1 | /***************************************************************************/
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2 | /* */
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3 | /* ftglyph.h */
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4 | /* */
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5 | /* FreeType convenience functions to handle glyphs (specification). */
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6 | /* */
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7 | /* Copyright 1996-2001, 2002, 2003 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 | /*************************************************************************/
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20 | /* */
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21 | /* This file contains the definition of several convenience functions */
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22 | /* that can be used by client applications to easily retrieve glyph */
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23 | /* bitmaps and outlines from a given face. */
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24 | /* */
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25 | /* These functions should be optional if you are writing a font server */
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26 | /* or text layout engine on top of FreeType. However, they are pretty */
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27 | /* handy for many other simple uses of the library. */
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28 | /* */
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29 | /*************************************************************************/
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30 |
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31 |
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32 | #ifndef __FTGLYPH_H__
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33 | #define __FTGLYPH_H__
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34 |
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35 |
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36 | #include <ft2build.h>
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37 | #include FT_FREETYPE_H
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38 |
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39 | #ifdef FREETYPE_H
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40 | #error "freetype.h of FreeType 1 has been loaded!"
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41 | #error "Please fix the directory search order for header files"
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42 | #error "so that freetype.h of FreeType 2 is found first."
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43 | #endif
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44 |
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45 |
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46 | FT_BEGIN_HEADER
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47 |
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48 |
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49 | /*************************************************************************/
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50 | /* */
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51 | /* <Section> */
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52 | /* glyph_management */
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53 | /* */
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54 | /* <Title> */
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55 | /* Glyph Management */
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56 | /* */
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57 | /* <Abstract> */
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58 | /* Generic interface to manage individual glyph data. */
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59 | /* */
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60 | /* <Description> */
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61 | /* This section contains definitions used to manage glyph data */
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62 | /* through generic FT_Glyph objects. Each of them can contain a */
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63 | /* bitmap, a vector outline, or even images in other formats. */
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64 | /* */
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65 | /*************************************************************************/
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66 |
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67 |
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68 | /* forward declaration to a private type */
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69 | typedef struct FT_Glyph_Class_ FT_Glyph_Class;
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70 |
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71 |
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72 | /*************************************************************************/
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73 | /* */
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74 | /* <Type> */
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75 | /* FT_Glyph */
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76 | /* */
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77 | /* <Description> */
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78 | /* Handle to an object used to model generic glyph images. It is a */
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79 | /* pointer to the @FT_GlyphRec structure and can contain a glyph */
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80 | /* bitmap or pointer. */
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81 | /* */
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82 | /* <Note> */
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83 | /* Glyph objects are not owned by the library. You must thus release */
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84 | /* them manually (through @FT_Done_Glyph) _before_ calling */
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85 | /* @FT_Done_FreeType. */
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86 | /* */
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87 | typedef struct FT_GlyphRec_* FT_Glyph;
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88 |
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89 |
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90 | /*************************************************************************/
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91 | /* */
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92 | /* <Struct> */
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93 | /* FT_GlyphRec */
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94 | /* */
