| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "Minikin" |
| |
| #include "minikin/FontFamily.h" |
| |
| #include <algorithm> |
| #include <vector> |
| |
| #include <log/log.h> |
| |
| #include "minikin/CmapCoverage.h" |
| #include "minikin/FamilyVariant.h" |
| #include "minikin/HbUtils.h" |
| #include "minikin/MinikinFont.h" |
| |
| #include "FontUtils.h" |
| #include "Locale.h" |
| #include "LocaleListCache.h" |
| #include "MinikinInternal.h" |
| |
| namespace minikin { |
| |
| FontFamily::FontFamily(std::vector<std::shared_ptr<Font>>&& fonts) |
| : FontFamily(FamilyVariant::DEFAULT, std::move(fonts)) {} |
| |
| FontFamily::FontFamily(FamilyVariant variant, std::vector<std::shared_ptr<Font>>&& fonts) |
| : FontFamily(kEmptyLocaleListId, variant, std::move(fonts), false /* isCustomFallback */) {} |
| |
| FontFamily::FontFamily(uint32_t localeListId, FamilyVariant variant, |
| std::vector<std::shared_ptr<Font>>&& fonts, bool isCustomFallback) |
| : mLocaleListId(localeListId), |
| mVariant(variant), |
| mFonts(std::move(fonts)), |
| mIsColorEmoji(LocaleListCache::getById(localeListId).getEmojiStyle() == |
| EmojiStyle::EMOJI), |
| mIsCustomFallback(isCustomFallback) { |
| MINIKIN_ASSERT(!mFonts.empty(), "FontFamily must contain at least one font."); |
| computeCoverage(); |
| } |
| |
| FontFamily::FontFamily(uint32_t localeListId, FamilyVariant variant, |
| std::vector<std::shared_ptr<Font>>&& fonts, |
| std::unordered_set<AxisTag>&& supportedAxes, bool isColorEmoji, |
| bool isCustomFallback, SparseBitSet&& coverage, |
| std::vector<std::unique_ptr<SparseBitSet>>&& cmapFmt14Coverage) |
| : mLocaleListId(localeListId), |
| mVariant(variant), |
| mFonts(std::move(fonts)), |
| mSupportedAxes(std::move(supportedAxes)), |
| mIsColorEmoji(isColorEmoji), |
| mIsCustomFallback(isCustomFallback), |
| mCoverage(std::move(coverage)), |
| mCmapFmt14Coverage(std::move(cmapFmt14Coverage)) {} |
| |
| // Read fields other than mFonts, mLocaleList. |
| // static |
| std::shared_ptr<FontFamily> FontFamily::readFromInternal(BufferReader* reader, |
| std::vector<std::shared_ptr<Font>>&& fonts, |
| uint32_t localeListId) { |
| // FamilyVariant is uint8_t |
| static_assert(sizeof(FamilyVariant) == 1); |
| FamilyVariant variant = reader->read<FamilyVariant>(); |
| // AxisTag is uint32_t |
| static_assert(sizeof(AxisTag) == 4); |
| const auto& [axesPtr, axesCount] = reader->readArray<AxisTag>(); |
| std::unordered_set<AxisTag> supportedAxes(axesPtr, axesPtr + axesCount); |
| bool isColorEmoji = static_cast<bool>(reader->read<uint8_t>()); |
| bool isCustomFallback = static_cast<bool>(reader->read<uint8_t>()); |
| SparseBitSet coverage(reader); |
| // Read mCmapFmt14Coverage. As it can have null entries, it is stored in the buffer as a sparse |
| // array (size, non-null entry count, array of (index, entry)). |
| uint32_t cmapFmt14CoverageSize = reader->read<uint32_t>(); |
| std::vector<std::unique_ptr<SparseBitSet>> cmapFmt14Coverage(cmapFmt14CoverageSize); |
| uint32_t cmapFmt14CoverageEntryCount = reader->read<uint32_t>(); |
| for (uint32_t i = 0; i < cmapFmt14CoverageEntryCount; i++) { |
| uint32_t index = reader->read<uint32_t>(); |
| cmapFmt14Coverage[index] = std::make_unique<SparseBitSet>(reader); |
| } |
| return std::shared_ptr<FontFamily>(new FontFamily( |
| localeListId, variant, std::move(fonts), std::move(supportedAxes), isColorEmoji, |
| isCustomFallback, std::move(coverage), std::move(cmapFmt14Coverage))); |
| } |
| |
| // static |
| uint32_t FontFamily::readLocaleListInternal(BufferReader* reader) { |
| return LocaleListCache::readFrom(reader); |
| } |
| |
| // Write fields other than mFonts. |
| void FontFamily::writeToInternal(BufferWriter* writer) const { |
| writer->write<FamilyVariant>(mVariant); |
| std::vector<AxisTag> axes(mSupportedAxes.begin(), mSupportedAxes.end()); |
| // Sort axes to be deterministic. |
| std::sort(axes.begin(), axes.end()); |
| writer->writeArray<AxisTag>(axes.data(), axes.size()); |
| writer->write<uint8_t>(mIsColorEmoji); |
| writer->write<uint8_t>(mIsCustomFallback); |
| mCoverage.writeTo(writer); |
| // Write mCmapFmt14Coverage as a sparse array (size, non-null entry count, |
| // array of (index, entry)) |
| writer->write<uint32_t>(mCmapFmt14Coverage.size()); |
| uint32_t cmapFmt14CoverageEntryCount = 0; |
| for (const std::unique_ptr<SparseBitSet>& coverage : mCmapFmt14Coverage) { |
| if (coverage != nullptr) cmapFmt14CoverageEntryCount++; |
| } |
| writer->write<uint32_t>(cmapFmt14CoverageEntryCount); |
