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
25 namespace android {
26 namespace uirenderer {
27
28 ///////////////////////////////////////////////////////////////////////////////
29 // Cache support
30 ///////////////////////////////////////////////////////////////////////////////
31
hash() const32 hash_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
compare(const ShadowText & lhs,const ShadowText & rhs)52 int 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
TextDropShadowCache()96 TextDropShadowCache::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
TextDropShadowCache(uint32_t maxByteSize)111 TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize):
112 mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity),
113 mSize(0), mMaxSize(maxByteSize) {
114 init();
115 }
116
~TextDropShadowCache()117 TextDropShadowCache::~TextDropShadowCache() {
118 mCache.clear();
119 }
120
init()121 void TextDropShadowCache::init() {
122 mCache.setOnEntryRemovedListener(this);
123 mDebugEnabled = readDebugLevel() & kDebugMoreCaches;
124 }
125
126 ///////////////////////////////////////////////////////////////////////////////
127 // Size management
128 ///////////////////////////////////////////////////////////////////////////////
129
getSize()130 uint32_t TextDropShadowCache::getSize() {
131 return mSize;
132 }
133
getMaxSize()134 uint32_t TextDropShadowCache::getMaxSize() {
135 return mMaxSize;
136 }
137
setMaxSize(uint32_t maxSize)138 void TextDropShadowCache::setMaxSize(uint32_t maxSize) {
139 mMaxSize = maxSize;
140 while (mSize > mMaxSize) {
141 mCache.removeOldest();
142 }
143 }
144
145 ///////////////////////////////////////////////////////////////////////////////
146 // Callbacks
147 ///////////////////////////////////////////////////////////////////////////////
148
operator ()(ShadowText & text,ShadowTexture * & texture)149 void 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
clear()166 void TextDropShadowCache::clear() {
167 mCache.clear();
168 }
169
get(SkPaint * paint,const char * text,uint32_t len,int numGlyphs,float radius,const float * positions)170 ShadowTexture* 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 if (!shadow.image) {
182 return NULL;
183 }
184
185 texture = new ShadowTexture;
186 texture->left = shadow.penX;
187 texture->top = shadow.penY;
188 texture->width = shadow.width;
189 texture->height = shadow.height;
190 texture->generation = 0;
191 texture->blend = true;
192
193 const uint32_t size = shadow.width * shadow.height;
194 texture->bitmapSize = size;
195
196 // Don't even try to cache a bitmap that's bigger than the cache
197 if (size < mMaxSize) {
198 while (mSize + size > mMaxSize) {
199 mCache.removeOldest();
200 }
201 }
202
203 glGenTextures(1, &texture->id);
204
205 glBindTexture(GL_TEXTURE_2D, texture->id);
206 // Textures are Alpha8
207 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
208
209 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0,
210 GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image);
211
212 texture->setFilter(GL_LINEAR);
213 texture->setWrap(GL_CLAMP_TO_EDGE);
214
215 if (size < mMaxSize) {
216 if (mDebugEnabled) {
217 ALOGD("Shadow texture created, size = %d", texture->bitmapSize);
218 }
219
220 entry.copyTextLocally();
221
222 mSize += size;
223 mCache.put(entry, texture);
224 } else {
225 texture->cleanup = true;
226 }
227
228 // Cleanup shadow
229 free(shadow.image);
230 }
231
232 return texture;
233 }
234
235 }; // namespace uirenderer
236 }; // namespace android
237