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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftadvanc.h */ | |
| 4 /* */ | |
| 5 /* Quick computation of advance widths (specification only). */ | |
| 6 /* */ | |
| 7 /* Copyright 2008, 2013, 2014 by */ | |
| 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 /* */ | |
| 10 /* This file is part of the FreeType project, and may only be used, */ | |
| 11 /* modified, and distributed under the terms of the FreeType project */ | |
| 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 /* this file you indicate that you have read the license and */ | |
| 14 /* understand and accept it fully. */ | |
| 15 /* */ | |
| 16 /***************************************************************************/ | |
| 17 | |
| 18 | |
| 19 #ifndef __FTADVANC_H__ | |
| 20 #define __FTADVANC_H__ | |
| 21 | |
| 22 | |
| 23 #include <ft2build.h> | |
| 24 #include FT_FREETYPE_H | |
| 25 | |
| 26 #ifdef FREETYPE_H | |
| 27 #error "freetype.h of FreeType 1 has been loaded!" | |
| 28 #error "Please fix the directory search order for header files" | |
| 29 #error "so that freetype.h of FreeType 2 is found first." | |
| 30 #endif | |
| 31 | |
| 32 | |
| 33 FT_BEGIN_HEADER | |
| 34 | |
| 35 | |
| 36 /************************************************************************** | |
| 37 * | |
| 38 * @section: | |
| 39 * quick_advance | |
| 40 * | |
| 41 * @title: | |
| 42 * Quick retrieval of advance values | |
| 43 * | |
| 44 * @abstract: | |
| 45 * Retrieve horizontal and vertical advance values without processing | |
| 46 * glyph outlines, if possible. | |
| 47 * | |
| 48 * @description: | |
| 49 * This section contains functions to quickly extract advance values | |
| 50 * without handling glyph outlines, if possible. | |
| 51 * | |
| 52 * @order: | |
| 53 * FT_Get_Advance | |
| 54 * FT_Get_Advances | |
| 55 * | |
| 56 */ | |
| 57 | |
| 58 | |
| 59 /*************************************************************************/ | |
| 60 /* */ | |
| 61 /* <Const> */ | |
| 62 /* FT_ADVANCE_FLAG_FAST_ONLY */ | |
| 63 /* */ | |
| 64 /* <Description> */ | |
| 65 /* A bit-flag to be OR-ed with the `flags' parameter of the */ | |
| 66 /* @FT_Get_Advance and @FT_Get_Advances functions. */ | |
| 67 /* */ | |
| 68 /* If set, it indicates that you want these functions to fail if the */ | |
| 69 /* corresponding hinting mode or font driver doesn't allow for very */ | |
| 70 /* quick advance computation. */ | |
| 71 /* */ | |
| 72 /* Typically, glyphs that are either unscaled, unhinted, bitmapped, */ | |
| 73 /* or light-hinted can have their advance width computed very */ | |
| 74 /* quickly. */ | |
| 75 /* */ | |
| 76 /* Normal and bytecode hinted modes that require loading, scaling, */ | |
| 77 /* and hinting of the glyph outline, are extremely slow by */ | |
| 78 /* comparison. */ | |
| 79 /* */ | |
| 80 #define FT_ADVANCE_FLAG_FAST_ONLY 0x20000000UL | |
| 81 | |
| 82 | |
| 83 /*************************************************************************/ | |
| 84 /* */ | |
| 85 /* <Function> */ | |
| 86 /* FT_Get_Advance */ | |
| 87 /* */ | |
| 88 /* <Description> */ | |
| 89 /* Retrieve the advance value of a given glyph outline in an */ | |
| 90 /* @FT_Face. */ | |
| 91 /* */ | |
| 92 /* <Input> */ | |
| 93 /* face :: The source @FT_Face handle. */ | |
| 94 /* */ | |
| 95 /* gindex :: The glyph index. */ | |
| 96 /* */ | |
| 97 /* load_flags :: A set of bit flags similar to those used when */ | |
| 98 /* calling @FT_Load_Glyph, used to determine what kind */ | |
