1 /***************************************************************************/ |
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2 /* */ |
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3 /* ftoutln.c */ |
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4 /* */ |
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5 /* FreeType outline management (body). */ |
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6 /* */ |
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7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 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 /*************************************************************************/ |
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20 /* */ |
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21 /* All functions are declared in freetype.h. */ |
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22 /* */ |
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23 /*************************************************************************/ |
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24 |
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25 |
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26 #include <ft2build.h> |
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27 #include FT_OUTLINE_H |
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28 #include FT_INTERNAL_OBJECTS_H |
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29 #include FT_INTERNAL_DEBUG_H |
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30 #include FT_TRIGONOMETRY_H |
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31 |
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32 |
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33 /*************************************************************************/ |
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34 /* */ |
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35 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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36 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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37 /* messages during execution. */ |
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38 /* */ |
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39 #undef FT_COMPONENT |
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40 #define FT_COMPONENT trace_outline |
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41 |
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42 |
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43 static |
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44 const FT_Outline null_outline = { 0, 0, 0, 0, 0, 0 }; |
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45 |
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46 |
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47 /* documentation is in ftoutln.h */ |
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48 |
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49 FT_EXPORT_DEF( FT_Error ) |
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50 FT_Outline_Decompose( FT_Outline* outline, |
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51 const FT_Outline_Funcs* func_interface, |
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52 void* user ) |
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53 { |
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54 #undef SCALED |
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55 #define SCALED( x ) ( ( (x) << shift ) - delta ) |
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56 |
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57 FT_Vector v_last; |
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58 FT_Vector v_control; |
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59 FT_Vector v_start; |
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60 |
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61 FT_Vector* point; |
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62 FT_Vector* limit; |
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63 char* tags; |
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64 |
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65 FT_Error error; |
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66 |
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67 FT_Int n; /* index of contour in outline */ |
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68 FT_UInt first; /* index of first point in contour */ |
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69 FT_Int tag; /* current point's state */ |
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70 |
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71 FT_Int shift; |
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72 FT_Pos delta; |
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73 |
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74 |
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75 if ( !outline || !func_interface ) |
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76 return FT_Err_Invalid_Argument; |
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77 |
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78 shift = func_interface->shift; |
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79 delta = func_interface->delta; |
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80 first = 0; |
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81 |
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82 for ( n = 0; n < outline->n_contours; n++ ) |
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83 { |
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84 FT_Int last; /* index of last point in contour */ |
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85 |
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86 |
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87 FT_TRACE5(( "FT_Outline_Decompose: Outline %d\n", n )); |
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88 |
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89 last = outline->contours[n]; |
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90 if ( last < 0 ) |
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91 goto Invalid_Outline; |
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92 limit = outline->points + last; |
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93 |
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94 v_start = outline->points[first]; |
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95 v_start.x = SCALED( v_start.x ); |
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96 v_start.y = SCALED( v_start.y ); |
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97 |
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98 v_last = outline->points[last]; |
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99 v_last.x = SCALED( v_last.x ); |
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100 v_last.y = SCALED( v_last.y ); |
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101 |
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102 v_control = v_start; |
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103 |
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104 point = outline->points + first; |
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105 tags = outline->tags + first; |
