LayerCache.cpp revision e91080581f467d55913a8c5ab53dedc2dab2e5b6 
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 "LayerCache.h"
24#include "Properties.h"
25
26namespace android {
27namespace uirenderer {
28
29///////////////////////////////////////////////////////////////////////////////
30// Constructors/destructor
31///////////////////////////////////////////////////////////////////////////////
32
33LayerCache::LayerCache(): mSize(0), mMaxSize(MB(DEFAULT_LAYER_CACHE_SIZE)) {
34    char property[PROPERTY_VALUE_MAX];
35    if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) {
36        LOGD("  Setting layer cache size to %sMB", property);
37        setMaxSize(MB(atof(property)));
38    } else {
39        LOGD("  Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE);
40    }
41}
42
43LayerCache::~LayerCache() {
44    clear();
45}
46
47///////////////////////////////////////////////////////////////////////////////
48// Size management
49///////////////////////////////////////////////////////////////////////////////
50
51uint32_t LayerCache::getSize() {
52    return mSize;
53}
54
55uint32_t LayerCache::getMaxSize() {
56    return mMaxSize;
57}
58
59void LayerCache::setMaxSize(uint32_t maxSize) {
60    clear();
61    mMaxSize = maxSize;
62}
63
64///////////////////////////////////////////////////////////////////////////////
65// Caching
66///////////////////////////////////////////////////////////////////////////////
67
68void LayerCache::deleteLayer(Layer* layer) {
69    if (layer) {
70        mSize -= layer->width * layer->height * 4;
71        glDeleteTextures(1, &layer->texture);
72        delete layer;
73    }
74}
75
76void LayerCache::clear() {
77    size_t count = mCache.size();
78    for (size_t i = 0; i < count; i++) {
79        deleteLayer(mCache.itemAt(i).mLayer);
80    }
81    mCache.clear();
82}
83
84Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
85    Layer* layer = NULL;
86
87    LayerEntry entry(width, height);
88    ssize_t index = mCache.indexOf(entry);
89
90    if (index >= 0) {
91        entry = mCache.itemAt(index);
92        mCache.removeAt(index);
93
94        layer = entry.mLayer;
95        mSize -= layer->width * layer->height * 4;
96
97        LAYER_LOGD("Reusing layer %dx%d", layer->width, layer->height);
98    } else {
99        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
100
101        layer = new Layer(entry.mWidth, entry.mHeight);
102        layer->blend = true;
103        layer->empty = true;
104        layer->fbo = 0;
105
106        glGenTextures(1, &layer->texture);
107        glBindTexture(GL_TEXTURE_2D, layer->texture);
108
109        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
110
111        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
112        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
113
114        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
115        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
116
117#if DEBUG_LAYERS
118        size_t size = mCache.size();
119        for (size_t i = 0; i < size; i++) {
120            const LayerEntry& entry = mCache.itemAt(i);
121            LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
122        }
123#endif
124    }
125
126    return layer;
127}
128
129bool LayerCache::put(Layer* layer) {
130    const uint32_t size = layer->width * layer->height * 4;
131    // Don't even try to cache a layer that's bigger than the cache
132    if (size < mMaxSize) {
133        // TODO: Use an LRU
134        while (mSize + size > mMaxSize) {
135            size_t position = 0;
136#if LAYER_REMOVE_BIGGEST
137            position = mCache.size() - 1;
138#endif
139            Layer* victim = mCache.itemAt(position).mLayer;
140            deleteLayer(victim);
141            mCache.removeAt(position);
142
143            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
144                    victim->layer.getHeight());
145        }
146
147        LayerEntry entry(layer);
148
149        mCache.add(entry);
150        mSize += size;
151
152        return true;
153    }
154    return false;
155}
156
157}; // namespace uirenderer
158}; // namespace android
159