TextDropShadowCache.cpp revision 5baa3a62a97544669fba6d65a11c07f252e654dd 
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 "Debug.h"
20#include "TextDropShadowCache.h"
21#include "Properties.h"
22
23namespace android {
24namespace uirenderer {
25
26///////////////////////////////////////////////////////////////////////////////
27// Constructors/destructor
28///////////////////////////////////////////////////////////////////////////////
29
30TextDropShadowCache::TextDropShadowCache():
31        mCache(GenerationCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
32        mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
33    char property[PROPERTY_VALUE_MAX];
34    if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, NULL) > 0) {
35        INIT_LOGD("  Setting drop shadow cache size to %sMB", property);
36        setMaxSize(MB(atof(property)));
37    } else {
38        INIT_LOGD("  Using default drop shadow cache size of %.2fMB",
39                DEFAULT_DROP_SHADOW_CACHE_SIZE);
40    }
41
42    init();
43}
44
45TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
46        mCache(GenerationCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
47        mSize(0), mMaxSize(maxByteSize) {
48    init();
49}
50
51TextDropShadowCache::~TextDropShadowCache() {
52    mCache.clear();
53}
54
55void TextDropShadowCache::init() {
56    mCache.setOnEntryRemovedListener(this);
57    mDebugEnabled = readDebugLevel() & kDebugMoreCaches;
58}
59
60///////////////////////////////////////////////////////////////////////////////
61// Size management
62///////////////////////////////////////////////////////////////////////////////
63
64uint32_t TextDropShadowCache::getSize() {
65    return mSize;
66}
67
68uint32_t TextDropShadowCache::getMaxSize() {
69    return mMaxSize;
70}
71
72void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
73    mMaxSize = maxSize;
74    while (mSize > mMaxSize) {
75        mCache.removeOldest();
76    }
77}
78
79///////////////////////////////////////////////////////////////////////////////
80// Callbacks
81///////////////////////////////////////////////////////////////////////////////
82
83void TextDropShadowCache::operator()(ShadowText& text, ShadowTexture*& texture) {
84    if (texture) {
85        mSize -= texture->bitmapSize;
86
87        if (mDebugEnabled) {
88            ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize);
89        }
90
91        glDeleteTextures(1, &texture->id);
92        delete texture;
93    }
94}
95
96///////////////////////////////////////////////////////////////////////////////
97// Caching
98///////////////////////////////////////////////////////////////////////////////
99
100void TextDropShadowCache::clear() {
101    mCache.clear();
102}
103
104ShadowTexture* TextDropShadowCache::get(SkPaint* paint, const char* text, uint32_t len,
105        int numGlyphs, uint32_t radius) {
106    ShadowText entry(paint, radius, len, text);
107    ShadowTexture* texture = mCache.get(entry);
108
109    if (!texture) {
110        FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(paint, text, 0,
111                len, numGlyphs, radius);
112
113        texture = new ShadowTexture;
114        texture->left = shadow.penX;
115        texture->top = shadow.penY;
116        texture->width = shadow.width;
117        texture->height = shadow.height;
118        texture->generation = 0;
119        texture->blend = true;
120
121        const uint32_t size = shadow.width * shadow.height;
122        texture->bitmapSize = size;
123
124        // Don't even try to cache a bitmap that's bigger than the cache
125        if (size < mMaxSize) {
126            while (mSize + size > mMaxSize) {
127                mCache.removeOldest();
128            }
129        }
130
131        glGenTextures(1, &texture->id);
132
133        glBindTexture(GL_TEXTURE_2D, texture->id);
134        // Textures are Alpha8
135        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
136
137        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
138                GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
139
140        texture->setFilter(GL_LINEAR);
141        texture->setWrap(GL_CLAMP_TO_EDGE);
142
143        if (size < mMaxSize) {
144            if (mDebugEnabled) {
145                ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
146            }
147
148            entry.copyTextLocally();
149
150            mSize += size;
151            mCache.put(entry, texture);
152        } else {
153            texture->cleanup = true;
154        }
155
156        // Cleanup shadow
157        delete[] shadow.image;
158    }
159
160    return texture;
161}
162
163}; // namespace uirenderer
164}; // namespace android
165