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 "include/core/SkTypeface.h"
12#include "src/sfnt/SkOTTableTypes.h"
13#include "src/sfnt/SkOTTable_OS_2_V4.h"
14#include "src/sfnt/SkOTTable_name.h"
15
16class SkData;
17class SkStream;
18struct SkAdvancedTypefaceMetrics;
19
20struct SkOTUtils {
21 /**
22 * Calculates the OpenType checksum for data.
23 */
24 static uint32_t CalcTableChecksum(SK_OT_ULONG *data, size_t length);
25
26 /**
27 * Renames an sfnt font. On failure (invalid data or not an sfnt font)
28 * returns nullptr.
29 *
30 * Essentially, this removes any existing 'name' table and replaces it
31 * with a new one in which FontFamilyName, FontSubfamilyName,
32 * UniqueFontIdentifier, FullFontName, and PostscriptName are fontName.
33 *
34 * The new 'name' table records will be written with the Windows,
35 * UnicodeBMPUCS2, and English_UnitedStates settings.
36 *
37 * fontName and fontNameLen must be specified in terms of ASCII chars.
38 *
39 * Does not affect fontData's ownership.
40 */
41 static SkData* RenameFont(SkStreamAsset* fontData, const char* fontName, int fontNameLen);
42
43 /** An implementation of LocalizedStrings which obtains it's data from a 'name' table. */
44 class LocalizedStrings_NameTable : public SkTypeface::LocalizedStrings {
45 public:
46 /** Takes ownership of the nameTableData and will free it with SK_DELETE. */
47 LocalizedStrings_NameTable(std::unique_ptr<uint8_t[]> nameTableData, size_t size,
48 SK_OT_USHORT types[],
49 int typesCount)
50 : fTypes(types), fTypesCount(typesCount), fTypesIndex(0)
51 , fNameTableData(std::move(nameTableData))
52 , fFamilyNameIter(fNameTableData.get(), size, fTypes[fTypesIndex])
53 { }
54
55 /** Creates an iterator over all data in the 'name' table of a typeface.
56 * If no valid 'name' table can be found, returns nullptr.
57 */
58 static sk_sp<LocalizedStrings_NameTable> Make(
59 const SkTypeface& typeface,
60 SK_OT_USHORT types[],
61 int typesCount);
62
63 /** Creates an iterator over all the family names in the 'name' table of a typeface.
64 * If no valid 'name' table can be found, returns nullptr.
65 */
66 static sk_sp<LocalizedStrings_NameTable> MakeForFamilyNames(const SkTypeface& typeface);
67
68 bool next(SkTypeface::LocalizedString* localizedString) override;
69 private:
70 static SK_OT_USHORT familyNameTypes[3];
71
72 SK_OT_USHORT* fTypes;
73 int fTypesCount;
74 int fTypesIndex;
75 std::unique_ptr<uint8_t[]> fNameTableData;
76 SkOTTableName::Iterator fFamilyNameIter;
77 };
78
79 /** An implementation of LocalizedStrings which has one name. */
80 class LocalizedStrings_SingleName : public SkTypeface::LocalizedStrings {
81 public:
82 LocalizedStrings_SingleName(SkString name, SkString language)
83 : fName(name), fLanguage(language), fHasNext(true)
84 { }
85
86 bool next(SkTypeface::LocalizedString* localizedString) override {
87 localizedString->fString = fName;
88 localizedString->fLanguage = fLanguage;
89
90 bool hadNext = fHasNext;
91 fHasNext = false;
92 return hadNext;
93 }
94
95 private:
96 SkString fName;
97 SkString fLanguage;
98 bool fHasNext;
99 };
100
101 static void SetAdvancedTypefaceFlags(SkOTTableOS2_V4::Type fsType,
102 SkAdvancedTypefaceMetrics* info);
103};
104
105#endif
106