LayerCache.cpp revision 912a7b32d0c59ba38265c5dd6ff84ce93f909a7f 
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 "Debug.h"
24#include "LayerCache.h"
25#include "Properties.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Constructors/destructor
32///////////////////////////////////////////////////////////////////////////////
33
34LayerCache::LayerCache(): mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) {
35    char property[PROPERTY_VALUE_MAX];
36    if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) {
37        INIT_LOGD("  Setting layer cache size to %sMB", property);
38        setMaxSize(MB(atof(property)));
39    } else {
40        INIT_LOGD("  Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE);
41    }
42}
43
44LayerCache::~LayerCache() {
45    clear();
46}
47
48///////////////////////////////////////////////////////////////////////////////
49// Size management
50///////////////////////////////////////////////////////////////////////////////
51
52uint32_t LayerCache::getSize() {
53    return mSize;
54}
55
56uint32_t LayerCache::getMaxSize() {
57    return mMaxSize;
58}
59
60void LayerCache::setMaxSize(uint32_t maxSize) {
61    clear();
62    mMaxSize = maxSize;
63}
64
65///////////////////////////////////////////////////////////////////////////////
66// Caching
67///////////////////////////////////////////////////////////////////////////////
68
69void LayerCache::deleteLayer(Layer* layer) {
70    if (layer) {
71        mSize -= layer->getWidth() * layer->getHeight() * 4;
72        layer->deleteFbo();
73        layer->deleteTexture();
74        delete layer;
75    }
76}
77
78void LayerCache::clear() {
79    size_t count = mCache.size();
80    for (size_t i = 0; i < count; i++) {
81        deleteLayer(mCache.itemAt(i).mLayer);
82    }
83    mCache.clear();
84}
85
86Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
87    Layer* layer = NULL;
88
89    LayerEntry entry(width, height);
90    ssize_t index = mCache.indexOf(entry);
91
92    if (index >= 0) {
93        entry = mCache.itemAt(index);
94        mCache.removeAt(index);
95
96        layer = entry.mLayer;
97        mSize -= layer->getWidth() * layer->getHeight() * 4;
98
99        LAYER_LOGD("Reusing layer %dx%d", layer->getWidth(), layer->getHeight());
100    } else {
101        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
102
103        layer = new Layer(entry.mWidth, entry.mHeight);
104        layer->setBlend(true);
105        layer->setEmpty(true);
106        layer->setFbo(0);
107
108        layer->generateTexture();
109        layer->bindTexture();
110        layer->setFilter(GL_NEAREST, GL_NEAREST);
111        layer->setWrap(GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, false);
112        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
113
114#if DEBUG_LAYERS
115        size_t size = mCache.size();
116        for (size_t i = 0; i < size; i++) {
117            const LayerEntry& entry = mCache.itemAt(i);
118            LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
119        }
120#endif
121    }
122
123    return layer;
124}
125
126bool LayerCache::resize(Layer* layer, const uint32_t width, const uint32_t height) {
127    // TODO: We should be smarter and see if we have a texture of the appropriate
128    //       size already in the cache, and reuse it instead of creating a new one
129
130    LayerEntry entry(width, height);
131    if (entry.mWidth <= layer->getWidth() && entry.mHeight <= layer->getHeight()) {
132        return true;
133    }
134
135    uint32_t oldWidth = layer->getWidth();
136    uint32_t oldHeight = layer->getHeight();
137
138    glActiveTexture(GL_TEXTURE0);
139    layer->bindTexture();
140    layer->setSize(entry.mWidth, entry.mHeight);
141    layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
142
143    if (glGetError() != GL_NO_ERROR) {
144        layer->setSize(oldWidth, oldHeight);
145        return false;
146    }
147
148    return true;
149}
150
151bool LayerCache::put(Layer* layer) {
152    if (!layer->isCacheable()) return false;
153
154    const uint32_t size = layer->getWidth() * layer->getHeight() * 4;
155    // Don't even try to cache a layer that's bigger than the cache
156    if (size < mMaxSize) {
157        // TODO: Use an LRU
158        while (mSize + size > mMaxSize) {
159            size_t position = 0;
160#if LAYER_REMOVE_BIGGEST
161            position = mCache.size() - 1;
162#endif
163            Layer* victim = mCache.itemAt(position).mLayer;
164            deleteLayer(victim);
165            mCache.removeAt(position);
166
167            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
168                    victim->layer.getHeight());
169        }
170
171        LayerEntry entry(layer);
172
173        mCache.add(entry);
174        mSize += size;
175
176        return true;
177    }
178    return false;
179}
180
181}; // namespace uirenderer
182}; // namespace android
183