| for (size_t i = 0; i < mCmapFmt14Coverage.size(); i++) { |
| if (mCmapFmt14Coverage[i] != nullptr) { |
| writer->write<uint32_t>(i); |
| mCmapFmt14Coverage[i]->writeTo(writer); |
| } |
| } |
| } |
| |
| void FontFamily::writeLocaleListInternal(BufferWriter* writer) const { |
| LocaleListCache::writeTo(writer, mLocaleListId); |
| } |
| // Compute a matching metric between two styles - 0 is an exact match |
| static int computeMatch(FontStyle style1, FontStyle style2) { |
| if (style1 == style2) return 0; |
| int score = abs(style1.weight() / 100 - style2.weight() / 100); |
| if (style1.slant() != style2.slant()) { |
| score += 2; |
| } |
| return score; |
| } |
| |
| static FontFakery computeFakery(FontStyle wanted, FontStyle actual) { |
| // If desired weight is semibold or darker, and 2 or more grades |
| // higher than actual (for example, medium 500 -> bold 700), then |
| // select fake bold. |
| bool isFakeBold = wanted.weight() >= 600 && (wanted.weight() - actual.weight()) >= 200; |
| bool isFakeItalic = wanted.slant() == FontStyle::Slant::ITALIC && |
| actual.slant() == FontStyle::Slant::UPRIGHT; |
| return FontFakery(isFakeBold, isFakeItalic); |
| } |
| |
| FakedFont FontFamily::getClosestMatch(FontStyle style) const { |
| int bestIndex = 0; |
| Font* bestFont = mFonts[bestIndex].get(); |
| int bestMatch = computeMatch(bestFont->style(), style); |
| for (size_t i = 1; i < mFonts.size(); i++) { |
| Font* font = mFonts[i].get(); |
| int match = computeMatch(font->style(), style); |
| if (i == 0 || match < bestMatch) { |
| bestFont = font; |
| bestIndex = i; |
| bestMatch = match; |
| } |
| } |
| return FakedFont{mFonts[bestIndex], computeFakery(style, bestFont->style())}; |
| } |
| |
| void FontFamily::computeCoverage() { |
| const std::shared_ptr<Font>& font = getClosestMatch(FontStyle()).font; |
| HbBlob cmapTable(font->baseFont(), MinikinFont::MakeTag('c', 'm', 'a', 'p')); |
| if (cmapTable.get() == nullptr) { |
| ALOGE("Could not get cmap table size!\n"); |
| return; |
| } |
| |
| mCoverage = CmapCoverage::getCoverage(cmapTable.get(), cmapTable.size(), &mCmapFmt14Coverage); |
| |
| for (size_t i = 0; i < mFonts.size(); ++i) { |
| std::unordered_set<AxisTag> supportedAxes = mFonts[i]->getSupportedAxes(); |
| mSupportedAxes.insert(supportedAxes.begin(), supportedAxes.end()); |
| } |
| } |
| |
| bool FontFamily::hasGlyph(uint32_t codepoint, uint32_t variationSelector) const { |
| if (variationSelector == 0) { |
| return mCoverage.get(codepoint); |
| } |
| |
| if (mCmapFmt14Coverage.empty()) { |
| return false; |
| } |
| |
| const uint16_t vsIndex = getVsIndex(variationSelector); |
| |
| if (vsIndex >= mCmapFmt14Coverage.size()) { |
| // Even if vsIndex is INVALID_VS_INDEX, we reach here since INVALID_VS_INDEX is defined to |
| // be at the maximum end of the range. |
| return false; |
| } |
| |
| const std::unique_ptr<SparseBitSet>& bitset = mCmapFmt14Coverage[vsIndex]; |
| if (bitset.get() == nullptr) { |
| return false; |
| } |
| |
| return bitset->get(codepoint); |
| } |
| |
| std::shared_ptr<FontFamily> FontFamily::createFamilyWithVariation( |
| const std::vector<FontVariation>& variations) const { |
| if (variations.empty() || mSupportedAxes.empty()) { |
| return nullptr; |
| } |
| |
| bool hasSupportedAxis = false; |
| for (const FontVariation& variation : variations) { |
| if (mSupportedAxes.find(variation.axisTag) != mSupportedAxes.end()) { |
| hasSupportedAxis = true; |
| break; |
| } |
| } |
| if (!hasSupportedAxis) { |
| // None of variation axes are suppored by this family. |
| return nullptr; |
| } |
| |
| std::vector<std::shared_ptr<Font>> fonts; |
| for (const auto& font : mFonts) { |
| bool supportedVariations = false; |
| std::unordered_set<AxisTag> supportedAxes = font->getSupportedAxes(); |
| if (!supportedAxes.empty()) { |
| for (const FontVariation& variation : variations) { |
| if (supportedAxes.find(variation.axisTag) != supportedAxes.end()) { |
| supportedVariations = true; |
| break; |
| } |
| } |
| } |
| std::shared_ptr<MinikinFont> minikinFont; |
| if (supportedVariations) { |
| minikinFont = font->typeface()->createFontWithVariation(variations); |
| } |
| if (minikinFont == nullptr) { |
| fonts.push_back(font); |
| } else { |
| fonts.push_back(Font::Builder(minikinFont).setStyle(font->style()).build()); |
| } |
| } |
| |
| return std::shared_ptr<FontFamily>( |
| new FontFamily(mLocaleListId, mVariant, std::move(fonts), mIsCustomFallback)); |
| } |
| |
| } // namespace minikin |