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106 tag = FT_CURVE_TAG( tags[0] ); |
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107 |
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108 /* A contour cannot start with a cubic control point! */ |
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109 if ( tag == FT_CURVE_TAG_CUBIC ) |
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110 goto Invalid_Outline; |
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111 |
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112 /* check first point to determine origin */ |
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113 if ( tag == FT_CURVE_TAG_CONIC ) |
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114 { |
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115 /* first point is conic control. Yes, this happens. */ |
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116 if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON ) |
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117 { |
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118 /* start at last point if it is on the curve */ |
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119 v_start = v_last; |
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120 limit--; |
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121 } |
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122 else |
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123 { |
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124 /* if both first and last points are conic, */ |
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125 /* start at their middle and record its position */ |
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126 /* for closure */ |
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127 v_start.x = ( v_start.x + v_last.x ) / 2; |
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128 v_start.y = ( v_start.y + v_last.y ) / 2; |
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129 |
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130 v_last = v_start; |
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131 } |
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132 point--; |
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133 tags--; |
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134 } |
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135 |
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136 FT_TRACE5(( " move to (%.2f, %.2f)\n", |
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137 v_start.x / 64.0, v_start.y / 64.0 )); |
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138 error = func_interface->move_to( &v_start, user ); |
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139 if ( error ) |
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140 goto Exit; |
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141 |
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142 while ( point < limit ) |
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143 { |
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144 point++; |
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145 tags++; |
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146 |
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147 tag = FT_CURVE_TAG( tags[0] ); |
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148 switch ( tag ) |
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149 { |
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150 case FT_CURVE_TAG_ON: /* emit a single line_to */ |
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151 { |
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152 FT_Vector vec; |
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153 |
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154 |
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155 vec.x = SCALED( point->x ); |
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156 vec.y = SCALED( point->y ); |
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157 |
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158 FT_TRACE5(( " line to (%.2f, %.2f)\n", |
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159 vec.x / 64.0, vec.y / 64.0 )); |
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160 error = func_interface->line_to( &vec, user ); |
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161 if ( error ) |
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162 goto Exit; |
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163 continue; |
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164 } |
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165 |
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166 case FT_CURVE_TAG_CONIC: /* consume conic arcs */ |
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167 v_control.x = SCALED( point->x ); |
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168 v_control.y = SCALED( point->y ); |
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169 |
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170 Do_Conic: |
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171 if ( point < limit ) |
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172 { |
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173 FT_Vector vec; |
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174 FT_Vector v_middle; |
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175 |
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176 |
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177 point++; |
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178 tags++; |
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179 tag = FT_CURVE_TAG( tags[0] ); |
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180 |
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181 vec.x = SCALED( point->x ); |
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182 vec.y = SCALED( point->y ); |
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183 |
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184 if ( tag == FT_CURVE_TAG_ON ) |
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185 { |
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186 FT_TRACE5(( " conic to (%.2f, %.2f)" |
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187 " with control (%.2f, %.2f)\n", |
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188 vec.x / 64.0, vec.y / 64.0, |
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189 v_control.x / 64.0, v_control.y / 64.0 )); |
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190 error = func_interface->conic_to( &v_control, &vec, user ); |
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191 if ( error ) |
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192 goto Exit; |
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193 continue; |
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194 } |
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195 |
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196 if ( tag != FT_CURVE_TAG_CONIC ) |
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197 goto Invalid_Outline; |
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198 |
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199 v_middle.x = ( v_control.x + vec.x ) / 2; |
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200 v_middle.y = ( v_control.y + vec.y ) / 2; |
