TextDropShadowCache.cpp revision 2dc236b2bae13b9a0ed9b3f7320502aecd7983b3
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 "Caches.h" 22#include "Debug.h" 23#include "FontRenderer.h" 24#include "TextDropShadowCache.h" 25#include "Properties.h" 26 27namespace android { 28namespace uirenderer { 29 30/////////////////////////////////////////////////////////////////////////////// 31// Cache support 32/////////////////////////////////////////////////////////////////////////////// 33 34hash_t ShadowText::hash() const { 35 uint32_t charCount = len / sizeof(char16_t); 36 uint32_t hash = JenkinsHashMix(0, len); 37 hash = JenkinsHashMix(hash, android::hash_type(radius)); 38 hash = JenkinsHashMix(hash, android::hash_type(textSize)); 39 hash = JenkinsHashMix(hash, android::hash_type(typeface)); 40 hash = JenkinsHashMix(hash, flags); 41 hash = JenkinsHashMix(hash, android::hash_type(italicStyle)); 42 hash = JenkinsHashMix(hash, android::hash_type(scaleX)); 43 if (text) { 44 hash = JenkinsHashMixShorts(hash, text, charCount); 45 } 46 if (positions) { 47 for (uint32_t i = 0; i < charCount * 2; i++) { 48 hash = JenkinsHashMix(hash, android::hash_type(positions[i])); 49 } 50 } 51 return JenkinsHashWhiten(hash); 52} 53 54int ShadowText::compare(const ShadowText& lhs, const ShadowText& rhs) { 55 int deltaInt = int(lhs.len) - int(rhs.len); 56 if (deltaInt != 0) return deltaInt; 57 58 deltaInt = lhs.flags - rhs.flags; 59 if (deltaInt != 0) return deltaInt; 60 61 if (lhs.radius < rhs.radius) return -1; 62 if (lhs.radius > rhs.radius) return +1; 63 64 if (lhs.typeface < rhs.typeface) return -1; 65 if (lhs.typeface > rhs.typeface) return +1; 66 67 if (lhs.textSize < rhs.textSize) return -1; 68 if (lhs.textSize > rhs.textSize) return +1; 69 70 if (lhs.italicStyle < rhs.italicStyle) return -1; 71 if (lhs.italicStyle > rhs.italicStyle) return +1; 72 73 if (lhs.scaleX < rhs.scaleX) return -1; 74 if (lhs.scaleX > rhs.scaleX) return +1; 75 76 if (lhs.text != rhs.text) { 77 if (!lhs.text) return -1; 78 if (!rhs.text) return +1; 79 80 deltaInt = memcmp(lhs.text, rhs.text, lhs.len); 81 if (deltaInt != 0) return deltaInt; 82 } 83 84 if (lhs.positions != rhs.positions) { 85 if (!lhs.positions) return -1; 86 if (!rhs.positions) return +1; 87 88 return memcmp(lhs.positions, rhs.positions, lhs.len << 2); 89 } 90 91 return 0; 92} 93 94/////////////////////////////////////////////////////////////////////////////// 95// Constructors/destructor 96/////////////////////////////////////////////////////////////////////////////// 97 98TextDropShadowCache::TextDropShadowCache(): 99 mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity), 100 mSize(0), mMaxSize(MB(DEFAULT_DROP_SHADOW_CACHE_SIZE)) { 101 char property[PROPERTY_VALUE_MAX]; 102 if (property_get(PROPERTY_DROP_SHADOW_CACHE_SIZE, property, NULL) > 0) { 103 INIT_LOGD(" Setting drop shadow cache size to %sMB", property); 104 setMaxSize(MB(atof(property))); 105 } else { 106 INIT_LOGD(" Using default drop shadow cache size of %.2fMB", 107 DEFAULT_DROP_SHADOW_CACHE_SIZE); 108 } 109 110 init(); 111} 112 113TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize): 114 mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity), 115 mSize(0), mMaxSize(maxByteSize) { 116 init(); 117} 118 119TextDropShadowCache::~TextDropShadowCache() { 120 mCache.clear(); 121} 122 123void TextDropShadowCache::init() { 124 mCache.setOnEntryRemovedListener(this); 125 mDebugEnabled = readDebugLevel() & kDebugMoreCaches; 126} 127 128/////////////////////////////////////////////////////////////////////////////// 129// Size management 130/////////////////////////////////////////////////////////////////////////////// 131 132uint32_t TextDropShadowCache::getSize() { 133 return mSize; 134} 135 136uint32_t TextDropShadowCache::getMaxSize() { 137 return mMaxSize; 138} 139 140void TextDropShadowCache::setMaxSize(uint32_t maxSize) { 141 mMaxSize = maxSize; 142 while (mSize > mMaxSize) { 143 mCache.removeOldest(); 144 } 145} 146 147/////////////////////////////////////////////////////////////////////////////// 148// Callbacks 149/////////////////////////////////////////////////////////////////////////////// 150 151void TextDropShadowCache::operator()(ShadowText&, ShadowTexture*& texture) { 152 if (texture) { 153 mSize -= texture->bitmapSize; 154 155 if (mDebugEnabled) { 156 ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize); 157 } 158 159 texture->deleteTexture(); 160 delete texture; 161 } 162} 163 164/////////////////////////////////////////////////////////////////////////////// 165// Caching 166/////////////////////////////////////////////////////////////////////////////// 167 168void TextDropShadowCache::clear() { 169 mCache.clear(); 170} 171 172ShadowTexture* TextDropShadowCache::get(const SkPaint* paint, const char* text, uint32_t len, 173 int numGlyphs, float radius, const float* positions) { 174 ShadowText entry(paint, radius, len, text, positions); 175 ShadowTexture* texture = mCache.get(entry); 176 177 if (!texture) { 178 SkPaint paintCopy(*paint); 179 paintCopy.setTextAlign(SkPaint::kLeft_Align); 180 FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, text, 0, 181 len, numGlyphs, radius, positions); 182 183 if (!shadow.image) { 184 return NULL; 185 } 186 187 Caches& caches = Caches::getInstance(); 188 189 texture = new ShadowTexture(caches); 190 texture->left = shadow.penX; 191 texture->top = shadow.penY; 192 texture->width = shadow.width; 193 texture->height = shadow.height; 194 texture->generation = 0; 195 texture->blend = true; 196 197 const uint32_t size = shadow.width * shadow.height; 198 texture->bitmapSize = size; 199 200 // Don't even try to cache a bitmap that's bigger than the cache 201 if (size < mMaxSize) { 202 while (mSize + size > mMaxSize) { 203 mCache.removeOldest(); 204 } 205 } 206 207 glGenTextures(1, &texture->id); 208 209 caches.bindTexture(texture->id); 210 // Textures are Alpha8 211 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 212 213 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texture->width, texture->height, 0, 214 GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image); 215 216 texture->setFilter(GL_LINEAR); 217 texture->setWrap(GL_CLAMP_TO_EDGE); 218 219 if (size < mMaxSize) { 220 if (mDebugEnabled) { 221 ALOGD("Shadow texture created, size = %d", texture->bitmapSize); 222 } 223 224 entry.copyTextLocally(); 225 226 mSize += size; 227 mCache.put(entry, texture); 228 } else { 229 texture->cleanup = true; 230 } 231 232 // Cleanup shadow 233 free(shadow.image); 234 } 235 236 return texture; 237} 238 239}; // namespace uirenderer 240}; // namespace android 241