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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* cf2blues.h */ | |
| 4 /* */ | |
| 5 /* Adobe's code for handling Blue Zones (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 2009-2013 Adobe Systems Incorporated. */ | |
| 8 /* */ | |
| 9 /* This software, and all works of authorship, whether in source or */ | |
| 10 /* object code form as indicated by the copyright notice(s) included */ | |
| 11 /* herein (collectively, the "Work") is made available, and may only be */ | |
| 12 /* used, modified, and distributed under the FreeType Project License, */ | |
| 13 /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ | |
| 14 /* FreeType Project License, each contributor to the Work hereby grants */ | |
| 15 /* to any individual or legal entity exercising permissions granted by */ | |
| 16 /* the FreeType Project License and this section (hereafter, "You" or */ | |
| 17 /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ | |
| 18 /* royalty-free, irrevocable (except as stated in this section) patent */ | |
| 19 /* license to make, have made, use, offer to sell, sell, import, and */ | |
| 20 /* otherwise transfer the Work, where such license applies only to those */ | |
| 21 /* patent claims licensable by such contributor that are necessarily */ | |
| 22 /* infringed by their contribution(s) alone or by combination of their */ | |
| 23 /* contribution(s) with the Work to which such contribution(s) was */ | |
| 24 /* submitted. If You institute patent litigation against any entity */ | |
| 25 /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ | |
| 26 /* the Work or a contribution incorporated within the Work constitutes */ | |
| 27 /* direct or contributory patent infringement, then any patent licenses */ | |
| 28 /* granted to You under this License for that Work shall terminate as of */ | |
| 29 /* the date such litigation is filed. */ | |
| 30 /* */ | |
| 31 /* By using, modifying, or distributing the Work you indicate that you */ | |
| 32 /* have read and understood the terms and conditions of the */ | |
| 33 /* FreeType Project License as well as those provided in this section, */ | |
| 34 /* and you accept them fully. */ | |
| 35 /* */ | |
| 36 /***************************************************************************/ | |
| 37 | |
| 38 | |
| 39 /* | |
| 40 * A `CF2_Blues' object stores the blue zones (horizontal alignment | |
| 41 * zones) of a font. These are specified in the CFF private dictionary | |
| 42 * by `BlueValues', `OtherBlues', `FamilyBlues', and `FamilyOtherBlues'. | |
| 43 * Each zone is defined by a top and bottom edge in character space. | |
| 44 * Further, each zone is either a top zone or a bottom zone, as recorded | |
| 45 * by `bottomZone'. | |
| 46 * | |
| 47 * The maximum number of `BlueValues' and `FamilyBlues' is 7 each. | |
| 48 * However, these are combined to produce a total of 7 zones. | |
| 49 * Similarly, the maximum number of `OtherBlues' and `FamilyOtherBlues' | |
| 50 * is 5 and these are combined to produce an additional 5 zones. | |
| 51 * | |
| 52 * Blue zones are used to `capture' hints and force them to a common | |
| 53 * alignment point. This alignment is recorded in device space in | |
| 54 * `dsFlatEdge'. Except for this value, a `CF2_Blues' object could be | |
| 55 * constructed independently of scaling. Construction may occur once | |
| 56 * the matrix is known. Other features implemented in the Capture | |
| 57 * method are overshoot suppression, overshoot enforcement, and Blue | |
| 58 * Boost. | |
| 59 * | |
| 60 * Capture is determined by `BlueValues' and `OtherBlues', but the | |
