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1 /***************************************************************************/ |
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2 /* */ |
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3 /* ftstroke.c */ |
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4 /* */ |
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5 /* FreeType path stroker (body). */ |
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6 /* */ |
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7 /* Copyright 2002-2006, 2008-2011 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_STROKER_H |
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21 #include FT_TRIGONOMETRY_H |
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22 #include FT_OUTLINE_H |
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23 #include FT_INTERNAL_MEMORY_H |
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24 #include FT_INTERNAL_DEBUG_H |
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25 #include FT_INTERNAL_OBJECTS_H |
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26 |
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27 |
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28 /* documentation is in ftstroke.h */ |
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29 |
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30 FT_EXPORT_DEF( FT_StrokerBorder ) |
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31 FT_Outline_GetInsideBorder( FT_Outline* outline ) |
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32 { |
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33 FT_Orientation o = FT_Outline_Get_Orientation( outline ); |
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34 |
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35 |
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36 return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT |
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37 : FT_STROKER_BORDER_LEFT ; |
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38 } |
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39 |
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40 |
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41 /* documentation is in ftstroke.h */ |
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42 |
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43 FT_EXPORT_DEF( FT_StrokerBorder ) |
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44 FT_Outline_GetOutsideBorder( FT_Outline* outline ) |
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45 { |
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46 FT_Orientation o = FT_Outline_Get_Orientation( outline ); |
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47 |
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48 |
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49 return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT |
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50 : FT_STROKER_BORDER_RIGHT ; |
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51 } |
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52 |
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53 |
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54 /***************************************************************************/ |
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55 /***************************************************************************/ |
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56 /***** *****/ |
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57 /***** BEZIER COMPUTATIONS *****/ |
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58 /***** *****/ |
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59 /***************************************************************************/ |
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60 /***************************************************************************/ |
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61 |
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62 #define FT_SMALL_CONIC_THRESHOLD ( FT_ANGLE_PI / 6 ) |
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63 #define FT_SMALL_CUBIC_THRESHOLD ( FT_ANGLE_PI / 6 ) |
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64 #define FT_EPSILON 2 |
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65 |
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66 #define FT_IS_SMALL( x ) ( (x) > -FT_EPSILON && (x) < FT_EPSILON ) |
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67 |
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68 |
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69 static FT_Pos |
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70 ft_pos_abs( FT_Pos x ) |
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71 { |
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72 return x >= 0 ? x : -x ; |
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73 } |
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74 |
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75 |
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76 static void |
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77 ft_conic_split( FT_Vector* base ) |
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78 { |
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79 FT_Pos a, b; |
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80 |
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81 |
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82 base[4].x = base[2].x; |
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83 b = base[1].x; |
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84 a = base[3].x = ( base[2].x + b ) / 2; |
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85 b = base[1].x = ( base[0].x + b ) / 2; |
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86 base[2].x = ( a + b ) / 2; |
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87 |
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88 base[4].y = base[2].y; |
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89 b = base[1].y; |
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90 a = base[3].y = ( base[2].y + b ) / 2; |
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91 b = base[1].y = ( base[0].y + b ) / 2; |
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92 base[2].y = ( a + b ) / 2; |
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93 } |
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94 |
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95 |
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96 static FT_Bool |
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97 ft_conic_is_small_enough( FT_Vector* base, |
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98 FT_Angle *angle_in, |
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99 FT_Angle *angle_out ) |
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100 { |
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101 FT_Vector d1, d2; |
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102 FT_Angle theta; |
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103 FT_Int close1, close2; |
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104 |
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105 |
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106 d1.x = base[1].x - base[2].x; |
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107 d1.y = base[1].y - base[2].y; |
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108 d2.x = base[0].x - base[1].x; |
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109 d2.y = base[0].y - base[1].y; |
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110 |
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111 close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y ); |
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112 close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y ); |
