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994aa84f7b
Minikin has a special font fallback for VS15/VS16, so hasVariationSelector for emojis with VS15/VS16 should always return true. Bug: 27531970 Change-Id: Ieebd58f48b135b6ec50d999df68dcc09b1284606
475 lines
20 KiB
C++
475 lines
20 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// #define VERBOSE_DEBUG
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#define LOG_TAG "Minikin"
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#include <cutils/log.h>
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#include <algorithm>
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#include "unicode/unistr.h"
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#include "unicode/unorm2.h"
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#include "FontLanguage.h"
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#include "FontLanguageListCache.h"
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#include "MinikinInternal.h"
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#include <minikin/FontCollection.h>
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using std::vector;
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namespace android {
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template <typename T>
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static inline T max(T a, T b) {
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return a>b ? a : b;
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}
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const uint32_t EMOJI_STYLE_VS = 0xFE0F;
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const uint32_t TEXT_STYLE_VS = 0xFE0E;
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// See http://www.unicode.org/Public/9.0.0/ucd/StandardizedVariants-9.0.0d1.txt
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// Must be sorted.
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const uint32_t EMOJI_STYLE_VS_BASES[] = {
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0x0023, 0x002A, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039,
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0x00A9, 0x00AE, 0x203C, 0x2049, 0x2122, 0x2139, 0x2194, 0x2195, 0x2196, 0x2197, 0x2198, 0x2199,
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0x21A9, 0x21AA, 0x231A, 0x231B, 0x2328, 0x23CF, 0x23ED, 0x23EE, 0x23EF, 0x23F1, 0x23F2, 0x23F8,
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0x23F9, 0x23FA, 0x24C2, 0x25AA, 0x25AB, 0x25B6, 0x25C0, 0x25FB, 0x25FC, 0x25FD, 0x25FE, 0x2600,
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0x2601, 0x2602, 0x2603, 0x2604, 0x260E, 0x2611, 0x2614, 0x2615, 0x2618, 0x261D, 0x2620, 0x2622,
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0x2623, 0x2626, 0x262A, 0x262E, 0x262F, 0x2638, 0x2639, 0x263A, 0x2648, 0x2649, 0x264A, 0x264B,
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0x264C, 0x264D, 0x264E, 0x264F, 0x2650, 0x2651, 0x2652, 0x2653, 0x2660, 0x2663, 0x2665, 0x2666,
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0x2668, 0x267B, 0x267F, 0x2692, 0x2693, 0x2694, 0x2696, 0x2697, 0x2699, 0x269B, 0x269C, 0x26A0,
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0x26A1, 0x26AA, 0x26AB, 0x26B0, 0x26B1, 0x26BD, 0x26BE, 0x26C4, 0x26C5, 0x26C8, 0x26CF, 0x26D1,
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0x26D3, 0x26D4, 0x26E9, 0x26EA, 0x26F0, 0x26F1, 0x26F2, 0x26F3, 0x26F4, 0x26F5, 0x26F7, 0x26F8,
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0x26F9, 0x26FA, 0x26FD, 0x2702, 0x2708, 0x2709, 0x270C, 0x270D, 0x270F, 0x2712, 0x2714, 0x2716,
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0x271D, 0x2721, 0x2733, 0x2734, 0x2744, 0x2747, 0x2757, 0x2763, 0x2764, 0x27A1, 0x2934, 0x2935,
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0x2B05, 0x2B06, 0x2B07, 0x2B1B, 0x2B1C, 0x2B50, 0x2B55, 0x3030, 0x303D, 0x3297, 0x3299,
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0x1F004, 0x1F170, 0x1F171, 0x1F17E, 0x1F17F, 0x1F202, 0x1F21A, 0x1F22F, 0x1F237, 0x1F321,
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0x1F324, 0x1F325, 0x1F326, 0x1F327, 0x1F328, 0x1F329, 0x1F32A, 0x1F32B, 0x1F32C, 0x1F336,
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0x1F37D, 0x1F396, 0x1F397, 0x1F399, 0x1F39A, 0x1F39B, 0x1F39E, 0x1F39F, 0x1F3CB, 0x1F3CC,
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0x1F3CD, 0x1F3CE, 0x1F3D4, 0x1F3D5, 0x1F3D6, 0x1F3D7, 0x1F3D8, 0x1F3D9, 0x1F3DA, 0x1F3DB,
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0x1F3DC, 0x1F3DD, 0x1F3DE, 0x1F3DF, 0x1F3F3, 0x1F3F5, 0x1F3F7, 0x1F43F, 0x1F441, 0x1F4FD,
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0x1F549, 0x1F54A, 0x1F56F, 0x1F570, 0x1F573, 0x1F574, 0x1F575, 0x1F576, 0x1F577, 0x1F578,
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0x1F579, 0x1F587, 0x1F58A, 0x1F58B, 0x1F58C, 0x1F58D, 0x1F590, 0x1F5A5, 0x1F5A8, 0x1F5B1,
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0x1F5B2, 0x1F5BC, 0x1F5C2, 0x1F5C3, 0x1F5C4, 0x1F5D1, 0x1F5D2, 0x1F5D3, 0x1F5DC, 0x1F5DD,
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0x1F5DE, 0x1F5E1, 0x1F5E3, 0x1F5E8, 0x1F5EF, 0x1F5F3, 0x1F5FA, 0x1F6CB, 0x1F6CD, 0x1F6CE,
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0x1F6CF, 0x1F6E0, 0x1F6E1, 0x1F6E2, 0x1F6E3, 0x1F6E4, 0x1F6E5, 0x1F6E9, 0x1F6F0, 0x1F6F3,
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};
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static bool isEmojiStyleVSBase(uint32_t cp) {
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const size_t length = sizeof(EMOJI_STYLE_VS_BASES) / sizeof(EMOJI_STYLE_VS_BASES[0]);
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return std::binary_search(EMOJI_STYLE_VS_BASES, EMOJI_STYLE_VS_BASES + length, cp);
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}
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uint32_t FontCollection::sNextId = 0;
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FontCollection::FontCollection(const vector<FontFamily*>& typefaces) :
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mMaxChar(0) {
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AutoMutex _l(gMinikinLock);
