1 | /***************************************************************************/
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2 | /* */
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3 | /* sfnt.h */
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4 | /* */
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5 | /* High-level `sfnt' driver interface (specification). */
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6 | /* */
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7 | /* Copyright 1996-2001, 2002, 2003, 2004, 2005 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 __SFNT_H__
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20 | #define __SFNT_H__
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21 |
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22 |
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23 | #include <ft2build.h>
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24 | #include FT_INTERNAL_DRIVER_H
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25 | #include FT_INTERNAL_TRUETYPE_TYPES_H
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26 |
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27 |
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28 | FT_BEGIN_HEADER
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29 |
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30 |
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31 | /*************************************************************************/
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32 | /* */
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33 | /* <FuncType> */
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34 | /* TT_Init_Face_Func */
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35 | /* */
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36 | /* <Description> */
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37 | /* First part of the SFNT face object initialization. This will find */
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38 | /* the face in a SFNT file or collection, and load its format tag in */
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39 | /* face->format_tag. */
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40 | /* */
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41 | /* <Input> */
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42 | /* stream :: The input stream. */
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43 | /* */
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44 | /* face :: A handle to the target face object. */
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45 | /* */
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46 | /* face_index :: The index of the TrueType font, if we are opening a */
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47 | /* collection. */
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48 | /* */
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49 | /* num_params :: The number of additional parameters. */
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50 | /* */
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51 | /* params :: Optional additional parameters. */
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52 | /* */
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53 | /* <Return> */
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54 | /* FreeType error code. 0 means success. */
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55 | /* */
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56 | /* <Note> */
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57 | /* The stream cursor must be at the font file's origin. */
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58 | /* */
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59 | /* This function recognizes fonts embedded in a `TrueType */
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60 | /* collection'. */
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61 | /* */
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62 | /* Once the format tag has been validated by the font driver, it */
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63 | /* should then call the TT_Load_Face_Func() callback to read the rest */
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64 | /* of the SFNT tables in the object. */
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65 | /* */
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66 | typedef FT_Error
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67 | (*TT_Init_Face_Func)( FT_Stream stream,
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68 | TT_Face face,
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69 | FT_Int face_index,
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70 | FT_Int num_params,
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71 | FT_Parameter* params );
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72 |
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73 |
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74 | /*************************************************************************/
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75 | /* */
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76 | /* <FuncType> */
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77 | /* TT_Load_Face_Func */
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78 | /* */
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79 | /* <Description> */
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80 | /* Second part of the SFNT face object initialization. This will */
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81 | /* load the common SFNT tables (head, OS/2, maxp, metrics, etc.) in */
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82 | /* the face object. */
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83 | /* */
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84 | /* <Input> */
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85 | /* stream :: The input stream. */
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86 | /* */
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87 | /* face :: A handle to the target face object. */
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88 | /* */
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89 | /* face_index :: The index of the TrueType font, if we are opening a */
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90 | /* collection. */
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91 | /* */
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92 | /* num_params :: The number of additional parameters. */
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93 | /* */
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94 | /* params :: Optional additional parameters. */
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95 | /* */
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96 | /* <Return> */
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97 | /* FreeType error code. 0 means success. */
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98 | /* */
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99 | /* <Note> */
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100 | /* This function must be called after TT_Init_Face_Func(). */
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101 | /* */
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102 | typedef FT_Error
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103 | (*TT_Load_Face_Func)( FT_Stream stream,
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104 | TT_Face face,
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105 | FT_Int face_index,
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106 | FT_Int num_params,
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107 | FT_Parameter* params );
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108 |
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109 |
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110 | /*************************************************************************/
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111 | /* */
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112 | /* <FuncType> */
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113 | /* TT_Done_Face_Func */
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114 | /* */
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115 | /* <Description> */
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116 | /* A callback used to delete the common SFNT data from a face. */
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117 | /* */
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118 | /* <Input> */
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119 | /* face :: A handle to the target face object. */
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120 | /* */
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121 | /* <Note> */
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122 | /* This function does NOT destroy the face object. */
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123 | /* */
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124 | typedef void
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125 | (*TT_Done_Face_Func)( TT_Face face );
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126 |
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127 |
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128 | /*************************************************************************/
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129 | /* */
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130 | /* <FuncType> */
