/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkOTTable_glyf_DEFINED
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#define SkOTTable_glyf_DEFINED
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#include "SkEndian.h"
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#include "SkOTTableTypes.h"
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#include "SkOTTable_head.h"
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#include "SkOTTable_loca.h"
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#pragma pack(push, 1)
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struct SkOTTableGlyphData;
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extern uint8_t const * const SK_OT_GlyphData_NoOutline;
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struct SkOTTableGlyph {
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static const SK_OT_CHAR TAG0 = 'g';
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static const SK_OT_CHAR TAG1 = 'l';
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static const SK_OT_CHAR TAG2 = 'y';
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static const SK_OT_CHAR TAG3 = 'f';
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static const SK_OT_ULONG TAG = SkOTTableTAG<SkOTTableGlyph>::value;
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class Iterator {
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public:
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Iterator(const SkOTTableGlyph& glyf,
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const SkOTTableIndexToLocation& loca,
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SkOTTableHead::IndexToLocFormat locaFormat)
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: fGlyf(glyf)
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, fLocaFormat(SkOTTableHead::IndexToLocFormat::ShortOffsets == locaFormat.value ? 0 : 1)
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, fCurrentGlyphOffset(0)
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{ fLocaPtr.shortOffset = reinterpret_cast<const SK_OT_USHORT*>(&loca); }
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void advance(uint16_t num) {
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fLocaPtr.shortOffset += num << fLocaFormat;
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fCurrentGlyphOffset = fLocaFormat ? SkEndian_SwapBE32(*fLocaPtr.longOffset)
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: uint32_t(SkEndian_SwapBE16(*fLocaPtr.shortOffset) << 1);
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}
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const SkOTTableGlyphData* next() {
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uint32_t previousGlyphOffset = fCurrentGlyphOffset;
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advance(1);
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if (previousGlyphOffset == fCurrentGlyphOffset) {
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return reinterpret_cast<const SkOTTableGlyphData*>(&SK_OT_GlyphData_NoOutline);
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} else {
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return reinterpret_cast<const SkOTTableGlyphData*>(
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reinterpret_cast<const SK_OT_BYTE*>(&fGlyf) + previousGlyphOffset
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);
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}
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}
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private:
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const SkOTTableGlyph& fGlyf;
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uint16_t fLocaFormat; //0 or 1
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uint32_t fCurrentGlyphOffset;
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union LocaPtr {
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const SK_OT_USHORT* shortOffset;
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const SK_OT_ULONG* longOffset;
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} fLocaPtr;
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};
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};
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struct SkOTTableGlyphData {
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SK_OT_SHORT numberOfContours; //== -1 Composite, > 0 Simple
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SK_OT_FWORD xMin;
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SK_OT_FWORD yMin;
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SK_OT_FWORD xMax;
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SK_OT_FWORD yMax;
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struct Simple {
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SK_OT_USHORT endPtsOfContours[1/*numberOfContours*/];
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struct Instructions {
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SK_OT_USHORT length;
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SK_OT_BYTE data[1/*length*/];
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};
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union Flags {
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struct Field {
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SK_OT_BYTE_BITFIELD(
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OnCurve,
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xShortVector,
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yShortVector,
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Repeat,
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xIsSame_xShortVectorPositive,
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yIsSame_yShortVectorPositive,
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Reserved6,
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Reserved7)
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} field;
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struct Raw {
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static const SK_OT_USHORT OnCurveMask = SkTEndian_SwapBE16(1 << 0);
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static const SK_OT_USHORT xShortVectorMask = SkTEndian_SwapBE16(1 << 1);
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static const SK_OT_USHORT yShortVectorMask = SkTEndian_SwapBE16(1 << 2);
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static const SK_OT_USHORT RepeatMask = SkTEndian_SwapBE16(1 << 3);
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static const SK_OT_USHORT xIsSame_xShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 4);
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static const SK_OT_USHORT yIsSame_yShortVectorPositiveMask = SkTEndian_SwapBE16(1 << 5);
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SK_OT_BYTE value;
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} raw;
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};
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//xCoordinates
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//yCoordinates
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};
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struct Composite {
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struct Component {
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union Flags {
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struct Field {
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//8-15
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SK_OT_BYTE_BITFIELD(
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WE_HAVE_INSTRUCTIONS,
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USE_MY_METRICS,
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OVERLAP_COMPOUND,