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mId = sNextId++;
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vector<uint32_t> lastChar;
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size_t nTypefaces = typefaces.size();
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#ifdef VERBOSE_DEBUG
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ALOGD("nTypefaces = %zd\n", nTypefaces);
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#endif
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const FontStyle defaultStyle;
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for (size_t i = 0; i < nTypefaces; i++) {
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FontFamily* family = typefaces[i];
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MinikinFont* typeface = family->getClosestMatch(defaultStyle).font;
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if (typeface == NULL) {
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continue;
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}
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family->RefLocked();
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const SparseBitSet* coverage = family->getCoverage();
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if (coverage == nullptr) {
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family->UnrefLocked();
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continue;
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}
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mFamilies.push_back(family); // emplace_back would be better
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if (family->hasVSTable()) {
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mVSFamilyVec.push_back(family);
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}
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mMaxChar = max(mMaxChar, coverage->length());
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lastChar.push_back(coverage->nextSetBit(0));
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}
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nTypefaces = mFamilies.size();
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LOG_ALWAYS_FATAL_IF(nTypefaces == 0,
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"Font collection must have at least one valid typeface");
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size_t nPages = (mMaxChar + kPageMask) >> kLogCharsPerPage;
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size_t offset = 0;
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// TODO: Use variation selector map for mRanges construction.
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// A font can have a glyph for a base code point and variation selector pair but no glyph for
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// the base code point without variation selector. The family won't be listed in the range in
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// this case.
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for (size_t i = 0; i < nPages; i++) {
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Range dummy;
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mRanges.push_back(dummy);
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Range* range = &mRanges.back();
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#ifdef VERBOSE_DEBUG
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ALOGD("i=%zd: range start = %zd\n", i, offset);
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#endif
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range->start = offset;
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for (size_t j = 0; j < nTypefaces; j++) {
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if (lastChar[j] < (i + 1) << kLogCharsPerPage) {
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FontFamily* family = mFamilies[j];
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mFamilyVec.push_back(family);
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offset++;
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uint32_t nextChar = family->getCoverage()->nextSetBit((i + 1) << kLogCharsPerPage);
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#ifdef VERBOSE_DEBUG
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ALOGD("nextChar = %d (j = %zd)\n", nextChar, j);
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#endif
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lastChar[j] = nextChar;
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}
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}
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range->end = offset;
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}
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}
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FontCollection::~FontCollection() {
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for (size_t i = 0; i < mFamilies.size(); i++) {
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mFamilies[i]->UnrefLocked();
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}
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}
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// Special scores for the font fallback.
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const uint32_t kUnsupportedFontScore = 0;
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const uint32_t kFirstFontScore = UINT32_MAX;
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// Calculates a font score.
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// The score of the font family is based on three subscores.
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// - Coverage Score: How well the font family covers the given character or variation sequence.
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// - Language Score: How well the font family is appropriate for the language.
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// - Variant Score: Whether the font family matches the variant. Note that this variant is not the
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// one in BCP47. This is our own font variant (e.g., elegant, compact).