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131 | /* TT_Load_SFNT_HeaderRec_Func */
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132 | /* */
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133 | /* <Description> */
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134 | /* Loads the header of a SFNT font file. Supports collections. */
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135 | /* */
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136 | /* <Input> */
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137 | /* face :: A handle to the target face object. */
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138 | /* */
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139 | /* stream :: The input stream. */
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140 | /* */
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141 | /* face_index :: The index of the TrueType font, if we are opening a */
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142 | /* collection. */
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143 | /* */
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144 | /* <Output> */
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145 | /* sfnt :: The SFNT header. */
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146 | /* */
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147 | /* <Return> */
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148 | /* FreeType error code. 0 means success. */
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149 | /* */
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150 | /* <Note> */
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151 | /* The stream cursor must be at the font file's origin. */
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152 | /* */
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153 | /* This function recognizes fonts embedded in a `TrueType */
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154 | /* collection'. */
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155 | /* */
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156 | /* This function checks that the header is valid by looking at the */
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157 | /* values of `search_range', `entry_selector', and `range_shift'. */
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158 | /* */
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159 | typedef FT_Error
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160 | (*TT_Load_SFNT_HeaderRec_Func)( TT_Face face,
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161 | FT_Stream stream,
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162 | FT_Long face_index,
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163 | SFNT_Header sfnt );
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164 |
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165 |
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166 | /*************************************************************************/
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167 | /* */
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168 | /* <FuncType> */
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169 | /* TT_Load_Directory_Func */
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170 | /* */
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171 | /* <Description> */
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172 | /* Loads the table directory into a face object. */
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173 | /* */
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174 | /* <Input> */
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175 | /* face :: A handle to the target face object. */
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176 | /* */
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177 | /* stream :: The input stream. */
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178 | /* */
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179 | /* sfnt :: The SFNT header. */
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180 | /* */
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181 | /* <Return> */
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182 | /* FreeType error code. 0 means success. */
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183 | /* */
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184 | /* <Note> */
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185 | /* The stream cursor must be on the first byte after the 4-byte font */
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186 | /* format tag. This is the case just after a call to */
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187 | /* TT_Load_Format_Tag(). */
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188 | /* */
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189 | typedef FT_Error
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190 | (*TT_Load_Directory_Func)( TT_Face face,
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191 | FT_Stream stream,
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192 | SFNT_Header sfnt );
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193 |
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194 |
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195 | /*************************************************************************/
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196 | /* */
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197 | /* <FuncType> */
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198 | /* TT_Load_Any_Func */
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199 | /* */
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200 | /* <Description> */
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201 | /* Loads any font table into client memory. */
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202 | /* */
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203 | /* <Input> */
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204 | /* face :: The face object to look for. */
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205 | /* */
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206 | /* tag :: The tag of table to load. Use the value 0 if you want */
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207 | /* to access the whole font file, else set this parameter */
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208 | /* to a valid TrueType table tag that you can forge with */
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209 | /* the MAKE_TT_TAG macro. */
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210 | /* */
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211 | /* offset :: The starting offset in the table (or the file if */
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212 | /* tag == 0). */
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213 | /* */
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214 | /* length :: The address of the decision variable: */
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215 | /* */
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216 | /* If length == NULL: */
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217 | /* Loads the whole table. Returns an error if */
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218 | /* `offset' == 0! */
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219 | /* */
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220 | /* If *length == 0: */
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221 | /* Exits immediately; returning the length of the given */
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222 | /* table or of the font file, depending on the value of */
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223 | /* `tag'. */
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224 | /* */
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225 | /* If *length != 0: */
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226 | /* Loads the next `length' bytes of table or font, */
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227 | /* starting at offset `offset' (in table or font too). */
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228 | /* */
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229 | /* <Output> */
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230 | /* buffer :: The address of target buffer. */
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231 | /* */
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232 | /* <Return> */
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233 | /* TrueType error code. 0 means success. */
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234 | /* */
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235 | typedef FT_Error
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236 | (*TT_Load_Any_Func)( TT_Face face,
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237 | FT_ULong tag,
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238 | FT_Long offset,
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239 | FT_Byte *buffer,
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240 | FT_ULong* length );
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241 |
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242 |
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243 | /*************************************************************************/
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244 | /* */
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245 | /* <FuncType> */
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246 | /* TT_Find_SBit_Image_Func */
