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annotate freetype2/freetype/ftincrem.h @ 1407:976f7b77f0bf draft

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fix Makefile
author Daichi TOMA <toma@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Feb 2012 17:42:50 +0900
parents a8ab91f49cac
children
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1 /***************************************************************************/
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2 /* */
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3 /* ftincrem.h */
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4 /* */
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5 /* FreeType incremental loading (specification). */
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6 /* */
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7 /* Copyright 2002, 2003, 2006, 2007, 2008, 2010 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 __FTINCREM_H__
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20 #define __FTINCREM_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 * @section:
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37 * incremental
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38 *
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39 * @title:
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40 * Incremental Loading
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41 *
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42 * @abstract:
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43 * Custom Glyph Loading.
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44 *
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45 * @description:
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46 * This section contains various functions used to perform so-called
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47 * `incremental' glyph loading. This is a mode where all glyphs loaded
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48 * from a given @FT_Face are provided by the client application,
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49 *
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50 * Apart from that, all other tables are loaded normally from the font
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51 * file. This mode is useful when FreeType is used within another
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52 * engine, e.g., a PostScript Imaging Processor.
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53 *
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54 * To enable this mode, you must use @FT_Open_Face, passing an
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55 * @FT_Parameter with the @FT_PARAM_TAG_INCREMENTAL tag and an
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56 * @FT_Incremental_Interface value. See the comments for
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57 * @FT_Incremental_InterfaceRec for an example.
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58 *
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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 * @type:
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65 * FT_Incremental
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66 *
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67 * @description:
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68 * An opaque type describing a user-provided object used to implement
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69 * `incremental' glyph loading within FreeType. This is used to support
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70 * embedded fonts in certain environments (e.g., PostScript interpreters),
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71 * where the glyph data isn't in the font file, or must be overridden by
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72 * different values.
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73 *
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74 * @note:
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75 * It is up to client applications to create and implement @FT_Incremental
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76 * objects, as long as they provide implementations for the methods
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77 * @FT_Incremental_GetGlyphDataFunc, @FT_Incremental_FreeGlyphDataFunc
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78 * and @FT_Incremental_GetGlyphMetricsFunc.
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79 *
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80 * See the description of @FT_Incremental_InterfaceRec to understand how
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81 * to use incremental objects with FreeType.
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82 *
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83 */
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84 typedef struct FT_IncrementalRec_* FT_Incremental;
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85
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86
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87 /***************************************************************************
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88 *
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89 * @struct:
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90 * FT_Incremental_MetricsRec
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91 *
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92 * @description:
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93 * A small structure used to contain the basic glyph metrics returned
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94 * by the @FT_Incremental_GetGlyphMetricsFunc method.
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95 *
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96 * @fields:
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97 * bearing_x ::
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98 * Left bearing, in font units.
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99 *
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100 * bearing_y ::
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101 * Top bearing, in font units.
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102 *
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103 * advance ::
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104 * Horizontal component of glyph advance, in font units.
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105 *
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106 * advance_v ::
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107 * Vertical component of glyph advance, in font units.
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108 *
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109 * @note:
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110 * These correspond to horizontal or vertical metrics depending on the
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111 * value of the `vertical' argument to the function
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112 * @FT_Incremental_GetGlyphMetricsFunc.
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113 *
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114 */
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115 typedef struct FT_Incremental_MetricsRec_
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116 {
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117 FT_Long bearing_x;
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118 FT_Long bearing_y;
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119 FT_Long advance;
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120 FT_Long advance_v; /* since 2.3.12 */
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121
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122 } FT_Incremental_MetricsRec;
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123
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124
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125 /***************************************************************************
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126 *
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127 * @struct:
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128 * FT_Incremental_Metrics
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129 *
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130 * @description:
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131 * A handle to an @FT_Incremental_MetricsRec structure.
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132 *
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133 */
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134 typedef struct FT_Incremental_MetricsRec_* FT_Incremental_Metrics;
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135
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136
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137 /***************************************************************************
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138 *
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139 * @type:
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140 * FT_Incremental_GetGlyphDataFunc
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141 *
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142 * @description:
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143 * A function called by FreeType to access a given glyph's data bytes
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144 * during @FT_Load_Glyph or @FT_Load_Char if incremental loading is
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145 * enabled.
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146 *
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147 * Note that the format of the glyph's data bytes depends on the font
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148 * file format. For TrueType, it must correspond to the raw bytes within
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149 * the `glyf' table. For PostScript formats, it must correspond to the
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150 * *unencrypted* charstring bytes, without any `lenIV' header. It is
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151 * undefined for any other format.
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152 *
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153 * @input:
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154 * incremental ::
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155 * Handle to an opaque @FT_Incremental handle provided by the client
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156 * application.
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157 *
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158 * glyph_index ::
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159 * Index of relevant glyph.
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160 *
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161 * @output:
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162 * adata ::
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163 * A structure describing the returned glyph data bytes (which will be
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164 * accessed as a read-only byte block).
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165 *
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166 * @return:
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167 * FreeType error code. 0~means success.
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168 *
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169 * @note:
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170 * If this function returns successfully the method
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171 * @FT_Incremental_FreeGlyphDataFunc will be called later to release
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172 * the data bytes.
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173 *
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174 * Nested calls to @FT_Incremental_GetGlyphDataFunc can happen for
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175 * compound glyphs.
