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_glyf_DEFINED 9 #define SkOTTable_glyf_DEFINED 10 11 #include "SkEndian.h" 12 #include "SkOTTableTypes.h" 13 #include "SkOTTable_head.h" 14 #include "SkOTTable_loca.h" 15 16 #pragma pack(push, 1) 17 18 struct SkOTTableGlyphData; 19 20 extern uint8_t const * const SK_OT_GlyphData_NoOutline; 21 22 struct SkOTTableGlyph { 23 static const SK_OT_CHAR TAG0 = 'g'; 24 static const SK_OT_CHAR TAG1 = 'l'; 25 static const SK_OT_CHAR TAG2 = 'y'; 26 static const SK_OT_CHAR TAG3 = 'f'; 27 static const SK_OT_ULONG TAG = SkOTTableTAG<SkOTTableGlyph>::value; 28 29 class Iterator { 30 public: 31 Iterator(const SkOTTableGlyph& glyf, 32 const SkOTTableIndexToLocation& loca, 33 SkOTTableHead::IndexToLocFormat locaFormat) 34 : fGlyf(glyf) 35 , fLocaFormat(SkOTTableHead::IndexToLocFormat::ShortOffsets == locaFormat.value ? 0 : 1) 36 , fCurrentGlyphOffset(0) 37 { fLocaPtr.shortOffset = reinterpret_cast<const SK_OT_USHORT*>(&loca); } 38 39 void advance(uint16_t num) { 40 fLocaPtr.shortOffset += num << fLocaFormat; 41 fCurrentGlyphOffset = fLocaFormat ? SkEndian_SwapBE32(*fLocaPtr.longOffset) 42 : uint32_t(SkEndian_SwapBE16(*fLocaPtr.shortOffset) << 1); 43 } 44 const SkOTTableGlyphData* next() { 45 uint32_t previousGlyphOffset = fCurrentGlyphOffset; 46 advance(1); 47 if (previousGlyphOffset == fCurrentGlyphOffset) { 48 return reinterpret_cast<const SkOTTableGlyphData*>(&SK_OT_GlyphData_NoOutline); 49 } else { 50 return reinterpret_cast<const SkOTTableGlyphData*>( 51 reinterpret_cast<const SK_OT_BYTE*>(&fGlyf) + previousGlyphOffset 52 ); 53 } 54 } 55 private: 56 const SkOTTableGlyph& fGlyf; 57 uint16_t fLocaFormat; //0 or 1 58 uint32_t fCurrentGlyphOffset; 59 union LocaPtr { 60 const SK_OT_USHORT* shortOffset; 61 const SK_OT_ULONG* longOffset; 62 } fLocaPtr; 63 }; 64 }; 65 66 struct SkOTTableGlyphData { 67 SK_OT_SHORT numberOfContours; //== -1 Composite, > 0 Simple 68 SK_OT_FWORD xMin; 69 SK_OT_FWORD yMin; 70 SK_OT_FWORD xMax; 71 SK_OT_FWORD yMax; 72 73 struct Simple { 74 SK_OT_USHORT endPtsOfContours[1/*numberOfContours*/]; 75 76 struct Instructions { 77 SK_OT_USHORT length; 78 SK_OT_BYTE data[1/*length*/]; 79 }; 80 81 union Flags { 82 struct Field { 83 SK_OT_BYTE_BITFIELD( 84 OnCurve, 85 xShortVector, 86 yShortVector, 87 Repeat, 88 xIsSame_xShortVectorPositive, 89 yIsSame_yShortVectorPositive, 90 Reserved6, 91 Reserved7) 92 } field; 93 struct Raw { 94 static const SK_OT_USHORT OnCurveMask = SkTEndian_SwapBE16(1 << 0); 95 static const SK_OT_USHORT xShortVectorMask = SkTEndian_SwapBE16(1 << 1); 96 static const SK_OT_USHORT yShortVectorMask = SkTEndian_SwapBE16(1 << 2); 97 static const SK_OT_USHORT RepeatMask = SkTEndian_SwapBE16(1 << 3); 98 static const SK_OT_USHORT xIsSame_xShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 4); 99 static const SK_OT_USHORT yIsSame_yShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 5); 100 SK_OT_BYTE value; 101 } raw; 102 }; 103 104 //xCoordinates 105 //yCoordinates 106 }; 107 108 struct Composite { 109 struct Component { 110 union Flags { 111 struct Field { 112 //8-15 113 SK_OT_BYTE_BITFIELD( 114 WE_HAVE_INSTRUCTIONS, 115 USE_MY_METRICS, 116 OVERLAP_COMPOUND, 117 SCALED_COMPONENT_OFFSET, 118 