TextDropShadowCache.cpp revision f2d8ccc15d7272b3416f73605c1f31d1d346bd40 
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 <utils/JenkinsHash.h>
20
21#include "Debug.h"
22#include "TextDropShadowCache.h"
23#include "Properties.h"
24
25namespace android {
26namespace uirenderer {
27
28///////////////////////////////////////////////////////////////////////////////
29// Cache support
30///////////////////////////////////////////////////////////////////////////////
31
32hash_t ShadowText::hash() const {
33    uint32_t charCount = len / sizeof(char16_t);
34    uint32_t hash = JenkinsHashMix(0, len);
35    hash = JenkinsHashMix(hash, android::hash_type(radius));
36    hash = JenkinsHashMix(hash, android::hash_type(textSize));
37    hash = JenkinsHashMix(hash, android::hash_type(typeface));
38    hash = JenkinsHashMix(hash, flags);
39    hash = JenkinsHashMix(hash, android::hash_type(italicStyle));
40    hash = JenkinsHashMix(hash, android::hash_type(scaleX));
41    if (text) {
42        hash = JenkinsHashMixShorts(hash, text, charCount);
43    }
44    if (positions) {
45        for (uint32_t i = 0; i < charCount * 2; i++) {
46            hash = JenkinsHashMix(hash, android::hash_type(positions[i]));
47        }
48    }
49    return JenkinsHashWhiten(hash);
50}
51
52int ShadowText::compare(const ShadowText& lhs, const ShadowText& rhs) {
53    int deltaInt = int(lhs.len) - int(rhs.len);
54    if (deltaInt != 0) return deltaInt;
55
56    deltaInt = lhs.flags - rhs.flags;
57    if (deltaInt != 0) return deltaInt;
58
59    if (lhs.radius < rhs.radius) return -1;
60    if (lhs.radius > rhs.radius) return +1;
61
62    if (lhs.typeface < rhs.typeface) return -1;
63    if (lhs.typeface > rhs.typeface) return +1;
64
65    if (lhs.textSize < rhs.textSize) return -1;
66    if (lhs.textSize > rhs.textSize) return +1;
67
68    if (lhs.italicStyle < rhs.italicStyle) return -1;
69    if (lhs.italicStyle > rhs.italicStyle) return +1;
70
71    if (lhs.scaleX < rhs.scaleX) return -1;
72    if (lhs.scaleX > rhs.scaleX) return +1;
73
74    if (lhs.text != rhs.text) {
75        if (!lhs.text) return -1;
76        if (!rhs.text) return +1;
77
78        deltaInt = memcmp(lhs.text, rhs.text, lhs.len);
79        if (deltaInt != 0) return deltaInt;
80    }
81
82    if (lhs.positions != rhs.positions) {
83        if (!lhs.positions) return -1;
84        if (!rhs.positions) return +1;
85
86        return memcmp(lhs.positions, rhs.positions, lhs.len << 2);
87    }
88
89    return 0;
90}
91
92///////////////////////////////////////////////////////////////////////////////
93// Constructors/destructor
94///////////////////////////////////////////////////////////////////////////////
95
96TextDropShadowCache::TextDropShadowCache():
97        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
98        mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) {
99    char property[PROPERTY_VALUE_MAX];
100    if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, NULL) > 0) {
101        INIT_LOGD("  Setting drop shadow cache size to %sMB", property);
102        setMaxSize(MB(atof(property)));
103    } else {
104        INIT_LOGD("  Using default drop shadow cache size of %.2fMB",
105                DEFAULT_DROP_SHADOW_CACHE_SIZE);
106    }
107
108    init();
109}
110
111TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
112        mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
113        mSize(0), mMaxSize(maxByteSize) {
114    init();
115}
116
117TextDropShadowCache::~TextDropShadowCache() {
118    mCache.clear();
119}
120
121void TextDropShadowCache::init() {
122    mCache.setOnEntryRemovedListener(this);
123    mDebugEnabled = readDebugLevel() & kDebugMoreCaches;
124}
125
126///////////////////////////////////////////////////////////////////////////////
127// Size management
128///////////////////////////////////////////////////////////////////////////////
129
130uint32_t TextDropShadowCache::getSize() {
131    return mSize;
132}
133
134uint32_t TextDropShadowCache::getMaxSize() {
135    return mMaxSize;
136}
137
138void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
139    mMaxSize = maxSize;
140    while (mSize > mMaxSize) {
141        mCache.removeOldest();
142    }
143}
144
145///////////////////////////////////////////////////////////////////////////////
146// Callbacks
147///////////////////////////////////////////////////////////////////////////////
148
149void TextDropShadowCache::operator()(ShadowText& text, ShadowTexture*& texture) {
150    if (texture) {
151        mSize -= texture->bitmapSize;
152
153        if (mDebugEnabled) {
154            ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize);
155        }
156
157        glDeleteTextures(1, &texture->id);
158        delete texture;
159    }
160}
161
162///////////////////////////////////////////////////////////////////////////////
163// Caching
164///////////////////////////////////////////////////////////////////////////////
165
166void TextDropShadowCache::clear() {
167    mCache.clear();
168}
169
170ShadowTexture* TextDropShadowCache::get(SkPaint* paint, const char* text, uint32_t len,
171        int numGlyphs, float radius, const float* positions) {
172    ShadowText entry(paint, radius, len, text, positions);
173    ShadowTexture* texture = mCache.get(entry);
174
175    if (!texture) {
176        SkPaint paintCopy(*paint);
177        paintCopy.setTextAlign(SkPaint::kLeft_Align);
178        FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, text, 0,
179                len, numGlyphs, radius, positions);
180
181        texture = new ShadowTexture;
182        texture->left = shadow.penX;
183        texture->top = shadow.penY;
184        texture->width = shadow.width;
185        texture->height = shadow.height;
186        texture->generation = 0;
187        texture->blend = true;
188
189        const uint32_t size = shadow.width * shadow.height;
190        texture->bitmapSize = size;
191
192        // Don't even try to cache a bitmap that's bigger than the cache
193        if (size < mMaxSize) {
194            while (mSize + size > mMaxSize) {
195                mCache.removeOldest();
196            }
197        }
198
199        glGenTextures(1, &texture->id);
200
201        glBindTexture(GL_TEXTURE_2D, texture->id);
202        // Textures are Alpha8
203        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
204
205        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
206                GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
207
208        texture->setFilter(GL_LINEAR);
209        texture->setWrap(GL_CLAMP_TO_EDGE);
210
211        if (size < mMaxSize) {
212            if (mDebugEnabled) {
213                ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
214            }
215
216            entry.copyTextLocally();
217
218            mSize += size;
219            mCache.put(entry, texture);
220        } else {
221            texture->cleanup = true;
222        }
223
224        // Cleanup shadow
225        delete shadow.image;
226    }
227
228    return texture;
229}
230
231}; // namespace uirenderer
232}; // namespace android
233