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//
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// Then, there is a priority for these three subscores as follow:
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// Coverage Score > Language Score > Variant Score
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// The returned score reflects this priority order.
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//
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// Note that there are two special scores.
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// - kUnsupportedFontScore: When the font family doesn't support the variation sequence or even its
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// base character.
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// - kFirstFontScore: When the font is the first font family in the collection and it supports the
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// given character or variation sequence.
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uint32_t FontCollection::calcFamilyScore(uint32_t ch, uint32_t vs, int variant, uint32_t langListId,
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FontFamily* fontFamily) const {
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const uint32_t coverageScore = calcCoverageScore(ch, vs, fontFamily);
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if (coverageScore == kFirstFontScore || coverageScore == kUnsupportedFontScore) {
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// No need to calculate other scores.
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return coverageScore;
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}
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const uint32_t languageScore = calcLanguageMatchingScore(langListId, *fontFamily);
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const uint32_t variantScore = calcVariantMatchingScore(variant, *fontFamily);
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// Subscores are encoded into 31 bits representation to meet the subscore priority.
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// The highest 2 bits are for coverage score, then following 28 bits are for language score,
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// then the last 1 bit is for variant score.
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return coverageScore << 29 | languageScore << 1 | variantScore;
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}
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// Calculates a font score based on variation sequence coverage.
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// - Returns kUnsupportedFontScore if the font doesn't support the variation sequence or its base
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// character.
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// - Returns kFirstFontScore if the font family is the first font family in the collection and it
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// supports the given character or variation sequence.
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// - Returns 3 if the font family supports the variation sequence.
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// - Returns 2 if the vs is a color variation selector (U+FE0F) and if the font is an emoji font.
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// - Returns 2 if the vs is a text variation selector (U+FE0E) and if the font is not an emoji font.
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// - Returns 1 if the variation selector is not specified or if the font family only supports the
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// variation sequence's base character.
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uint32_t FontCollection::calcCoverageScore(uint32_t ch, uint32_t vs, FontFamily* fontFamily) const {
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const bool hasVSGlyph = (vs != 0) && fontFamily->hasGlyph(ch, vs);
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if (!hasVSGlyph && !fontFamily->getCoverage()->get(ch)) {
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// The font doesn't support either variation sequence or even the base character.
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return kUnsupportedFontScore;
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}
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if ((vs == 0 || hasVSGlyph) && mFamilies[0] == fontFamily) {
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// If the first font family supports the given character or variation sequence, always use
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// it.
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return kFirstFontScore;
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}
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if (vs == 0) {
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return 1;
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}
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if (hasVSGlyph) {
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return 3;
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}
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if (vs == EMOJI_STYLE_VS || vs == TEXT_STYLE_VS) {
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const FontLanguages& langs = FontLanguageListCache::getById(fontFamily->langId());
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bool hasEmojiFlag = false;
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for (size_t i = 0; i < langs.size(); ++i) {
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if (langs[i].hasEmojiFlag()) {
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hasEmojiFlag = true;
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break;
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}
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}
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if (vs == EMOJI_STYLE_VS) {
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return hasEmojiFlag ? 2 : 1;
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} else { // vs == TEXT_STYLE_VS
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return hasEmojiFlag ? 1 : 2;
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}
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}
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return 1;
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}
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// Calculates font scores based on the script matching and primary langauge matching.
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//
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// If the font's script doesn't support the requested script, the font gets a score of 0. If the
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// font's script supports the requested script and the font has the same primary language as the
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// requested one, the font gets a score of 2. If the font's script supports the requested script
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// but the primary language is different from the requested one, the font gets a score of 1.
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//
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// If two languages in the requested list have the same language score, the font matching with
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// higher priority language gets a higher score. For example, in the case the user requested
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// language list is "ja-Jpan,en-Latn". The score of for the font of "ja-Jpan" gets a higher score
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// than the font of "en-Latn".
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//
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// To achieve the above two conditions, the language score is determined as follows:
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// LanguageScore = s(0) * 3^(m - 1) + s(1) * 3^(m - 2) + ... + s(m - 2) * 3 + s(m - 1)
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// Here, m is the maximum number of languages to be compared, and s(i) is the i-th language's
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// matching score. The possible values of s(i) are 0, 1 and 2.
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uint32_t FontCollection::calcLanguageMatchingScore(
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uint32_t userLangListId, const FontFamily& fontFamily) {
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const FontLanguages& langList = FontLanguageListCache::getById(userLangListId);
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const FontLanguages& fontLanguages = FontLanguageListCache::getById(fontFamily.langId());
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const size_t maxCompareNum = std::min(langList.size(), FONT_LANGUAGES_LIMIT);
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uint32_t score = 0;
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for (size_t i = 0; i < maxCompareNum; ++i) {
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score = score * 3u + langList[i].calcScoreFor(fontLanguages);
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}
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return score;
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}
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// Calculates a font score based on variant ("compact" or "elegant") matching.
