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- /*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "src/sfnt/SkOTUtils.h"
- #include "include/core/SkData.h"
- #include "include/core/SkStream.h"
- #include "include/private/SkTo.h"
- #include "src/core/SkAdvancedTypefaceMetrics.h"
- #include "src/core/SkEndian.h"
- #include "src/sfnt/SkOTTableTypes.h"
- #include "src/sfnt/SkOTTable_head.h"
- #include "src/sfnt/SkOTTable_name.h"
- #include "src/sfnt/SkSFNTHeader.h"
- extern const uint8_t SK_OT_GlyphData_NoOutline[] = {
- 0x0,0x0, //SkOTTableGlyphData::numberOfContours
- 0x0,0x0, //SkOTTableGlyphData::xMin
- 0x0,0x0, //SkOTTableGlyphData::yMin
- 0x0,0x0, //SkOTTableGlyphData::xMax
- 0x0,0x0, //SkOTTableGlyphData::yMax
- 0x0,0x0, //SkOTTableGlyphDataInstructions::length
- };
- uint32_t SkOTUtils::CalcTableChecksum(SK_OT_ULONG *data, size_t length) {
- uint32_t sum = 0;
- SK_OT_ULONG *dataEnd = data + ((length + 3) & ~3) / sizeof(SK_OT_ULONG);
- for (; data < dataEnd; ++data) {
- sum += SkEndian_SwapBE32(*data);
- }
- return sum;
- }
- SkData* SkOTUtils::RenameFont(SkStreamAsset* fontData, const char* fontName, int fontNameLen) {
- // Get the sfnt header.
- SkSFNTHeader sfntHeader;
- if (fontData->read(&sfntHeader, sizeof(sfntHeader)) < sizeof(sfntHeader)) {
- return nullptr;
- }
- // Find the existing 'name' table.
- int tableIndex;
- SkSFNTHeader::TableDirectoryEntry tableEntry;
- int numTables = SkEndian_SwapBE16(sfntHeader.numTables);
- for (tableIndex = 0; tableIndex < numTables; ++tableIndex) {
- if (fontData->read(&tableEntry, sizeof(tableEntry)) < sizeof(tableEntry)) {
- return nullptr;
- }
- if (SkOTTableName::TAG == tableEntry.tag) {
- break;
- }
- }
- if (tableIndex == numTables) {
- return nullptr;
- }
- if (!fontData->rewind()) {
- return nullptr;
- }
- // The required 'name' record types: Family, Style, Unique, Full and PostScript.
- const SkOTTableName::Record::NameID::Predefined::Value namesToCreate[] = {
- SkOTTableName::Record::NameID::Predefined::FontFamilyName,
- SkOTTableName::Record::NameID::Predefined::FontSubfamilyName,
- SkOTTableName::Record::NameID::Predefined::UniqueFontIdentifier,
- SkOTTableName::Record::NameID::Predefined::FullFontName,
- SkOTTableName::Record::NameID::Predefined::PostscriptName,
- };
- const int namesCount = SK_ARRAY_COUNT(namesToCreate);
- // Copy the data, leaving out the old name table.
- // In theory, we could also remove the DSIG table if it exists.
- size_t nameTableLogicalSize = sizeof(SkOTTableName) + (namesCount * sizeof(SkOTTableName::Record)) + (fontNameLen * sizeof(wchar_t));
- size_t nameTablePhysicalSize = (nameTableLogicalSize + 3) & ~3; // Rounded up to a multiple of 4.
- size_t oldNameTablePhysicalSize = (SkEndian_SwapBE32(tableEntry.logicalLength) + 3) & ~3; // Rounded up to a multiple of 4.
- size_t oldNameTableOffset = SkEndian_SwapBE32(tableEntry.offset);
- //originalDataSize is the size of the original data without the name table.
