void LayerCache::dump() {
129    size_t size = mCache.size();
130    for (size_t i = 0; i < size; i++) {
131        const LayerEntry& entry = mCache.itemAt(i);
132        LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
133    }
134}
135
136bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) {
137    // TODO: We should be smarter and see if we have a texture of the appropriate
138    //       size already in the cache, and reuse it instead of creating a new one
139
140    LayerEntry entry(width, height);
141    if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) {
142        return true;
143    }
144
145    uint32_t oldWidth = layer->getWidth();
146    uint32_t oldHeight = layer->getHeight();
147
148    Caches::getInstance().activeTexture(0);
149    layer->bindTexture();
150    layer->setSize(entry.mWidth, entry.mHeight);
151    layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
152
153    if (glGetError() != GL_NO_ERROR) {
154        layer->setSize(oldWidth, oldHeight);
155        return false;
156    }
157
158    return true;
159}
160
161bool LayerCache::put(Layer* layer) {
162    if (!layer->isCacheable()) return false;
163
164    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
165    // Don't even try to cache a layer that's bigger than the cache
166    if (size < mMaxSize) {
167        // TODO: Use an LRU
168        while (mSize + size > mMaxSize) {
169            size_t position = 0;
170#if LAYER_REMOVE_BIGGEST_FIRST
171            position = mCache.size() - 1;
172#endif
173            Layer* victim = mCache.itemAt(position).mLayer;
174            deleteLayer(victim);
175            mCache.removeAt(position);
176
177            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
178                    victim->layer.getHeight());
179        }
180
181        layer->deferredUpdateScheduled = false;
182        layer->renderer = NULL;
183        layer->displayList = NULL;
184
185        LayerEntry entry(layer);
186
187        mCache.add(entry);
188        mSize += size;
189
190        return true;
191    }
192    return false;
193}
194
195}; // namespace uirenderer
196}; // namespace android
197