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 #include "SkTypedEnum.h" 16 17 #pragma pack(push, 1) 18 19 struct SkOTTableGlyphData; 20 21 extern uint8_t const * const SK_OT_GlyphData_NoOutline; 22 23 struct SkOTTableGlyph { 24 static const SK_OT_CHAR TAG0 = 'g'; 25 static const SK_OT_CHAR TAG1 = 'l'; 26 static const SK_OT_CHAR TAG2 = 'y'; 27 static const SK_OT_CHAR TAG3 = 'f'; 28 static const SK_OT_ULONG TAG = SkOTTableTAG<SkOTTableGlyph>::value; 29 30 class Iterator { 31 public: IteratorSkOTTableGlyph32 Iterator(const SkOTTableGlyph& glyf, 33 const SkOTTableIndexToLocation& loca, 34 SkOTTableHead::IndexToLocFormat locaFormat) 35 : fGlyf(glyf) 36 , fLocaFormat(SkOTTableHead::IndexToLocFormat::ShortOffsets == locaFormat.value ? 0 : 1) 37 , fCurrentGlyphOffset(0) 38 { fLocaPtr.shortOffset = reinterpret_cast<const SK_OT_USHORT*>(&loca); } 39 advanceSkOTTableGlyph40 void advance(uint16_t num) { 41 fLocaPtr.shortOffset += num << fLocaFormat; 42 fCurrentGlyphOffset = fLocaFormat ? SkEndian_SwapBE32(*fLocaPtr.longOffset) 43 : uint32_t(SkEndian_SwapBE16(*fLocaPtr.shortOffset) << 1); 44 } nextSkOTTableGlyph45 const SkOTTableGlyphData* next() { 46 uint32_t previousGlyphOffset = fCurrentGlyphOffset; 47 advance(1); 48 if (previousGlyphOffset == fCurrentGlyphOffset) { 49 return reinterpret_cast<const SkOTTableGlyphData*>(&SK_OT_GlyphData_NoOutline); 50 } else { 51 return reinterpret_cast<const SkOTTableGlyphData*>( 52 reinterpret_cast<const SK_OT_BYTE*>(&fGlyf) + previousGlyphOffset 53 ); 54 } 55 } 56 private: 57 const SkOTTableGlyph& fGlyf; 58 uint16_t fLocaFormat; //0 or 1 59 uint32_t fCurrentGlyphOffset; 60 union LocaPtr { 61 const SK_OT_USHORT* shortOffset; 62 const SK_OT_ULONG* longOffset; 63 } fLocaPtr; 64 }; 65 }; 66 67 struct SkOTTableGlyphData { 68 SK_OT_SHORT numberOfContours; //== -1 Composite, > 0 Simple 69 SK_OT_FWORD xMin; 70 SK_OT_FWORD yMin; 71 SK_OT_FWORD xMax; 72 SK_OT_FWORD yMax; 73 74 struct Simple { 75 SK_OT_USHORT endPtsOfContours[1/*numberOfContours*/]; 76 77 struct Instructions { 78 SK_OT_USHORT length; 79 SK_OT_BYTE data[1/*length*/]; 80 }; 81 82 union Flags { 83 struct Field { 84 SK_OT_BYTE_BITFIELD( 85 OnCurve, 86 xShortVector, 87 yShortVector, 88 Repeat, 89 xIsSame_xShortVectorPositive, 90 yIsSame_yShortVectorPositive, 91 Reserved6, 92 Reserved7) 93 } field; 94 struct Raw { 95 static const SK_OT_USHORT OnCurveMask = SkTEndian_SwapBE16(1 << 0); 96 static const SK_OT_USHORT xShortVectorMask = SkTEndian_SwapBE16(1 << 1); 97 static const SK_OT_USHORT yShortVectorMask = SkTEndian_SwapBE16(1 << 2); 98 static const SK_OT_USHORT RepeatMask = SkTEndian_SwapBE16(1 << 3); 99 static const SK_OT_USHORT xIsSame_xShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 4); 100 static const SK_OT_USHORT yIsSame_yShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 5); 101 SK_OT_BYTE value; 102 } raw; 103 }; 104 105 //xCoordinates 106 //yCoordinates 107 }; 108 109 struct Composite { 110 struct Component { 111 union Flags { 112 struct Field { 113 //8-15 114 SK_OT_BYTE_BITFIELD( 115 WE_HAVE_INSTRUCTIONS, 116 USE_MY_METRICS, 117 OVERLAP_COMPOUND, 118 SCALED_COMPONENT_OFFSET, 119 UNSCALED_COMPONENT_OFFSET, 120 Reserved13, 121 