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113 |
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114 if ( close1 ) |
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115 { |
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116 if ( close2 ) |
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117 *angle_in = *angle_out = 0; |
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118 else |
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119 *angle_in = *angle_out = FT_Atan2( d2.x, d2.y ); |
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120 } |
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121 else if ( close2 ) |
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122 { |
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123 *angle_in = *angle_out = FT_Atan2( d1.x, d1.y ); |
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124 } |
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125 else |
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126 { |
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127 *angle_in = FT_Atan2( d1.x, d1.y ); |
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128 *angle_out = FT_Atan2( d2.x, d2.y ); |
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129 } |
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130 |
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131 theta = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_out ) ); |
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132 |
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133 return FT_BOOL( theta < FT_SMALL_CONIC_THRESHOLD ); |
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134 } |
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135 |
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136 |
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137 static void |
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138 ft_cubic_split( FT_Vector* base ) |
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139 { |
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140 FT_Pos a, b, c, d; |
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141 |
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142 |
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143 base[6].x = base[3].x; |
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144 c = base[1].x; |
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145 d = base[2].x; |
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146 base[1].x = a = ( base[0].x + c ) / 2; |
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147 base[5].x = b = ( base[3].x + d ) / 2; |
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148 c = ( c + d ) / 2; |
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149 base[2].x = a = ( a + c ) / 2; |
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150 base[4].x = b = ( b + c ) / 2; |
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151 base[3].x = ( a + b ) / 2; |
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152 |
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153 base[6].y = base[3].y; |
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154 c = base[1].y; |
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155 d = base[2].y; |
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156 base[1].y = a = ( base[0].y + c ) / 2; |
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157 base[5].y = b = ( base[3].y + d ) / 2; |
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158 c = ( c + d ) / 2; |
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159 base[2].y = a = ( a + c ) / 2; |
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160 base[4].y = b = ( b + c ) / 2; |
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161 base[3].y = ( a + b ) / 2; |
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162 } |
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163 |
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164 |
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165 static FT_Bool |
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166 ft_cubic_is_small_enough( FT_Vector* base, |
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167 FT_Angle *angle_in, |
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168 FT_Angle *angle_mid, |
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169 FT_Angle *angle_out ) |
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170 { |
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171 FT_Vector d1, d2, d3; |
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172 FT_Angle theta1, theta2; |
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173 FT_Int close1, close2, close3; |
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174 |
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175 |
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176 d1.x = base[2].x - base[3].x; |
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177 d1.y = base[2].y - base[3].y; |
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178 d2.x = base[1].x - base[2].x; |
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179 d2.y = base[1].y - base[2].y; |
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180 d3.x = base[0].x - base[1].x; |
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181 d3.y = base[0].y - base[1].y; |
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182 |
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183 close1 = FT_IS_SMALL( d1.x ) && FT_IS_SMALL( d1.y ); |
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184 close2 = FT_IS_SMALL( d2.x ) && FT_IS_SMALL( d2.y ); |
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185 close3 = FT_IS_SMALL( d3.x ) && FT_IS_SMALL( d3.y ); |
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186 |
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187 if ( close1 || close3 ) |
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188 { |
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189 if ( close2 ) |
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190 { |
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191 /* basically a point */ |
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192 *angle_in = *angle_out = *angle_mid = 0; |
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193 } |
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194 else if ( close1 ) |
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195 { |
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196 *angle_in = *angle_mid = FT_Atan2( d2.x, d2.y ); |
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197 *angle_out = FT_Atan2( d3.x, d3.y ); |
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198 } |
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199 else /* close2 */ |
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200 { |
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201 *angle_in = FT_Atan2( d1.x, d1.y ); |
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202 *angle_mid = *angle_out = FT_Atan2( d2.x, d2.y ); |
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203 } |
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204 } |
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205 else if ( close2 ) |
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206 { |
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207 *angle_in = *angle_mid = FT_Atan2( d1.x, d1.y ); |
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208 *angle_out = FT_Atan2( d3.x, d3.y ); |
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209 } |
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210 else |
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211 { |
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212 *angle_in = FT_Atan2( d1.x, d1.y ); |
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213 *angle_mid = FT_Atan2( d2.x, d2.y ); |
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214 *angle_out = FT_Atan2( d3.x, d3.y ); |
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215 } |
