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annotate freetype2/freetype/ftpfr.h @ 1299:f0e805c09ed6 draft

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minor fix xml_walk and pickup_float, not work yet.
author Yutaka_Kinjyo <yutaka@cr.ie.u-ryukyu.ac.jp>
date Sun, 04 Dec 2011 18:50:53 +0900
parents a8ab91f49cac
children
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1 /***************************************************************************/
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2 /* */
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3 /* ftpfr.h */
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4 /* */
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5 /* FreeType API for accessing PFR-specific data (specification only). */
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6 /* */
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7 /* Copyright 2002, 2003, 2004, 2006, 2008, 2009 by */
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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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 __FTPFR_H__
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20 #define __FTPFR_H__
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21
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22 #include <ft2build.h>
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23 #include FT_FREETYPE_H
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24
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25 #ifdef FREETYPE_H
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26 #error "freetype.h of FreeType 1 has been loaded!"
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27 #error "Please fix the directory search order for header files"
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28 #error "so that freetype.h of FreeType 2 is found first."
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29 #endif
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30
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31
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32 FT_BEGIN_HEADER
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33
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34
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35 /*************************************************************************/
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36 /* */
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37 /* <Section> */
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38 /* pfr_fonts */
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39 /* */
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40 /* <Title> */
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41 /* PFR Fonts */
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42 /* */
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43 /* <Abstract> */
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44 /* PFR/TrueDoc specific API. */
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45 /* */
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46 /* <Description> */
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47 /* This section contains the declaration of PFR-specific functions. */
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48 /* */
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49 /*************************************************************************/
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50
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51
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52 /**********************************************************************
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53 *
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54 * @function:
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55 * FT_Get_PFR_Metrics
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56 *
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57 * @description:
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58 * Return the outline and metrics resolutions of a given PFR face.
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59 *
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60 * @input:
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61 * face :: Handle to the input face. It can be a non-PFR face.
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62 *
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63 * @output:
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64 * aoutline_resolution ::
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65 * Outline resolution. This is equivalent to `face->units_per_EM'
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66 * for non-PFR fonts. Optional (parameter can be NULL).
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67 *
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68 * ametrics_resolution ::
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69 * Metrics resolution. This is equivalent to `outline_resolution'
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70 * for non-PFR fonts. Optional (parameter can be NULL).
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71 *
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72 * ametrics_x_scale ::
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73 * A 16.16 fixed-point number used to scale distance expressed
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74 * in metrics units to device sub-pixels. This is equivalent to
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75 * `face->size->x_scale', but for metrics only. Optional (parameter
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76 * can be NULL).
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77 *
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78 * ametrics_y_scale ::
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79 * Same as `ametrics_x_scale' but for the vertical direction.
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80 * optional (parameter can be NULL).
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81 *
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82 * @return:
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83 * FreeType error code. 0~means success.
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84 *
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85 * @note:
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86 * If the input face is not a PFR, this function will return an error.
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87 * However, in all cases, it will return valid values.
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88 */
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89 FT_EXPORT( FT_Error )
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90 FT_Get_PFR_Metrics( FT_Face face,
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91 FT_UInt *aoutline_resolution,
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92 FT_UInt *ametrics_resolution,
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93 FT_Fixed *ametrics_x_scale,
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94 FT_Fixed *ametrics_y_scale );
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95
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96
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97 /**********************************************************************
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98 *
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99 * @function:
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100 * FT_Get_PFR_Kerning
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101 *
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102 * @description:
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103 * Return the kerning pair corresponding to two glyphs in a PFR face.
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104 * The distance is expressed in metrics units, unlike the result of
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105 * @FT_Get_Kerning.
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106 *
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107 * @input:
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108 * face :: A handle to the input face.
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109 *
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110 * left :: Index of the left glyph.
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111 *
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112 * right :: Index of the right glyph.
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113 *
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114 * @output:
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115 * avector :: A kerning vector.
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116 *
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117 * @return:
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118 * FreeType error code. 0~means success.
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119 *
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120 * @note:
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121 * This function always return distances in original PFR metrics
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122 * units. This is unlike @FT_Get_Kerning with the @FT_KERNING_UNSCALED
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123 * mode, which always returns distances converted to outline units.
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124 *
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125 * You can use the value of the `x_scale' and `y_scale' parameters
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126 * returned by @FT_Get_PFR_Metrics to scale these to device sub-pixels.
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127 */
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128 FT_EXPORT( FT_Error )
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129 FT_Get_PFR_Kerning( FT_Face face,
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130 FT_UInt left,
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131 FT_UInt right,
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132 FT_Vector *avector );
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133
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134
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135 /**********************************************************************
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136 *
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137 * @function:
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138 * FT_Get_PFR_Advance
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139 *
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140 * @description:
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141 * Return a given glyph advance, expressed in original metrics units,
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142 * from a PFR font.
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143 *
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144 * @input:
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145 * face :: A handle to the input face.
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146 *
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147 * gindex :: The glyph index.
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148 *
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149 * @output:
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150 * aadvance :: The glyph advance in metrics units.
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151 *
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152 * @return:
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153 * FreeType error code. 0~means success.
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154 *
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155 * @note:
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156 * You can use the `x_scale' or `y_scale' results of @FT_Get_PFR_Metrics
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157 * to convert the advance to device sub-pixels (i.e., 1/64th of pixels).
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158 */
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159 FT_EXPORT( FT_Error )
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160 FT_Get_PFR_Advance( FT_Face face,
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161 FT_UInt gindex,
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162 FT_Pos *aadvance );
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163
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164 /* */
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165
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166
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167 FT_END_HEADER
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168
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169 #endif /* __FTPFR_H__ */
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170
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171
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172 /* END */