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annotate freetype2/freetype/ftgxval.h @ 1478:beda5f2f88ce draft

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remove singleton
author Yuhi TOMARI <yuhi@cr.ie.u-ryukyu.ac.jp>
date Fri, 20 Jul 2012 05:47:14 +0900
parents a8ab91f49cac
children
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1 /***************************************************************************/
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2 /* */
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3 /* ftgxval.h */
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4 /* */
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5 /* FreeType API for validating TrueTypeGX/AAT tables (specification). */
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6 /* */
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7 /* Copyright 2004, 2005, 2006 by */
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8 /* Masatake YAMATO, Redhat K.K, */
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9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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10 /* */
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11 /* This file is part of the FreeType project, and may only be used, */
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12 /* modified, and distributed under the terms of the FreeType project */
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13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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14 /* this file you indicate that you have read the license and */
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15 /* understand and accept it fully. */
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16 /* */
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17 /***************************************************************************/
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18
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19 /***************************************************************************/
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20 /* */
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21 /* gxvalid is derived from both gxlayout module and otvalid module. */
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22 /* Development of gxlayout is supported by the Information-technology */
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23 /* Promotion Agency(IPA), Japan. */
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24 /* */
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25 /***************************************************************************/
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26
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27
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28 #ifndef __FTGXVAL_H__
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29 #define __FTGXVAL_H__
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30
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31 #include <ft2build.h>
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32 #include FT_FREETYPE_H
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33
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34 #ifdef FREETYPE_H
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35 #error "freetype.h of FreeType 1 has been loaded!"
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36 #error "Please fix the directory search order for header files"
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37 #error "so that freetype.h of FreeType 2 is found first."
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38 #endif
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39
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40
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41 FT_BEGIN_HEADER
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42
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43
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44 /*************************************************************************/
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45 /* */
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46 /* <Section> */
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47 /* gx_validation */
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48 /* */
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49 /* <Title> */
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50 /* TrueTypeGX/AAT Validation */
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51 /* */
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52 /* <Abstract> */
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53 /* An API to validate TrueTypeGX/AAT tables. */
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54 /* */
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55 /* <Description> */
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56 /* This section contains the declaration of functions to validate */
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57 /* some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, */
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58 /* trak, prop, lcar). */
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59 /* */
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60 /*************************************************************************/
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61
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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 /* Warning: Use FT_VALIDATE_XXX to validate a table. */
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67 /* Following definitions are for gxvalid developers. */
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68 /* */
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69 /* */
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70 /*************************************************************************/
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71
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72 #define FT_VALIDATE_feat_INDEX 0
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73 #define FT_VALIDATE_mort_INDEX 1
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74 #define FT_VALIDATE_morx_INDEX 2
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75 #define FT_VALIDATE_bsln_INDEX 3
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76 #define FT_VALIDATE_just_INDEX 4
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77 #define FT_VALIDATE_kern_INDEX 5
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78 #define FT_VALIDATE_opbd_INDEX 6
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79 #define FT_VALIDATE_trak_INDEX 7
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80 #define FT_VALIDATE_prop_INDEX 8
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81 #define FT_VALIDATE_lcar_INDEX 9
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82 #define FT_VALIDATE_GX_LAST_INDEX FT_VALIDATE_lcar_INDEX
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83
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84
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85 /*************************************************************************
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86 *
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87 * @macro:
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88 * FT_VALIDATE_GX_LENGTH
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89 *
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90 * @description:
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91 * The number of tables checked in this module. Use it as a parameter
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92 * for the `table-length' argument of function @FT_TrueTypeGX_Validate.
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93 */
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94 #define FT_VALIDATE_GX_LENGTH (FT_VALIDATE_GX_LAST_INDEX + 1)
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95
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96 /* */
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97
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98 /* Up to 0x1000 is used by otvalid.
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99 Ox2xxx is reserved for feature OT extension. */
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100 #define FT_VALIDATE_GX_START 0x4000
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101 #define FT_VALIDATE_GX_BITFIELD( tag ) \
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102 ( FT_VALIDATE_GX_START << FT_VALIDATE_##tag##_INDEX )
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103
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104
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105 /**********************************************************************
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106 *
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107 * @enum:
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108 * FT_VALIDATE_GXXXX
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109 *
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110 * @description:
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111 * A list of bit-field constants used with @FT_TrueTypeGX_Validate to
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112 * indicate which TrueTypeGX/AAT Type tables should be validated.
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113 *
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114 * @values:
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115 * FT_VALIDATE_feat ::
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116 * Validate `feat' table.
