LayerCache.cpp revision 09b7c91de73b59aa3f679b3ae3ba299f82ec9f8a 
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->width * layer->height * 4;
72        glDeleteTextures(1, &layer->texture);
73        delete layer;
74    }
75}
76
77void LayerCache::clear() {
78    size_t count = mCache.size();
79    for (size_t i = 0; i < count; i++) {
80        deleteLayer(mCache.itemAt(i).mLayer);
81    }
82    mCache.clear();
83}
84
85Layer* LayerCache::get(const uint32_t width, const uint32_t height) {
86    Layer* layer = NULL;
87
88    LayerEntry entry(width, height);
89    ssize_t index = mCache.indexOf(entry);
90
91    if (index >= 0) {
92        entry = mCache.itemAt(index);
93        mCache.removeAt(index);
94
95        layer = entry.mLayer;
96        mSize -= layer->width * layer->height * 4;
97
98        LAYER_LOGD("Reusing layer %dx%d", layer->width, layer->height);
99    } else {
100        LAYER_LOGD("Creating new layer %dx%d", entry.mWidth, entry.mHeight);
101
102        layer = new Layer(entry.mWidth, entry.mHeight);
103        layer->blend = true;
104        layer->empty = true;
105        layer->fbo = 0;
106        layer->colorFilter = NULL;
107
108        glGenTextures(1, &layer->texture);
109        glBindTexture(GL_TEXTURE_2D, layer->texture);
110
111        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
112
113        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
114        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
115
116        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
117        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
118
119#if DEBUG_LAYERS
120        size_t size = mCache.size();
121        for (size_t i = 0; i < size; i++) {
122            const LayerEntry& entry = mCache.itemAt(i);
123            LAYER_LOGD("  Layer size %dx%d", entry.mWidth, entry.mHeight);
124        }
125#endif
126    }
127
128    return layer;
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->width && entry.mHeight <= layer->height) {
137        return true;
138    }
139
140    glActiveTexture(GL_TEXTURE0);
141    glBindTexture(GL_TEXTURE_2D, layer->texture);
142
143    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, entry.mWidth, entry.mHeight, 0,
144            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
145
146    if (glGetError() != GL_NO_ERROR) {
147        return false;
148    }
149
150    layer->width = entry.mWidth;
151    layer->height = entry.mHeight;
152
153    return true;
154}
155
156bool LayerCache::put(Layer* layer) {
157    const uint32_t size = layer->width * layer->height * 4;
158    // Don't even try to cache a layer that's bigger than the cache
159    if (size < mMaxSize) {
160        // TODO: Use an LRU
161        while (mSize + size > mMaxSize) {
162            size_t position = 0;
163#if LAYER_REMOVE_BIGGEST
164            position = mCache.size() - 1;
165#endif
166            Layer* victim = mCache.itemAt(position).mLayer;
167            deleteLayer(victim);
168            mCache.removeAt(position);
169
170            LAYER_LOGD("  Deleting layer %.2fx%.2f", victim->layer.getWidth(),
171                    victim->layer.getHeight());
172        }
173
174        LayerEntry entry(layer);
175
176        mCache.add(entry);
177        mSize += size;
178
179        return true;
180    }
181    return false;
182}
183
184}; // namespace uirenderer
185}; // namespace android
186