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SCALED_COMPONENT_OFFSET,
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UNSCALED_COMPONENT_OFFSET,
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Reserved13,
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Reserved14,
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Reserved15)
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//0-7
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SK_OT_BYTE_BITFIELD(
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ARG_1_AND_2_ARE_WORDS,
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ARGS_ARE_XY_VALUES,
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ROUND_XY_TO_GRID,
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WE_HAVE_A_SCALE,
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RESERVED,
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MORE_COMPONENTS,
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WE_HAVE_AN_X_AND_Y_SCALE,
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WE_HAVE_A_TWO_BY_TWO)
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} field;
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struct Raw {
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static const SK_OT_USHORT ARG_1_AND_2_ARE_WORDS_Mask = SkTEndian_SwapBE16(1 << 0);
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static const SK_OT_USHORT ARGS_ARE_XY_VALUES_Mask = SkTEndian_SwapBE16(1 << 1);
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static const SK_OT_USHORT ROUND_XY_TO_GRID_Mask = SkTEndian_SwapBE16(1 << 2);
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static const SK_OT_USHORT WE_HAVE_A_SCALE_Mask = SkTEndian_SwapBE16(1 << 3);
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static const SK_OT_USHORT RESERVED_Mask = SkTEndian_SwapBE16(1 << 4);
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static const SK_OT_USHORT MORE_COMPONENTS_Mask = SkTEndian_SwapBE16(1 << 5);
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static const SK_OT_USHORT WE_HAVE_AN_X_AND_Y_SCALE_Mask = SkTEndian_SwapBE16(1 << 6);
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static const SK_OT_USHORT WE_HAVE_A_TWO_BY_TWO_Mask = SkTEndian_SwapBE16(1 << 7);
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static const SK_OT_USHORT WE_HAVE_INSTRUCTIONS_Mask = SkTEndian_SwapBE16(1 << 8);
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static const SK_OT_USHORT USE_MY_METRICS_Mask = SkTEndian_SwapBE16(1 << 9);
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static const SK_OT_USHORT OVERLAP_COMPOUND_Mask = SkTEndian_SwapBE16(1 << 10);
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static const SK_OT_USHORT SCALED_COMPONENT_OFFSET_Mask = SkTEndian_SwapBE16(1 << 11);
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static const SK_OT_USHORT UNSCALED_COMPONENT_OFFSET_mask = SkTEndian_SwapBE16(1 << 12);
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//Reserved
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//Reserved
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//Reserved
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SK_OT_USHORT value;
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} raw;
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} flags;
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SK_OT_USHORT glyphIndex;
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union Transform {
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union Matrix {
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/** !WE_HAVE_A_SCALE & !WE_HAVE_AN_X_AND_Y_SCALE & !WE_HAVE_A_TWO_BY_TWO */
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struct None { } none;
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/** WE_HAVE_A_SCALE */
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struct Scale {
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SK_OT_F2DOT14 a_d;
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} scale;
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/** WE_HAVE_AN_X_AND_Y_SCALE */
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struct ScaleXY {
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SK_OT_F2DOT14 a;
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SK_OT_F2DOT14 d;
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} scaleXY;
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/** WE_HAVE_A_TWO_BY_TWO */
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struct TwoByTwo {
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SK_OT_F2DOT14 a;
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SK_OT_F2DOT14 b;
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SK_OT_F2DOT14 c;
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SK_OT_F2DOT14 d;
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} twoByTwo;
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};
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/** ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */
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struct WordValue {
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SK_OT_FWORD e;
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SK_OT_FWORD f;
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SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix;
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} wordValue;
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/** !ARG_1_AND_2_ARE_WORDS & ARGS_ARE_XY_VALUES */
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struct ByteValue {
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SK_OT_CHAR e;
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SK_OT_CHAR f;
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SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix;
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} byteValue;
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/** ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */
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struct WordIndex {
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SK_OT_USHORT compoundPointIndex;
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SK_OT_USHORT componentPointIndex;
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SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix;
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} wordIndex;
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/** !ARG_1_AND_2_ARE_WORDS & !ARGS_ARE_XY_VALUES */
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struct ByteIndex {
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SK_OT_BYTE compoundPointIndex;
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SK_OT_BYTE componentPointIndex;
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SkOTTableGlyphData::Composite::Component::Transform::Matrix matrix;
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} byteIndex;
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} transform;
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} component;//[] last element does not set MORE_COMPONENTS
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/** Comes after the last Component if the last component has WE_HAVE_INSTR. */
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struct Instructions {
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SK_OT_USHORT length;
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SK_OT_BYTE data[1/*length*/];
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};
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};
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};
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#pragma pack(pop)
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#endif
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