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95 | /* <Description> */
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96 | /* The root glyph structure contains a given glyph image plus its */
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97 | /* advance width in 16.16 fixed float format. */
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98 | /* */
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99 | /* <Fields> */
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100 | /* library :: A handle to the FreeType library object. */
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101 | /* */
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102 | /* clazz :: A pointer to the glyph's class. Private. */
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103 | /* */
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104 | /* format :: The format of the glyph's image. */
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105 | /* */
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106 | /* advance :: A 16.16 vector that gives the glyph's advance width. */
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107 | /* */
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108 | typedef struct FT_GlyphRec_
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109 | {
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110 | FT_Library library;
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111 | const FT_Glyph_Class* clazz;
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112 | FT_Glyph_Format format;
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113 | FT_Vector advance;
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114 |
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115 | } FT_GlyphRec;
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116 |
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117 |
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118 | /*************************************************************************/
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119 | /* */
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120 | /* <Type> */
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121 | /* FT_BitmapGlyph */
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122 | /* */
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123 | /* <Description> */
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124 | /* A handle to an object used to model a bitmap glyph image. This is */
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125 | /* a sub-class of @FT_Glyph, and a pointer to @FT_BitmapGlyphRec. */
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126 | /* */
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127 | typedef struct FT_BitmapGlyphRec_* FT_BitmapGlyph;
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128 |
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129 |
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130 | /*************************************************************************/
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131 | /* */
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132 | /* <Struct> */
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133 | /* FT_BitmapGlyphRec */
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134 | /* */
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135 | /* <Description> */
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136 | /* A structure used for bitmap glyph images. This really is a */
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137 | /* `sub-class' of `FT_GlyphRec'. */
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138 | /* */
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139 | /* <Fields> */
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140 | /* root :: The root FT_Glyph fields. */
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141 | /* */
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142 | /* left :: The left-side bearing, i.e., the horizontal distance */
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143 | /* from the current pen position to the left border of the */
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144 | /* glyph bitmap. */
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145 | /* */
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146 | /* top :: The top-side bearing, i.e., the vertical distance from */
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147 | /* the current pen position to the top border of the glyph */
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148 | /* bitmap. This distance is positive for upwards-y! */
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149 | /* */
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150 | /* bitmap :: A descriptor for the bitmap. */
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151 | /* */
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152 | /* <Note> */
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153 | /* You can typecast FT_Glyph to FT_BitmapGlyph if you have */
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154 | /* glyph->format == FT_GLYPH_FORMAT_BITMAP. This lets you access */
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155 | /* the bitmap's contents easily. */
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156 | /* */
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157 | /* The corresponding pixel buffer is always owned by the BitmapGlyph */
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158 | /* and is thus created and destroyed with it. */
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159 | /* */
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160 | typedef struct FT_BitmapGlyphRec_
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161 | {
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162 | FT_GlyphRec root;
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163 | FT_Int left;
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164 | FT_Int top;
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165 | FT_Bitmap bitmap;
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166 |
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167 | } FT_BitmapGlyphRec;
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168 |
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169 |
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170 | /*************************************************************************/
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171 | /* */
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172 | /* <Type> */
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173 | /* FT_OutlineGlyph */
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174 | /* */
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175 | /* <Description> */
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176 | /* A handle to an object used to model an outline glyph image. This */
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177 | /* is a sub-class of @FT_Glyph, and a pointer to @FT_OutlineGlyphRec. */
