FontCollection.cpp revision bae347682989d2627081310129a5b60541ed6ad0
19cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien/* 29cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * Copyright (C) 2013 The Android Open Source Project 39cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * 49cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * Licensed under the Apache License, Version 2.0 (the "License"); 59cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * you may not use this file except in compliance with the License. 69cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * You may obtain a copy of the License at 79cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * 89cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * http://www.apache.org/licenses/LICENSE-2.0 99cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * 109cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * Unless required by applicable law or agreed to in writing, software 119cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * distributed under the License is distributed on an "AS IS" BASIS, 129cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * See the License for the specific language governing permissions and 149cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien * limitations under the License. 159cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien */ 169cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 17ecc2d34ac23a497988f21e5f415b53c007b9d8c5Raph Levien// #define VERBOSE_DEBUG 18ecc2d34ac23a497988f21e5f415b53c007b9d8c5Raph Levien 19ecc2d34ac23a497988f21e5f415b53c007b9d8c5Raph Levien#define LOG_TAG "Minikin" 20ecc2d34ac23a497988f21e5f415b53c007b9d8c5Raph Levien#include <cutils/log.h> 219cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 22997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien#include "unicode/unistr.h" 23997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien#include "unicode/unorm2.h" 24997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien 25c31e3883456e018d742e9f29815ba5ff8b315ea1Raph Levien#include "MinikinInternal.h" 269cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#include <minikin/FontCollection.h> 279cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 289cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levienusing std::vector; 299cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 309cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Leviennamespace android { 319cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 329cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levientemplate <typename T> 339cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levienstatic inline T max(T a, T b) { 349cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien return a>b ? a : b; 359cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} 369cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 374d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levienuint32_t FontCollection::sNextId = 0; 384d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien 399cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph LevienFontCollection::FontCollection(const vector<FontFamily*>& typefaces) : 409cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien mMaxChar(0) { 41c31e3883456e018d742e9f29815ba5ff8b315ea1Raph Levien AutoMutex _l(gMinikinLock); 424d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien mId = sNextId++; 439cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien vector<uint32_t> lastChar; 449cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien size_t nTypefaces = typefaces.size(); 459cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#ifdef VERBOSE_DEBUG 46bae347682989d2627081310129a5b60541ed6ad0Seigo Nonaka ALOGD("nTypefaces = %zd\n", nTypefaces); 479cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#endif 489cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien const FontStyle defaultStyle; 499cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien for (size_t i = 0; i < nTypefaces; i++) { 509cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien FontFamily* family = typefaces[i]; 519a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien MinikinFont* typeface = family->getClosestMatch(defaultStyle).font; 524d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien if (typeface == NULL) { 534d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien continue; 544d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien } 55bd36ec766a451c62ffdd407d5ce1a355e8f7dfd8Raph Levien family->RefLocked(); 5613f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien const SparseBitSet* coverage = family->getCoverage(); 57cb20a2f0b366bfc16db3a489a60156dec7a9fe21Andreas Gampe if (coverage == nullptr) { 58cb20a2f0b366bfc16db3a489a60156dec7a9fe21Andreas Gampe family->UnrefLocked(); 59cb20a2f0b366bfc16db3a489a60156dec7a9fe21Andreas Gampe continue; 60cb20a2f0b366bfc16db3a489a60156dec7a9fe21Andreas Gampe } 61cb20a2f0b366bfc16db3a489a60156dec7a9fe21Andreas Gampe mFamilies.push_back(family); // emplace_back would be better 6213f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien mMaxChar = max(mMaxChar, coverage->length()); 6313f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien lastChar.push_back(coverage->nextSetBit(0)); 649cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 6513f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien nTypefaces = mFamilies.size(); 66156acb18f53b32655abb34166ea737e4320ca366Raph Levien LOG_ALWAYS_FATAL_IF(nTypefaces == 0, 67156acb18f53b32655abb34166ea737e4320ca366Raph Levien "Font collection must have at least one valid typeface"); 6872fe9422c869b7878240a23e4650d9d90edb1c2aRaph Levien size_t nPages = (mMaxChar + kPageMask) >> kLogCharsPerPage; 699cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien size_t offset = 0; 709cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien for (size_t i = 0; i < nPages; i++) { 719cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien Range dummy; 729cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien mRanges.push_back(dummy); 739cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien Range* range = &mRanges.back(); 749cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#ifdef VERBOSE_DEBUG 75bae347682989d2627081310129a5b60541ed6ad0Seigo Nonaka ALOGD("i=%zd: range start = %zd\n", i, offset); 769cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#endif 779cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien range->start = offset; 789cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien for (size_t j = 0; j < nTypefaces; j++) { 799cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien if (lastChar[j] < (i + 1) << kLogCharsPerPage) { 8013f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien FontFamily* family = mFamilies[j]; 8113f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien mFamilyVec.push_back(family); 829cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien offset++; 8313f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien uint32_t nextChar = family->getCoverage()->nextSetBit((i + 1) << kLogCharsPerPage); 849cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#ifdef VERBOSE_DEBUG 85bae347682989d2627081310129a5b60541ed6ad0Seigo Nonaka ALOGD("nextChar = %d (j = %zd)\n", nextChar, j); 869cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#endif 879cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien lastChar[j] = nextChar; 889cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 899cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 909cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien range->end = offset; 919cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 929cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} 939cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 949cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph LevienFontCollection::~FontCollection() { 9513f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien for (size_t i = 0; i < mFamilies.size(); i++) { 9613f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien mFamilies[i]->UnrefLocked(); 979cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 989cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} 999cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 1007b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// Implement heuristic for choosing best-match font. Here are the rules: 1017b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// 1. If first font in the collection has the character, it wins. 1027b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// 2. If a font matches both language and script, it gets a score of 4. 1037b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// 3. If a font matches just language, it gets a score of 2. 1047b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// 4. Matching the "compact" or "elegant" variant adds one to the score. 1057b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien// 5. Highest score wins, with ties resolved to the first font. 106bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo NonakaFontFamily* FontCollection::getFamilyForChar(uint32_t ch, uint32_t vs, 107066e8575af64fb452617ac6005de6ccf6509553bRaph Levien FontLanguage lang, int variant) const { 1089cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien if (ch >= mMaxChar) { 1099cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien return NULL; 1109cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 1119cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien const Range& range = mRanges[ch >> kLogCharsPerPage]; 1129cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#ifdef VERBOSE_DEBUG 113bae347682989d2627081310129a5b60541ed6ad0Seigo Nonaka ALOGD("querying range %zd:%zd\n", range.start, range.end); 1149cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien#endif 115bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka FontFamily* bestFamily = nullptr; 1167b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien int bestScore = -1; 1179cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien for (size_t i = range.start; i < range.end; i++) { 11813f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien FontFamily* family = mFamilyVec[i]; 119bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (vs == 0 ? family->getCoverage()->get(ch) : family->hasVariationSelector(ch, vs)) { 1207b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien // First font family in collection always matches 12113f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien if (mFamilies[0] == family) { 12213f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien return family; 1237b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien } 1247b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien int score = lang.match(family->lang()) * 2; 12590a09c3f36d98530822392446884b8af68035908Raph Levien if (family->variant() == 0 || family->variant() == variant) { 1267b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien score++; 1277b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien } 1287b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien if (score > bestScore) { 1297b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien bestScore = score; 13013f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien bestFamily = family; 1317b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien } 1329cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 1339cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 134bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (bestFamily == nullptr && vs != 0) { 135bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka // If no fonts support the codepoint and variation selector pair, 136bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka // fallback to select a font family that supports just the base 137bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka // character, ignoring the variation selector. 138bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka return getFamilyForChar(ch, 0, lang, variant); 139bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } 140bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (bestFamily == nullptr && !mFamilyVec.empty()) { 141997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien UErrorCode errorCode = U_ZERO_ERROR; 142997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien const UNormalizer2* normalizer = unorm2_getNFDInstance(&errorCode); 143997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien if (U_SUCCESS(errorCode)) { 144997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien UChar decomposed[4]; 145997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien int len = unorm2_getRawDecomposition(normalizer, ch, decomposed, 4, &errorCode); 146997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien if (U_SUCCESS(errorCode) && len > 0) { 147997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien int off = 0; 148997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien U16_NEXT_UNSAFE(decomposed, off, ch); 149bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka return getFamilyForChar(ch, vs, lang, variant); 150997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien } 151997c799e3ec6bf8adf687e29670d23d91e0f5feeRaph Levien } 15213f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien bestFamily = mFamilies[0]; 153156acb18f53b32655abb34166ea737e4320ca366Raph Levien } 15413f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien return bestFamily; 1559cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} 1569cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 157bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levienconst uint32_t NBSP = 0xa0; 158bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levienconst uint32_t ZWJ = 0x200c; 159bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levienconst uint32_t ZWNJ = 0x200d; 160f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbodconst uint32_t KEYCAP = 0x20e3; 16190a09c3f36d98530822392446884b8af68035908Raph Levienconst uint32_t HYPHEN = 0x2010; 16290a09c3f36d98530822392446884b8af68035908Raph Levienconst uint32_t NB_HYPHEN = 0x2011; 163f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod 164bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien// Characters where we want to continue using existing font run instead of 165bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien// recomputing the best match in the fallback list. 16690a09c3f36d98530822392446884b8af68035908Raph Levienstatic const uint32_t stickyWhitelist[] = { '!', ',', '-', '.', ':', ';', '?', NBSP, ZWJ, ZWNJ, 16790a09c3f36d98530822392446884b8af68035908Raph Levien KEYCAP, HYPHEN, NB_HYPHEN }; 168bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien 169bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levienstatic bool isStickyWhitelisted(uint32_t c) { 170bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien for (size_t i = 0; i < sizeof(stickyWhitelist) / sizeof(stickyWhitelist[0]); i++) { 171bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien if (stickyWhitelist[i] == c) return true; 172bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien } 173bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien return false; 174bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien} 175bb601b67dd05947f92cc23092bfb8a059c2e3377Raph Levien 176bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonakastatic bool isVariationSelector(uint32_t c) { 177bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka return (0xFE00 <= c && c <= 0xFE0F) || (0xE0100 <= c && c <= 0xE01EF); 178bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka} 179bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 1809cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levienvoid FontCollection::itemize(const uint16_t *string, size_t string_size, FontStyle style, 1819cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien vector<Run>* result) const { 1827b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien FontLanguage lang = style.getLanguage(); 1837b221d97b7b64dc5ce457e19666d55d042e22e62Raph Levien int variant = style.getVariant(); 18413f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien FontFamily* lastFamily = NULL; 1859cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien Run* run = NULL; 186bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 187bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (string_size == 0) { 188bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka return; 189bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } 190bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 191bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka const uint32_t kEndOfString = 0xFFFFFFFF; 192bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 193bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka uint32_t nextCh = 0; 194bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka uint32_t prevCh = 0; 195bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka size_t nextUtf16Pos = 0; 196bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka size_t readLength = 0; 197bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka U16_NEXT(string, readLength, string_size, nextCh); 198bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 199bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka do { 200bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka const uint32_t ch = nextCh; 201bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka const size_t utf16Pos = nextUtf16Pos; 202bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka nextUtf16Pos = readLength; 203bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (readLength < string_size) { 204bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka U16_NEXT(string, readLength, string_size, nextCh); 205bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } else { 206bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka nextCh = kEndOfString; 207bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } 208bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 209bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka bool shouldContinueRun = false; 210bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (lastFamily != nullptr) { 211bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (isStickyWhitelisted(ch)) { 212bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka // Continue using existing font as long as it has coverage and is whitelisted 213bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka shouldContinueRun = lastFamily->getCoverage()->get(ch); 214bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } else if (isVariationSelector(ch)) { 215bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka // Always continue if the character is a variation selector. 216bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka shouldContinueRun = true; 2179cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 2189cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 219bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka 220bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (!shouldContinueRun) { 221bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka FontFamily* family = 222bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka getFamilyForChar(ch, isVariationSelector(nextCh) ? nextCh : 0, lang, variant); 223bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (utf16Pos == 0 || family != lastFamily) { 224bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka size_t start = utf16Pos; 225f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod // Workaround for Emoji keycap until we implement per-cluster font 226f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod // selection: if keycap is found in a different font that also 227f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod // supports previous char, attach previous char to the new run. 228f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod // Only handles non-surrogate characters. 229f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod // Bug 7557244. 230bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka if (ch == KEYCAP && utf16Pos != 0 && family && family->getCoverage()->get(prevCh)) { 231f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod run->end--; 232f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod if (run->start == run->end) { 233f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod result->pop_back(); 234f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod } 235f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod start--; 236f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod } 237066e8575af64fb452617ac6005de6ccf6509553bRaph Levien Run dummy; 238066e8575af64fb452617ac6005de6ccf6509553bRaph Levien result->push_back(dummy); 239066e8575af64fb452617ac6005de6ccf6509553bRaph Levien run = &result->back(); 24013f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien if (family == NULL) { 2419a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien run->fakedFont.font = NULL; 242066e8575af64fb452617ac6005de6ccf6509553bRaph Levien } else { 24313f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien run->fakedFont = family->getClosestMatch(style); 244066e8575af64fb452617ac6005de6ccf6509553bRaph Levien } 24513f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien lastFamily = family; 246f952161b874fd2e9af474b9fd2ebcca1f3bb4555Behdad Esfahbod run->start = start; 2479cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 2489cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien } 249bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka prevCh = ch; 250bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka run->end = nextUtf16Pos; // exclusive 251bbdd73ec077a1bb6801b25a639834be16dfd78cbSeigo Nonaka } while (nextCh != kEndOfString); 2529cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} 2539cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien 25489566f0ada1cafe673efa064cde38467990235d4Raph LevienMinikinFont* FontCollection::baseFont(FontStyle style) { 2559a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien return baseFontFaked(style).font; 2569a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien} 2579a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien 2589a5f713add8cfb91ac2c9ed5c917309053201ab6Raph LevienFakedFont FontCollection::baseFontFaked(FontStyle style) { 25913f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien if (mFamilies.empty()) { 2609a5f713add8cfb91ac2c9ed5c917309053201ab6Raph Levien return FakedFont(); 26189566f0ada1cafe673efa064cde38467990235d4Raph Levien } 26213f1aae02bacd475722bc8ea3fc2cf6abc1a82e3Raph Levien return mFamilies[0]->getClosestMatch(style); 26389566f0ada1cafe673efa064cde38467990235d4Raph Levien} 26489566f0ada1cafe673efa064cde38467990235d4Raph Levien 2654d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levienuint32_t FontCollection::getId() const { 2664d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien return mId; 2674d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien} 2684d4e6bc8118d15542f1f2a9218f0f7a91a29474fRaph Levien 2690f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonakavoid FontCollection::purgeFontFamilyHbFontCache() const { 2700f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka assertMinikinLocked(); 2710f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka for (size_t i = 0; i < mFamilies.size(); ++i) { 2720f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka mFamilies[i]->purgeHbFontCache(); 2730f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka } 2740f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka} 2750f2a025d135f9ca52cc3cf917fffc29d6c126094Seigo Nonaka 2769cc9bbe1461f359f0b27c5e7645c17dda001ab1dRaph Levien} // namespace android 277