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117 *
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118 * FT_VALIDATE_mort ::
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119 * Validate `mort' table.
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120 *
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121 * FT_VALIDATE_morx ::
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122 * Validate `morx' table.
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123 *
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124 * FT_VALIDATE_bsln ::
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diff changeset
125 * Validate `bsln' table.
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126 *
a8ab91f49cac add freetype2,ft2build.h
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diff changeset
127 * FT_VALIDATE_just ::
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diff changeset
128 * Validate `just' table.
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129 *
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130 * FT_VALIDATE_kern ::
a8ab91f49cac add freetype2,ft2build.h
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diff changeset
131 * Validate `kern' table.
a8ab91f49cac add freetype2,ft2build.h
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132 *
a8ab91f49cac add freetype2,ft2build.h
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133 * FT_VALIDATE_opbd ::
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diff changeset
134 * Validate `opbd' table.
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135 *
a8ab91f49cac add freetype2,ft2build.h
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136 * FT_VALIDATE_trak ::
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137 * Validate `trak' table.
a8ab91f49cac add freetype2,ft2build.h
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138 *
a8ab91f49cac add freetype2,ft2build.h
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diff changeset
139 * FT_VALIDATE_prop ::
a8ab91f49cac add freetype2,ft2build.h
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diff changeset
140 * Validate `prop' table.
a8ab91f49cac add freetype2,ft2build.h
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141 *
a8ab91f49cac add freetype2,ft2build.h
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142 * FT_VALIDATE_lcar ::
a8ab91f49cac add freetype2,ft2build.h
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diff changeset
143 * Validate `lcar' table.
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144 *
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145 * FT_VALIDATE_GX ::
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diff changeset
146 * Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern,
a8ab91f49cac add freetype2,ft2build.h
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147 * opbd, trak, prop and lcar).
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148 *
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149 */
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150
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151 #define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat )
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152 #define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort )
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153 #define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx )
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154 #define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln )
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155 #define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just )
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156 #define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern )
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157 #define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd )
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158 #define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak )
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159 #define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop )
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160 #define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar )
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161
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162 #define FT_VALIDATE_GX ( FT_VALIDATE_feat | \
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163 FT_VALIDATE_mort | \
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164 FT_VALIDATE_morx | \
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165 FT_VALIDATE_bsln | \
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166 FT_VALIDATE_just | \
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167 FT_VALIDATE_kern | \
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168 FT_VALIDATE_opbd | \
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169 FT_VALIDATE_trak | \
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170 FT_VALIDATE_prop | \
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171 FT_VALIDATE_lcar )
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172
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173
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174 /* */
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175
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176 /**********************************************************************
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177 *
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178 * @function:
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179 * FT_TrueTypeGX_Validate
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180 *
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181 * @description:
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182 * Validate various TrueTypeGX tables to assure that all offsets and
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183 * indices are valid. The idea is that a higher-level library which
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184 * actually does the text layout can access those tables without
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185 * error checking (which can be quite time consuming).
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186 *
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187 * @input:
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188 * face ::
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189 * A handle to the input face.
a8ab91f49cac add freetype2,ft2build.h
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190 *
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191 * validation_flags ::
a8ab91f49cac add freetype2,ft2build.h
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192 * A bit field which specifies the tables to be validated. See
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193 * @FT_VALIDATE_GXXXX for possible values.
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194 *
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195 * table_length ::
a8ab91f49cac add freetype2,ft2build.h
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196 * The size of the `tables' array. Normally, @FT_VALIDATE_GX_LENGTH
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197 * should be passed.
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198 *
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199 * @output:
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200 * tables ::
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201 * The array where all validated sfnt tables are stored.
a8ab91f49cac add freetype2,ft2build.h
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202 * The array itself must be allocated by a client.
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203 *
a8ab91f49cac add freetype2,ft2build.h
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204 * @return:
a8ab91f49cac add freetype2,ft2build.h
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205 * FreeType error code. 0~means success.
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206 *
a8ab91f49cac add freetype2,ft2build.h
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207 * @note:
a8ab91f49cac add freetype2,ft2build.h
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208 * This function only works with TrueTypeGX fonts, returning an error
a8ab91f49cac add freetype2,ft2build.h
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209 * otherwise.
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210 *
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211 * After use, the application should deallocate the buffers pointed to by
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212 * each `tables' element, by calling @FT_TrueTypeGX_Free. A NULL value
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213 * indicates that the table either doesn't exist in the font, the
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214 * application hasn't asked for validation, or the validator doesn't have
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215 * the ability to validate the sfnt table.