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178 | /* */
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179 | typedef struct FT_OutlineGlyphRec_* FT_OutlineGlyph;
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180 |
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181 |
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182 | /*************************************************************************/
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183 | /* */
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184 | /* <Struct> */
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185 | /* FT_OutlineGlyphRec */
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186 | /* */
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187 | /* <Description> */
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188 | /* A structure used for outline (vectorial) glyph images. This */
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189 | /* really is a `sub-class' of `FT_GlyphRec'. */
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190 | /* */
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191 | /* <Fields> */
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192 | /* root :: The root FT_Glyph fields. */
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193 | /* */
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194 | /* outline :: A descriptor for the outline. */
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195 | /* */
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196 | /* <Note> */
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197 | /* You can typecast FT_Glyph to FT_OutlineGlyph if you have */
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198 | /* glyph->format == FT_GLYPH_FORMAT_OUTLINE. This lets you access */
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199 | /* the outline's content easily. */
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200 | /* */
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201 | /* As the outline is extracted from a glyph slot, its coordinates are */
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202 | /* expressed normally in 26.6 pixels, unless the flag */
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203 | /* FT_LOAD_NO_SCALE was used in FT_Load_Glyph() or FT_Load_Char(). */
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204 | /* */
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205 | /* The outline's tables are always owned by the object and are */
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206 | /* destroyed with it. */
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207 | /* */
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208 | typedef struct FT_OutlineGlyphRec_
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209 | {
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210 | FT_GlyphRec root;
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211 | FT_Outline outline;
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212 |
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213 | } FT_OutlineGlyphRec;
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214 |
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215 |
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216 | /*************************************************************************/
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217 | /* */
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218 | /* <Function> */
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219 | /* FT_Get_Glyph */
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220 | /* */
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221 | /* <Description> */
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222 | /* A function used to extract a glyph image from a slot. */
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223 | /* */
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224 | /* <Input> */
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225 | /* slot :: A handle to the source glyph slot. */
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226 | /* */
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227 | /* <Output> */
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228 | /* aglyph :: A handle to the glyph object. */
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229 | /* */
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230 | /* <Return> */
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231 | /* FreeType error code. 0 means success. */
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232 | /* */
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233 | FT_EXPORT( FT_Error )
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234 | FT_Get_Glyph( FT_GlyphSlot slot,
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235 | FT_Glyph *aglyph );
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236 |
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237 |
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238 | /*************************************************************************/
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239 | /* */
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240 | /* <Function> */
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241 | /* FT_Glyph_Copy */
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242 | /* */
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243 | /* <Description> */
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244 | /* A function used to copy a glyph image. Note that the created */
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245 | /* @FT_Glyph object must be released with @FT_Done_Glyph. */
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246 | /* */
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247 | /* <Input> */
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248 | /* source :: A handle to the source glyph object. */
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249 | /* */
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250 | /* <Output> */
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251 | /* target :: A handle to the target glyph object. 0 in case of */
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252 | /* error. */
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253 | /* */
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254 | /* <Return> */
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255 | /* FreeType error code. 0 means success. */
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256 | /* */
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257 | FT_EXPORT( FT_Error )
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258 | FT_Glyph_Copy( FT_Glyph source,
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259 | FT_Glyph *target );
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260 |
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261 |
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262 | /*************************************************************************/
