TextDropShadowCache.cpp revision 48a8f431fa52ae2ee25ffba9d20676f03bb710ff
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#include <utils/JenkinsHash.h> 18 19#include "Caches.h" 20#include "Debug.h" 21#include "FontRenderer.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 hash = JenkinsHashMix(0, glyphCount); 34 hash = JenkinsHashMix(hash, android::hash_type(radius)); 35 hash = JenkinsHashMix(hash, android::hash_type(textSize)); 36 hash = JenkinsHashMix(hash, android::hash_type(typeface)); 37 hash = JenkinsHashMix(hash, flags); 38 hash = JenkinsHashMix(hash, android::hash_type(italicStyle)); 39 hash = JenkinsHashMix(hash, android::hash_type(scaleX)); 40 if (text) { 41 hash = JenkinsHashMixShorts( 42 hash, reinterpret_cast<const uint16_t*>(text), glyphCount); 43 } 44 if (positions) { 45 for (uint32_t i = 0; i < glyphCount * 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.glyphCount) - int(rhs.glyphCount); 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.glyphCount * sizeof(glyph_t)); 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.glyphCount * sizeof(float) * 2); 87 } 88 89 return 0; 90} 91 92/////////////////////////////////////////////////////////////////////////////// 93// Constructors/destructor 94/////////////////////////////////////////////////////////////////////////////// 95 96TextDropShadowCache::TextDropShadowCache() 97 : TextDropShadowCache(Properties::textDropShadowCacheSize) {} 98 99TextDropShadowCache::TextDropShadowCache(uint32_t maxByteSize) 100 : mCache(LruCache<ShadowText, ShadowTexture*>::kUnlimitedCapacity) 101 , mSize(0) 102 , mMaxSize(maxByteSize) { 103 mCache.setOnEntryRemovedListener(this); 104 mDebugEnabled = Properties::debugLevel & kDebugMoreCaches; 105} 106 107TextDropShadowCache::~TextDropShadowCache() { 108 mCache.clear(); 109} 110 111/////////////////////////////////////////////////////////////////////////////// 112// Size management 113/////////////////////////////////////////////////////////////////////////////// 114 115uint32_t TextDropShadowCache::getSize() { 116 return mSize; 117} 118 119uint32_t TextDropShadowCache::getMaxSize() { 120 return mMaxSize; 121} 122 123/////////////////////////////////////////////////////////////////////////////// 124// Callbacks 125/////////////////////////////////////////////////////////////////////////////// 126 127void TextDropShadowCache::operator()(ShadowText&, ShadowTexture*& texture) { 128 if (texture) { 129 mSize -= texture->objectSize(); 130 131 if (mDebugEnabled) { 132 ALOGD("Shadow texture deleted, size = %d", texture->bitmapSize); 133 } 134 135 texture->deleteTexture(); 136 delete texture; 137 } 138} 139 140/////////////////////////////////////////////////////////////////////////////// 141// Caching 142/////////////////////////////////////////////////////////////////////////////// 143 144void TextDropShadowCache::clear() { 145 mCache.clear(); 146} 147 148ShadowTexture* TextDropShadowCache::get(const SkPaint* paint, const char* glyphs, int numGlyphs, 149 float radius, const float* positions) { 150 ShadowText entry(paint, radius, numGlyphs, glyphs, positions); 151 ShadowTexture* texture = mCache.get(entry); 152 153 if (!texture) { 154 SkPaint paintCopy(*paint); 155 paintCopy.setTextAlign(SkPaint::kLeft_Align); 156 FontRenderer::DropShadow shadow = mRenderer->renderDropShadow(&paintCopy, glyphs, numGlyphs, 157 radius, positions); 158 159 if (!shadow.image) { 160 return nullptr; 161 } 162 163 Caches& caches = Caches::getInstance(); 164 165 texture = new ShadowTexture(caches); 166 texture->left = shadow.penX; 167 texture->top = shadow.penY; 168 texture->generation = 0; 169 texture->blend = true; 170 171 const uint32_t size = shadow.width * shadow.height; 172 173 // Don't even try to cache a bitmap that's bigger than the cache 174 if (size < mMaxSize) { 175 while (mSize + size > mMaxSize) { 176 LOG_ALWAYS_FATAL_IF(!mCache.removeOldest(), 177 "Failed to remove oldest from cache. mSize = %" 178 PRIu32 ", mCache.size() = %zu", mSize, mCache.size()); 179 } 180 } 181 182 // Textures are Alpha8 183 texture->upload(GL_ALPHA, shadow.width, shadow.height, 184 GL_ALPHA, GL_UNSIGNED_BYTE, shadow.image); 185 texture->setFilter(GL_LINEAR); 186 texture->setWrap(GL_CLAMP_TO_EDGE); 187 188 if (size < mMaxSize) { 189 if (mDebugEnabled) { 190 ALOGD("Shadow texture created, size = %d", texture->bitmapSize); 191 } 192 193 entry.copyTextLocally(); 194 195 mSize += texture->objectSize(); 196 mCache.put(entry, texture); 197 } else { 198 texture->cleanup = true; 199 } 200 201 // Cleanup shadow 202 free(shadow.image); 203 } 204 205 return texture; 206} 207 208}; // namespace uirenderer 209}; // namespace android 210