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201 |
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202 FT_TRACE5(( " conic to (%.2f, %.2f)" |
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203 " with control (%.2f, %.2f)\n", |
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204 v_middle.x / 64.0, v_middle.y / 64.0, |
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205 v_control.x / 64.0, v_control.y / 64.0 )); |
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206 error = func_interface->conic_to( &v_control, &v_middle, user ); |
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207 if ( error ) |
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208 goto Exit; |
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209 |
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210 v_control = vec; |
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211 goto Do_Conic; |
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212 } |
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213 |
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214 FT_TRACE5(( " conic to (%.2f, %.2f)" |
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215 " with control (%.2f, %.2f)\n", |
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216 v_start.x / 64.0, v_start.y / 64.0, |
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217 v_control.x / 64.0, v_control.y / 64.0 )); |
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218 error = func_interface->conic_to( &v_control, &v_start, user ); |
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219 goto Close; |
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220 |
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221 default: /* FT_CURVE_TAG_CUBIC */ |
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222 { |
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223 FT_Vector vec1, vec2; |
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224 |
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225 |
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226 if ( point + 1 > limit || |
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227 FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC ) |
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228 goto Invalid_Outline; |
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229 |
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230 point += 2; |
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231 tags += 2; |
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232 |
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233 vec1.x = SCALED( point[-2].x ); |
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234 vec1.y = SCALED( point[-2].y ); |
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235 |
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236 vec2.x = SCALED( point[-1].x ); |
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237 vec2.y = SCALED( point[-1].y ); |
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238 |
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239 if ( point <= limit ) |
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240 { |
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241 FT_Vector vec; |
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242 |
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243 |
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244 vec.x = SCALED( point->x ); |
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245 vec.y = SCALED( point->y ); |
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246 |
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247 FT_TRACE5(( " cubic to (%.2f, %.2f)" |
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248 " with controls (%.2f, %.2f) and (%.2f, %.2f)\n", |
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249 vec.x / 64.0, vec.y / 64.0, |
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250 vec1.x / 64.0, vec1.y / 64.0, |
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251 vec2.x / 64.0, vec2.y / 64.0 )); |
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252 error = func_interface->cubic_to( &vec1, &vec2, &vec, user ); |
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253 if ( error ) |
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254 goto Exit; |
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255 continue; |
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256 } |
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257 |
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258 FT_TRACE5(( " cubic to (%.2f, %.2f)" |
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259 " with controls (%.2f, %.2f) and (%.2f, %.2f)\n", |
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260 v_start.x / 64.0, v_start.y / 64.0, |
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261 vec1.x / 64.0, vec1.y / 64.0, |
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262 vec2.x / 64.0, vec2.y / 64.0 )); |
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263 error = func_interface->cubic_to( &vec1, &vec2, &v_start, user ); |
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264 goto Close; |
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265 } |
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266 } |
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267 } |
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268 |
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269 /* close the contour with a line segment */ |
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270 FT_TRACE5(( " line to (%.2f, %.2f)\n", |
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271 v_start.x / 64.0, v_start.y / 64.0 )); |
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272 error = func_interface->line_to( &v_start, user ); |
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273 |
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274 Close: |
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275 if ( error ) |
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276 goto Exit; |
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277 |
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278 first = last + 1; |
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279 } |
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280 |
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281 FT_TRACE5(( "FT_Outline_Decompose: Done\n", n )); |
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282 return FT_Err_Ok; |
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283 |
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284 Exit: |
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285 FT_TRACE5(( "FT_Outline_Decompose: Error %d\n", error )); |
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286 return error; |
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287 |
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288 Invalid_Outline: |
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289 return FT_Err_Invalid_Outline; |
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290 } |
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291 |
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292 |
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293 FT_EXPORT_DEF( FT_Error ) |
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294 FT_Outline_New_Internal( FT_Memory memory, |
