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 SkOTTable_head_DEFINED 9 #define SkOTTable_head_DEFINED 10 11 #include "SkEndian.h" 12 #include "SkOTTableTypes.h" 13 14 #pragma pack(push, 1) 15 16 struct SkOTTableHead { 17 static const SK_OT_CHAR TAG0 = 'h'; 18 static const SK_OT_CHAR TAG1 = 'e'; 19 static const SK_OT_CHAR TAG2 = 'a'; 20 static const SK_OT_CHAR TAG3 = 'd'; 21 static const SK_OT_ULONG TAG = SkOTTableTAG<SkOTTableHead>::value; 22 23 SK_OT_Fixed version; 24 static const SK_OT_Fixed version1 = SkTEndian_SwapBE32(0x00010000); 25 SK_OT_Fixed fontRevision; 26 static const uint32_t fontChecksum = 0xB1B0AFBA; //checksum of all TT fonts 27 SK_OT_ULONG checksumAdjustment; 28 SK_OT_ULONG magicNumber; 29 static const SK_OT_ULONG magicNumberConst = SkTEndian_SwapBE32(0x5F0F3CF5); 30 union Flags { 31 struct Field { 32 //8-15 33 SK_OT_BYTE_BITFIELD( 34 GXMetamorphosis_Apple, 35 HasStrongRTL_Apple, 36 HasIndicStyleRearrangement, 37 AgfaMicroTypeExpressProcessed, 38 FontConverted, 39 DesignedForClearType, 40 LastResort, 41 Reserved15) 42 //0-7 43 SK_OT_BYTE_BITFIELD( 44 BaselineAtY0, 45 LeftSidebearingAtX0, 46 InstructionsDependOnPointSize, 47 IntegerScaling, 48 InstructionsAlterAdvanceWidth, 49 VerticalCenteredGlyphs_Apple, 50 Reserved06, 51 RequiresLayout_Apple) 52 } field; 53 struct Raw { 54 static const SK_OT_USHORT BaselineAtY0Mask = SkTEndian_SwapBE16(1 << 0); 55 static const SK_OT_USHORT LeftSidebearingAtX0Mask = SkTEndian_SwapBE16(1 << 1); 56 static const SK_OT_USHORT InstructionsDependOnPointSizeMask = SkTEndian_SwapBE16(1 << 2); 57 static const SK_OT_USHORT IntegerScalingMask = SkTEndian_SwapBE16(1 << 3); 58 static const SK_OT_USHORT InstructionsAlterAdvanceWidthMask = SkTEndian_SwapBE16(1 << 4); 59 static const SK_OT_USHORT VerticalCenteredGlyphs_AppleMask = SkTEndian_SwapBE16(1 << 5); 60 //Reserved 61 static const SK_OT_USHORT RequiresLayout_AppleMask = SkTEndian_SwapBE16(1 << 7); 62 63 static const SK_OT_USHORT GXMetamorphosis_AppleMask = SkTEndian_SwapBE16(1 << 8); 64 static const SK_OT_USHORT HasStrongRTL_AppleMask = SkTEndian_SwapBE16(1 << 9); 65 static const SK_OT_USHORT HasIndicStyleRearrangementMask = SkTEndian_SwapBE16(1 << 10); 66 static const SK_OT_USHORT AgfaMicroTypeExpressProcessedMask = SkTEndian_SwapBE16(1 << 11); 67 static const SK_OT_USHORT FontConvertedMask = SkTEndian_SwapBE16(1 << 12); 68 static const SK_OT_USHORT DesignedForClearTypeMask = SkTEndian_SwapBE16(1 << 13); 69 static const SK_OT_USHORT LastResortMask = SkTEndian_SwapBE16(1 << 14); 70 //Reserved 71 SK_OT_USHORT value; 72 } raw; 73 } flags; 74 SK_OT_USHORT unitsPerEm; 75 SK_OT_LONGDATETIME created; 76 SK_OT_LONGDATETIME modified; 77 SK_OT_SHORT xMin; 78 SK_OT_SHORT yMin; 79 SK_OT_SHORT xMax; 80 SK_OT_SHORT yMax; 81 union MacStyle { 82 struct Field { 83 //8-15 84 SK_OT_BYTE_BITFIELD( 85 Reserved08, 86 Reserved09, 87 Reserved10, 88 Reserved11, 89 Reserved12, 90 Reserved13, 91 Reserved14, 92 Reserved15) 93 //0-7 94 SK_OT_BYTE_BITFIELD( 95 Bold, 96 Italic, 97 Underline, 98 Outline, 99 Shadow, 100 Condensed, 101 Extended, 102 Reserved07) 103 } field; 104 struct Raw { 105 static const SK_OT_USHORT BoldMask = SkTEndian_SwapBE16(1); 106 static const SK_OT_USHORT ItalicMask = SkTEndian_SwapBE16(1 << 1); 107 static const SK_OT_USHORT UnderlineMask = SkTEndian_SwapBE16(1 << 2); 108 static const SK_OT_USHORT OutlineMask = SkTEndian_SwapBE16(1 << 3); 109 static const SK_OT_USHORT ShadowMask = SkTEndian_SwapBE16(1 << 4); 110 static const SK_OT_USHORT CondensedMask = SkTEndian_SwapBE16(1 << 5); 111 static const SK_OT_USHORT ExtendedMask = SkTEndian_SwapBE16(1 << 6); 112 113 SK_OT_USHORT value; 114 } raw; 115 } macStyle; 116 SK_OT_USHORT lowestRecPPEM; 117 struct FontDirectionHint { 118 enum Value : SK_OT_SHORT { 119 FullyMixedDirectionalGlyphs = SkTEndian_SwapBE16(0), 120 OnlyStronglyLTR = SkTEndian_SwapBE16(1), 121 StronglyLTR = SkTEndian_SwapBE16(2), 122 OnlyStronglyRTL = static_cast<SK_OT_SHORT>(SkTEndian_SwapBE16((uint16_t)-1)), 123 StronglyRTL = static_cast<SK_OT_SHORT>(SkTEndian_SwapBE16((uint16_t)-2)), 124 } value; 125 } fontDirectionHint; 126 struct IndexToLocFormat { 127 enum Value : SK_OT_SHORT { 128 ShortOffsets = SkTEndian_SwapBE16(0), 129 LongOffsets = SkTEndian_SwapBE16(1), 130 } value; 131 } indexToLocFormat; 132 struct GlyphDataFormat { 133 enum Value : SK_OT_SHORT { 134 CurrentFormat = SkTEndian_SwapBE16(0), 135 } value; 136 } glyphDataFormat; 137 }; 138 139 #pragma pack(pop) 140 141 142 #include <stddef.h> 143 static_assert(offsetof(SkOTTableHead, glyphDataFormat) == 52, "SkOTTableHead_glyphDataFormat_not_at_52"); 144 static_assert(sizeof(SkOTTableHead) == 54, "sizeof_SkOTTableHead_not_54"); 145 146 #endif 147