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 SkSFNTHeader_DEFINED
9#define SkSFNTHeader_DEFINED
10
11#include "SkEndian.h"
12#include "SkOTTableTypes.h"
13
14//All SK_SFNT_ prefixed types should be considered as big endian.
15typedef uint16_t SK_SFNT_USHORT;
16typedef uint32_t SK_SFNT_ULONG;
17
18#pragma pack(push, 1)
19
20struct SkSFNTHeader {
21    SK_SFNT_ULONG fontType;
22    struct fontType_WindowsTrueType {
23        static const SK_OT_CHAR TAG0 = 0;
24        static const SK_OT_CHAR TAG1 = 1;
25        static const SK_OT_CHAR TAG2 = 0;
26        static const SK_OT_CHAR TAG3 = 0;
27        static const SK_OT_ULONG TAG = SkOTTableTAG<fontType_WindowsTrueType>::value;
28    };
29    struct fontType_MacTrueType {
30        static const SK_OT_CHAR TAG0 = 't';
31        static const SK_OT_CHAR TAG1 = 'r';
32        static const SK_OT_CHAR TAG2 = 'u';
33        static const SK_OT_CHAR TAG3 = 'e';
34        static const SK_OT_ULONG TAG = SkOTTableTAG<fontType_MacTrueType>::value;
35    };
36    struct fontType_PostScript {
37        static const SK_OT_CHAR TAG0 = 't';
38        static const SK_OT_CHAR TAG1 = 'y';
39        static const SK_OT_CHAR TAG2 = 'p';
40        static const SK_OT_CHAR TAG3 = '1';
41        static const SK_OT_ULONG TAG = SkOTTableTAG<fontType_PostScript>::value;
42    };
43    struct fontType_OpenTypeCFF {
44        static const SK_OT_CHAR TAG0 = 'O';
45        static const SK_OT_CHAR TAG1 = 'T';
46        static const SK_OT_CHAR TAG2 = 'T';
47        static const SK_OT_CHAR TAG3 = 'O';
48        static const SK_OT_ULONG TAG = SkOTTableTAG<fontType_OpenTypeCFF>::value;
49    };
50
51    SK_SFNT_USHORT numTables;
52    SK_SFNT_USHORT searchRange;
53    SK_SFNT_USHORT entrySelector;
54    SK_SFNT_USHORT rangeShift;
55
56    struct TableDirectoryEntry {
57        SK_SFNT_ULONG tag;
58        SK_SFNT_ULONG checksum;
59        SK_SFNT_ULONG offset; //From beginning of header.
60        SK_SFNT_ULONG logicalLength;
61    }; //tableDirectoryEntries[numTables]
62};
63
64#pragma pack(pop)
65
66
67SK_COMPILE_ASSERT(sizeof(SkSFNTHeader) == 12, sizeof_SkSFNTHeader_not_12);
68SK_COMPILE_ASSERT(sizeof(SkSFNTHeader::TableDirectoryEntry) == 16, sizeof_SkSFNTHeader_TableDirectoryEntry_not_16);
69
70#endif
71