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295 FT_UInt numPoints, |
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296 FT_Int numContours, |
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297 FT_Outline *anoutline ) |
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298 { |
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299 FT_Error error; |
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300 |
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301 |
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302 if ( !anoutline || !memory ) |
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303 return FT_Err_Invalid_Argument; |
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304 |
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305 *anoutline = null_outline; |
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306 |
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307 if ( FT_NEW_ARRAY( anoutline->points, numPoints ) || |
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308 FT_NEW_ARRAY( anoutline->tags, numPoints ) || |
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309 FT_NEW_ARRAY( anoutline->contours, numContours ) ) |
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310 goto Fail; |
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311 |
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312 anoutline->n_points = (FT_UShort)numPoints; |
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313 anoutline->n_contours = (FT_Short)numContours; |
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314 anoutline->flags |= FT_OUTLINE_OWNER; |
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315 |
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316 return FT_Err_Ok; |
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317 |
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318 Fail: |
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319 anoutline->flags |= FT_OUTLINE_OWNER; |
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320 FT_Outline_Done_Internal( memory, anoutline ); |
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321 |
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322 return error; |
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323 } |
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324 |
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325 |
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326 /* documentation is in ftoutln.h */ |
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327 |
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328 FT_EXPORT_DEF( FT_Error ) |
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329 FT_Outline_New( FT_Library library, |
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330 FT_UInt numPoints, |
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331 FT_Int numContours, |
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332 FT_Outline *anoutline ) |
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333 { |
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334 if ( !library ) |
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335 return FT_Err_Invalid_Library_Handle; |
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336 |
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337 return FT_Outline_New_Internal( library->memory, numPoints, |
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338 numContours, anoutline ); |
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339 } |
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340 |
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341 |
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342 /* documentation is in ftoutln.h */ |
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343 |
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344 FT_EXPORT_DEF( FT_Error ) |
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345 FT_Outline_Check( FT_Outline* outline ) |
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346 { |
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347 if ( outline ) |
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348 { |
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349 FT_Int n_points = outline->n_points; |
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350 FT_Int n_contours = outline->n_contours; |
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351 FT_Int end0, end; |
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352 FT_Int n; |
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353 |
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354 |
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355 /* empty glyph? */ |
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356 if ( n_points == 0 && n_contours == 0 ) |
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357 return 0; |
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358 |
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359 /* check point and contour counts */ |
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360 if ( n_points <= 0 || n_contours <= 0 ) |
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361 goto Bad; |
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362 |
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363 end0 = end = -1; |
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364 for ( n = 0; n < n_contours; n++ ) |
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365 { |
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366 end = outline->contours[n]; |
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367 |
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368 /* note that we don't accept empty contours */ |
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369 if ( end <= end0 || end >= n_points ) |
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370 goto Bad; |
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371 |
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372 end0 = end; |
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373 } |
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374 |
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375 if ( end != n_points - 1 ) |
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376 goto Bad; |
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377 |
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378 /* XXX: check the tags array */ |
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379 return 0; |
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380 } |
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381 |
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382 Bad: |
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383 return FT_Err_Invalid_Argument; |
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384 } |
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385 |
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386 |
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387 /* documentation is in ftoutln.h */ |
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388 |
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389 FT_EXPORT_DEF( FT_Error ) |
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390 FT_Outline_Copy( const FT_Outline* source, |
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391 FT_Outline *target ) |
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392 { |
