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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 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