TextureCache.cpp revision 1e79386ba34f0db38c1b35b22cdf122632534354 
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 "TextureCache.h"
22
23namespace android {
24namespace uirenderer {
25
26///////////////////////////////////////////////////////////////////////////////
27// Constructors/destructor
28///////////////////////////////////////////////////////////////////////////////
29
30TextureCache::TextureCache(uint32_t maxByteSize):
31        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
32        mSize(0), mMaxSize(maxByteSize) {
33    mCache.setOnEntryRemovedListener(this);
34}
35
36TextureCache::~TextureCache() {
37    mCache.clear();
38}
39
40///////////////////////////////////////////////////////////////////////////////
41// Size management
42///////////////////////////////////////////////////////////////////////////////
43
44uint32_t TextureCache::getSize() {
45    return mSize;
46}
47
48uint32_t TextureCache::getMaxSize() {
49    return mMaxSize;
50}
51
52void TextureCache::setMaxSize(uint32_t maxSize) {
53    mMaxSize = maxSize;
54    while (mSize > mMaxSize) {
55        mCache.removeOldest();
56    }
57}
58
59///////////////////////////////////////////////////////////////////////////////
60// Callbacks
61///////////////////////////////////////////////////////////////////////////////
62
63void TextureCache::operator()(SkBitmap*& bitmap, Texture*& texture) {
64    if (bitmap) {
65        const uint32_t size = bitmap->rowBytes() * bitmap->height();
66        mSize -= size;
67    }
68
69    if (texture) {
70        glDeleteTextures(1, &texture->id);
71        delete texture;
72    }
73}
74
75///////////////////////////////////////////////////////////////////////////////
76// Caching
77///////////////////////////////////////////////////////////////////////////////
78
79Texture* TextureCache::get(SkBitmap* bitmap) {
80    Texture* texture = mCache.get(bitmap);
81    if (!texture) {
82        const uint32_t size = bitmap->rowBytes() * bitmap->height();
83        // Don't even try to cache a bitmap that's bigger than the cache
84        if (size < mMaxSize) {
85            while (mSize + size > mMaxSize) {
86                mCache.removeOldest();
87            }
88        }
89
90        texture = new Texture;
91        generateTexture(bitmap, texture, false);
92
93        if (size < mMaxSize) {
94            mSize += size;
95            mCache.put(bitmap, texture);
96        }
97    } else if (bitmap->getGenerationID() != texture->generation) {
98        generateTexture(bitmap, texture, true);
99    }
100    return texture;
101}
102
103void TextureCache::remove(SkBitmap* bitmap) {
104    mCache.remove(bitmap);
105}
106
107void TextureCache::clear() {
108    mCache.clear();
109}
110
111void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
112    SkAutoLockPixels alp(*bitmap);
113    if (!bitmap->readyToDraw()) {
114        LOGE("Cannot generate texture from bitmap");
115        return;
116    }
117
118    if (!regenerate) {
119        texture->generation = bitmap->getGenerationID();
120        texture->width = bitmap->width();
121        texture->height = bitmap->height();
122
123        glGenTextures(1, &texture->id);
124    }
125
126    glBindTexture(GL_TEXTURE_2D, texture->id);
127    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
128
129    switch (bitmap->getConfig()) {
130    case SkBitmap::kRGB_565_Config:
131        texture->blend = false;
132        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmap->rowBytesAsPixels(), texture->height, 0,
133                GL_RGB, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
134        break;
135    case SkBitmap::kARGB_8888_Config:
136        texture->blend = !bitmap->isOpaque();
137        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
138                GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
139        break;
140    default:
141        break;
142    }
143
144    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
145    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
146
147    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
148    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
149}
150
151}; // namespace uirenderer
152}; // namespace android
153