| 61 * alignment point may be adjusted to the scaled flat edge of | |
| 62 * `FamilyBlues' or `FamilyOtherBlues'. No alignment is done to the | |
| 63 * curved edge of a zone. | |
| 64 * | |
| 65 */ | |
| 66 | |
| 67 | |
| 68 #ifndef __CF2BLUES_H__ | |
| 69 #define __CF2BLUES_H__ | |
| 70 | |
| 71 | |
| 72 #include "cf2glue.h" | |
| 73 | |
| 74 | |
| 75 FT_BEGIN_HEADER | |
| 76 | |
| 77 | |
| 78 /* | |
| 79 * `CF2_Hint' is shared by `cf2hints.h' and | |
| 80 * `cf2blues.h', but `cf2blues.h' depends on | |
| 81 * `cf2hints.h', so define it here. Note: The typedef is in | |
| 82 * `cf2glue.h'. | |
| 83 * | |
| 84 */ | |
| 85 enum | |
| 86 { | |
| 87 CF2_GhostBottom = 0x1, /* a single bottom edge */ | |
| 88 CF2_GhostTop = 0x2, /* a single top edge */ | |
| 89 CF2_PairBottom = 0x4, /* the bottom edge of a stem hint */ | |
| 90 CF2_PairTop = 0x8, /* the top edge of a stem hint */ | |
| 91 CF2_Locked = 0x10, /* this edge has been aligned */ | |
| 92 /* by a blue zone */ | |
| 93 CF2_Synthetic = 0x20 /* this edge was synthesized */ | |
| 94 }; | |
| 95 | |
| 96 | |
| 97 /* | |
| 98 * Default value for OS/2 typoAscender/Descender when their difference | |
| 99 * is not equal to `unitsPerEm'. The default is based on -250 and 1100 | |
| 100 * in `CF2_Blues', assuming 1000 units per em here. | |
| 101 * | |
| 102 */ | |
| 103 enum | |
| 104 { | |
| 105 CF2_ICF_Top = cf2_intToFixed( 880 ), | |
| 106 CF2_ICF_Bottom = cf2_intToFixed( -120 ) | |
| 107 }; | |
| 108 | |
| 109 | |
| 110 /* | |
| 111 * Constant used for hint adjustment and for synthetic em box hint | |
| 112 * placement. | |
| 113 */ | |
| 114 #define CF2_MIN_COUNTER cf2_floatToFixed( 0.5 ) | |
| 115 | |
| 116 | |
| 117 /* shared typedef is in cf2glue.h */ | |
| 118 struct CF2_HintRec_ | |
| 119 { | |
| 120 CF2_UInt flags; /* attributes of the edge */ | |
| 121 size_t index; /* index in original stem hint array */ | |
| 122 /* (if not synthetic) */ | |
| 123 CF2_Fixed csCoord; | |
| 124 CF2_Fixed dsCoord; | |
| 125 CF2_Fixed scale; | |
| 126 }; | |
| 127 | |
| 128 | |
| 129 typedef struct CF2_BlueRec_ | |
| 130 { | |
| 131 CF2_Fixed csBottomEdge; | |
| 132 CF2_Fixed csTopEdge; | |
| 133 CF2_Fixed csFlatEdge; /* may be from either local or Family zones */ | |
| 134 CF2_Fixed dsFlatEdge; /* top edge of bottom zone or bottom edge */ | |
| 135 /* of top zone (rounded) */ | |
| 136 FT_Bool bottomZone; | |
| 137 | |
| 138 } CF2_BlueRec; | |
| 139 | |
| 140 | |
| 141 /* max total blue zones is 12 */ | |
| 142 enum | |
| 143 { | |
| 144 CF2_MAX_BLUES = 7, | |
| 145 CF2_MAX_OTHERBLUES = 5 | |
| 146 }; | |
| 147 | |
| 148 | |
| 149 typedef struct CF2_BluesRec_ | |
| 150 { | |
| 151 CF2_Fixed scale; | |
| 152 CF2_UInt count; | |
| 153 FT_Bool suppressOvershoot; | |
| 154 FT_Bool doEmBoxHints; | |
| 155 | |
| 156 CF2_Fixed blueScale; | |
| 157 CF2_Fixed blueShift; | |
| 158 CF2_Fixed blueFuzz; | |
| 159 | |
| 160 CF2_Fixed boost; | |
| 161 | |
| 162 CF2_HintRec emBoxTopEdge; | |
| 163 CF2_HintRec emBoxBottomEdge; | |
| 164 | |
| 165 CF2_BlueRec zone[CF2_MAX_BLUES + CF2_MAX_OTHERBLUES]; | |
| 166 | |
| 167 } CF2_BluesRec, *CF2_Blues; | |
| 168 | |
| 169 | |
| 170 FT_LOCAL( void ) | |
| 171 cf2_blues_init( CF2_Blues blues, | |
| 172 CF2_Font font ); | |
| 173 FT_LOCAL( FT_Bool ) | |
| 174 cf2_blues_capture( const CF2_Blues blues, | |
| 175 CF2_Hint bottomHintEdge, | |
| 176 CF2_Hint topHintEdge ); | |
| 177 | |
| 178 | |
| 179 FT_END_HEADER | |
| 180 | |
| 181 | |
| 182 #endif /* __CF2BLUES_H__ */ | |
| 183 | |
| 184 | |
| 185 /* END */ | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
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