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216 |
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217 theta1 = ft_pos_abs( FT_Angle_Diff( *angle_in, *angle_mid ) ); |
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218 theta2 = ft_pos_abs( FT_Angle_Diff( *angle_mid, *angle_out ) ); |
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219 |
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220 return FT_BOOL( theta1 < FT_SMALL_CUBIC_THRESHOLD && |
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221 theta2 < FT_SMALL_CUBIC_THRESHOLD ); |
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222 } |
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223 |
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224 |
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225 /***************************************************************************/ |
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226 /***************************************************************************/ |
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227 /***** *****/ |
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228 /***** STROKE BORDERS *****/ |
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229 /***** *****/ |
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230 /***************************************************************************/ |
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231 /***************************************************************************/ |
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232 |
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233 typedef enum FT_StrokeTags_ |
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234 { |
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235 FT_STROKE_TAG_ON = 1, /* on-curve point */ |
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236 FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */ |
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237 FT_STROKE_TAG_BEGIN = 4, /* sub-path start */ |
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238 FT_STROKE_TAG_END = 8 /* sub-path end */ |
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239 |
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240 } FT_StrokeTags; |
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241 |
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242 #define FT_STROKE_TAG_BEGIN_END (FT_STROKE_TAG_BEGIN|FT_STROKE_TAG_END) |
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243 |
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244 typedef struct FT_StrokeBorderRec_ |
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245 { |
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246 FT_UInt num_points; |
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247 FT_UInt max_points; |
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248 FT_Vector* points; |
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249 FT_Byte* tags; |
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250 FT_Bool movable; |
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251 FT_Int start; /* index of current sub-path start point */ |
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252 FT_Memory memory; |
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253 FT_Bool valid; |
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254 |
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255 } FT_StrokeBorderRec, *FT_StrokeBorder; |
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256 |
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257 |
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258 static FT_Error |
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259 ft_stroke_border_grow( FT_StrokeBorder border, |
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260 FT_UInt new_points ) |
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261 { |
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262 FT_UInt old_max = border->max_points; |
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263 FT_UInt new_max = border->num_points + new_points; |
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264 FT_Error error = FT_Err_Ok; |
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265 |
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266 |
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267 if ( new_max > old_max ) |
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268 { |
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269 FT_UInt cur_max = old_max; |
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270 FT_Memory memory = border->memory; |
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271 |
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272 |
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273 while ( cur_max < new_max ) |
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274 cur_max += ( cur_max >> 1 ) + 16; |
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275 |
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276 if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) || |
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277 FT_RENEW_ARRAY( border->tags, old_max, cur_max ) ) |
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278 goto Exit; |
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279 |
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280 border->max_points = cur_max; |
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281 } |
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282 |
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283 Exit: |
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284 return error; |
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285 } |
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286 |
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287 |
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288 static void |
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289 ft_stroke_border_close( FT_StrokeBorder border, |
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290 FT_Bool reverse ) |
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291 { |
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292 FT_UInt start = border->start; |
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293 FT_UInt count = border->num_points; |
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294 |
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295 |
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296 FT_ASSERT( border->start >= 0 ); |
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297 |
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298 /* don't record empty paths! */ |
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299 if ( count <= start + 1U ) |
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300 border->num_points = start; |
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301 else |
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302 { |
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303 /* copy the last point to the start of this sub-path, since */ |
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304 /* it contains the `adjusted' starting coordinates */ |
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305 border->num_points = --count; |
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306 border->points[start] = border->points[count]; |
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307 |
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308 if ( reverse ) |
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309 { |
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310 /* reverse the points */ |
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311 { |
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312 FT_Vector* vec1 = border->points + start + 1; |
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313 FT_Vector* vec2 = border->points + count - 1; |
