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      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 NULL.
     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. */
     45         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 NULL.
     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         SkAutoTDeleteArray<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:
     71         LocalizedStrings_SingleName(SkString name, SkString language)
     72             : fName(name), fLanguage(language), fHasNext(true)
     73         { }
     74 
     75         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