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. 15 typedef uint16_t SK_SFNT_USHORT; 16 typedef uint32_t SK_SFNT_ULONG; 17 18 #pragma pack(push, 1) 19 20 struct 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 67 static_assert(sizeof(SkSFNTHeader) == 12, "sizeof_SkSFNTHeader_not_12"); 68 static_assert(sizeof(SkSFNTHeader::TableDirectoryEntry) == 16, "sizeof_SkSFNTHeader_TableDirectoryEntry_not_16"); 69 70 #endif 71