UNSCALED_COMPONENT_OFFSET, 119 Reserved13, 120 Reserved14, 121 Reserved15) 122 //0-7 123 SK_OT_BYTE_BITFIELD( 124 ARG_1_AND_2_ARE_WORDS, 125 ARGS_ARE_XY_VALUES, 126 ROUND_XY_TO_GRID, 127 WE_HAVE_A_SCALE, 128 RESERVED, 129 MORE_COMPONENTS, 130 WE_HAVE_AN_X_AND_Y_SCALE, 131 WE_HAVE_A_TWO_BY_TWO) 132 } field; 133 struct Raw { 134 static const SK_OT_USHORT ARG_1_AND_2_ARE_WORDS_Mask = SkTEndian_SwapBE16(1 << 0); 135 static const SK_OT_USHORT ARGS_ARE_XY_VALUES_Mask = SkTEndian_SwapBE16(1 << 1); 136 static const SK_OT_USHORT ROUND_XY_TO_GRID_Mask = SkTEndian_SwapBE16(1 << 2); 137 static const SK_OT_USHORT WE_HAVE_A_SCALE_Mask = SkTEndian_SwapBE16(1 << 3); 138 static const SK_OT_USHORT RESERVED_Mask = SkTEndian_SwapBE16(1 << 4); 139 static const SK_OT_USHORT MORE_COMPONENTS_Mask = SkTEndian_SwapBE16(1 << 5); 140 static const SK_OT_USHORT WE_HAVE_AN_X_AND_Y_SCALE_Mask = SkTEndian_SwapBE16(1 << 6); 141 static const SK_OT_USHORT WE_HAVE_A_TWO_BY_TWO_Mask = SkTEndian_SwapBE16(1 << 7); 142 143 static const SK_OT_USHORT WE_HAVE_INSTRUCTIONS_Mask = SkTEndian_SwapBE16(1 << 8); 144 static const SK_OT_USHORT USE_MY_METRICS_Mask = SkTEndian_SwapBE16(1 << 9); 145 static const SK_OT_USHORT OVERLAP_COMPOUND_Mask = SkTEndian_SwapBE16(1 << 10); 146 static const SK_OT_USHORT SCALED_COMPONENT_OFFSET_Mask = SkTEndian_SwapBE16(1 << 11); 147 static const SK_OT_USHORT UNSCALED_COMPONENT_OFFSET_mask = SkTEndian_SwapBE16(1 << 12); 148 //Reserved 149 //Reserved 150 //Reserved 151 SK_OT_USHORT value; 152 } raw; 153 } flags; 154 SK_OT_USHORT glyphIndex; 155 union Transform { 156 union Matrix { 157 /** !WE_HAVE_A_SCALE & !WE_HAVE_AN_X_AND_Y_SCALE & !WE_HAVE_A_TWO_BY_TWO */ 158 struct None { } none; 159 /** WE_HAVE_A_SCALE */ 160 struct Scale { 161 SK_OT_F2DOT14 a_d; 162 } scale; 163 /** WE_HAVE_AN_X_AND_Y_SCALE */ 164 struct ScaleXY { 165 SK_OT_F2DOT14 a; 166 SK_OT_F2DOT14 d; 167 } scaleXY; 168 /** WE_HAVE_A_TWO_BY_TWO */ 169 struct TwoByTwo { 170 SK_OT_F2DOT14 a; 171 SK_OT_F2DOT14 b; 172 SK_OT_F2DOT14 c; 173 SK_OT_F2DOT14 d; 174 } twoByTwo; 175 }; 176 /** ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */ 177 struct WordValue { 178 SK_OT_FWORD e; 179 SK_OT_FWORD f; 180 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 181 } wordValue; 182 /** !ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */ 183 struct ByteValue { 184 SK_OT_CHAR e; 185 SK_OT_CHAR f; 186 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 187 } byteValue; 188 /** ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */ 189 struct WordIndex { 190 SK_OT_USHORT compoundPointIndex; 191 SK_OT_USHORT componentPointIndex; 192 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 193 } wordIndex; 194 /** !ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */ 195 struct ByteIndex { 196 SK_OT_BYTE compoundPointIndex; 197 SK_OT_BYTE componentPointIndex; 198 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 199 } byteIndex; 200 } transform; 201 } component;//[] last element does not set MORE_COMPONENTS 202 203 /** Comes after the last Component if the last component has WE_HAVE_INSTR. */ 204 struct Instructions { 205 SK_OT_USHORT length; 206 SK_OT_BYTE data[1/*length*/]; 207 }; 208 }; 209 }; 210 211 #pragma pack(pop) 212 213 #endif 214