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393 FT_Int is_owner; |
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394 |
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395 |
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396 if ( !source || !target || |
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397 source->n_points != target->n_points || |
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398 source->n_contours != target->n_contours ) |
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399 return FT_Err_Invalid_Argument; |
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400 |
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401 if ( source == target ) |
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402 return FT_Err_Ok; |
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403 |
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404 FT_ARRAY_COPY( target->points, source->points, source->n_points ); |
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405 |
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406 FT_ARRAY_COPY( target->tags, source->tags, source->n_points ); |
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407 |
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408 FT_ARRAY_COPY( target->contours, source->contours, source->n_contours ); |
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409 |
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410 /* copy all flags, except the `FT_OUTLINE_OWNER' one */ |
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411 is_owner = target->flags & FT_OUTLINE_OWNER; |
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412 target->flags = source->flags; |
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413 |
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414 target->flags &= ~FT_OUTLINE_OWNER; |
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415 target->flags |= is_owner; |
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416 |
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417 return FT_Err_Ok; |
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418 } |
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419 |
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420 |
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421 FT_EXPORT_DEF( FT_Error ) |
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422 FT_Outline_Done_Internal( FT_Memory memory, |
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423 FT_Outline* outline ) |
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424 { |
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425 if ( memory && outline ) |
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426 { |
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427 if ( outline->flags & FT_OUTLINE_OWNER ) |
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428 { |
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429 FT_FREE( outline->points ); |
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430 FT_FREE( outline->tags ); |
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431 FT_FREE( outline->contours ); |
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432 } |
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433 *outline = null_outline; |
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434 |
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435 return FT_Err_Ok; |
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436 } |
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437 else |
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438 return FT_Err_Invalid_Argument; |
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439 } |
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440 |
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441 |
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442 /* documentation is in ftoutln.h */ |
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443 |
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444 FT_EXPORT_DEF( FT_Error ) |
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445 FT_Outline_Done( FT_Library library, |
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446 FT_Outline* outline ) |
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447 { |
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448 /* check for valid `outline' in FT_Outline_Done_Internal() */ |
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449 |
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450 if ( !library ) |
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451 return FT_Err_Invalid_Library_Handle; |
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452 |
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453 return FT_Outline_Done_Internal( library->memory, outline ); |
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454 } |
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455 |
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456 |
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457 /* documentation is in ftoutln.h */ |
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458 |
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459 FT_EXPORT_DEF( void ) |
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460 FT_Outline_Get_CBox( const FT_Outline* outline, |
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461 FT_BBox *acbox ) |
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462 { |
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463 FT_Pos xMin, yMin, xMax, yMax; |
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464 |
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465 |
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466 if ( outline && acbox ) |
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467 { |
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468 if ( outline->n_points == 0 ) |
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469 { |
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470 xMin = 0; |
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471 yMin = 0; |
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472 xMax = 0; |
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473 yMax = 0; |
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474 } |
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475 else |
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476 { |
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477 FT_Vector* vec = outline->points; |
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478 FT_Vector* limit = vec + outline->n_points; |
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479 |
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480 |
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481 xMin = xMax = vec->x; |
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482 yMin = yMax = vec->y; |
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483 vec++; |
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484 |
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485 for ( ; vec < limit; vec++ ) |
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486 { |
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487 FT_Pos x, y; |
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488 |
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489 |
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490 x = vec->x; |
