| 1 | /***************************************************************************/ |
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| 2 | /* */ |
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| 3 | /* ttgxvar.h */ |
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| 4 | /* */ |
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| 5 | /* TrueType GX Font Variation loader (specification) */ |
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| 6 | /* */ |
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| 7 | /* Copyright 2004 by */ |
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| 8 | /* David Turner, Robert Wilhelm, Werner Lemberg and George Williams. */ |
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| 9 | /* */ |
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| 10 | /* This file is part of the FreeType project, and may only be used, */ |
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| 11 | /* modified, and distributed under the terms of the FreeType project */ |
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| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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| 13 | /* this file you indicate that you have read the license and */ |
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| 14 | /* understand and accept it fully. */ |
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| 15 | /* */ |
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| 16 | /***************************************************************************/ |
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| 17 | |
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| 18 | |
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| 19 | #ifndef __TTGXVAR_H__ |
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| 20 | #define __TTGXVAR_H__ |
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| 21 | |
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| 22 | |
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| 23 | #include <ft2build.h> |
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| 24 | #include "ttobjs.h" |
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| 25 | |
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| 26 | |
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| 27 | FT_BEGIN_HEADER |
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| 28 | |
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| 29 | |
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| 30 | /*************************************************************************/ |
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| 31 | /* */ |
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| 32 | /* <Struct> */ |
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| 33 | /* GX_AVarCorrespondenceRec */ |
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| 34 | /* */ |
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| 35 | /* <Description> */ |
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| 36 | /* A data structure representing `shortFracCorrespondence' in `avar' */ |
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| 37 | /* table according to the specifications from Apple. */ |
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| 38 | /* */ |
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| 39 | typedef struct GX_AVarCorrespondenceRec_ |
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| 40 | { |
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| 41 | FT_Fixed fromCoord; |
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| 42 | FT_Fixed toCoord; |
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| 43 | |
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| 44 | } GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence; |
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| 45 | |
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| 46 | |
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| 47 | /*************************************************************************/ |
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| 48 | /* */ |
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| 49 | /* <Struct> */ |
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| 50 | /* GX_AVarRec */ |
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| 51 | /* */ |
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| 52 | /* <Description> */ |
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| 53 | /* Data from the segment field of `avar' table. */ |
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| 54 | /* There is one of these for each axis. */ |
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| 55 | /* */ |
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| 56 | typedef struct GX_AVarSegmentRec_ |
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| 57 | { |
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| 58 | FT_UShort pairCount; |
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| 59 | GX_AVarCorrespondence correspondence; /* array with pairCount entries */ |
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| 60 | |
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| 61 | } GX_AVarSegmentRec, *GX_AVarSegment; |
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| 62 | |
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| 63 | |
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| 64 | /*************************************************************************/ |
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| 65 | /* */ |
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| 66 | /* <Struct> */ |
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| 67 | /* GX_BlendRec */ |
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| 68 | /* */ |
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| 69 | /* <Description> */ |
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| 70 | /* Data for interpolating a font from a distortable font specified */ |
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| 71 | /* by the GX *var tables ([fgca]var). */ |
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| 72 | /* */ |
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| 73 | /* <Fields> */ |
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| 74 | /* num_axis :: The number of axes along which interpolation */ |
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| 75 | /* may happen */ |
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| 76 | /* */ |
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| 77 | /* normalizedcoords :: A normalized value (between [-1,1]) indicating */ |
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| 78 | /* the contribution along each axis to the final */ |
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| 79 | /* interpolated font. */ |
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| 80 | /* */ |
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| 81 | typedef struct GX_BlendRec_ |
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| 82 | { |
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| 83 | FT_UInt num_axis; |
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| 84 | FT_Fixed* normalizedcoords; |
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| 85 | |
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| 86 | FT_MM_Var* mmvar; |
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| 87 | FT_Int mmvar_len; |
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| 88 | |
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| 89 | FT_Bool avar_checked; |