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176 *
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177 */
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178 typedef FT_Error
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179 (*FT_Incremental_GetGlyphDataFunc)( FT_Incremental incremental,
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180 FT_UInt glyph_index,
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181 FT_Data* adata );
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182
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183
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184 /***************************************************************************
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185 *
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186 * @type:
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187 * FT_Incremental_FreeGlyphDataFunc
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188 *
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189 * @description:
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190 * A function used to release the glyph data bytes returned by a
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191 * successful call to @FT_Incremental_GetGlyphDataFunc.
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192 *
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193 * @input:
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194 * incremental ::
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195 * A handle to an opaque @FT_Incremental handle provided by the client
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196 * application.
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197 *
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198 * data ::
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199 * A structure describing the glyph data bytes (which will be accessed
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200 * as a read-only byte block).
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201 *
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202 */
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203 typedef void
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204 (*FT_Incremental_FreeGlyphDataFunc)( FT_Incremental incremental,
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205 FT_Data* data );
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206
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207
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208 /***************************************************************************
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209 *
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210 * @type:
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211 * FT_Incremental_GetGlyphMetricsFunc
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212 *
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213 * @description:
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214 * A function used to retrieve the basic metrics of a given glyph index
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215 * before accessing its data. This is necessary because, in certain
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216 * formats like TrueType, the metrics are stored in a different place from
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217 * the glyph images proper.
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218 *
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219 * @input:
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220 * incremental ::
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221 * A handle to an opaque @FT_Incremental handle provided by the client
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222 * application.
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223 *
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224 * glyph_index ::
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225 * Index of relevant glyph.
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226 *
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227 * vertical ::
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228 * If true, return vertical metrics.
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229 *
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230 * ametrics ::
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231 * This parameter is used for both input and output.
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232 * The original glyph metrics, if any, in font units. If metrics are
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233 * not available all the values must be set to zero.
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234 *
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235 * @output:
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236 * ametrics ::
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237 * The replacement glyph metrics in font units.
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238 *
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239 */
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240 typedef FT_Error
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241 (*FT_Incremental_GetGlyphMetricsFunc)
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242 ( FT_Incremental incremental,
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243 FT_UInt glyph_index,
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244 FT_Bool vertical,
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245 FT_Incremental_MetricsRec *ametrics );
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246
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247
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248 /**************************************************************************
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249 *
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250 * @struct:
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251 * FT_Incremental_FuncsRec
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252 *
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253 * @description:
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254 * A table of functions for accessing fonts that load data
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255 * incrementally. Used in @FT_Incremental_InterfaceRec.
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256 *
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257 * @fields:
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258 * get_glyph_data ::
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259 * The function to get glyph data. Must not be null.
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260 *
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261 * free_glyph_data ::
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262 * The function to release glyph data. Must not be null.
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263 *
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264 * get_glyph_metrics ::
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265 * The function to get glyph metrics. May be null if the font does
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266 * not provide overriding glyph metrics.
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267 *
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268 */
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269 typedef struct FT_Incremental_FuncsRec_
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270 {
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271 FT_Incremental_GetGlyphDataFunc get_glyph_data;
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272 FT_Incremental_FreeGlyphDataFunc free_glyph_data;
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273 FT_Incremental_GetGlyphMetricsFunc get_glyph_metrics;
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274
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275 } FT_Incremental_FuncsRec;
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276
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277
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278 /***************************************************************************
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279 *
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280 * @struct:
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281 * FT_Incremental_InterfaceRec
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282 *
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283 * @description:
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284 * A structure to be used with @FT_Open_Face to indicate that the user
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285 * wants to support incremental glyph loading. You should use it with
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286 * @FT_PARAM_TAG_INCREMENTAL as in the following example:
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287 *
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288 * {
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289 * FT_Incremental_InterfaceRec inc_int;
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290 * FT_Parameter parameter;
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291 * FT_Open_Args open_args;
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292 *
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293 *
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294 * // set up incremental descriptor
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295 * inc_int.funcs = my_funcs;
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296 * inc_int.object = my_object;
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297 *
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298 * // set up optional parameter
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299 * parameter.tag = FT_PARAM_TAG_INCREMENTAL;
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300 * parameter.data = &inc_int;
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301 *
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302 * // set up FT_Open_Args structure
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303 * open_args.flags = FT_OPEN_PATHNAME | FT_OPEN_PARAMS;
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304 * open_args.pathname = my_font_pathname;
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305 * open_args.num_params = 1;
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306 * open_args.params = &parameter; // we use one optional argument
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307 *
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308 * // open the font
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309 * error = FT_Open_Face( library, &open_args, index, &face );
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310 * ...
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311 * }
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312 *
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313 */
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314 typedef struct FT_Incremental_InterfaceRec_
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315 {
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316 const FT_Incremental_FuncsRec* funcs;
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317 FT_Incremental object;
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318
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319 } FT_Incremental_InterfaceRec;
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320
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321
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322 /***************************************************************************
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323 *
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324 * @type:
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325 * FT_Incremental_Interface
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326 *
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327 * @description:
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328 * A pointer to an @FT_Incremental_InterfaceRec structure.
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329 *
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330 */
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331 typedef FT_Incremental_InterfaceRec* FT_Incremental_Interface;
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332
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333
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334 /***************************************************************************
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335 *
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336 * @constant:
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337 * FT_PARAM_TAG_INCREMENTAL
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338 *
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339 * @description:
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340 * A constant used as the tag of @FT_Parameter structures to indicate
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341 * an incremental loading object to be used by FreeType.
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342 *
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343 */
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344 #define FT_PARAM_TAG_INCREMENTAL FT_MAKE_TAG( 'i', 'n', 'c', 'r' )
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345
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346 /* */
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347
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348 FT_END_HEADER
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349
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350 #endif /* __FTINCREM_H__ */
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351
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352
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353 /* END */