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314 |
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315 |
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316 for ( ; vec1 < vec2; vec1++, vec2-- ) |
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317 { |
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318 FT_Vector tmp; |
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319 |
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320 |
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321 tmp = *vec1; |
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322 *vec1 = *vec2; |
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323 *vec2 = tmp; |
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324 } |
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325 } |
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326 |
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327 /* then the tags */ |
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328 { |
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329 FT_Byte* tag1 = border->tags + start + 1; |
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330 FT_Byte* tag2 = border->tags + count - 1; |
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331 |
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332 |
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333 for ( ; tag1 < tag2; tag1++, tag2-- ) |
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334 { |
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335 FT_Byte tmp; |
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336 |
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337 |
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338 tmp = *tag1; |
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339 *tag1 = *tag2; |
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340 *tag2 = tmp; |
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341 } |
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342 } |
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343 } |
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344 |
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345 border->tags[start ] |= FT_STROKE_TAG_BEGIN; |
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346 border->tags[count - 1] |= FT_STROKE_TAG_END; |
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347 } |
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348 |
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349 border->start = -1; |
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350 border->movable = FALSE; |
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351 } |
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352 |
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353 |
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354 static FT_Error |
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355 ft_stroke_border_lineto( FT_StrokeBorder border, |
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356 FT_Vector* to, |
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357 FT_Bool movable ) |
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358 { |
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359 FT_Error error = FT_Err_Ok; |
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360 |
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361 |
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362 FT_ASSERT( border->start >= 0 ); |
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363 |
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364 if ( border->movable ) |
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365 { |
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366 /* move last point */ |
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367 border->points[border->num_points - 1] = *to; |
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368 } |
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369 else |
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370 { |
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371 /* add one point */ |
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372 error = ft_stroke_border_grow( border, 1 ); |
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373 if ( !error ) |
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374 { |
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375 FT_Vector* vec = border->points + border->num_points; |
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376 FT_Byte* tag = border->tags + border->num_points; |
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377 |
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378 |
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379 vec[0] = *to; |
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380 tag[0] = FT_STROKE_TAG_ON; |
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381 |
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382 border->num_points += 1; |
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383 } |
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384 } |
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385 border->movable = movable; |
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386 return error; |
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387 } |
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388 |
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389 |
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390 static FT_Error |
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391 ft_stroke_border_conicto( FT_StrokeBorder border, |
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392 FT_Vector* control, |
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393 FT_Vector* to ) |
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394 { |
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395 FT_Error error; |
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396 |
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397 |
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398 FT_ASSERT( border->start >= 0 ); |
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399 |
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400 error = ft_stroke_border_grow( border, 2 ); |
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401 if ( !error ) |
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402 { |
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403 FT_Vector* vec = border->points + border->num_points; |
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404 FT_Byte* tag = border->tags + border->num_points; |
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405 |
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406 vec[0] = *control; |
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407 vec[1] = *to; |
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408 |
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409 tag[0] = 0; |
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410 tag[1] = FT_STROKE_TAG_ON; |
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411 |
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412 border->num_points += 2; |
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413 } |
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414 border->movable = FALSE; |
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415 return error; |
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416 } |
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417 |
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418 |
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419 static FT_Error |
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420 ft_stroke_border_cubicto( FT_StrokeBorder border, |
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421 FT_Vector* control1, |
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422 FT_Vector* control2, |
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423 FT_Vector* to ) |