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// - Returns 1 if the font doesn't have variant or the variant matches with the text style.
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// - No score if the font has a variant but it doesn't match with the text style.
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uint32_t FontCollection::calcVariantMatchingScore(int variant, const FontFamily& fontFamily) {
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return (fontFamily.variant() == 0 || fontFamily.variant() == variant) ? 1 : 0;
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}
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// Implement heuristic for choosing best-match font. Here are the rules:
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// 1. If first font in the collection has the character, it wins.
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// 2. Calculate a score for the font family. See comments in calcFamilyScore for the detail.
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// 3. Highest score wins, with ties resolved to the first font.
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// This method never returns nullptr.
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FontFamily* FontCollection::getFamilyForChar(uint32_t ch, uint32_t vs,
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uint32_t langListId, int variant) const {
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if (ch >= mMaxChar) {
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return mFamilies[0];
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}
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const std::vector<FontFamily*>* familyVec = &mFamilyVec;
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Range range = mRanges[ch >> kLogCharsPerPage];
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std::vector<FontFamily*> familyVecForVS;
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if (vs != 0) {
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// If variation selector is specified, need to search for both the variation sequence and
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// its base codepoint. Compute the union vector of them.
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familyVecForVS = mVSFamilyVec;
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familyVecForVS.insert(familyVecForVS.end(),
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mFamilyVec.begin() + range.start, mFamilyVec.begin() + range.end);
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std::sort(familyVecForVS.begin(), familyVecForVS.end());
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auto last = std::unique(familyVecForVS.begin(), familyVecForVS.end());
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familyVecForVS.erase(last, familyVecForVS.end());
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familyVec = &familyVecForVS;
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range = { 0, familyVecForVS.size() };
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}
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#ifdef VERBOSE_DEBUG
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ALOGD("querying range %zd:%zd\n", range.start, range.end);
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#endif
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FontFamily* bestFamily = nullptr;
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uint32_t bestScore = kUnsupportedFontScore;
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for (size_t i = range.start; i < range.end; i++) {
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FontFamily* family = (*familyVec)[i];
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const uint32_t score = calcFamilyScore(ch, vs, variant, langListId, family);
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if (score == kFirstFontScore) {
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// If the first font family supports the given character or variation sequence, always
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// use it.
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return family;
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}
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if (score > bestScore) {
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bestScore = score;
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bestFamily = family;
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}
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}
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if (bestFamily == nullptr) {
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UErrorCode errorCode = U_ZERO_ERROR;
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const UNormalizer2* normalizer = unorm2_getNFDInstance(&errorCode);
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if (U_SUCCESS(errorCode)) {
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UChar decomposed[4];
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int len = unorm2_getRawDecomposition(normalizer, ch, decomposed, 4, &errorCode);
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if (U_SUCCESS(errorCode) && len > 0) {
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int off = 0;
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U16_NEXT_UNSAFE(decomposed, off, ch);
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return getFamilyForChar(ch, vs, langListId, variant);
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}
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}
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bestFamily = mFamilies[0];
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}
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return bestFamily;
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}
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const uint32_t NBSP = 0xa0;
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const uint32_t ZWJ = 0x200c;
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const uint32_t ZWNJ = 0x200d;
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const uint32_t HYPHEN = 0x2010;
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const uint32_t NB_HYPHEN = 0x2011;
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// Characters where we want to continue using existing font run instead of
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// recomputing the best match in the fallback list.
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static const uint32_t stickyWhitelist[] = { '!', ',', '-', '.', ':', ';', '?', NBSP, ZWJ, ZWNJ,
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HYPHEN, NB_HYPHEN };
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static bool isStickyWhitelisted(uint32_t c) {
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for (size_t i = 0; i < sizeof(stickyWhitelist) / sizeof(stickyWhitelist[0]); i++) {
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if (stickyWhitelist[i] == c) return true;
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}
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return false;
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}
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static bool isVariationSelector(uint32_t c) {
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return (0xFE00 <= c && c <= 0xFE0F) || (0xE0100 <= c && c <= 0xE01EF);
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}
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bool FontCollection::hasVariationSelector(uint32_t baseCodepoint,
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uint32_t variationSelector) const {
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if (!isVariationSelector(variationSelector)) {
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return false;
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}
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if (baseCodepoint >= mMaxChar) {
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return false;
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}
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AutoMutex _l(gMinikinLock);
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// Currently mRanges can not be used here since it isn't aware of the variation sequence.