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216 */
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217 FT_EXPORT( FT_Error )
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218 FT_TrueTypeGX_Validate( FT_Face face,
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219 FT_UInt validation_flags,
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220 FT_Bytes tables[FT_VALIDATE_GX_LENGTH],
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221 FT_UInt table_length );
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222
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223
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224 /* */
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225
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226 /**********************************************************************
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227 *
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228 * @function:
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229 * FT_TrueTypeGX_Free
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230 *
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231 * @description:
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232 * Free the buffer allocated by TrueTypeGX validator.
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233 *
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234 * @input:
a8ab91f49cac add freetype2,ft2build.h
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235 * face ::
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236 * A handle to the input face.
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237 *
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238 * table ::
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239 * The pointer to the buffer allocated by
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240 * @FT_TrueTypeGX_Validate.
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241 *
a8ab91f49cac add freetype2,ft2build.h
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242 * @note:
a8ab91f49cac add freetype2,ft2build.h
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243 * This function must be used to free the buffer allocated by
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244 * @FT_TrueTypeGX_Validate only.
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245 */
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246 FT_EXPORT( void )
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247 FT_TrueTypeGX_Free( FT_Face face,
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248 FT_Bytes table );
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249
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250
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251 /* */
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252
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253 /**********************************************************************
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254 *
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255 * @enum:
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256 * FT_VALIDATE_CKERNXXX
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257 *
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258 * @description:
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259 * A list of bit-field constants used with @FT_ClassicKern_Validate
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260 * to indicate the classic kern dialect or dialects. If the selected
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261 * type doesn't fit, @FT_ClassicKern_Validate regards the table as
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262 * invalid.
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263 *
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264 * @values:
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265 * FT_VALIDATE_MS ::
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266 * Handle the `kern' table as a classic Microsoft kern table.
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267 *
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268 * FT_VALIDATE_APPLE ::
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269 * Handle the `kern' table as a classic Apple kern table.
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270 *
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271 * FT_VALIDATE_CKERN ::
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272 * Handle the `kern' as either classic Apple or Microsoft kern table.
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273 */
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274 #define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 )
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275 #define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 )
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276
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277 #define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
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278
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279
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280 /* */
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281
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282 /**********************************************************************
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283 *
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284 * @function:
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285 * FT_ClassicKern_Validate
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286 *
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287 * @description:
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288 * Validate classic (16-bit format) kern table to assure that the offsets
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289 * and indices are valid. The idea is that a higher-level library which
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290 * actually does the text layout can access those tables without error
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291 * checking (which can be quite time consuming).
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292 *
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293 * The `kern' table validator in @FT_TrueTypeGX_Validate deals with both
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294 * the new 32-bit format and the classic 16-bit format, while
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295 * FT_ClassicKern_Validate only supports the classic 16-bit format.
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296 *
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297 * @input:
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298 * face ::
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299 * A handle to the input face.
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300 *
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301 * validation_flags ::
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302 * A bit field which specifies the dialect to be validated. See
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303 * @FT_VALIDATE_CKERNXXX for possible values.
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304 *
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305 * @output:
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306 * ckern_table ::
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307 * A pointer to the kern table.
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308 *
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309 * @return:
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310 * FreeType error code. 0~means success.
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311 *
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312 * @note:
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313 * After use, the application should deallocate the buffers pointed to by
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314 * `ckern_table', by calling @FT_ClassicKern_Free. A NULL value
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315 * indicates that the table doesn't exist in the font.
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316 */
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317 FT_EXPORT( FT_Error )
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318 FT_ClassicKern_Validate( FT_Face face,
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319 FT_UInt validation_flags,
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320 FT_Bytes *ckern_table );
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321
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322
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323 /* */
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324
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325 /**********************************************************************
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326 *
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327 * @function:
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328 * FT_ClassicKern_Free
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329 *
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330 * @description:
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331 * Free the buffer allocated by classic Kern validator.
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332 *
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333 * @input:
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334 * face ::
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335 * A handle to the input face.
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336 *
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337 * table ::
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338 * The pointer to the buffer that is allocated by
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339 * @FT_ClassicKern_Validate.
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340 *
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341 * @note:
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342 * This function must be used to free the buffer allocated by
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343 * @FT_ClassicKern_Validate only.
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344 */
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345 FT_EXPORT( void )
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346 FT_ClassicKern_Free( FT_Face face,
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347 FT_Bytes table );
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348
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349
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350 /* */
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351
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352
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353 FT_END_HEADER
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354
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355 #endif /* __FTGXVAL_H__ */
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356
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357
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358 /* END */