LayerCache.cpp revision a1d3c91afbd52c7e8b01f4a9060c5459f02ae7a5 
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        LAYER_LOGD("Destroying layer %dx%d", layer->getWidth(), layer->getHeight());
73        mSize -= layer->getWidth() * layer->getHeight() * 4;
74        layer->deleteFbo();
75        layer->deleteTexture();
76        delete layer;
77    }
78}
79
80void LayerCache::clear() {
81    size_t count = mCache.size();
82    for (size_t i = 0; i < count; i++) {
83        deleteLayer(mCache.itemAt(i).mLayer);
84    }
85    mCache.clear();
86}
87
88Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
89    Layer* layer = NULL;
90
91    LayerEntry entry(width, height);
92    ssize_t index = mCache.indexOf(entry);
93
94    if (index >= 0) {
95        entry = mCache.itemAt(index);
96        mCache.removeAt(index);
97
98        layer = entry.mLayer;
99        mSize -= layer->getWidth() * layer->getHeight() * 4;
100
101        LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight());
102    } else {
103        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
104
105        layer = new Layer(entry.mWidth, entry.mHeight);
106        layer->setBlend(true);
107        layer->setEmpty(true);
108        layer->setFbo(0);
109
110        layer->generateTexture();
111        layer->bindTexture();
112        layer->setFilter(GL_NEAREST);
113        layer->setWrap(GL_CLAMP_TO_EDGE, false);
114        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
115
116#if DEBUG_LAYERS
117        dump();
118#endif
119    }
120
121    return layer;
122}
123
124void LayerCache::dump() {
125    size_t size = mCache.size();
126    for (size_t i = 0; i < size; i++) {
127        const LayerEntry& entry = mCache.itemAt(i);
128        LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
129    }
130}
131
132bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) {
133    // TODO: We should be smarter and see if we have a texture of the appropriate
134    //       size already in the cache, and reuse it instead of creating a new one
135
136    LayerEntry entry(width, height);
137    if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) {
138        return true;
139    }
140
141    uint32_t oldWidth = layer->getWidth();
142    uint32_t oldHeight = layer->getHeight();
143
144    Caches::getInstance().activeTexture(0);
145    layer->bindTexture();
146    layer->setSize(entry.mWidth, entry.mHeight);
147    layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
148
149    if (glGetError() != GL_NO_ERROR) {
150        layer->setSize(oldWidth, oldHeight);
151        return false;
152    }
153
154    return true;
155}
156
157bool LayerCache::put(Layer* layer) {
158    if (!layer->isCacheable()) return false;
159
160    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
161    // Don't even try to cache a layer that's bigger than the cache
162    if (size < mMaxSize) {
163        // TODO: Use an LRU
164        while (mSize + size > mMaxSize) {
165            size_t position = 0;
166#if LAYER_REMOVE_BIGGEST_FIRST
167            position = mCache.size() - 1;
168#endif
169            Layer* victim = mCache.itemAt(position).mLayer;
170            deleteLayer(victim);
171            mCache.removeAt(position);
172
173            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
174                    victim->layer.getHeight());
175        }
176
177        LayerEntry entry(layer);
178
179        mCache.add(entry);
180        mSize += size;
181
182        return true;
183    }
184    return false;
185}
186
187}; // namespace uirenderer
188}; // namespace android
189