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263 | /* */
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264 | /* <Function> */
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265 | /* FT_Glyph_Transform */
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266 | /* */
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267 | /* <Description> */
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268 | /* Transforms a glyph image if its format is scalable. */
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269 | /* */
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270 | /* <InOut> */
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271 | /* glyph :: A handle to the target glyph object. */
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272 | /* */
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273 | /* <Input> */
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274 | /* matrix :: A pointer to a 2x2 matrix to apply. */
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275 | /* */
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276 | /* delta :: A pointer to a 2d vector to apply. Coordinates are */
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277 | /* expressed in 1/64th of a pixel. */
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278 | /* */
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279 | /* <Return> */
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280 | /* FreeType error code (the glyph format is not scalable if it is */
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281 | /* not zero). */
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282 | /* */
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283 | /* <Note> */
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284 | /* The 2x2 transformation matrix is also applied to the glyph's */
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285 | /* advance vector. */
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286 | /* */
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287 | FT_EXPORT( FT_Error )
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288 | FT_Glyph_Transform( FT_Glyph glyph,
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289 | FT_Matrix* matrix,
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290 | FT_Vector* delta );
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291 |
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292 |
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293 | /*************************************************************************/
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294 | /* */
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295 | /* <Enum> */
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296 | /* FT_Glyph_BBox_Mode */
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297 | /* */
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298 | /* <Description> */
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299 | /* The mode how the values of @FT_Glyph_Get_CBox are returned. */
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300 | /* */
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301 | /* <Values> */
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302 | /* FT_GLYPH_BBOX_UNSCALED :: */
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303 | /* Return unscaled font units. */
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304 | /* */
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305 | /* FT_GLYPH_BBOX_SUBPIXELS :: */
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306 | /* Return unfitted 26.6 coordinates. */
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307 | /* */
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308 | /* FT_GLYPH_BBOX_GRIDFIT :: */
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309 | /* Return grid-fitted 26.6 coordinates. */
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310 | /* */
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311 | /* FT_GLYPH_BBOX_TRUNCATE :: */
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312 | /* Return coordinates in integer pixels. */
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313 | /* */
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314 | /* FT_GLYPH_BBOX_PIXELS :: */
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315 | /* Return grid-fitted pixel coordinates. */
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316 | /* */
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317 | typedef enum FT_Glyph_BBox_Mode_
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318 | {
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319 | FT_GLYPH_BBOX_UNSCALED = 0,
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320 | FT_GLYPH_BBOX_SUBPIXELS = 0,
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321 | FT_GLYPH_BBOX_GRIDFIT = 1,
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322 | FT_GLYPH_BBOX_TRUNCATE = 2,
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323 | FT_GLYPH_BBOX_PIXELS = 3
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324 |
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325 | } FT_Glyph_BBox_Mode;
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326 |
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327 |
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328 | /*************************************************************************/
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329 | /* */
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330 | /* <Enum> */
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331 | /* ft_glyph_bbox_xxx */
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332 | /* */
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333 | /* <Description> */
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334 | /* These constants are deprecated. Use the corresponding */
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335 | /* @FT_Glyph_BBox_Mode values instead. */
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336 | /* */
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337 | /* <Values> */
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338 | /* ft_glyph_bbox_unscaled :: see @FT_GLYPH_BBOX_UNSCALED */
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339 | /* ft_glyph_bbox_subpixels :: see @FT_GLYPH_BBOX_SUBPIXELS */
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340 | /* ft_glyph_bbox_gridfit :: see @FT_GLYPH_BBOX_GRIDFIT */
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341 | /* ft_glyph_bbox_truncate :: see @FT_GLYPH_BBOX_TRUNCATE */
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342 | /* ft_glyph_bbox_pixels :: see @FT_GLYPH_BBOX_PIXELS */
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343 | /* */
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344 | #define ft_glyph_bbox_unscaled FT_GLYPH_BBOX_UNSCALED
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345 | #define ft_glyph_bbox_subpixels FT_GLYPH_BBOX_SUBPIXELS