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424 { |
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425 FT_Error error; |
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426 |
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427 |
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428 FT_ASSERT( border->start >= 0 ); |
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429 |
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430 error = ft_stroke_border_grow( border, 3 ); |
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431 if ( !error ) |
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432 { |
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433 FT_Vector* vec = border->points + border->num_points; |
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434 FT_Byte* tag = border->tags + border->num_points; |
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435 |
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436 |
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437 vec[0] = *control1; |
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438 vec[1] = *control2; |
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439 vec[2] = *to; |
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440 |
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441 tag[0] = FT_STROKE_TAG_CUBIC; |
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442 tag[1] = FT_STROKE_TAG_CUBIC; |
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443 tag[2] = FT_STROKE_TAG_ON; |
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444 |
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445 border->num_points += 3; |
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446 } |
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447 border->movable = FALSE; |
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448 return error; |
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449 } |
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450 |
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451 |
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452 #define FT_ARC_CUBIC_ANGLE ( FT_ANGLE_PI / 2 ) |
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453 |
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454 |
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455 static FT_Error |
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456 ft_stroke_border_arcto( FT_StrokeBorder border, |
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457 FT_Vector* center, |
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458 FT_Fixed radius, |
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459 FT_Angle angle_start, |
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460 FT_Angle angle_diff ) |
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461 { |
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462 FT_Angle total, angle, step, rotate, next, theta; |
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463 FT_Vector a, b, a2, b2; |
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464 FT_Fixed length; |
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465 FT_Error error = FT_Err_Ok; |
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466 |
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467 |
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468 /* compute start point */ |
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469 FT_Vector_From_Polar( &a, radius, angle_start ); |
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470 a.x += center->x; |
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471 a.y += center->y; |
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472 |
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473 total = angle_diff; |
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474 angle = angle_start; |
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475 rotate = ( angle_diff >= 0 ) ? FT_ANGLE_PI2 : -FT_ANGLE_PI2; |
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476 |
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477 while ( total != 0 ) |
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478 { |
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479 step = total; |
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480 if ( step > FT_ARC_CUBIC_ANGLE ) |
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481 step = FT_ARC_CUBIC_ANGLE; |
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482 |
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483 else if ( step < -FT_ARC_CUBIC_ANGLE ) |
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484 step = -FT_ARC_CUBIC_ANGLE; |
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485 |
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486 next = angle + step; |
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487 theta = step; |
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488 if ( theta < 0 ) |
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489 theta = -theta; |
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490 |
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491 theta >>= 1; |
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492 |
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493 /* compute end point */ |
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494 FT_Vector_From_Polar( &b, radius, next ); |
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495 b.x += center->x; |
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496 b.y += center->y; |
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497 |
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498 /* compute first and second control points */ |
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499 length = FT_MulDiv( radius, FT_Sin( theta ) * 4, |
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500 ( 0x10000L + FT_Cos( theta ) ) * 3 ); |
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501 |
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502 FT_Vector_From_Polar( &a2, length, angle + rotate ); |
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503 a2.x += a.x; |
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504 a2.y += a.y; |
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505 |
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506 FT_Vector_From_Polar( &b2, length, next - rotate ); |
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507 b2.x += b.x; |
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508 b2.y += b.y; |
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509 |
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510 /* add cubic arc */ |
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511 error = ft_stroke_border_cubicto( border, &a2, &b2, &b ); |
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512 if ( error ) |
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513 break; |
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514 |
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515 /* process the rest of the arc ?? */ |
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516 a = b; |
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517 total -= step; |
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518 angle = next; |
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519 } |
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520 |
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521 return error; |
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522 } |
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523 |
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524 |
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525 static FT_Error |
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526 ft_stroke_border_moveto( FT_StrokeBorder border, |
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527 FT_Vector* to ) |
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528 { |