- size_t originalDataSize = fontData->getLength() - oldNameTablePhysicalSize;
- size_t newDataSize = originalDataSize + nameTablePhysicalSize;
- auto rewrittenFontData = SkData::MakeUninitialized(newDataSize);
- SK_OT_BYTE* data = static_cast<SK_OT_BYTE*>(rewrittenFontData->writable_data());
- if (fontData->read(data, oldNameTableOffset) < oldNameTableOffset) {
- return nullptr;
- }
- if (fontData->skip(oldNameTablePhysicalSize) < oldNameTablePhysicalSize) {
- return nullptr;
- }
- if (fontData->read(data + oldNameTableOffset, originalDataSize - oldNameTableOffset) < originalDataSize - oldNameTableOffset) {
- return nullptr;
- }
- //Fix up the offsets of the directory entries after the old 'name' table entry.
- SkSFNTHeader::TableDirectoryEntry* currentEntry = reinterpret_cast<SkSFNTHeader::TableDirectoryEntry*>(data + sizeof(SkSFNTHeader));
- SkSFNTHeader::TableDirectoryEntry* endEntry = currentEntry + numTables;
- SkSFNTHeader::TableDirectoryEntry* headTableEntry = nullptr;
- for (; currentEntry < endEntry; ++currentEntry) {
- uint32_t oldOffset = SkEndian_SwapBE32(currentEntry->offset);
- if (oldOffset > oldNameTableOffset) {
- currentEntry->offset = SkEndian_SwapBE32(SkToU32(oldOffset - oldNameTablePhysicalSize));
- }
- if (SkOTTableHead::TAG == currentEntry->tag) {
- headTableEntry = currentEntry;
- }
- }
- // Make the table directory entry point to the new 'name' table.
- SkSFNTHeader::TableDirectoryEntry* nameTableEntry = reinterpret_cast<SkSFNTHeader::TableDirectoryEntry*>(data + sizeof(SkSFNTHeader)) + tableIndex;
- nameTableEntry->logicalLength = SkEndian_SwapBE32(SkToU32(nameTableLogicalSize));
- nameTableEntry->offset = SkEndian_SwapBE32(SkToU32(originalDataSize));
- // Write the new 'name' table after the original font data.
- SkOTTableName* nameTable = reinterpret_cast<SkOTTableName*>(data + originalDataSize);
- unsigned short stringOffset = sizeof(SkOTTableName) + (namesCount * sizeof(SkOTTableName::Record));
- nameTable->format = SkOTTableName::format_0;
- nameTable->count = SkEndian_SwapBE16(namesCount);
- nameTable->stringOffset = SkEndian_SwapBE16(stringOffset);
- SkOTTableName::Record* nameRecords = reinterpret_cast<SkOTTableName::Record*>(data + originalDataSize + sizeof(SkOTTableName));
- for (int i = 0; i < namesCount; ++i) {
- nameRecords[i].platformID.value = SkOTTableName::Record::PlatformID::Windows;
- nameRecords[i].encodingID.windows.value = SkOTTableName::Record::EncodingID::Windows::UnicodeBMPUCS2;
- nameRecords[i].languageID.windows.value = SkOTTableName::Record::LanguageID::Windows::English_UnitedStates;
- nameRecords[i].nameID.predefined.value = namesToCreate[i];
- nameRecords[i].offset = SkEndian_SwapBE16(0);
- nameRecords[i].length = SkEndian_SwapBE16(SkToU16(fontNameLen * sizeof(wchar_t)));
- }
- SK_OT_USHORT* nameString = reinterpret_cast<SK_OT_USHORT*>(data + originalDataSize + stringOffset);
- for (int i = 0; i < fontNameLen; ++i) {
- nameString[i] = SkEndian_SwapBE16(fontName[i]);
- }
- unsigned char* logical = data + originalDataSize + nameTableLogicalSize;
- unsigned char* physical = data + originalDataSize + nameTablePhysicalSize;
- for (; logical < physical; ++logical) {
- *logical = 0;
- }
- // Update the table checksum in the directory entry.