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346 | #define ft_glyph_bbox_gridfit FT_GLYPH_BBOX_GRIDFIT
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347 | #define ft_glyph_bbox_truncate FT_GLYPH_BBOX_TRUNCATE
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348 | #define ft_glyph_bbox_pixels FT_GLYPH_BBOX_PIXELS
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349 |
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350 |
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351 | /*************************************************************************/
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352 | /* */
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353 | /* <Function> */
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354 | /* FT_Glyph_Get_CBox */
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355 | /* */
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356 | /* <Description> */
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357 | /* Returns a glyph's `control box'. The control box encloses all the */
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358 | /* outline's points, including Bezier control points. Though it */
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359 | /* coincides with the exact bounding box for most glyphs, it can be */
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360 | /* slightly larger in some situations (like when rotating an outline */
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361 | /* which contains Bezier outside arcs). */
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362 | /* */
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363 | /* Computing the control box is very fast, while getting the bounding */
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364 | /* box can take much more time as it needs to walk over all segments */
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365 | /* and arcs in the outline. To get the latter, you can use the */
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366 | /* `ftbbox' component which is dedicated to this single task. */
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367 | /* */
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368 | /* <Input> */
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369 | /* glyph :: A handle to the source glyph object. */
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370 | /* */
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371 | /* mode :: The mode which indicates how to interpret the returned */
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372 | /* bounding box values. */
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373 | /* */
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374 | /* <Output> */
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375 | /* acbox :: The glyph coordinate bounding box. Coordinates are */
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376 | /* expressed in 1/64th of pixels if it is grid-fitted. */
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377 | /* */
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378 | /* <Note> */
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379 | /* Coordinates are relative to the glyph origin, using the Y-upwards */
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380 | /* convention. */
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381 | /* */
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382 | /* If the glyph has been loaded with FT_LOAD_NO_SCALE, `bbox_mode' */
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383 | /* must be set to `FT_GLYPH_BBOX_UNSCALED' to get unscaled font */
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384 | /* units in 26.6 pixel format. The value `FT_GLYPH_BBOX_SUBPIXELS' */
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385 | /* is another name for this constant. */
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386 | /* */
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387 | /* Note that the maximum coordinates are exclusive, which means that */
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388 | /* one can compute the width and height of the glyph image (be it in */
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389 | /* integer or 26.6 pixels) as: */
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390 | /* */
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391 | /* width = bbox.xMax - bbox.xMin; */
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392 | /* height = bbox.yMax - bbox.yMin; */
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393 | /* */
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394 | /* Note also that for 26.6 coordinates, if `bbox_mode' is set to */
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395 | /* `FT_GLYPH_BBOX_GRIDFIT', the coordinates will also be grid-fitted, */
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396 | /* which corresponds to: */
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397 | /* */
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398 | /* bbox.xMin = FLOOR(bbox.xMin); */
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399 | /* bbox.yMin = FLOOR(bbox.yMin); */
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400 | /* bbox.xMax = CEILING(bbox.xMax); */
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401 | /* bbox.yMax = CEILING(bbox.yMax); */
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402 | /* */
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403 | /* To get the bbox in pixel coordinates, set `bbox_mode' to */
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404 | /* `FT_GLYPH_BBOX_TRUNCATE'. */
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405 | /* */
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406 | /* To get the bbox in grid-fitted pixel coordinates, set `bbox_mode' */
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407 | /* to `FT_GLYPH_BBOX_PIXELS'. */
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408 | /* */
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409 | FT_EXPORT( void )
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410 | FT_Glyph_Get_CBox( FT_Glyph glyph,
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411 | FT_UInt bbox_mode,
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412 | FT_BBox *acbox );
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413 |
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414 |
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415 | /*************************************************************************/
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416 | /* */
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417 | /* <Function> */
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418 | /* FT_Glyph_To_Bitmap */
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419 | /* */
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420 | /* <Description> */
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421 | /* Converts a given glyph object to a bitmap glyph object. */