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491 if ( x < xMin ) xMin = x; |
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492 if ( x > xMax ) xMax = x; |
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493 |
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494 y = vec->y; |
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495 if ( y < yMin ) yMin = y; |
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496 if ( y > yMax ) yMax = y; |
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497 } |
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498 } |
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499 acbox->xMin = xMin; |
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500 acbox->xMax = xMax; |
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501 acbox->yMin = yMin; |
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502 acbox->yMax = yMax; |
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503 } |
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504 } |
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505 |
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506 |
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507 /* documentation is in ftoutln.h */ |
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508 |
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509 FT_EXPORT_DEF( void ) |
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510 FT_Outline_Translate( const FT_Outline* outline, |
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511 FT_Pos xOffset, |
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512 FT_Pos yOffset ) |
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513 { |
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514 FT_UShort n; |
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515 FT_Vector* vec; |
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516 |
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517 |
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518 if ( !outline ) |
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519 return; |
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520 |
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521 vec = outline->points; |
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522 |
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523 for ( n = 0; n < outline->n_points; n++ ) |
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524 { |
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525 vec->x += xOffset; |
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526 vec->y += yOffset; |
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527 vec++; |
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528 } |
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529 } |
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530 |
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531 |
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532 /* documentation is in ftoutln.h */ |
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533 |
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534 FT_EXPORT_DEF( void ) |
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535 FT_Outline_Reverse( FT_Outline* outline ) |
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536 { |
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537 FT_UShort n; |
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538 FT_Int first, last; |
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539 |
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540 |
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541 if ( !outline ) |
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542 return; |
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543 |
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544 first = 0; |
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545 |
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546 for ( n = 0; n < outline->n_contours; n++ ) |
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547 { |
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548 last = outline->contours[n]; |
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549 |
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550 /* reverse point table */ |
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551 { |
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552 FT_Vector* p = outline->points + first; |
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553 FT_Vector* q = outline->points + last; |
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554 FT_Vector swap; |
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555 |
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556 |
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557 while ( p < q ) |
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558 { |
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559 swap = *p; |
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560 *p = *q; |
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561 *q = swap; |
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562 p++; |
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563 q--; |
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564 } |
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565 } |
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566 |
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567 /* reverse tags table */ |
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568 { |
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569 char* p = outline->tags + first; |
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570 char* q = outline->tags + last; |
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571 char swap; |
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572 |
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573 |
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574 while ( p < q ) |
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575 { |
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576 swap = *p; |
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577 *p = *q; |
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578 *q = swap; |
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579 p++; |
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580 q--; |
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581 } |
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582 } |
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583 |
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584 first = last + 1; |
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585 } |
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586 |
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587 outline->flags ^= FT_OUTLINE_REVERSE_FILL; |
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588 } |
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589 |
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590 |
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591 /* documentation is in ftoutln.h */ |
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592 |
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593 FT_EXPORT_DEF( FT_Error ) |
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594 FT_Outline_Render( FT_Library library, |
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595 FT_Outline* outline, |
