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annotate freetype2/freetype/ftbitmap.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 /* ftbitmap.h */
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4 /* */
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5 /* FreeType utility functions for bitmaps (specification). */
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6 /* */
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7 /* Copyright 2004, 2005, 2006, 2008 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 __FTBITMAP_H__
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20 #define __FTBITMAP_H__
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22
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23 #include <ft2build.h>
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24 #include FT_FREETYPE_H
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25
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26 #ifdef FREETYPE_H
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27 #error "freetype.h of FreeType 1 has been loaded!"
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28 #error "Please fix the directory search order for header files"
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29 #error "so that freetype.h of FreeType 2 is found first."
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30 #endif
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32
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33 FT_BEGIN_HEADER
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34
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35
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36 /*************************************************************************/
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37 /* */
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38 /* <Section> */
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39 /* bitmap_handling */
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40 /* */
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41 /* <Title> */
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42 /* Bitmap Handling */
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43 /* */
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44 /* <Abstract> */
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45 /* Handling FT_Bitmap objects. */
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46 /* */
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47 /* <Description> */
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48 /* This section contains functions for converting FT_Bitmap objects. */
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49 /* */
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50 /*************************************************************************/
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51
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52
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53 /*************************************************************************/
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54 /* */
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55 /* <Function> */
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56 /* FT_Bitmap_New */
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57 /* */
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58 /* <Description> */
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59 /* Initialize a pointer to an @FT_Bitmap structure. */
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60 /* */
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61 /* <InOut> */
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62 /* abitmap :: A pointer to the bitmap structure. */
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63 /* */
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64 FT_EXPORT( void )
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65 FT_Bitmap_New( FT_Bitmap *abitmap );
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66
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67
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68 /*************************************************************************/
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69 /* */
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70 /* <Function> */
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71 /* FT_Bitmap_Copy */
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72 /* */
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73 /* <Description> */
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74 /* Copy a bitmap into another one. */
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75 /* */
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76 /* <Input> */
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77 /* library :: A handle to a library object. */
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78 /* */
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79 /* source :: A handle to the source bitmap. */
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80 /* */
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81 /* <Output> */
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82 /* target :: A handle to the target bitmap. */
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83 /* */
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84 /* <Return> */
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85 /* FreeType error code. 0~means success. */
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86 /* */
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87 FT_EXPORT( FT_Error )
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88 FT_Bitmap_Copy( FT_Library library,
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89 const FT_Bitmap *source,
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90 FT_Bitmap *target);
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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 /* <Function> */
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96 /* FT_Bitmap_Embolden */
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97 /* */
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98 /* <Description> */
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99 /* Embolden a bitmap. The new bitmap will be about `xStrength' */
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100 /* pixels wider and `yStrength' pixels higher. The left and bottom */
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101 /* borders are kept unchanged. */
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102 /* */
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103 /* <Input> */
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104 /* library :: A handle to a library object. */
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105 /* */
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106 /* xStrength :: How strong the glyph is emboldened horizontally. */
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107 /* Expressed in 26.6 pixel format. */
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108 /* */
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109 /* yStrength :: How strong the glyph is emboldened vertically. */
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110 /* Expressed in 26.6 pixel format. */
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111 /* */
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112 /* <InOut> */
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113 /* bitmap :: A handle to the target bitmap. */
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114 /* */
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115 /* <Return> */
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116 /* FreeType error code. 0~means success. */
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117 /* */
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118 /* <Note> */
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119 /* The current implementation restricts `xStrength' to be less than */
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120 /* or equal to~8 if bitmap is of pixel_mode @FT_PIXEL_MODE_MONO. */
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121 /* */
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122 /* If you want to embolden the bitmap owned by a @FT_GlyphSlotRec, */
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123 /* you should call @FT_GlyphSlot_Own_Bitmap on the slot first. */
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124 /* */
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125 FT_EXPORT( FT_Error )
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126 FT_Bitmap_Embolden( FT_Library library,
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127 FT_Bitmap* bitmap,
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128 FT_Pos xStrength,
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129 FT_Pos yStrength );
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130
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131
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132 /*************************************************************************/
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133 /* */
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134 /* <Function> */
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135 /* FT_Bitmap_Convert */
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136 /* */
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137 /* <Description> */
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138 /* Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, or 8bpp to a */
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139 /* bitmap object with depth 8bpp, making the number of used bytes per */
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140 /* line (a.k.a. the `pitch') a multiple of `alignment'. */
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141 /* */
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142 /* <Input> */
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143 /* library :: A handle to a library object. */
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144 /* */
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145 /* source :: The source bitmap. */
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146 /* */
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147 /* alignment :: The pitch of the bitmap is a multiple of this */
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148 /* parameter. Common values are 1, 2, or 4. */
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149 /* */
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150 /* <Output> */
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151 /* target :: The target bitmap. */
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152 /* */
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153 /* <Return> */
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154 /* FreeType error code. 0~means success. */
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155 /* */
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156 /* <Note> */
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157 /* It is possible to call @FT_Bitmap_Convert multiple times without */
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158 /* calling @FT_Bitmap_Done (the memory is simply reallocated). */
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159 /* */
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160 /* Use @FT_Bitmap_Done to finally remove the bitmap object. */
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161 /* */
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162 /* The `library' argument is taken to have access to FreeType's */
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163 /* memory handling functions. */
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164 /* */
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165 FT_EXPORT( FT_Error )
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166 FT_Bitmap_Convert( FT_Library library,
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167 const FT_Bitmap *source,
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168 FT_Bitmap *target,
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169 FT_Int alignment );
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170
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171
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172 /*************************************************************************/
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173 /* */
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174 /* <Function> */
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175 /* FT_GlyphSlot_Own_Bitmap */
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176 /* */
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177 /* <Description> */
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178 /* Make sure that a glyph slot owns `slot->bitmap'. */
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179 /* */
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180 /* <Input> */
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181 /* slot :: The glyph slot. */
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182 /* */
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183 /* <Return> */
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184 /* FreeType error code. 0~means success. */
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185 /* */
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186 /* <Note> */
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187 /* This function is to be used in combination with */
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188 /* @FT_Bitmap_Embolden. */
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189 /* */
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190 FT_EXPORT( FT_Error )
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191 FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot );
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192
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193
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194 /*************************************************************************/
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195 /* */
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196 /* <Function> */
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197 /* FT_Bitmap_Done */
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198 /* */
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199 /* <Description> */
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200 /* Destroy a bitmap object created with @FT_Bitmap_New. */
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201 /* */
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202 /* <Input> */
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203 /* library :: A handle to a library object. */
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204 /* */
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205 /* bitmap :: The bitmap object to be freed. */
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206 /* */
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207 /* <Return> */
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208 /* FreeType error code. 0~means success. */
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209 /* */
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210 /* <Note> */
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211 /* The `library' argument is taken to have access to FreeType's */
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212 /* memory handling functions. */
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213 /* */
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214 FT_EXPORT( FT_Error )
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215 FT_Bitmap_Done( FT_Library library,
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216 FT_Bitmap *bitmap );
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217
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218
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219 /* */
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220
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221
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222 FT_END_HEADER
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223
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224 #endif /* __FTBITMAP_H__ */
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225
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226
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227 /* END */