| 99 /* of advances you need. */ | |
| 100 /* <Output> */ | |
| 101 /* padvance :: The advance value. If scaling is performed (based on */ | |
| 102 /* the value of `load_flags'), the advance value is in */ | |
| 103 /* 16.16 format. Otherwise, it is in font units. */ | |
| 104 /* */ | |
| 105 /* If @FT_LOAD_VERTICAL_LAYOUT is set, this is the */ | |
| 106 /* vertical advance corresponding to a vertical layout. */ | |
| 107 /* Otherwise, it is the horizontal advance in a */ | |
| 108 /* horizontal layout. */ | |
| 109 /* */ | |
| 110 /* <Return> */ | |
| 111 /* FreeType error code. 0 means success. */ | |
| 112 /* */ | |
| 113 /* <Note> */ | |
| 114 /* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */ | |
| 115 /* if the corresponding font backend doesn't have a quick way to */ | |
| 116 /* retrieve the advances. */ | |
| 117 /* */ | |
| 118 /* A scaled advance is returned in 16.16 format but isn't transformed */ | |
| 119 /* by the affine transformation specified by @FT_Set_Transform. */ | |
| 120 /* */ | |
| 121 FT_EXPORT( FT_Error ) | |
| 122 FT_Get_Advance( FT_Face face, | |
| 123 FT_UInt gindex, | |
| 124 FT_Int32 load_flags, | |
| 125 FT_Fixed *padvance ); | |
| 126 | |
| 127 | |
| 128 /*************************************************************************/ | |
| 129 /* */ | |
| 130 /* <Function> */ | |
| 131 /* FT_Get_Advances */ | |
| 132 /* */ | |
| 133 /* <Description> */ | |
| 134 /* Retrieve the advance values of several glyph outlines in an */ | |
| 135 /* @FT_Face. */ | |
| 136 /* */ | |
| 137 /* <Input> */ | |
| 138 /* face :: The source @FT_Face handle. */ | |
| 139 /* */ | |
| 140 /* start :: The first glyph index. */ | |
| 141 /* */ | |
| 142 /* count :: The number of advance values you want to retrieve. */ | |
| 143 /* */ | |
| 144 /* load_flags :: A set of bit flags similar to those used when */ | |
| 145 /* calling @FT_Load_Glyph. */ | |
| 146 /* */ | |
| 147 /* <Output> */ | |
| 148 /* padvance :: The advance values. This array, to be provided by the */ | |
| 149 /* caller, must contain at least `count' elements. */ | |
| 150 /* */ | |
| 151 /* If scaling is performed (based on the value of */ | |
| 152 /* `load_flags'), the advance values are in 16.16 format. */ | |
| 153 /* Otherwise, they are in font units. */ | |
| 154 /* */ | |
| 155 /* If @FT_LOAD_VERTICAL_LAYOUT is set, these are the */ | |
| 156 /* vertical advances corresponding to a vertical layout. */ | |
| 157 /* Otherwise, they are the horizontal advances in a */ | |
| 158 /* horizontal layout. */ | |
| 159 /* */ | |
| 160 /* <Return> */ | |
| 161 /* FreeType error code. 0 means success. */ | |
| 162 /* */ | |
| 163 /* <Note> */ | |
| 164 /* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */ | |
| 165 /* if the corresponding font backend doesn't have a quick way to */ | |
| 166 /* retrieve the advances. */ | |
| 167 /* */ | |
| 168 /* Scaled advances are returned in 16.16 format but aren't */ | |
| 169 /* transformed by the affine transformation specified by */ | |
| 170 /* @FT_Set_Transform. */ | |
| 171 /* */ | |
| 172 FT_EXPORT( FT_Error ) | |
| 173 FT_Get_Advances( FT_Face face, | |
| 174 FT_UInt start, | |
| 175 FT_UInt count, | |
| 176 FT_Int32 load_flags, | |
| 177 FT_Fixed *padvances ); | |
| 178 | |
| 179 /* */ | |
| 180 | |
| 181 | |
| 182 FT_END_HEADER | |
| 183 | |
| 184 #endif /* __FTADVANC_H__ */ | |
| 185 | |
| 186 | |
| 187 /* END */ | |
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Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master