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for (size_t i = 0; i < mVSFamilyVec.size(); i++) {
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if (mVSFamilyVec[i]->hasGlyph(baseCodepoint, variationSelector)) {
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return true;
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}
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}
|
|
|
|
// Even if there is no cmap format 14 subtable entry for the given sequence, should return true
|
|
// for emoji + U+FE0E case since we have special fallback rule for the sequence.
|
|
if (isEmojiStyleVSBase(baseCodepoint) && variationSelector == TEXT_STYLE_VS) {
|
|
for (size_t i = 0; i < mFamilies.size(); ++i) {
|
|
if (!mFamilies[i]->isColorEmojiFamily() && variationSelector == TEXT_STYLE_VS &&
|
|
mFamilies[i]->hasGlyph(baseCodepoint, 0)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void FontCollection::itemize(const uint16_t *string, size_t string_size, FontStyle style,
|
|
vector<Run>* result) const {
|
|
const uint32_t langListId = style.getLanguageListId();
|
|
int variant = style.getVariant();
|
|
FontFamily* lastFamily = NULL;
|
|
Run* run = NULL;
|
|
|
|
if (string_size == 0) {
|
|
return;
|
|
}
|
|
|
|
const uint32_t kEndOfString = 0xFFFFFFFF;
|
|
|
|
uint32_t nextCh = 0;
|
|
uint32_t prevCh = 0;
|
|
size_t nextUtf16Pos = 0;
|
|
size_t readLength = 0;
|
|
U16_NEXT(string, readLength, string_size, nextCh);
|
|
|
|
do {
|
|
const uint32_t ch = nextCh;
|
|
const size_t utf16Pos = nextUtf16Pos;
|
|
nextUtf16Pos = readLength;
|
|
if (readLength < string_size) {
|
|
U16_NEXT(string, readLength, string_size, nextCh);
|
|
} else {
|
|
nextCh = kEndOfString;
|
|
}
|
|
|
|
bool shouldContinueRun = false;
|
|
if (lastFamily != nullptr) {
|
|
if (isStickyWhitelisted(ch)) {
|
|
// Continue using existing font as long as it has coverage and is whitelisted
|
|
shouldContinueRun = lastFamily->getCoverage()->get(ch);
|
|
} else if (isVariationSelector(ch)) {
|
|
// Always continue if the character is a variation selector.
|
|
shouldContinueRun = true;
|
|
}
|
|
}
|
|
|
|
if (!shouldContinueRun) {
|
|
FontFamily* family = getFamilyForChar(ch, isVariationSelector(nextCh) ? nextCh : 0,
|
|
langListId, variant);
|
|
if (utf16Pos == 0 || family != lastFamily) {
|
|
size_t start = utf16Pos;
|
|
// Workaround for combining marks and emoji modifiers until we implement
|
|
// per-cluster font selection: if a combining mark or an emoji modifier is found in
|
|
// a different font that also supports the previous character, attach previous
|
|
// character to the new run. U+20E3 COMBINING ENCLOSING KEYCAP, used in emoji, is
|
|
// handled properly by this since it's a combining mark too.
|
|
if (utf16Pos != 0 &&
|
|
((U_GET_GC_MASK(ch) & U_GC_M_MASK) != 0 ||
|
|
(isEmojiModifier(ch) && isEmojiBase(prevCh))) &&
|
|
family && family->getCoverage()->get(prevCh)) {
|
|
const size_t prevChLength = U16_LENGTH(prevCh);
|
|
run->end -= prevChLength;
|
|
if (run->start == run->end) {
|
|
result->pop_back();
|
|
}
|
|
start -= prevChLength;
|
|
}
|
|
Run dummy;
|
|
result->push_back(dummy);
|
|
run = &result->back();
|
|
run->fakedFont = family->getClosestMatch(style);
|
|
lastFamily = family;
|
|
run->start = start;
|
|
}
|
|
}
|
|
prevCh = ch;
|
|
run->end = nextUtf16Pos; // exclusive
|
|
} while (nextCh != kEndOfString);
|
|
}
|
|
|
|
MinikinFont* FontCollection::baseFont(FontStyle style) {
|
|
return baseFontFaked(style).font;
|
|
}
|
|
|
|
FakedFont FontCollection::baseFontFaked(FontStyle style) {
|
|
return mFamilies[0]->getClosestMatch(style);
|
|
}
|
|
|
|
uint32_t FontCollection::getId() const {
|
|
return mId;
|
|
}
|
|
|
|
} // namespace android
|