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| 90 | GX_AVarSegment avar_segment; |
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| 91 | |
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| 92 | FT_UInt tuplecount; /* shared tuples in `gvar' */ |
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| 93 | FT_Fixed* tuplecoords; /* tuplecoords[tuplecount][num_axis] */ |
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| 94 | |
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| 95 | FT_UInt gv_glyphcnt; |
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| 96 | FT_ULong* glyphoffsets; |
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| 97 | |
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| 98 | } GX_BlendRec; |
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| 99 | |
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| 100 | |
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| 101 | /*************************************************************************/ |
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| 102 | /* */ |
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| 103 | /* <enum> */ |
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| 104 | /* GX_TupleCountFlags */ |
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| 105 | /* */ |
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| 106 | /* <Description> */ |
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| 107 | /* Flags used within the `TupleCount' field of the `gvar' table. */ |
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| 108 | /* */ |
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| 109 | typedef enum GX_TupleCountFlags_ |
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| 110 | { |
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| 111 | GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000, |
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| 112 | GX_TC_RESERVED_TUPLE_FLAGS = 0x7000, |
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| 113 | GX_TC_TUPLE_COUNT_MASK = 0x0FFF |
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| 114 | |
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| 115 | } GX_TupleCountFlags; |
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| 116 | |
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| 117 | |
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| 118 | /*************************************************************************/ |
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| 119 | /* */ |
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| 120 | /* <enum> */ |
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| 121 | /* GX_TupleIndexFlags */ |
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| 122 | /* */ |
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| 123 | /* <Description> */ |
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| 124 | /* Flags used within the `TupleIndex' field of the `gvar' and `cvar' */ |
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| 125 | /* tables. */ |
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| 126 | /* */ |
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| 127 | typedef enum GX_TupleIndexFlags_ |
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| 128 | { |
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| 129 | GX_TI_EMBEDDED_TUPLE_COORD = 0x8000, |
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| 130 | GX_TI_INTERMEDIATE_TUPLE = 0x4000, |
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| 131 | GX_TI_PRIVATE_POINT_NUMBERS = 0x2000, |
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| 132 | GX_TI_RESERVED_TUPLE_FLAG = 0x1000, |
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| 133 | GX_TI_TUPLE_INDEX_MASK = 0x0FFF |
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| 134 | |
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| 135 | } GX_TupleIndexFlags; |
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| 136 | |
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| 137 | |
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| 138 | #define TTAG_wght FT_MAKE_TAG( 'w', 'g', 'h', 't' ) |
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| 139 | #define TTAG_wdth FT_MAKE_TAG( 'w', 'd', 't', 'h' ) |
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| 140 | #define TTAG_opsz FT_MAKE_TAG( 'o', 'p', 's', 'z' ) |
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| 141 | #define TTAG_slnt FT_MAKE_TAG( 's', 'l', 'n', 't' ) |
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| 142 | |
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| 143 | |
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| 144 | FT_LOCAL( FT_Error ) |
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| 145 | TT_Set_MM_Blend( TT_Face face, |
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| 146 | FT_UInt num_coords, |
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| 147 | FT_Fixed* coords ); |
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| 148 | |
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| 149 | FT_LOCAL( FT_Error ) |
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| 150 | TT_Set_Var_Design( TT_Face face, |
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| 151 | FT_UInt num_coords, |
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| 152 | FT_Fixed* coords ); |
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| 153 | |
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| 154 | FT_LOCAL( FT_Error ) |
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| 155 | TT_Get_MM_Var( TT_Face face, |
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| 156 | FT_MM_Var* *master ); |
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| 157 | |
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| 158 | |
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| 159 | FT_LOCAL( FT_Error ) |
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| 160 | tt_face_vary_cvt( TT_Face face, |
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| 161 | FT_Stream stream ); |
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| 162 | |
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| 163 | |
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| 164 | FT_LOCAL( FT_Error ) |
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| 165 | TT_Vary_Get_Glyph_Deltas( TT_Face face, |
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| 166 | FT_UInt glyph_index, |
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| 167 | FT_Vector* *deltas, |
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| 168 | FT_UInt n_points ); |
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| 169 | |
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| 170 | |
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| 171 | FT_LOCAL( void ) |
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| 172 | tt_done_blend( FT_Memory memory, |
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| 173 | GX_Blend blend ); |
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| 174 | |
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| 175 | |
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| 176 | FT_END_HEADER |
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| 177 | |
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| 178 | |
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| 179 | #endif /* __TTGXVAR_H__ */ |
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| 180 | |
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| 181 | |
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| 182 | /* END */ |
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