1 /* 2 * Copyright (C) 2013 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 "Minikin" 18 19 #include <cutils/log.h> 20 #include <stdlib.h> 21 #include <stdint.h> 22 23 #include "MinikinInternal.h" 24 #include <minikin/MinikinFont.h> 25 #include <minikin/AnalyzeStyle.h> 26 #include <minikin/CmapCoverage.h> 27 #include <minikin/FontFamily.h> 28 #include <UniquePtr.h> 29 30 using std::vector; 31 32 namespace android { 33 34 // Parse bcp-47 language identifier into internal structure 35 FontLanguage::FontLanguage(const char* buf, size_t size) { 36 uint32_t bits = 0; 37 size_t i; 38 for (i = 0; i < size; i++) { 39 uint16_t c = buf[i]; 40 if (c == '-' || c == '_') break; 41 } 42 if (i == 2) { 43 bits = (uint8_t(buf[0]) << 8) | uint8_t(buf[1]); 44 } 45 size_t next; 46 for (i++; i < size; i = next + 1) { 47 for (next = i; next < size; next++) { 48 uint16_t c = buf[next]; 49 if (c == '-' || c == '_') break; 50 } 51 if (next - i == 4 && buf[i] == 'H' && buf[i+1] == 'a' && buf[i+2] == 'n') { 52 if (buf[i+3] == 's') { 53 bits |= kHansFlag; 54 } else if (buf[i+3] == 't') { 55 bits |= kHantFlag; 56 } 57 } 58 // TODO: this might be a good place to infer script from country (zh_TW -> Hant), 59 // but perhaps it's up to the client to do that, before passing a string. 60 } 61 mBits = bits; 62 } 63 64 std::string FontLanguage::getString() const { 65 char buf[16]; 66 size_t i = 0; 67 if (mBits & kBaseLangMask) { 68 buf[i++] = (mBits >> 8) & 0xFFu; 69 buf[i++] = mBits & 0xFFu; 70 } 71 if (mBits & kScriptMask) { 72 if (!i) 73 buf[i++] = 'x'; 74 buf[i++] = '-'; 75 buf[i++] = 'H'; 76 buf[i++] = 'a'; 77 buf[i++] = 'n'; 78 if (mBits & kHansFlag) 79 buf[i++] = 's'; 80 else 81 buf[i++] = 't'; 82 } 83 return std::string(buf, i); 84 } 85 86 int FontLanguage::match(const FontLanguage other) const { 87 int result = 0; 88 if ((mBits & kBaseLangMask) == (other.mBits & kBaseLangMask)) { 89 result++; 90 if ((mBits & kScriptMask) != 0 && (mBits & kScriptMask) == (other.mBits & kScriptMask)) { 91 result++; 92 } 93 } 94 return result; 95 } 96 97 FontFamily::~FontFamily() { 98 for (size_t i = 0; i < mFonts.size(); i++) { 99 mFonts[i].typeface->UnrefLocked(); 100 } 101 } 102 103 bool FontFamily::addFont(MinikinFont* typeface) { 104 AutoMutex _l(gMinikinLock); 105 const uint32_t os2Tag = MinikinFont::MakeTag('O', 'S', '/', '2'); 106 size_t os2Size = 0; 107 bool ok = typeface->GetTable(os2Tag, NULL, &os2Size); 108 if (!ok) return false; 109 UniquePtr<uint8_t[]> os2Data(new uint8_t[os2Size]); 110 ok = typeface->GetTable(os2Tag, os2Data.get(), &os2Size); 111 if (!ok) return false; 112 int weight; 113 bool italic; 114 if (analyzeStyle(os2Data.get(), os2Size, &weight, &italic)) { 115 //ALOGD("analyzed weight = %d, italic = %s", weight, italic ? "true" : "false"); 116 FontStyle style(weight, italic); 117 addFontLocked(typeface, style); 118 return true; 119 } else { 120 ALOGD("failed to analyze style"); 121 } 122 return false; 123 } 124 125 void FontFamily::addFont(MinikinFont* typeface, FontStyle style) { 126 AutoMutex _l(gMinikinLock); 127 addFontLocked(typeface, style); 128 } 129 130 void FontFamily::addFontLocked(MinikinFont* typeface, FontStyle style) { typeface->RefLocked(); 131 mFonts.push_back(Font(typeface, style)); 132 mCoverageValid = false; 133 } 134 135 // Compute a matching metric between two styles - 0 is an exact match 136 static int computeMatch(FontStyle style1, FontStyle style2) { 137 if (style1 == style2) return 0; 138 int score = abs(style1.getWeight() - style2.getWeight()); 139 if (style1.getItalic() != style2.getItalic()) { 140 score += 2; 141 } 142 return score; 143 } 144 145 static FontFakery computeFakery(FontStyle wanted, FontStyle actual) { 146 // If desired weight is semibold or darker, and 2 or more grades 147 // higher than actual (for example, medium 500 -> bold 700), then 148 // select fake bold. 149 int wantedWeight = wanted.getWeight(); 150 bool isFakeBold = wantedWeight >= 6 && (wantedWeight - actual.getWeight()) >= 2; 151 bool isFakeItalic = wanted.getItalic() && !actual.getItalic(); 152 return FontFakery(isFakeBold, isFakeItalic); 153 } 154 155 FakedFont FontFamily::getClosestMatch(FontStyle style) const { 156 const Font* bestFont = NULL; 157 int bestMatch = 0; 158 for (size_t i = 0; i < mFonts.size(); i++) { 159 const Font& font = mFonts[i]; 160 int match = computeMatch(font.style, style); 161 if (i == 0 || match < bestMatch) { 162 bestFont = &font; 163 bestMatch = match; 164 } 165 } 166 FakedFont result; 167 if (bestFont == NULL) { 168 result.font = NULL; 169 } else { 170 result.font = bestFont->typeface; 171 result.fakery = computeFakery(style, bestFont->style); 172 } 173 return result; 174 } 175 176 size_t FontFamily::getNumFonts() const { 177 return mFonts.size(); 178 } 179 180 MinikinFont* FontFamily::getFont(size_t index) const { 181 return mFonts[index].typeface; 182 } 183 184 FontStyle FontFamily::getStyle(size_t index) const { 185 return mFonts[index].style; 186 } 187 188 const SparseBitSet* FontFamily::getCoverage() { 189 if (!mCoverageValid) { 190 const FontStyle defaultStyle; 191 MinikinFont* typeface = getClosestMatch(defaultStyle).font; 192 const uint32_t cmapTag = MinikinFont::MakeTag('c', 'm', 'a', 'p'); 193 size_t cmapSize = 0; 194 if (!typeface->GetTable(cmapTag, NULL, &cmapSize)) { 195 ALOGE("Could not get cmap table size!\n"); 196 // Note: This means we will retry on the next call to getCoverage, as we can't store 197 // the failure. This is fine, as we assume this doesn't really happen in practice. 198 return nullptr; 199 } 200 UniquePtr<uint8_t[]> cmapData(new uint8_t[cmapSize]); 201 if (!typeface->GetTable(cmapTag, cmapData.get(), &cmapSize)) { 202 ALOGE("Unexpected failure to read cmap table!\n"); 203 return nullptr; 204 } 205 CmapCoverage::getCoverage(mCoverage, cmapData.get(), cmapSize); // TODO: Error check? 206 #ifdef VERBOSE_DEBUG 207 ALOGD("font coverage length=%d, first ch=%x\n", mCoverage->length(), 208 mCoverage->nextSetBit(0)); 209 #endif 210 mCoverageValid = true; 211 } 212 return &mCoverage; 213 } 214 215 } // namespace android 216