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529 /* close current open path if any ? */ |
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530 if ( border->start >= 0 ) |
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531 ft_stroke_border_close( border, FALSE ); |
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532 |
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533 border->start = border->num_points; |
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534 border->movable = FALSE; |
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535 |
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536 return ft_stroke_border_lineto( border, to, FALSE ); |
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537 } |
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538 |
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539 |
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540 static void |
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541 ft_stroke_border_init( FT_StrokeBorder border, |
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542 FT_Memory memory ) |
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543 { |
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544 border->memory = memory; |
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545 border->points = NULL; |
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546 border->tags = NULL; |
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547 |
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548 border->num_points = 0; |
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549 border->max_points = 0; |
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550 border->start = -1; |
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551 border->valid = FALSE; |
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552 } |
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553 |
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554 |
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555 static void |
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556 ft_stroke_border_reset( FT_StrokeBorder border ) |
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557 { |
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558 border->num_points = 0; |
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559 border->start = -1; |
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560 border->valid = FALSE; |
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561 } |
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562 |
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563 |
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564 static void |
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565 ft_stroke_border_done( FT_StrokeBorder border ) |
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566 { |
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567 FT_Memory memory = border->memory; |
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568 |
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569 |
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570 FT_FREE( border->points ); |
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571 FT_FREE( border->tags ); |
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572 |
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573 border->num_points = 0; |
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574 border->max_points = 0; |
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575 border->start = -1; |
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576 border->valid = FALSE; |
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577 } |
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578 |
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579 |
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580 static FT_Error |
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581 ft_stroke_border_get_counts( FT_StrokeBorder border, |
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582 FT_UInt *anum_points, |
|
583 FT_UInt *anum_contours ) |
|
584 { |
|
585 FT_Error error = FT_Err_Ok; |
|
586 FT_UInt num_points = 0; |
|
587 FT_UInt num_contours = 0; |
|
588 |
|
589 FT_UInt count = border->num_points; |
|
590 FT_Vector* point = border->points; |
|
591 FT_Byte* tags = border->tags; |
|
592 FT_Int in_contour = 0; |
|
593 |
|
594 |
|
595 for ( ; count > 0; count--, num_points++, point++, tags++ ) |
|
596 { |
|
597 if ( tags[0] & FT_STROKE_TAG_BEGIN ) |
|
598 { |
|
599 if ( in_contour != 0 ) |
|
600 goto Fail; |
|
601 |
|
602 in_contour = 1; |
|
603 } |
|
604 else if ( in_contour == 0 ) |
|
605 goto Fail; |
|
606 |
|
607 if ( tags[0] & FT_STROKE_TAG_END ) |
|
608 { |
|
609 in_contour = 0; |
|
610 num_contours++; |
|
611 } |
|
612 } |
|
613 |
|
614 if ( in_contour != 0 ) |
|
615 goto Fail; |
|
616 |
|
617 border->valid = TRUE; |
|
618 |
|
619 Exit: |
|
620 *anum_points = num_points; |
|
621 *anum_contours = num_contours; |
|
622 return error; |
|
623 |
|
624 Fail: |
|
625 num_points = 0; |
|
626 num_contours = 0; |
|
627 goto Exit; |
|
628 } |
|
629 |
|
630 |
|
631 static void |
|
632 ft_stroke_border_export( FT_StrokeBorder border, |
|
633 FT_Outline* outline ) |
|
634 { |
|
635 /* copy point locations */ |
|
636 FT_ARRAY_COPY( outline->points + outline->n_points, |
|
637 border->points, |
|
638 border->num_points ); |
|
639 |
|
640 /* copy tags */ |
|
641 { |
|
642 FT_UInt count = border->num_points; |
|
643 FT_Byte* read = border->tags; |
|
644 FT_Byte* write = (FT_Byte*)outline->tags + outline->n_points; |
|
645 |
|
646 |
|
647 for ( ; count > 0; count--, read++, write++ ) |
|
648 { |
|
649 if ( *read & FT_STROKE_TAG_ON ) |
|
650 *write = FT_CURVE_TAG_ON; |
|
651 else if ( *read & FT_STROKE_TAG_CUBIC ) |
|
652 *write = FT_CURVE_TAG_CUBIC; |
|
653 else |
|
654 *write = FT_CURVE_TAG_CONIC; |
|
655 } |
|
656 } |
|
657 |
|
658 /* copy contours */ |
|
659 { |
|
660 FT_UInt count = border->num_points; |
|
661 FT_Byte* tags = border->tags; |
|
662 FT_Short* write = outline->contours + outline->n_contours; |
|
663 FT_Short idx = (FT_Short)outline->n_points; |
|
664 |
|
665 |
|
666 for ( ; count > 0; count--, tags++, idx++ ) |
|
667 { |
|
668 if ( *tags & FT_STROKE_TAG_END ) |
|
669 { |
|
670 *write++ = idx; |
|
671 outline->n_contours++; |
|
672 } |
|
673 } |
|
674 } |
|
675 |
|
676 outline->n_points = (short)( outline->n_points + border->num_points ); |
|
677 |
|
678 FT_ASSERT( FT_Outline_Check( outline ) == 0 ); |
|
679 } |
|
680 |
|
681 |
|
682 /***************************************************************************/ |
|
683 /***************************************************************************/ |
|
684 /***** *****/ |
|
685 /***** STROKER *****/ |
|
686 /***** *****/ |
|
687 /***************************************************************************/ |
|
688 /***************************************************************************/ |
|
689 |
|
690 #define FT_SIDE_TO_ROTATE( s ) ( FT_ANGLE_PI2 - (s) * FT_ANGLE_PI ) |
|
691 |
|
692 typedef struct FT_StrokerRec_ |
|
693 { |
|
694 FT_Angle angle_in; |
|
695 FT_Angle angle_out; |
|
696 FT_Vector center; |
|
697 FT_Bool first_point; |
|
698 FT_Bool subpath_open; |
|
699 FT_Angle subpath_angle; |
|
700 FT_Vector subpath_start; |
|
701 |
|
702 FT_Stroker_LineCap line_cap; |
|
703 FT_Stroker_LineJoin line_join; |
|
704 FT_Fixed miter_limit; |
|
705 FT_Fixed radius; |
|
706 |
|
707 FT_StrokeBorderRec borders[2]; |
|
708 FT_Library library; |
|
709 |
|
710 } FT_StrokerRec; |
|
711 |
|
712 |
|
713 /* documentation is in ftstroke.h */ |
|
714 |
|
715 FT_EXPORT_DEF( FT_Error ) |
|
716 FT_Stroker_New( FT_Library library, |
|
717 FT_Stroker *astroker ) |
|
718 { |
|
719 FT_Error error; |
|
720 FT_Memory memory; |
|
721 FT_Stroker stroker; |
|
722 |
|
723 |
|
724 if ( !library ) |
|
725 return FT_Err_Invalid_Argument; |
|
726 |
|
727 memory = library->memory; |
|
728 |
|
729 if ( !FT_NEW( stroker ) ) |
|
730 { |
|
731 stroker->library = library; |
|
732 |
|
733 ft_stroke_border_init( &stroker->borders[0], memory ); |