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247 | /* */
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248 | /* <Description> */
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249 | /* Checks whether an embedded bitmap (an `sbit') exists for a given */
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250 | /* glyph, at a given strike. */
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251 | /* */
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252 | /* <Input> */
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253 | /* face :: The target face object. */
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254 | /* */
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255 | /* glyph_index :: The glyph index. */
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256 | /* */
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257 | /* strike_index :: The current strike index. */
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258 | /* */
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259 | /* <Output> */
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260 | /* arange :: The SBit range containing the glyph index. */
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261 | /* */
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262 | /* astrike :: The SBit strike containing the glyph index. */
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263 | /* */
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264 | /* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
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265 | /* */
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266 | /* <Return> */
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267 | /* FreeType error code. 0 means success. Returns */
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268 | /* SFNT_Err_Invalid_Argument if no sbit exists for the requested */
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269 | /* glyph. */
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270 | /* */
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271 | typedef FT_Error
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272 | (*TT_Find_SBit_Image_Func)( TT_Face face,
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273 | FT_UInt glyph_index,
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274 | FT_ULong strike_index,
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275 | TT_SBit_Range *arange,
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276 | TT_SBit_Strike *astrike,
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277 | FT_ULong *aglyph_offset );
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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 | /* <FuncType> */
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283 | /* TT_Load_SBit_Metrics_Func */
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284 | /* */
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285 | /* <Description> */
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286 | /* Gets the big metrics for a given embedded bitmap. */
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287 | /* */
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288 | /* <Input> */
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289 | /* stream :: The input stream. */
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290 | /* */
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291 | /* range :: The SBit range containing the glyph. */
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292 | /* */
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293 | /* <Output> */
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294 | /* big_metrics :: A big SBit metrics structure for the glyph. */
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295 | /* */
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296 | /* <Return> */
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297 | /* FreeType error code. 0 means success. */
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298 | /* */
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299 | /* <Note> */
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300 | /* The stream cursor must be positioned at the glyph's offset within */
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301 | /* the `EBDT' table before the call. */
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302 | /* */
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303 | /* If the image format uses variable metrics, the stream cursor is */
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304 | /* positioned just after the metrics header in the `EBDT' table on */
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305 | /* function exit. */
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306 | /* */
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307 | typedef FT_Error
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308 | (*TT_Load_SBit_Metrics_Func)( FT_Stream stream,
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309 | TT_SBit_Range range,
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310 | TT_SBit_Metrics metrics );
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311 |
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312 |
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313 | /*************************************************************************/
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314 | /* */
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315 | /* <FuncType> */
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316 | /* TT_Load_SBit_Image_Func */
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317 | /* */
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318 | /* <Description> */
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319 | /* Loads a given glyph sbit image from the font resource. This also */
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320 | /* returns its metrics. */
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321 | /* */
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322 | /* <Input> */
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323 | /* face :: */
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324 | /* The target face object. */
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325 | /* */
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326 | /* strike_index :: */
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327 | /* The strike index. */
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328 | /* */
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329 | /* glyph_index :: */
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330 | /* The current glyph index. */
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331 | /* */
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332 | /* load_flags :: */
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333 | /* The current load flags. */
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334 | /* */
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335 | /* stream :: */
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336 | /* The input stream. */
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337 | /* */
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338 | /* <Output> */
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339 | /* amap :: */
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340 | /* The target pixmap. */
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341 | /* */
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342 | /* ametrics :: */
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343 | /* A big sbit metrics structure for the glyph image. */
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344 | /* */
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345 | /* <Return> */
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346 | /* FreeType error code. 0 means success. Returns an error if no */
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347 | /* glyph sbit exists for the index. */
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348 | /* */
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349 | /* <Note> */
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350 | /* The `map.buffer' field is always freed before the glyph is loaded. */
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351 | /* */
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352 | typedef FT_Error
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353 | (*TT_Load_SBit_Image_Func)( TT_Face face,
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354 | FT_ULong strike_index,
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355 | FT_UInt glyph_index,
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356 | FT_UInt load_flags,
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357 | FT_Stream stream,
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358 | FT_Bitmap *amap,
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359 | TT_SBit_MetricsRec *ametrics );
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360 |
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361 |
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362 | /*************************************************************************/
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363 | /* */
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364 | /* <FuncType> */
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365 | /* TT_Set_SBit_Strike_Func */
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366 | /* */
