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1 /***************************************************************************/ |
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2 /* */ |
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3 /* ftsynth.c */ |
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4 /* */ |
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5 /* FreeType synthesizing code for emboldening and slanting (body). */ |
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6 /* */ |
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7 /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2010 by */ |
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 |
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19 #include <ft2build.h> |
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20 #include FT_SYNTHESIS_H |
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21 #include FT_INTERNAL_DEBUG_H |
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22 #include FT_INTERNAL_OBJECTS_H |
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23 #include FT_OUTLINE_H |
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24 #include FT_BITMAP_H |
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25 |
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26 |
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27 /*************************************************************************/ |
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28 /* */ |
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29 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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30 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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31 /* messages during execution. */ |
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32 /* */ |
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33 #undef FT_COMPONENT |
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34 #define FT_COMPONENT trace_synth |
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35 |
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36 /*************************************************************************/ |
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37 /*************************************************************************/ |
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38 /**** ****/ |
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39 /**** EXPERIMENTAL OBLIQUING SUPPORT ****/ |
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40 /**** ****/ |
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41 /*************************************************************************/ |
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42 /*************************************************************************/ |
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43 |
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44 /* documentation is in ftsynth.h */ |
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45 |
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46 FT_EXPORT_DEF( void ) |
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47 FT_GlyphSlot_Oblique( FT_GlyphSlot slot ) |
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48 { |
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49 FT_Matrix transform; |
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50 FT_Outline* outline = &slot->outline; |
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51 |
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52 |
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53 /* only oblique outline glyphs */ |
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54 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE ) |
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55 return; |
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56 |
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57 /* we don't touch the advance width */ |
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58 |
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59 /* For italic, simply apply a shear transform, with an angle */ |
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60 /* of about 12 degrees. */ |
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61 |
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62 transform.xx = 0x10000L; |
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63 transform.yx = 0x00000L; |
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64 |
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65 transform.xy = 0x06000L; |
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66 transform.yy = 0x10000L; |
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67 |
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68 FT_Outline_Transform( outline, &transform ); |
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69 } |
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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 /**** ****/ |
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75 /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/ |
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76 /**** ****/ |
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77 /*************************************************************************/ |
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78 /*************************************************************************/ |
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79 |
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80 |
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81 /* documentation is in ftsynth.h */ |
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82 |
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83 FT_EXPORT_DEF( void ) |
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84 FT_GlyphSlot_Embolden( FT_GlyphSlot slot ) |
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85 { |
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86 FT_Library library = slot->library; |
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87 FT_Face face = slot->face; |
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88 FT_Error error; |
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89 FT_Pos xstr, ystr; |
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90 |
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91 |
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92 if ( slot->format != FT_GLYPH_FORMAT_OUTLINE && |
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93 slot->format != FT_GLYPH_FORMAT_BITMAP ) |
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94 return; |
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95 |
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96 /* some reasonable strength */ |
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97 xstr = FT_MulFix( face->units_per_EM, |
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98 face->size->metrics.y_scale ) / 24; |
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99 ystr = xstr; |
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100 |
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101 if ( slot->format == FT_GLYPH_FORMAT_OUTLINE ) |
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102 { |
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103 /* ignore error */ |
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104 (void)FT_Outline_Embolden( &slot->outline, xstr ); |
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105 |
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106 /* this is more than enough for most glyphs; if you need accurate */ |
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107 /* values, you have to call FT_Outline_Get_CBox */ |
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108 xstr = xstr * 2; |
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109 ystr = xstr; |
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110 } |
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111 else /* slot->format == FT_GLYPH_FORMAT_BITMAP */ |
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112 { |
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113 /* round to full pixels */ |
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114 xstr &= ~63; |
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115 if ( xstr == 0 ) |
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116 xstr = 1 << 6; |
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117 ystr &= ~63; |
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118 |
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119 /* |
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120 * XXX: overflow check for 16-bit system, for compatibility |
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121 * with FT_GlyphSlot_Embolden() since freetype-2.1.10. |
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122 * unfortunately, this function return no informations |
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123 * about the cause of error. |
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124 */ |
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125 if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN ) |
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126 { |
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127 FT_TRACE1(( "FT_GlyphSlot_Embolden:" )); |
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128 FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr )); |
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129 return; |
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130 } |
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131 error = FT_GlyphSlot_Own_Bitmap( slot ); |
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132 if ( error ) |
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133 return; |
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134 |
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135 error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr ); |
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136 if ( error ) |
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137 return; |
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138 } |
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139 |
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140 if ( slot->advance.x ) |
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141 slot->advance.x += xstr; |
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142 |
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143 if ( slot->advance.y ) |
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144 slot->advance.y += ystr; |
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145 |
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146 slot->metrics.width += xstr; |
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147 slot->metrics.height += ystr; |
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148 slot->metrics.horiBearingY += ystr; |
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149 slot->metrics.horiAdvance += xstr; |
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150 slot->metrics.vertBearingX -= xstr / 2; |
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151 slot->metrics.vertBearingY += ystr; |
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152 slot->metrics.vertAdvance += ystr; |
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153 |
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154 /* XXX: 16-bit overflow case must be excluded before here */ |
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155 if ( slot->format == FT_GLYPH_FORMAT_BITMAP ) |
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156 slot->bitmap_top += (FT_Int)( ystr >> 6 ); |
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157 } |
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158 |
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159 |
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160 /* END */ |