|
734 ft_stroke_border_init( &stroker->borders[1], memory ); |
|
735 } |
|
736 *astroker = stroker; |
|
737 return error; |
|
738 } |
|
739 |
|
740 |
|
741 /* documentation is in ftstroke.h */ |
|
742 |
|
743 FT_EXPORT_DEF( void ) |
|
744 FT_Stroker_Set( FT_Stroker stroker, |
|
745 FT_Fixed radius, |
|
746 FT_Stroker_LineCap line_cap, |
|
747 FT_Stroker_LineJoin line_join, |
|
748 FT_Fixed miter_limit ) |
|
749 { |
|
750 stroker->radius = radius; |
|
751 stroker->line_cap = line_cap; |
|
752 stroker->line_join = line_join; |
|
753 stroker->miter_limit = miter_limit; |
|
754 |
|
755 FT_Stroker_Rewind( stroker ); |
|
756 } |
|
757 |
|
758 |
|
759 /* documentation is in ftstroke.h */ |
|
760 |
|
761 FT_EXPORT_DEF( void ) |
|
762 FT_Stroker_Rewind( FT_Stroker stroker ) |
|
763 { |
|
764 if ( stroker ) |
|
765 { |
|
766 ft_stroke_border_reset( &stroker->borders[0] ); |
|
767 ft_stroke_border_reset( &stroker->borders[1] ); |
|
768 } |
|
769 } |
|
770 |
|
771 |
|
772 /* documentation is in ftstroke.h */ |
|
773 |
|
774 FT_EXPORT_DEF( void ) |
|
775 FT_Stroker_Done( FT_Stroker stroker ) |
|
776 { |
|
777 if ( stroker ) |
|
778 { |
|
779 FT_Memory memory = stroker->library->memory; |
|
780 |
|
781 |
|
782 ft_stroke_border_done( &stroker->borders[0] ); |
|
783 ft_stroke_border_done( &stroker->borders[1] ); |
|
784 |
|
785 stroker->library = NULL; |
|
786 FT_FREE( stroker ); |
|
787 } |
|
788 } |
|
789 |
|
790 |
|
791 /* creates a circular arc at a corner or cap */ |
|
792 static FT_Error |
|
793 ft_stroker_arcto( FT_Stroker stroker, |
|
794 FT_Int side ) |
|
795 { |
|
796 FT_Angle total, rotate; |
|
797 FT_Fixed radius = stroker->radius; |
|
798 FT_Error error = FT_Err_Ok; |
|
799 FT_StrokeBorder border = stroker->borders + side; |
|
800 |
|
801 |
|
802 rotate = FT_SIDE_TO_ROTATE( side ); |
|
803 |
|
804 total = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
|
805 if ( total == FT_ANGLE_PI ) |
|
806 total = -rotate * 2; |
|
807 |
|
808 error = ft_stroke_border_arcto( border, |
|
809 &stroker->center, |
|
810 radius, |
|
811 stroker->angle_in + rotate, |
|
812 total ); |
|
813 border->movable = FALSE; |
|
814 return error; |
|
815 } |
|
816 |
|
817 |
|
818 /* adds a cap at the end of an opened path */ |
|
819 static FT_Error |
|
820 ft_stroker_cap( FT_Stroker stroker, |
|
821 FT_Angle angle, |
|
822 FT_Int side ) |
|
823 { |
|
824 FT_Error error = FT_Err_Ok; |
|
825 |
|
826 |
|
827 if ( stroker->line_cap == FT_STROKER_LINECAP_ROUND ) |
|
828 { |
|
829 /* add a round cap */ |
|
830 stroker->angle_in = angle; |
|
831 stroker->angle_out = angle + FT_ANGLE_PI; |
|
832 error = ft_stroker_arcto( stroker, side ); |
|
833 } |
|
834 else if ( stroker->line_cap == FT_STROKER_LINECAP_SQUARE ) |
|
835 { |
|
836 /* add a square cap */ |
|
837 FT_Vector delta, delta2; |
|
838 FT_Angle rotate = FT_SIDE_TO_ROTATE( side ); |
|
839 FT_Fixed radius = stroker->radius; |
|
840 FT_StrokeBorder border = stroker->borders + side; |
|
841 |
|
842 |
|
843 FT_Vector_From_Polar( &delta2, radius, angle + rotate ); |
|
844 FT_Vector_From_Polar( &delta, radius, angle ); |
|
845 |
|
846 delta.x += stroker->center.x + delta2.x; |
|
847 delta.y += stroker->center.y + delta2.y; |
|
848 |
|
849 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
850 if ( error ) |
|
851 goto Exit; |
|
852 |
|
853 FT_Vector_From_Polar( &delta2, radius, angle - rotate ); |
|
854 FT_Vector_From_Polar( &delta, radius, angle ); |
|
855 |
|
856 delta.x += delta2.x + stroker->center.x; |
|
857 delta.y += delta2.y + stroker->center.y; |
|
858 |
|
859 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
860 } |
|
861 else if ( stroker->line_cap == FT_STROKER_LINECAP_BUTT ) |
|
862 { |
|
863 /* add a butt ending */ |
|
864 FT_Vector delta; |
|
865 FT_Angle rotate = FT_SIDE_TO_ROTATE( side ); |
|
866 FT_Fixed radius = stroker->radius; |
|
867 FT_StrokeBorder border = stroker->borders + side; |
|
868 |
|
869 |
|
870 FT_Vector_From_Polar( &delta, radius, angle + rotate ); |
|
871 |
|
872 delta.x += stroker->center.x; |
|
873 delta.y += stroker->center.y; |
|
874 |
|
875 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
876 if ( error ) |
|
877 goto Exit; |
|
878 |
|
879 FT_Vector_From_Polar( &delta, radius, angle - rotate ); |
|
880 |
|
881 delta.x += stroker->center.x; |
|
882 delta.y += stroker->center.y; |
|
883 |
|
884 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
885 } |
|
886 |
|
887 Exit: |
|
888 return error; |
|
889 } |
|
890 |
|
891 |
|
892 /* process an inside corner, i.e. compute intersection */ |
|
893 static FT_Error |
|
894 ft_stroker_inside( FT_Stroker stroker, |
|
895 FT_Int side) |
|
896 { |
|
897 FT_StrokeBorder border = stroker->borders + side; |
|
898 FT_Angle phi, theta, rotate; |
|
899 FT_Fixed length, thcos, sigma; |
|
900 FT_Vector delta; |
|
901 FT_Error error = FT_Err_Ok; |
|
902 |
|
903 |
|
904 rotate = FT_SIDE_TO_ROTATE( side ); |
|
905 |
|
906 /* compute median angle */ |
|
907 theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
|
908 if ( theta == FT_ANGLE_PI ) |
|
909 theta = rotate; |
|
910 else |
|
911 theta = theta / 2; |
|
912 |
|
913 phi = stroker->angle_in + theta; |
|
914 |
|
915 thcos = FT_Cos( theta ); |
|
916 sigma = FT_MulFix( stroker->miter_limit, thcos ); |
|
917 |
|
918 /* TODO: find better criterion to switch off the optimization */ |
|
919 if ( sigma < 0x10000L ) |
|
920 { |
|
921 FT_Vector_From_Polar( &delta, stroker->radius, |
|
922 stroker->angle_out + rotate ); |
|
923 delta.x += stroker->center.x; |
|
924 delta.y += stroker->center.y; |
|
925 border->movable = FALSE; |
|
926 } |
|
927 else |
|
928 { |
|
929 length = FT_DivFix( stroker->radius, thcos ); |
|
930 |
|
931 FT_Vector_From_Polar( &delta, length, phi + rotate ); |
|
932 delta.x += stroker->center.x; |
|
933 delta.y += stroker->center.y; |
|
934 } |
|
935 |
|
936 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
937 |
|
938 return error; |
|
939 } |
|
940 |
|
941 |
|
942 /* process an outside corner, i.e. compute bevel/miter/round */ |
|
943 static FT_Error |
|
944 ft_stroker_outside( FT_Stroker stroker, |
|
945 FT_Int side ) |
|
946 { |
|
947 FT_StrokeBorder border = stroker->borders + side; |
|
948 FT_Error error; |
|
949 FT_Angle rotate; |
|
950 |
|
951 |
|
952 if ( stroker->line_join == FT_STROKER_LINEJOIN_ROUND ) |
|
953 error = ft_stroker_arcto( stroker, side ); |
|
954 else |
|
955 { |
|
956 /* this is a mitered or beveled corner */ |
|
957 FT_Fixed sigma, radius = stroker->radius; |
|
958 FT_Angle theta, phi; |
|
959 FT_Fixed thcos; |
|
960 FT_Bool miter; |
|
961 |
|
962 |
|
963 rotate = FT_SIDE_TO_ROTATE( side ); |
|
964 miter = FT_BOOL( stroker->line_join == FT_STROKER_LINEJOIN_MITER ); |
|
965 |
|
966 theta = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
|
967 if ( theta == FT_ANGLE_PI ) |
|
968 { |
|
969 theta = rotate; |
|
970 phi = stroker->angle_in; |
|
971 } |
|
972 else |
|
973 { |
|
974 theta = theta / 2; |
|
975 phi = stroker->angle_in + theta + rotate; |
|
976 } |
|
977 |
|
978 thcos = FT_Cos( theta ); |
|
979 sigma = FT_MulFix( stroker->miter_limit, thcos ); |
|
980 |
|
981 /* FT_Sin(x) = 0 for x <= 57 */ |
|
982 if ( sigma >= 0x10000L || ft_pos_abs( theta ) <= 57 ) |
|
983 miter = FALSE; |
|
984 |
|
985 if ( miter ) /* this is a miter (broken angle) */ |
|
986 { |
|
987 FT_Vector middle, delta; |
|
988 FT_Fixed length; |
|
989 |
|
990 |
|
991 /* compute middle point */ |
|
992 FT_Vector_From_Polar( &middle, |
|
993 FT_MulFix( radius, stroker->miter_limit ), |
|
994 phi ); |
|
995 middle.x += stroker->center.x; |
|
996 middle.y += stroker->center.y; |
|
997 |
|
998 /* compute first angle point */ |
|
999 length = FT_MulFix( radius, |
|
1000 FT_DivFix( 0x10000L - sigma, |
|
1001 ft_pos_abs( FT_Sin( theta ) ) ) ); |
|
1002 |
|
1003 FT_Vector_From_Polar( &delta, length, phi + rotate ); |
|
1004 delta.x += middle.x; |
|
1005 delta.y += middle.y; |
|
1006 |
|
1007 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
1008 if ( error ) |
|
1009 goto Exit; |
|
1010 |
|
1011 /* compute second angle point */ |
|