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367 | /* <Description> */
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368 | /* Selects an sbit strike for given horizontal and vertical ppem */
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369 | /* values. */
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370 | /* */
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371 | /* <Input> */
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372 | /* face :: The target face object. */
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373 | /* */
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374 | /* x_ppem :: The horizontal resolution in points per EM. */
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375 | /* */
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376 | /* y_ppem :: The vertical resolution in points per EM. */
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377 | /* */
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378 | /* <Output> */
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379 | /* astrike_index :: The index of the sbit strike. */
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380 | /* */
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381 | /* <Return> */
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382 | /* FreeType error code. 0 means success. Returns an error if no */
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383 | /* sbit strike exists for the selected ppem values. */
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384 | /* */
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385 | typedef FT_Error
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386 | (*TT_Set_SBit_Strike_Func)( TT_Face face,
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387 | FT_UInt x_ppem,
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388 | FT_UInt y_ppem,
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389 | FT_ULong *astrike_index );
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390 |
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391 |
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392 | /*************************************************************************/
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393 | /* */
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394 | /* <FuncType> */
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395 | /* TT_Get_PS_Name_Func */
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396 | /* */
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397 | /* <Description> */
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398 | /* Gets the PostScript glyph name of a glyph. */
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399 | /* */
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400 | /* <Input> */
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401 | /* idx :: The glyph index. */
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402 | /* */
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403 | /* PSname :: The address of a string pointer. Will be NULL in case */
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404 | /* of error, otherwise it is a pointer to the glyph name. */
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405 | /* */
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406 | /* You must not modify the returned string! */
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407 | /* */
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408 | /* <Output> */
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409 | /* FreeType error code. 0 means success. */
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410 | /* */
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411 | typedef FT_Error
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412 | (*TT_Get_PS_Name_Func)( TT_Face face,
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413 | FT_UInt idx,
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414 | FT_String** PSname );
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415 |
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416 |
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417 | /*************************************************************************/
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418 | /* */
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419 | /* <FuncType> */
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420 | /* TT_Load_Metrics_Func */
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421 | /* */
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422 | /* <Description> */
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423 | /* Loads the horizontal or vertical header in a face object. */
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424 | /* */
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425 | /* <Input> */
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426 | /* face :: A handle to the target face object. */
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427 | /* */
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428 | /* stream :: The input stream. */
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429 | /* */
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430 | /* vertical :: A boolean flag. If set, load vertical metrics. */
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431 | /* */
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432 | /* <Return> */
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433 | /* FreeType error code. 0 means success. */
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434 | /* */
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435 | typedef FT_Error
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436 | (*TT_Load_Metrics_Func)( TT_Face face,
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437 | FT_Stream stream,
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438 | FT_Bool vertical );
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439 |
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440 |
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441 | /*************************************************************************/
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442 | /* */
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443 | /* <FuncType> */
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444 | /* TT_Load_Table_Func */
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445 | /* */
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446 | /* <Description> */
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447 | /* Loads a given TrueType table. */
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448 | /* */
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449 | /* <Input> */
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450 | /* face :: A handle to the target face object. */
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451 | /* */
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452 | /* stream :: The input stream. */
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453 | /* */
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454 | /* <Return> */
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455 | /* FreeType error code. 0 means success. */
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456 | /* */
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457 | /* <Note> */
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458 | /* The function will use `face->goto_table' to seek the stream to */
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459 | /* the start of the table. */
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460 | /* */
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461 | typedef FT_Error
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462 | (*TT_Load_Table_Func)( TT_Face face,
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463 | FT_Stream stream );
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464 |
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465 |
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466 | /*************************************************************************/
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467 | /* */
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468 | /* <FuncType> */
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469 | /* TT_Free_Table_Func */
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470 | /* */
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471 | /* <Description> */
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472 | /* Frees a given TrueType table. */
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473 | /* */
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474 | /* <Input> */
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475 | /* face :: A handle to the target face object. */
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476 | /* */
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477 | typedef void
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478 | (*TT_Free_Table_Func)( TT_Face face );
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479 |
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480 |
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481 | /*
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482 | * @functype:
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483 | * TT_Face_GetKerningFunc
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484 | *
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485 | * @description:
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486 | * Return the horizontal kerning value between two glyphs.
