TextDropShadowCache.cpp revision 69fcbccf476ffc55af4da4dfedc72c3de8f91ce8
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