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596 FT_Raster_Params* params ) |
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597 { |
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598 FT_Error error; |
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599 FT_Bool update = FALSE; |
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600 FT_Renderer renderer; |
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601 FT_ListNode node; |
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602 |
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603 |
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604 if ( !library ) |
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605 return FT_Err_Invalid_Library_Handle; |
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606 |
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607 if ( !outline || !params ) |
|
608 return FT_Err_Invalid_Argument; |
|
609 |
|
610 renderer = library->cur_renderer; |
|
611 node = library->renderers.head; |
|
612 |
|
613 params->source = (void*)outline; |
|
614 |
|
615 error = FT_Err_Cannot_Render_Glyph; |
|
616 while ( renderer ) |
|
617 { |
|
618 error = renderer->raster_render( renderer->raster, params ); |
|
619 if ( !error || FT_ERROR_BASE( error ) != FT_Err_Cannot_Render_Glyph ) |
|
620 break; |
|
621 |
|
622 /* FT_Err_Cannot_Render_Glyph is returned if the render mode */ |
|
623 /* is unsupported by the current renderer for this glyph image */ |
|
624 /* format */ |
|
625 |
|
626 /* now, look for another renderer that supports the same */ |
|
627 /* format */ |
|
628 renderer = FT_Lookup_Renderer( library, FT_GLYPH_FORMAT_OUTLINE, |
|
629 &node ); |
|
630 update = TRUE; |
|
631 } |
|
632 |
|
633 /* if we changed the current renderer for the glyph image format */ |
|
634 /* we need to select it as the next current one */ |
|
635 if ( !error && update && renderer ) |
|
636 FT_Set_Renderer( library, renderer, 0, 0 ); |
|
637 |
|
638 return error; |
|
639 } |
|
640 |
|
641 |
|
642 /* documentation is in ftoutln.h */ |
|
643 |
|
644 FT_EXPORT_DEF( FT_Error ) |
|
645 FT_Outline_Get_Bitmap( FT_Library library, |
|
646 FT_Outline* outline, |
|
647 const FT_Bitmap *abitmap ) |
|
648 { |
|
649 FT_Raster_Params params; |
|
650 |
|
651 |
|
652 if ( !abitmap ) |
|
653 return FT_Err_Invalid_Argument; |
|
654 |
|
655 /* other checks are delayed to FT_Outline_Render() */ |
|
656 |
|
657 params.target = abitmap; |
|
658 params.flags = 0; |
|
659 |
|
660 if ( abitmap->pixel_mode == FT_PIXEL_MODE_GRAY || |
|
661 abitmap->pixel_mode == FT_PIXEL_MODE_LCD || |
|
662 abitmap->pixel_mode == FT_PIXEL_MODE_LCD_V ) |
|
663 params.flags |= FT_RASTER_FLAG_AA; |
|
664 |
|
665 return FT_Outline_Render( library, outline, ¶ms ); |
|
666 } |
|
667 |
|
668 |
|
669 /* documentation is in freetype.h */ |
|
670 |
|
671 FT_EXPORT_DEF( void ) |
|
672 FT_Vector_Transform( FT_Vector* vector, |
|
673 const FT_Matrix* matrix ) |
|
674 { |
|
675 FT_Pos xz, yz; |
|
676 |
|
677 |
|
678 if ( !vector || !matrix ) |
|
679 return; |
|
680 |
|
681 xz = FT_MulFix( vector->x, matrix->xx ) + |
|
682 FT_MulFix( vector->y, matrix->xy ); |
|
683 |
|
684 yz = FT_MulFix( vector->x, matrix->yx ) + |
|
685 FT_MulFix( vector->y, matrix->yy ); |
|
686 |
|
687 vector->x = xz; |
|
688 vector->y = yz; |
|
689 } |
|
690 |
|
691 |
|
692 /* documentation is in ftoutln.h */ |
|
693 |
|
694 FT_EXPORT_DEF( void ) |
|
695 FT_Outline_Transform( const FT_Outline* outline, |
|
696 const FT_Matrix* matrix ) |
|
697 { |
|
698 FT_Vector* vec; |
|
699 FT_Vector* limit; |
|
700 |
|
701 |
|
702 if ( !outline || !matrix ) |
|
703 return; |
|
704 |
|
705 vec = outline->points; |
|
706 limit = vec + outline->n_points; |
|
707 |
|
708 for ( ; vec < limit; vec++ ) |
|
709 FT_Vector_Transform( vec, matrix ); |
|
710 } |
|
711 |
|
712 |
|
713 #if 0 |
|
714 |
|
715 #define FT_OUTLINE_GET_CONTOUR( outline, c, first, last ) \ |
|
716 do { \ |
|
717 (first) = ( c > 0 ) ? (outline)->points + \ |
|
718 (outline)->contours[c - 1] + 1 \ |
|
719 : (outline)->points; \ |
|
720 (last) = (outline)->points + (outline)->contours[c]; \ |
|
721 } while ( 0 ) |
|
722 |
|
723 |
|
724 /* Is a point in some contour? */ |
|
725 /* */ |
|
726 /* We treat every point of the contour as if it */ |
|
727 /* it were ON. That is, we allow false positives, */ |
|
728 /* but disallow false negatives. (XXX really?) */ |
|
729 static FT_Bool |
|
730 ft_contour_has( FT_Outline* outline, |
|
731 FT_Short c, |
|
732 FT_Vector* point ) |
|
733 { |
|
734 FT_Vector* first; |
|
735 FT_Vector* last; |
|
736 FT_Vector* a; |
|
737 FT_Vector* b; |
|
738 FT_UInt n = 0; |
|
739 |
|
740 |
|
741 FT_OUTLINE_GET_CONTOUR( outline, c, first, last ); |
|
742 |
|
743 for ( a = first; a <= last; a++ ) |
|
744 { |
|
745 FT_Pos x; |
|
746 FT_Int intersect; |
|
747 |
|
748 |
|
749 b = ( a == last ) ? first : a + 1; |
|
750 |
|
751 intersect = ( a->y - point->y ) ^ ( b->y - point->y ); |
|
752 |
|
753 /* a and b are on the same side */ |
|
754 if ( intersect >= 0 ) |
|
755 { |
|
756 if ( intersect == 0 && a->y == point->y ) |
|
757 { |
|
758 if ( ( a->x <= point->x && b->x >= point->x ) || |
|
759 ( a->x >= point->x && b->x <= point->x ) ) |
|
760 return 1; |
|
761 } |
|
762 |
|
763 continue; |
|
764 } |
|
765 |
|
766 x = a->x + ( b->x - a->x ) * (point->y - a->y ) / ( b->y - a->y ); |
|
767 |
|
768 if ( x < point->x ) |
|
769 n++; |
|
770 else if ( x == point->x ) |
|
771 return 1; |
|
772 } |
|
773 |
|
774 return ( n % 2 ); |
|
775 } |
|
776 |
|
777 |
|
778 static FT_Bool |
|
779 ft_contour_enclosed( FT_Outline* outline, |
|
780 FT_UShort c ) |
|
781 { |
|
782 FT_Vector* first; |
|
783 FT_Vector* last; |
|
784 FT_Short i; |
|
785 |
|
786 |
|
787 FT_OUTLINE_GET_CONTOUR( outline, c, first, last ); |
|
788 |
|
789 for ( i = 0; i < outline->n_contours; i++ ) |
|
790 { |
|
791 if ( i != c && ft_contour_has( outline, i, first ) ) |
|
792 { |
|
793 FT_Vector* pt; |
|
794 |
|
795 |
|
796 for ( pt = first + 1; pt <= last; pt++ ) |
|
797 if ( !ft_contour_has( outline, i, pt ) ) |
|
798 return 0; |
|
799 |
|
800 return 1; |
|
801 } |
|
802 } |
|
803 |
|
804 return 0; |
|
805 } |
|
806 |
|
807 |
|
808 /* This version differs from the public one in that each */ |
|
809 /* part (contour not enclosed in another contour) of the */ |
|
810 /* outline is checked for orientation. This is */ |
|
811 /* necessary for some buggy CJK fonts. */ |
|
812 static FT_Orientation |
|
813 ft_outline_get_orientation( FT_Outline* outline ) |
|
814 { |
|
815 FT_Short i; |
|
816 FT_Vector* first; |
|
817 FT_Vector* last; |
|
818 FT_Orientation orient = FT_ORIENTATION_NONE; |
|
819 |
|
820 |
|
821 first = outline->points; |
|
822 for ( i = 0; i < outline->n_contours; i++, first = last + 1 ) |
|
823 { |
|
824 FT_Vector* point; |
|
825 FT_Vector* xmin_point; |
|
826 FT_Pos xmin; |
|
827 |
|
828 |
|
829 last = outline->points + outline->contours[i]; |
|
830 |
|
831 /* skip degenerate contours */ |
|
832 if ( last < first + 2 ) |
|
833 continue; |
|
834 |
|
835 if ( ft_contour_enclosed( outline, i ) ) |
|
836 continue; |
|
837 |
|
838 xmin = first->x; |
|
839 xmin_point = first; |
|
840 |
|
841 for ( point = first + 1; point <= last; point++ ) |
|
842 { |
|
843 if ( point->x < xmin ) |
|
844 { |
|
845 xmin = point->x; |
|
846 xmin_point = point; |
|
847 } |
|
848 } |
|
849 |
|
850 /* check the orientation of the contour */ |
|
851 { |
|
852 FT_Vector* prev; |
|
853 FT_Vector* next; |
|
854 FT_Orientation o; |
|