Reserved14, 122 Reserved15) 123 //0-7 124 SK_OT_BYTE_BITFIELD( 125 ARG_1_AND_2_ARE_WORDS, 126 ARGS_ARE_XY_VALUES, 127 ROUND_XY_TO_GRID, 128 WE_HAVE_A_SCALE, 129 RESERVED, 130 MORE_COMPONENTS, 131 WE_HAVE_AN_X_AND_Y_SCALE, 132 WE_HAVE_A_TWO_BY_TWO) 133 } field; 134 struct Raw { 135 static const SK_OT_USHORT ARG_1_AND_2_ARE_WORDS_Mask = SkTEndian_SwapBE16(1 << 0); 136 static const SK_OT_USHORT ARGS_ARE_XY_VALUES_Mask = SkTEndian_SwapBE16(1 << 1); 137 static const SK_OT_USHORT ROUND_XY_TO_GRID_Mask = SkTEndian_SwapBE16(1 << 2); 138 static const SK_OT_USHORT WE_HAVE_A_SCALE_Mask = SkTEndian_SwapBE16(1 << 3); 139 static const SK_OT_USHORT RESERVED_Mask = SkTEndian_SwapBE16(1 << 4); 140 static const SK_OT_USHORT MORE_COMPONENTS_Mask = SkTEndian_SwapBE16(1 << 5); 141 static const SK_OT_USHORT WE_HAVE_AN_X_AND_Y_SCALE_Mask = SkTEndian_SwapBE16(1 << 6); 142 static const SK_OT_USHORT WE_HAVE_A_TWO_BY_TWO_Mask = SkTEndian_SwapBE16(1 << 7); 143 144 static const SK_OT_USHORT WE_HAVE_INSTRUCTIONS_Mask = SkTEndian_SwapBE16(1 << 8); 145 static const SK_OT_USHORT USE_MY_METRICS_Mask = SkTEndian_SwapBE16(1 << 9); 146 static const SK_OT_USHORT OVERLAP_COMPOUND_Mask = SkTEndian_SwapBE16(1 << 10); 147 static const SK_OT_USHORT SCALED_COMPONENT_OFFSET_Mask = SkTEndian_SwapBE16(1 << 11); 148 static const SK_OT_USHORT UNSCALED_COMPONENT_OFFSET_mask = SkTEndian_SwapBE16(1 << 12); 149 //Reserved 150 //Reserved 151 //Reserved 152 SK_OT_USHORT value; 153 } raw; 154 } flags; 155 SK_OT_USHORT glyphIndex; 156 union Transform { 157 union Matrix { 158 /** !WE_HAVE_A_SCALE & !WE_HAVE_AN_X_AND_Y_SCALE & !WE_HAVE_A_TWO_BY_TWO */ 159 struct None { } none; 160 /** WE_HAVE_A_SCALE */ 161 struct Scale { 162 SK_OT_F2DOT14 a_d; 163 } scale; 164 /** WE_HAVE_AN_X_AND_Y_SCALE */ 165 struct ScaleXY { 166 SK_OT_F2DOT14 a; 167 SK_OT_F2DOT14 d; 168 } scaleXY; 169 /** WE_HAVE_A_TWO_BY_TWO */ 170 struct TwoByTwo { 171 SK_OT_F2DOT14 a; 172 SK_OT_F2DOT14 b; 173 SK_OT_F2DOT14 c; 174 SK_OT_F2DOT14 d; 175 } twoByTwo; 176 }; 177 /** ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */ 178 struct WordValue { 179 SK_OT_FWORD e; 180 SK_OT_FWORD f; 181 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 182 } wordValue; 183 /** !ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */ 184 struct ByteValue { 185 SK_OT_CHAR e; 186 SK_OT_CHAR f; 187 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 188 } byteValue; 189 /** ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */ 190 struct WordIndex { 191 SK_OT_USHORT compoundPointIndex; 192 SK_OT_USHORT componentPointIndex; 193 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 194 } wordIndex; 195 /** !ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */ 196 struct ByteIndex { 197 SK_OT_BYTE compoundPointIndex; 198 SK_OT_BYTE componentPointIndex; 199 SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix; 200 } byteIndex; 201 } transform; 202 } component;//[] last element does not set MORE_COMPONENTS 203 204 /** Comes after the last Component if the last component has WE_HAVE_INSTR. */ 205 struct Instructions { 206 SK_OT_USHORT length; 207 SK_OT_BYTE data[1/*length*/]; 208 }; 209 }; 210 }; 211 212 #pragma pack(pop) 213 214 #endif 215