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422 | /* */
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423 | /* <InOut> */
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424 | /* the_glyph :: A pointer to a handle to the target glyph. */
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425 | /* */
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426 | /* <Input> */
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427 | /* render_mode :: An enumeration that describe how the data is */
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428 | /* rendered. */
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429 | /* */
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430 | /* origin :: A pointer to a vector used to translate the glyph */
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431 | /* image before rendering. Can be 0 (if no */
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432 | /* translation). The origin is expressed in */
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433 | /* 26.6 pixels. */
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434 | /* */
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435 | /* destroy :: A boolean that indicates that the original glyph */
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436 | /* image should be destroyed by this function. It is */
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437 | /* never destroyed in case of error. */
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438 | /* */
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439 | /* <Return> */
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440 | /* FreeType error code. 0 means success. */
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441 | /* */
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442 | /* <Note> */
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443 | /* The glyph image is translated with the `origin' vector before */
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444 | /* rendering. */
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445 | /* */
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446 | /* The first parameter is a pointer to a FT_Glyph handle, that will */
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447 | /* be replaced by this function. Typically, you would use (omitting */
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448 | /* error handling): */
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449 | /* */
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450 | /* */
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451 | /* { */
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452 | /* FT_Glyph glyph; */
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453 | /* FT_BitmapGlyph glyph_bitmap; */
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454 | /* */
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455 | /* */
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456 | /* // load glyph */
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457 | /* error = FT_Load_Char( face, glyph_index, FT_LOAD_DEFAUT ); */
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458 | /* */
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459 | /* // extract glyph image */
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460 | /* error = FT_Get_Glyph( face->glyph, &glyph ); */
|
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461 | /* */
|
---|
462 | /* // convert to a bitmap (default render mode + destroy old) */
|
---|
463 | /* if ( glyph->format != FT_GLYPH_FORMAT_BITMAP ) */
|
---|
464 | /* { */
|
---|
465 | /* error = FT_Glyph_To_Bitmap( &glyph, FT_RENDER_MODE_DEFAULT, */
|
---|
466 | /* 0, 1 ); */
|
---|
467 | /* if ( error ) // glyph unchanged */
|
---|
468 | /* ... */
|
---|
469 | /* } */
|
---|
470 | /* */
|
---|
471 | /* // access bitmap content by typecasting */
|
---|
472 | /* glyph_bitmap = (FT_BitmapGlyph)glyph; */
|
---|
473 | /* */
|
---|
474 | /* // do funny stuff with it, like blitting/drawing */
|
---|
475 | /* ... */
|
---|
476 | /* */
|
---|
477 | /* // discard glyph image (bitmap or not) */
|
---|
478 | /* FT_Done_Glyph( glyph ); */
|
---|
479 | /* } */
|
---|
480 | /* */
|
---|
481 | /* */
|
---|
482 | /* This function does nothing if the glyph format isn't scalable. */
|
---|
483 | /* */
|
---|
484 | FT_EXPORT( FT_Error )
|
---|
485 | FT_Glyph_To_Bitmap( FT_Glyph* the_glyph,
|
---|
486 | FT_Render_Mode render_mode,
|
---|
487 | FT_Vector* origin,
|
---|
488 | FT_Bool destroy );
|
---|
489 |
|
---|
490 |
|
---|
491 | /*************************************************************************/
|
---|
492 | /* */
|
---|
493 | /* <Function> */
|
---|
494 | /* FT_Done_Glyph */
|
---|
495 | /* */
|
---|
496 | /* <Description> */
|
---|
497 | /* Destroys a given glyph. */
|
---|
498 | /* */
|
---|
499 | /* <Input> */
|
---|
500 | /* glyph :: A handle to the target glyph object. */
|
---|
501 | /* */
|
---|
502 | FT_EXPORT( void )
|
---|
503 | FT_Done_Glyph( FT_Glyph glyph );
|
---|
504 |
|
---|
505 |
|
---|
506 | /* other helpful functions */
|
---|
507 |
|
---|
508 | /*************************************************************************/
|
---|
509 | /* */
|
---|
510 | /* <Section> */
|
---|
511 | /* computations */
|
---|
512 | /* */
|
---|
513 | /*************************************************************************/
|
---|
514 |
|
---|
515 |
|
---|
516 | /*************************************************************************/
|
---|
517 | /* */
|
---|
518 | /* <Function> */
|
---|
519 | /* FT_Matrix_Multiply */
|
---|
520 | /* */
|
---|
521 | /* <Description> */
|
---|
522 | /* Performs the matrix operation `b = a*b'. */
|
---|
523 | /* */
|
---|
524 | /* <Input> */
|
---|
525 | /* a :: A pointer to matrix `a'. */
|
---|
526 | /* */
|
---|
527 | /* <InOut> */
|
---|
528 | /* b :: A pointer to matrix `b'. */
|
---|
529 | /* */
|
---|
530 | /* <Note> */
|
---|
531 | /* The result is undefined if either `a' or `b' is zero. */
|
---|
532 | /* */
|
---|
533 | FT_EXPORT( void )
|
---|
534 | FT_Matrix_Multiply( const FT_Matrix* a,
|
---|
535 | FT_Matrix* b );
|
---|
536 |
|
---|
537 |
|
---|
538 | /*************************************************************************/
|
---|
539 | /* */
|
---|
540 | /* <Function> */
|
---|
541 | /* FT_Matrix_Invert */
|
---|
542 | /* */
|
---|
543 | /* <Description> */
|
---|
544 | /* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */
|
---|
545 | /* */
|
---|
546 | /* <InOut> */
|
---|
547 | /* matrix :: A pointer to the target matrix. Remains untouched in */
|
---|
548 | /* case of error. */
|
---|
549 | /* */
|
---|
550 | /* <Return> */
|
---|
551 | /* FreeType error code. 0 means success. */
|
---|
552 | /* */
|
---|
553 | FT_EXPORT( FT_Error )
|
---|
554 | FT_Matrix_Invert( FT_Matrix* matrix );
|
---|
555 |
|
---|
556 |
|
---|
557 | /* */
|
---|
558 |
|
---|
559 |
|
---|
560 | FT_END_HEADER
|
---|
561 |
|
---|
562 | #endif /* __FTGLYPH_H__ */
|
---|
563 |
|
---|
564 |
|
---|
565 | /* END */
|
---|