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