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annotate freetype2/freetype/ftsystem.h @ 1769:4baed436fc58 draft

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minor fix
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sat, 23 Nov 2013 02:15:22 +0900
parents a8ab91f49cac
children
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1 /***************************************************************************/
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2 /* */
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3 /* ftsystem.h */
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4 /* */
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5 /* FreeType low-level system interface definition (specification). */
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6 /* */
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7 /* Copyright 1996-2001, 2002, 2005, 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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19 #ifndef __FTSYSTEM_H__
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20 #define __FTSYSTEM_H__
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23 #include <ft2build.h>
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26 FT_BEGIN_HEADER
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27
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29 /*************************************************************************/
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30 /* */
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31 /* <Section> */
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32 /* system_interface */
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33 /* */
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34 /* <Title> */
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35 /* System Interface */
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36 /* */
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37 /* <Abstract> */
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38 /* How FreeType manages memory and i/o. */
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39 /* */
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40 /* <Description> */
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41 /* This section contains various definitions related to memory */
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42 /* management and i/o access. You need to understand this */
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43 /* information if you want to use a custom memory manager or you own */
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44 /* i/o streams. */
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45 /* */
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46 /*************************************************************************/
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47
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49 /*************************************************************************/
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50 /* */
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51 /* M E M O R Y M A N A G E M E N T */
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52 /* */
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53 /*************************************************************************/
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54
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55
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56 /*************************************************************************
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57 *
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58 * @type:
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59 * FT_Memory
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60 *
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61 * @description:
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62 * A handle to a given memory manager object, defined with an
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63 * @FT_MemoryRec structure.
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64 *
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65 */
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66 typedef struct FT_MemoryRec_* FT_Memory;
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67
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68
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69 /*************************************************************************
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70 *
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71 * @functype:
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72 * FT_Alloc_Func
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73 *
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74 * @description:
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75 * A function used to allocate `size' bytes from `memory'.
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76 *
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77 * @input:
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78 * memory ::
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79 * A handle to the source memory manager.
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80 *
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81 * size ::
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82 * The size in bytes to allocate.
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83 *
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84 * @return:
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85 * Address of new memory block. 0~in case of failure.
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86 *
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87 */
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88 typedef void*
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89 (*FT_Alloc_Func)( FT_Memory memory,
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90 long size );
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91
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92
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93 /*************************************************************************
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94 *
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95 * @functype:
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96 * FT_Free_Func
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97 *
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98 * @description:
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99 * A function used to release a given block of memory.
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100 *
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101 * @input:
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102 * memory ::
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103 * A handle to the source memory manager.
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104 *
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105 * block ::
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106 * The address of the target memory block.
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107 *
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108 */
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109 typedef void
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110 (*FT_Free_Func)( FT_Memory memory,
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111 void* block );
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112
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113
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114 /*************************************************************************
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115 *
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116 * @functype:
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117 * FT_Realloc_Func
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118 *
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119 * @description:
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120 * A function used to re-allocate a given block of memory.
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121 *
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122 * @input:
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123 * memory ::
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124 * A handle to the source memory manager.
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125 *
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126 * cur_size ::
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127 * The block's current size in bytes.
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128 *
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129 * new_size ::
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130 * The block's requested new size.
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131 *
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132 * block ::
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133 * The block's current address.
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134 *
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135 * @return:
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136 * New block address. 0~in case of memory shortage.
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137 *
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138 * @note:
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139 * In case of error, the old block must still be available.
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140 *
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141 */
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142 typedef void*
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143 (*FT_Realloc_Func)( FT_Memory memory,
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144 long cur_size,
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145 long new_size,
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146 void* block );
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147
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148
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149 /*************************************************************************
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150 *
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151 * @struct:
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152 * FT_MemoryRec
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153 *
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154 * @description:
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155 * A structure used to describe a given memory manager to FreeType~2.
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156 *
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157 * @fields:
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158 * user ::
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159 * A generic typeless pointer for user data.
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160 *
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161 * alloc ::
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162 * A pointer type to an allocation function.
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163 *
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164 * free ::
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165 * A pointer type to an memory freeing function.
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166 *
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167 * realloc ::
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168 * A pointer type to a reallocation function.