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487 | *
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488 | * @input:
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489 | * face :: A handle to the source face object.
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490 | * left_glyph :: The left glyph index.
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491 | * right_glyph :: The right glyph index.
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492 | *
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493 | * @return:
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494 | * The kerning value in font units.
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495 | */
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496 | typedef FT_Int
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497 | (*TT_Face_GetKerningFunc)( TT_Face face,
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498 | FT_UInt left_glyph,
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499 | FT_UInt right_glyph );
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500 |
|
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501 |
|
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502 | /*************************************************************************/
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503 | /* */
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504 | /* <Struct> */
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505 | /* SFNT_Interface */
|
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506 | /* */
|
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507 | /* <Description> */
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508 | /* This structure holds pointers to the functions used to load and */
|
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509 | /* free the basic tables that are required in a `sfnt' font file. */
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510 | /* */
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511 | /* <Fields> */
|
---|
512 | /* Check the various xxx_Func() descriptions for details. */
|
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513 | /* */
|
---|
514 | typedef struct SFNT_Interface_
|
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515 | {
|
---|
516 | TT_Loader_GotoTableFunc goto_table;
|
---|
517 |
|
---|
518 | TT_Init_Face_Func init_face;
|
---|
519 | TT_Load_Face_Func load_face;
|
---|
520 | TT_Done_Face_Func done_face;
|
---|
521 | FT_Module_Requester get_interface;
|
---|
522 |
|
---|
523 | TT_Load_Any_Func load_any;
|
---|
524 | TT_Load_SFNT_HeaderRec_Func load_sfnt_header;
|
---|
525 | TT_Load_Directory_Func load_directory;
|
---|
526 |
|
---|
527 | /* these functions are called by `load_face' but they can also */
|
---|
528 | /* be called from external modules, if there is a need to do so */
|
---|
529 | TT_Load_Table_Func load_header;
|
---|
530 | TT_Load_Metrics_Func load_metrics;
|
---|
531 | TT_Load_Table_Func load_charmaps;
|
---|
532 | TT_Load_Table_Func load_max_profile;
|
---|
533 | TT_Load_Table_Func load_os2;
|
---|
534 | TT_Load_Table_Func load_psnames;
|
---|
535 |
|
---|
536 | TT_Load_Table_Func load_names;
|
---|
537 | TT_Free_Table_Func free_names;
|
---|
538 |
|
---|
539 | /* optional tables */
|
---|
540 | TT_Load_Table_Func load_hdmx;
|
---|
541 | TT_Free_Table_Func free_hdmx;
|
---|
542 |
|
---|
543 | TT_Load_Table_Func load_kerning;
|
---|
544 | TT_Load_Table_Func load_gasp;
|
---|
545 | TT_Load_Table_Func load_pclt;
|
---|
546 |
|
---|
547 | /* see `ttload.h' */
|
---|
548 | TT_Load_Table_Func load_bitmap_header;
|
---|
549 |
|
---|
550 | /* see `ttsbit.h' */
|
---|
551 | TT_Set_SBit_Strike_Func set_sbit_strike;
|
---|
552 | TT_Load_Table_Func load_sbits;
|
---|
553 | TT_Find_SBit_Image_Func find_sbit_image;
|
---|
554 | TT_Load_SBit_Metrics_Func load_sbit_metrics;
|
---|
555 | TT_Load_SBit_Image_Func load_sbit_image;
|
---|
556 | TT_Free_Table_Func free_sbits;
|
---|
557 |
|
---|
558 | /* see `ttkern.h' */
|
---|
559 | TT_Face_GetKerningFunc get_kerning;
|
---|
560 |
|
---|
561 | /* see `ttpost.h' */
|
---|
562 | TT_Get_PS_Name_Func get_psname;
|
---|
563 | TT_Free_Table_Func free_psnames;
|
---|
564 |
|
---|
565 | } SFNT_Interface;
|
---|
566 |
|
---|
567 |
|
---|
568 | /* transitional */
|
---|
569 | typedef SFNT_Interface* SFNT_Service;
|
---|
570 |
|
---|
571 |
|
---|
572 | FT_END_HEADER
|
---|
573 |
|
---|
574 | #endif /* __SFNT_H__ */
|
---|
575 |
|
---|
576 |
|
---|
577 | /* END */
|
---|