1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkOTUtils_DEFINED 9 #define SkOTUtils_DEFINED 10 11 #include "SkOTTableTypes.h" 12 #include "SkOTTable_name.h" 13 #include "SkTypeface.h" 14 15 class SkData; 16 class SkStream; 17 18 struct SkOTUtils { 19 /** 20 * Calculates the OpenType checksum for data. 21 */ 22 static uint32_t CalcTableChecksum(SK_OT_ULONG *data, size_t length); 23 24 /** 25 * Renames an sfnt font. On failure (invalid data or not an sfnt font) 26 * returns nullptr. 27 * 28 * Essentially, this removes any existing 'name' table and replaces it 29 * with a new one in which FontFamilyName, FontSubfamilyName, 30 * UniqueFontIdentifier, FullFontName, and PostscriptName are fontName. 31 * 32 * The new 'name' table records will be written with the Windows, 33 * UnicodeBMPUCS2, and English_UnitedStates settings. 34 * 35 * fontName and fontNameLen must be specified in terms of ASCII chars. 36 * 37 * Does not affect fontData's ownership. 38 */ 39 static SkData* RenameFont(SkStreamAsset* fontData, const char* fontName, int fontNameLen); 40 41 /** An implementation of LocalizedStrings which obtains it's data from a 'name' table. */ 42 class LocalizedStrings_NameTable : public SkTypeface::LocalizedStrings { 43 public: 44 /** Takes ownership of the nameTableData and will free it with SK_DELETE. */ LocalizedStrings_NameTableSkOTUtils45 LocalizedStrings_NameTable(SkOTTableName* nameTableData, 46 SkOTTableName::Record::NameID::Predefined::Value types[], 47 int typesCount) 48 : fTypes(types), fTypesCount(typesCount), fTypesIndex(0) 49 , fNameTableData(nameTableData), fFamilyNameIter(*nameTableData, fTypes[fTypesIndex]) 50 { } 51 52 /** Creates an iterator over all the family names in the 'name' table of a typeface. 53 * If no valid 'name' table can be found, returns nullptr. 54 */ 55 static LocalizedStrings_NameTable* CreateForFamilyNames(const SkTypeface& typeface); 56 57 bool next(SkTypeface::LocalizedString* localizedString) override; 58 private: 59 static SkOTTableName::Record::NameID::Predefined::Value familyNameTypes[3]; 60 61 SkOTTableName::Record::NameID::Predefined::Value* fTypes; 62 int fTypesCount; 63 int fTypesIndex; 64 std::unique_ptr<SkOTTableName[]> fNameTableData; 65 SkOTTableName::Iterator fFamilyNameIter; 66 }; 67 68 /** An implementation of LocalizedStrings which has one name. */ 69 class LocalizedStrings_SingleName : public SkTypeface::LocalizedStrings { 70 public: LocalizedStrings_SingleNameSkOTUtils71 LocalizedStrings_SingleName(SkString name, SkString language) 72 : fName(name), fLanguage(language), fHasNext(true) 73 { } 74 nextSkOTUtils75 bool next(SkTypeface::LocalizedString* localizedString) override { 76 localizedString->fString = fName; 77 localizedString->fLanguage = fLanguage; 78 79 bool hadNext = fHasNext; 80 fHasNext = false; 81 return hadNext; 82 } 83 84 private: 85 SkString fName; 86 SkString fLanguage; 87 bool fHasNext; 88 }; 89 }; 90 91 #endif 92