855 |
|
856 |
|
857 prev = ( xmin_point == first ) ? last : xmin_point - 1; |
|
858 next = ( xmin_point == last ) ? first : xmin_point + 1; |
|
859 |
|
860 if ( FT_Atan2( prev->x - xmin_point->x, prev->y - xmin_point->y ) > |
|
861 FT_Atan2( next->x - xmin_point->x, next->y - xmin_point->y ) ) |
|
862 o = FT_ORIENTATION_POSTSCRIPT; |
|
863 else |
|
864 o = FT_ORIENTATION_TRUETYPE; |
|
865 |
|
866 if ( orient == FT_ORIENTATION_NONE ) |
|
867 orient = o; |
|
868 else if ( orient != o ) |
|
869 return FT_ORIENTATION_NONE; |
|
870 } |
|
871 } |
|
872 |
|
873 return orient; |
|
874 } |
|
875 |
|
876 #endif /* 0 */ |
|
877 |
|
878 |
|
879 /* documentation is in ftoutln.h */ |
|
880 |
|
881 FT_EXPORT_DEF( FT_Error ) |
|
882 FT_Outline_Embolden( FT_Outline* outline, |
|
883 FT_Pos strength ) |
|
884 { |
|
885 FT_Vector* points; |
|
886 FT_Vector v_prev, v_first, v_next, v_cur; |
|
887 FT_Angle rotate, angle_in, angle_out; |
|
888 FT_Int c, n, first; |
|
889 FT_Int orientation; |
|
890 |
|
891 |
|
892 if ( !outline ) |
|
893 return FT_Err_Invalid_Argument; |
|
894 |
|
895 strength /= 2; |
|
896 if ( strength == 0 ) |
|
897 return FT_Err_Ok; |
|
898 |
|
899 orientation = FT_Outline_Get_Orientation( outline ); |
|
900 if ( orientation == FT_ORIENTATION_NONE ) |
|
901 { |
|
902 if ( outline->n_contours ) |
|
903 return FT_Err_Invalid_Argument; |
|
904 else |
|
905 return FT_Err_Ok; |
|
906 } |
|
907 |
|
908 if ( orientation == FT_ORIENTATION_TRUETYPE ) |
|
909 rotate = -FT_ANGLE_PI2; |
|
910 else |
|
911 rotate = FT_ANGLE_PI2; |
|
912 |
|
913 points = outline->points; |
|
914 |
|
915 first = 0; |
|
916 for ( c = 0; c < outline->n_contours; c++ ) |
|
917 { |
|
918 int last = outline->contours[c]; |
|
919 |
|
920 |
|
921 v_first = points[first]; |
|
922 v_prev = points[last]; |
|
923 v_cur = v_first; |
|
924 |
|
925 for ( n = first; n <= last; n++ ) |
|
926 { |
|
927 FT_Vector in, out; |
|
928 FT_Angle angle_diff; |
|
929 FT_Pos d; |
|
930 FT_Fixed scale; |
|
931 |
|
932 |
|
933 if ( n < last ) |
|
934 v_next = points[n + 1]; |
|
935 else |
|
936 v_next = v_first; |
|
937 |
|
938 /* compute the in and out vectors */ |
|
939 in.x = v_cur.x - v_prev.x; |
|
940 in.y = v_cur.y - v_prev.y; |
|
941 |
|
942 out.x = v_next.x - v_cur.x; |
|
943 out.y = v_next.y - v_cur.y; |
|
944 |
|
945 angle_in = FT_Atan2( in.x, in.y ); |
|
946 angle_out = FT_Atan2( out.x, out.y ); |
|
947 angle_diff = FT_Angle_Diff( angle_in, angle_out ); |
|
948 scale = FT_Cos( angle_diff / 2 ); |
|
949 |
|
950 if ( scale < 0x4000L && scale > -0x4000L ) |
|
951 in.x = in.y = 0; |
|
952 else |
|
953 { |
|
954 d = FT_DivFix( strength, scale ); |
|
955 |
|
956 FT_Vector_From_Polar( &in, d, angle_in + angle_diff / 2 - rotate ); |
|
957 } |
|
958 |
|
959 outline->points[n].x = v_cur.x + strength + in.x; |
|
960 outline->points[n].y = v_cur.y + strength + in.y; |
|
961 |
|
962 v_prev = v_cur; |
|
963 v_cur = v_next; |
|
964 } |
|
965 |
|
966 first = last + 1; |
|
967 } |
|
968 |
|
969 return FT_Err_Ok; |
|
970 } |
|
971 |
|
972 |
|
973 /* documentation is in ftoutln.h */ |
|
974 |
|
975 FT_EXPORT_DEF( FT_Orientation ) |
|
976 FT_Outline_Get_Orientation( FT_Outline* outline ) |
|
977 { |
|
978 FT_Pos xmin = 32768L; |
|
979 FT_Pos xmin_ymin = 32768L; |
|
980 FT_Pos xmin_ymax = -32768L; |
|
981 FT_Vector* xmin_first = NULL; |
|
982 FT_Vector* xmin_last = NULL; |
|
983 |
|
984 short* contour; |
|
985 |
|
986 FT_Vector* first; |
|
987 FT_Vector* last; |
|
988 FT_Vector* prev; |
|
989 FT_Vector* point; |
|
990 |
|
991 int i; |
|
992 FT_Pos ray_y[3]; |
|
993 FT_Orientation result[3] = |
|
994 { FT_ORIENTATION_NONE, FT_ORIENTATION_NONE, FT_ORIENTATION_NONE }; |
|
995 |
|
996 |
|
997 if ( !outline || outline->n_points <= 0 ) |
|
998 return FT_ORIENTATION_TRUETYPE; |
|
999 |
|
1000 /* We use the nonzero winding rule to find the orientation. */ |
|
1001 /* Since glyph outlines behave much more `regular' than arbitrary */ |
|
1002 /* cubic or quadratic curves, this test deals with the polygon */ |
|
1003 /* only which is spanned up by the control points. */ |
|
1004 |
|
1005 first = outline->points; |
|
1006 for ( contour = outline->contours; |
|
1007 contour < outline->contours + outline->n_contours; |
|
1008 contour++, first = last + 1 ) |
|
1009 { |
|
1010 FT_Pos contour_xmin = 32768L; |
|
1011 FT_Pos contour_xmax = -32768L; |
|
1012 FT_Pos contour_ymin = 32768L; |
|
1013 FT_Pos contour_ymax = -32768L; |
|
1014 |
|
1015 |
|
1016 last = outline->points + *contour; |
|
1017 |
|
1018 /* skip degenerate contours */ |
|
1019 if ( last < first + 2 ) |
|
1020 continue; |
|
1021 |
|
1022 for ( point = first; point <= last; ++point ) |
|
1023 { |
|
1024 if ( point->x < contour_xmin ) |
|
1025 contour_xmin = point->x; |
|
1026 |
|
1027 if ( point->x > contour_xmax ) |
|
1028 contour_xmax = point->x; |
|
1029 |
|
1030 if ( point->y < contour_ymin ) |
|
1031 contour_ymin = point->y; |
|
1032 |
|
1033 if ( point->y > contour_ymax ) |
|
1034 contour_ymax = point->y; |
|
1035 } |
|
1036 |
|
1037 if ( contour_xmin < xmin && |
|
1038 contour_xmin != contour_xmax && |
|
1039 contour_ymin != contour_ymax ) |
|
1040 { |
|
1041 xmin = contour_xmin; |
|
1042 xmin_ymin = contour_ymin; |
|
1043 xmin_ymax = contour_ymax; |
|
1044 xmin_first = first; |
|
1045 xmin_last = last; |
|
1046 } |
|
1047 } |
|
1048 |
|
1049 if ( xmin == 32768L ) |
|
1050 return FT_ORIENTATION_TRUETYPE; |
|
1051 |
|
1052 ray_y[0] = ( xmin_ymin * 3 + xmin_ymax ) >> 2; |
|
1053 ray_y[1] = ( xmin_ymin + xmin_ymax ) >> 1; |
|
1054 ray_y[2] = ( xmin_ymin + xmin_ymax * 3 ) >> 2; |
|
1055 |
|
1056 for ( i = 0; i < 3; i++ ) |
|
1057 { |
|
1058 FT_Pos left_x; |
|
1059 FT_Pos right_x; |
|
1060 FT_Vector* left1; |
|
1061 FT_Vector* left2; |
|
1062 FT_Vector* right1; |
|
1063 FT_Vector* right2; |
|
1064 |
|
1065 |
|
1066 RedoRay: |
|
1067 left_x = 32768L; |
|
1068 right_x = -32768L; |
|
1069 |
|
1070 left1 = left2 = right1 = right2 = NULL; |
|
1071 |
|
1072 prev = xmin_last; |
|
1073 for ( point = xmin_first; point <= xmin_last; prev = point, ++point ) |
|
1074 { |
|
1075 FT_Pos tmp_x; |
|
1076 |
|
1077 |
|
1078 if ( point->y == ray_y[i] || prev->y == ray_y[i] ) |
|
1079 { |
|
1080 ray_y[i]++; |
|
1081 goto RedoRay; |
|
1082 } |
|
1083 |
|
1084 if ( ( point->y < ray_y[i] && prev->y < ray_y[i] ) || |
|
1085 ( point->y > ray_y[i] && prev->y > ray_y[i] ) ) |
|
1086 continue; |
|
1087 |
|
1088 tmp_x = FT_MulDiv( point->x - prev->x, |
|
1089 ray_y[i] - prev->y, |
|
1090 point->y - prev->y ) + prev->x; |
|
1091 |
|
1092 if ( tmp_x < left_x ) |
|
1093 { |
|
1094 left_x = tmp_x; |
|
1095 left1 = prev; |
|
1096 left2 = point; |
|
1097 } |
|
1098 |
|
1099 if ( tmp_x > right_x ) |
|
1100 { |
|
1101 right_x = tmp_x; |
|
1102 right1 = prev; |
|
1103 right2 = point; |
|
1104 } |
|
1105 } |
|
1106 |
|
1107 if ( left1 && right1 ) |
|
1108 { |
|
1109 if ( left1->y < left2->y && right1->y > right2->y ) |
|
1110 result[i] = FT_ORIENTATION_TRUETYPE; |
|
1111 else if ( left1->y > left2->y && right1->y < right2->y ) |
|
1112 result[i] = FT_ORIENTATION_POSTSCRIPT; |
|
1113 else |
|
1114 result[i] = FT_ORIENTATION_NONE; |
|
1115 } |
|
1116 } |
|
1117 |
|
1118 if ( result[0] != FT_ORIENTATION_NONE && |
|
1119 ( result[0] == result[1] || result[0] == result[2] ) ) |
|
1120 return result[0]; |
|
1121 |
|
1122 if ( result[1] != FT_ORIENTATION_NONE && result[1] == result[2] ) |
|
1123 return result[1]; |
|
1124 |
|
1125 return FT_ORIENTATION_TRUETYPE; |
|
1126 } |
|
1127 |
|
1128 |
|
1129 /* END */ |
|