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169 *
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170 */
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171 struct FT_MemoryRec_
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172 {
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173 void* user;
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174 FT_Alloc_Func alloc;
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175 FT_Free_Func free;
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176 FT_Realloc_Func realloc;
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177 };
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178
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179
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180 /*************************************************************************/
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181 /* */
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182 /* I / O M A N A G E M E N T */
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183 /* */
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184 /*************************************************************************/
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185
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186
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187 /*************************************************************************
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188 *
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189 * @type:
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190 * FT_Stream
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191 *
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192 * @description:
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193 * A handle to an input stream.
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194 *
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195 */
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196 typedef struct FT_StreamRec_* FT_Stream;
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197
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198
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199 /*************************************************************************
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200 *
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201 * @struct:
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202 * FT_StreamDesc
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203 *
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204 * @description:
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205 * A union type used to store either a long or a pointer. This is used
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206 * to store a file descriptor or a `FILE*' in an input stream.
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207 *
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208 */
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209 typedef union FT_StreamDesc_
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210 {
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211 long value;
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212 void* pointer;
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213
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214 } FT_StreamDesc;
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215
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216
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217 /*************************************************************************
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218 *
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219 * @functype:
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220 * FT_Stream_IoFunc
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221 *
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222 * @description:
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223 * A function used to seek and read data from a given input stream.
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224 *
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225 * @input:
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226 * stream ::
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227 * A handle to the source stream.
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228 *
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229 * offset ::
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230 * The offset of read in stream (always from start).
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231 *
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232 * buffer ::
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233 * The address of the read buffer.
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234 *
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235 * count ::
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236 * The number of bytes to read from the stream.
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237 *
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238 * @return:
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239 * The number of bytes effectively read by the stream.
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240 *
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241 * @note:
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242 * This function might be called to perform a seek or skip operation
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243 * with a `count' of~0. A non-zero return value then indicates an
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244 * error.
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245 *
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246 */
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247 typedef unsigned long
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248 (*FT_Stream_IoFunc)( FT_Stream stream,
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249 unsigned long offset,
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250 unsigned char* buffer,
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251 unsigned long count );
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252
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253
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254 /*************************************************************************
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255 *
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256 * @functype:
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257 * FT_Stream_CloseFunc
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258 *
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259 * @description:
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260 * A function used to close a given input stream.
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261 *
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262 * @input:
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263 * stream ::
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264 * A handle to the target stream.
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265 *
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266 */
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267 typedef void
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268 (*FT_Stream_CloseFunc)( FT_Stream stream );
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269
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270
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271 /*************************************************************************
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272 *
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273 * @struct:
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274 * FT_StreamRec
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275 *
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276 * @description:
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277 * A structure used to describe an input stream.
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278 *
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279 * @input:
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280 * base ::
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281 * For memory-based streams, this is the address of the first stream
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282 * byte in memory. This field should always be set to NULL for
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283 * disk-based streams.
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284 *
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285 * size ::
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286 * The stream size in bytes.
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287 *
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288 * pos ::
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289 * The current position within the stream.
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290 *
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291 * descriptor ::
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292 * This field is a union that can hold an integer or a pointer. It is
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293 * used by stream implementations to store file descriptors or `FILE*'
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294 * pointers.
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295 *
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296 * pathname ::
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297 * This field is completely ignored by FreeType. However, it is often
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298 * useful during debugging to use it to store the stream's filename
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299 * (where available).
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300 *
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301 * read ::
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302 * The stream's input function.
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303 *
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304 * close ::
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305 * The stream's close function.
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306 *
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307 * memory ::
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308 * The memory manager to use to preload frames. This is set
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309 * internally by FreeType and shouldn't be touched by stream
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310 * implementations.
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311 *
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312 * cursor ::
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313 * This field is set and used internally by FreeType when parsing
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314 * frames.
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315 *
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316 * limit ::
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317 * This field is set and used internally by FreeType when parsing
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318 * frames.
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319 *
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320 */
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321 typedef struct FT_StreamRec_
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322 {
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323 unsigned char* base;
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324 unsigned long size;
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325 unsigned long pos;
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326
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327 FT_StreamDesc descriptor;
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328 FT_StreamDesc pathname;
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329 FT_Stream_IoFunc read;
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330 FT_Stream_CloseFunc close;
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331
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332 FT_Memory memory;
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333 unsigned char* cursor;
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334 unsigned char* limit;
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335
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336 } FT_StreamRec;
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337
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338
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339 /* */
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340
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341
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342 FT_END_HEADER
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343
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344 #endif /* __FTSYSTEM_H__ */
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345
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346
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347 /* END */