- nameTableEntry->checksum = SkEndian_SwapBE32(SkOTUtils::CalcTableChecksum(reinterpret_cast<SK_OT_ULONG*>(nameTable), nameTableLogicalSize));
- // Update the checksum adjustment in the head table.
- if (headTableEntry) {
- size_t headTableOffset = SkEndian_SwapBE32(headTableEntry->offset);
- if (headTableOffset + sizeof(SkOTTableHead) < originalDataSize) {
- SkOTTableHead* headTable = reinterpret_cast<SkOTTableHead*>(data + headTableOffset);
- headTable->checksumAdjustment = SkEndian_SwapBE32(0);
- uint32_t unadjustedFontChecksum = SkOTUtils::CalcTableChecksum(reinterpret_cast<SK_OT_ULONG*>(data), originalDataSize + nameTablePhysicalSize);
- headTable->checksumAdjustment = SkEndian_SwapBE32(SkOTTableHead::fontChecksum - unadjustedFontChecksum);
- }
- }
- return rewrittenFontData.release();
- }
- sk_sp<SkOTUtils::LocalizedStrings_NameTable>
- SkOTUtils::LocalizedStrings_NameTable::Make(const SkTypeface& typeface,
- SK_OT_USHORT types[],
- int typesCount)
- {
- static const SkFontTableTag nameTag = SkSetFourByteTag('n','a','m','e');
- size_t nameTableSize = typeface.getTableSize(nameTag);
- if (0 == nameTableSize) {
- return nullptr;
- }
- std::unique_ptr<uint8_t[]> nameTableData(new uint8_t[nameTableSize]);
- size_t copied = typeface.getTableData(nameTag, 0, nameTableSize, nameTableData.get());
- if (copied != nameTableSize) {
- return nullptr;
- }
- return sk_sp<SkOTUtils::LocalizedStrings_NameTable>(
- new SkOTUtils::LocalizedStrings_NameTable(std::move(nameTableData), nameTableSize,
- types, typesCount));
- }
- sk_sp<SkOTUtils::LocalizedStrings_NameTable>
- SkOTUtils::LocalizedStrings_NameTable::MakeForFamilyNames(const SkTypeface& typeface) {
- return Make(typeface,
- SkOTUtils::LocalizedStrings_NameTable::familyNameTypes,
- SK_ARRAY_COUNT(SkOTUtils::LocalizedStrings_NameTable::familyNameTypes));
- }
- bool SkOTUtils::LocalizedStrings_NameTable::next(SkTypeface::LocalizedString* localizedString) {
- do {
- SkOTTableName::Iterator::Record record;
- if (fFamilyNameIter.next(record)) {
- localizedString->fString = record.name;
- localizedString->fLanguage = record.language;
- return true;
- }
- if (fTypesCount == fTypesIndex + 1) {
- return false;
- }
- ++fTypesIndex;
- fFamilyNameIter.reset(fTypes[fTypesIndex]);
- } while (true);
- }
- SK_OT_USHORT SkOTUtils::LocalizedStrings_NameTable::familyNameTypes[3] = {
- SkOTTableName::Record::NameID::Predefined::FontFamilyName,
- SkOTTableName::Record::NameID::Predefined::PreferredFamily,
- SkOTTableName::Record::NameID::Predefined::WWSFamilyName,
- };
- void SkOTUtils::SetAdvancedTypefaceFlags(SkOTTableOS2_V4::Type fsType,
- SkAdvancedTypefaceMetrics* info) {
- SkASSERT(info);
- // The logic should be identical to SkTypeface_FreeType::onGetAdvancedMetrics().
- if (fsType.raw.value != 0) {
- if (SkToBool(fsType.field.Restricted) || SkToBool(fsType.field.Bitmap)) {
- info->fFlags |= SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag;
- }
- if (SkToBool(fsType.field.NoSubsetting)) {
- info->fFlags |= SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag;
- }
- }
- }
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