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, fbo %d", layer->getWidth(), layer->getHeight(),
73                layer->getFbo());
74        mSize -= layer->getWidth() * layer->getHeight() * 4;
75        Caches::getInstance().resourceCache.decrementRefcount(layer);
76    }
77}
78
79void LayerCache::clear() {
80    size_t count = mCache.size();
81    for (size_t i = 0; i < count; i++) {
82        deleteLayer(mCache.itemAt(i).mLayer);
83    }
84    mCache.clear();
85}
86
87Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
88    Layer* layer = NULL;
89
90    LayerEntry entry(width, height);
91    ssize_t index = mCache.indexOf(entry);
92
93    if (index >= 0) {
94        entry = mCache.itemAt(index);
95        mCache.removeAt(index);
96
97        layer = entry.mLayer;
98        mSize -= layer->getWidth() * layer->getHeight() * 4;
99
100        LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight());
101    } else {
102        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
103
104        layer = new Layer(entry.mWidth, entry.mHeight);
105        layer->setBlend(true);
106        layer->setEmpty(true);
107        layer->setFbo(0);
108
109        layer->generateTexture();
110        layer->bindTexture();
111        layer->setFilter(GL_NEAREST);
112        layer->setWrap(GL_CLAMP_TO_EDGE, false);
113        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
114
115#if DEBUG_LAYERS
116        dump();
117#endif
118    }
119
120    return layer;
121}
122
123void LayerCache::dump() {
124    size_t size = mCache.size();
125    for (size_t i = 0; i < size; i++) {
126        const LayerEntry& entry = mCache.itemAt(i);
127        LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
128    }
129}
130
131bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) {
132    // TODO: We should be smarter and see if we have a texture of the appropriate
133    //       size already in the cache, and reuse it instead of creating a new one
134
135    LayerEntry entry(width, height);
136    if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) {
137        return true;
138    }
139
140    uint32_t oldWidth = layer->getWidth();
141    uint32_t oldHeight = layer->getHeight();
142
143    Caches::getInstance().activeTexture(0);
144    layer->bindTexture();
145    layer->setSize(entry.mWidth, entry.mHeight);
146    layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
147
148    if (glGetError() != GL_NO_ERROR) {
149        layer->setSize(oldWidth, oldHeight);
150        return false;
151    }
152
153    return true;
154}
155
156bool LayerCache::put(Layer* layer) {
157    if (!layer->isCacheable()) return false;
158
159    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
160    // Don't even try to cache a layer that's bigger than the cache
161    if (size < mMaxSize) {
162        // TODO: Use an LRU
163        while (mSize + size > mMaxSize) {
164            size_t position = 0;
165#if LAYER_REMOVE_BIGGEST_FIRST
166            position = mCache.size() - 1;
167#endif
168            Layer* victim = mCache.itemAt(position).mLayer;
169            deleteLayer(victim);
170            mCache.removeAt(position);
171
172            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
173                    victim->layer.getHeight());
174        }
175
176        layer->deferredUpdateScheduled = false;
177        layer->renderer = NULL;
178        layer->displayList = NULL;
179
180        LayerEntry entry(layer);
181
182        mCache.add(entry);
183        mSize += size;
184
185        return true;
186    }
187    return false;
188}
189
190}; // namespace uirenderer
191}; // namespace android
192