1012 FT_Vector_From_Polar( &delta, length, phi - rotate ); |
|
1013 delta.x += middle.x; |
|
1014 delta.y += middle.y; |
|
1015 |
|
1016 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
1017 if ( error ) |
|
1018 goto Exit; |
|
1019 |
|
1020 /* finally, add a movable end point */ |
|
1021 FT_Vector_From_Polar( &delta, radius, stroker->angle_out + rotate ); |
|
1022 delta.x += stroker->center.x; |
|
1023 delta.y += stroker->center.y; |
|
1024 |
|
1025 error = ft_stroke_border_lineto( border, &delta, TRUE ); |
|
1026 } |
|
1027 |
|
1028 else /* this is a bevel (intersection) */ |
|
1029 { |
|
1030 FT_Fixed length; |
|
1031 FT_Vector delta; |
|
1032 |
|
1033 |
|
1034 length = FT_DivFix( stroker->radius, thcos ); |
|
1035 |
|
1036 FT_Vector_From_Polar( &delta, length, phi ); |
|
1037 delta.x += stroker->center.x; |
|
1038 delta.y += stroker->center.y; |
|
1039 |
|
1040 error = ft_stroke_border_lineto( border, &delta, FALSE ); |
|
1041 if ( error ) |
|
1042 goto Exit; |
|
1043 |
|
1044 /* now add end point */ |
|
1045 FT_Vector_From_Polar( &delta, stroker->radius, |
|
1046 stroker->angle_out + rotate ); |
|
1047 delta.x += stroker->center.x; |
|
1048 delta.y += stroker->center.y; |
|
1049 |
|
1050 error = ft_stroke_border_lineto( border, &delta, TRUE ); |
|
1051 } |
|
1052 } |
|
1053 |
|
1054 Exit: |
|
1055 return error; |
|
1056 } |
|
1057 |
|
1058 |
|
1059 static FT_Error |
|
1060 ft_stroker_process_corner( FT_Stroker stroker ) |
|
1061 { |
|
1062 FT_Error error = FT_Err_Ok; |
|
1063 FT_Angle turn; |
|
1064 FT_Int inside_side; |
|
1065 |
|
1066 |
|
1067 turn = FT_Angle_Diff( stroker->angle_in, stroker->angle_out ); |
|
1068 |
|
1069 /* no specific corner processing is required if the turn is 0 */ |
|
1070 if ( turn == 0 ) |
|
1071 goto Exit; |
|
1072 |
|
1073 /* when we turn to the right, the inside side is 0 */ |
|
1074 inside_side = 0; |
|
1075 |
|
1076 /* otherwise, the inside side is 1 */ |
|
1077 if ( turn < 0 ) |
|
1078 inside_side = 1; |
|
1079 |
|
1080 /* process the inside side */ |
|
1081 error = ft_stroker_inside( stroker, inside_side ); |
|
1082 if ( error ) |
|
1083 goto Exit; |
|
1084 |
|
1085 /* process the outside side */ |
|
1086 error = ft_stroker_outside( stroker, 1 - inside_side ); |
|
1087 |
|
1088 Exit: |
|
1089 return error; |
|
1090 } |
|
1091 |
|
1092 |
|
1093 /* add two points to the left and right borders corresponding to the */ |
|
1094 /* start of the subpath */ |
|
1095 static FT_Error |
|
1096 ft_stroker_subpath_start( FT_Stroker stroker, |
|
1097 FT_Angle start_angle ) |
|
1098 { |
|
1099 FT_Vector delta; |
|
1100 FT_Vector point; |
|
1101 FT_Error error; |
|
1102 FT_StrokeBorder border; |
|
1103 |
|
1104 |
|
1105 FT_Vector_From_Polar( &delta, stroker->radius, |
|
1106 start_angle + FT_ANGLE_PI2 ); |
|
1107 |
|
1108 point.x = stroker->center.x + delta.x; |
|
1109 point.y = stroker->center.y + delta.y; |
|
1110 |
|
1111 border = stroker->borders; |
|
1112 error = ft_stroke_border_moveto( border, &point ); |
|
1113 if ( error ) |
|
1114 goto Exit; |
|
1115 |
|
1116 point.x = stroker->center.x - delta.x; |
|
1117 point.y = stroker->center.y - delta.y; |
|
1118 |
|
1119 border++; |
|
1120 error = ft_stroke_border_moveto( border, &point ); |
|
1121 |
|
1122 /* save angle for last cap */ |
|
1123 stroker->subpath_angle = start_angle; |
|
1124 stroker->first_point = FALSE; |
|
1125 |
|
1126 Exit: |
|
1127 return error; |
|
1128 } |
|
1129 |
|
1130 |
|
1131 /* documentation is in ftstroke.h */ |
|
1132 |
|
1133 FT_EXPORT_DEF( FT_Error ) |
|
1134 FT_Stroker_LineTo( FT_Stroker stroker, |
|
1135 FT_Vector* to ) |
|
1136 { |
|
1137 FT_Error error = FT_Err_Ok; |
|
1138 FT_StrokeBorder border; |
|
1139 FT_Vector delta; |
|
1140 FT_Angle angle; |
|
1141 FT_Int side; |
|
1142 |
|
1143 delta.x = to->x - stroker->center.x; |
|
1144 delta.y = to->y - stroker->center.y; |
|
1145 |
|
1146 angle = FT_Atan2( delta.x, delta.y ); |
|
1147 FT_Vector_From_Polar( &delta, stroker->radius, angle + FT_ANGLE_PI2 ); |
|
1148 |
|
1149 /* process corner if necessary */ |
|
1150 if ( stroker->first_point ) |
|
1151 { |
|
1152 /* This is the first segment of a subpath. We need to */ |
|
1153 /* add a point to each border at their respective starting */ |
|
1154 /* point locations. */ |
|
1155 error = ft_stroker_subpath_start( stroker, angle ); |
|
1156 if ( error ) |
|
1157 goto Exit; |
|
1158 } |
|
1159 else |
|
1160 { |
|
1161 /* process the current corner */ |
|
1162 stroker->angle_out = angle; |
|
1163 error = ft_stroker_process_corner( stroker ); |
|
1164 if ( error ) |
|
1165 goto Exit; |
|
1166 } |
|
1167 |
|
1168 /* now add a line segment to both the `inside' and `outside' paths */ |
|
1169 |
|
1170 for ( border = stroker->borders, side = 1; side >= 0; side--, border++ ) |
|
1171 { |
|
1172 FT_Vector point; |
|
1173 |
|
1174 |
|
1175 point.x = to->x + delta.x; |
|
1176 point.y = to->y + delta.y; |
|
1177 |
|
1178 error = ft_stroke_border_lineto( border, &point, TRUE ); |
|
1179 if ( error ) |
|
1180 goto Exit; |
|
1181 |
|
1182 delta.x = -delta.x; |
|
1183 delta.y = -delta.y; |
|
1184 } |
|
1185 |
|
1186 stroker->angle_in = angle; |
|
1187 stroker->center = *to; |
|
1188 |
|
1189 Exit: |
|
1190 return error; |
|
1191 } |
|
1192 |
|
1193 |
|
1194 /* documentation is in ftstroke.h */ |
|
1195 |
|
1196 FT_EXPORT_DEF( FT_Error ) |
|
1197 FT_Stroker_ConicTo( FT_Stroker stroker, |
|
1198 FT_Vector* control, |
|
1199 FT_Vector* to ) |
|
1200 { |
|
1201 FT_Error error = FT_Err_Ok; |
|
1202 FT_Vector bez_stack[34]; |
|
1203 FT_Vector* arc; |
|
1204 FT_Vector* limit = bez_stack + 30; |
|
1205 FT_Angle start_angle; |
|
1206 FT_Bool first_arc = TRUE; |
|
1207 |
|
1208 |
|
1209 arc = bez_stack; |
|
1210 arc[0] = *to; |
|
1211 arc[1] = *control; |
|
1212 arc[2] = stroker->center; |
|
1213 |
|
1214 while ( arc >= bez_stack ) |
|
1215 { |
|
1216 FT_Angle angle_in, angle_out; |
|
1217 |
|
1218 |
|
1219 angle_in = angle_out = 0; /* remove compiler warnings */ |
|
1220 |
|
1221 if ( arc < limit && |
|
1222 !ft_conic_is_small_enough( arc, &angle_in, &angle_out ) ) |
|
1223 { |
|
1224 ft_conic_split( arc ); |
|
1225 arc += 2; |
|
1226 continue; |
|
1227 } |
|
1228 |
|
1229 if ( first_arc ) |
|
1230 { |
|
1231 first_arc = FALSE; |
|
1232 |
|
1233 start_angle = angle_in; |
|
1234 |
|
1235 /* process corner if necessary */ |
|
1236 if ( stroker->first_point ) |
|
1237 error = ft_stroker_subpath_start( stroker, start_angle ); |
|
1238 else |
|
1239 { |
|
1240 stroker->angle_out = start_angle; |
|
1241 error = ft_stroker_process_corner( stroker ); |
|
1242 } |
|
1243 } |
|
1244 |
|
1245 /* the arc's angle is small enough; we can add it directly to each */ |
|
1246 /* border */ |
|
1247 { |
|
1248 FT_Vector ctrl, end; |
|
1249 FT_Angle theta, phi, rotate; |
|
1250 FT_Fixed length; |
|
1251 FT_Int side; |
|
1252 |
|
1253 |
|
1254 theta = FT_Angle_Diff( angle_in, angle_out ) / 2; |
|
1255 phi = angle_in + theta; |
|
1256 length = FT_DivFix( stroker->radius, FT_Cos( theta ) ); |
|
1257 |
|
1258 for ( side = 0; side <= 1; side++ ) |
|
1259 { |
|
1260 rotate = FT_SIDE_TO_ROTATE( side ); |
|
1261 |
|
1262 /* compute control point */ |
|
1263 FT_Vector_From_Polar( &ctrl, length, phi + rotate ); |
|
1264 ctrl.x += arc[1].x; |
|
1265 ctrl.y += arc[1].y; |
|
1266 |
|
1267 /* compute end point */ |
|
1268 FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
|
1269 end.x += arc[0].x; |
|
1270 end.y += arc[0].y; |
|
1271 |
|
1272 error = ft_stroke_border_conicto( stroker->borders + side, |
|
1273 &ctrl, &end ); |
|
1274 if ( error ) |
|
1275 goto Exit; |
|
1276 } |
|
1277 } |
|
1278 |
|
1279 arc -= 2; |
|
1280 |
|
1281 if ( arc < bez_stack ) |
|
1282 stroker->angle_in = angle_out; |
|
1283 } |
|
1284 |
|
1285 stroker->center = *to; |
|
1286 |
|
1287 Exit: |
|
1288 return error; |
|
1289 } |
|
1290 |
|
1291 |
|
1292 /* documentation is in ftstroke.h */ |
|
1293 |
|
1294 FT_EXPORT_DEF( FT_Error ) |
|
1295 FT_Stroker_CubicTo( FT_Stroker stroker, |
|
1296 FT_Vector* control1, |
|
1297 FT_Vector* control2, |
|
1298 FT_Vector* to ) |
|
1299 { |
|
1300 FT_Error error = FT_Err_Ok; |
|
1301 FT_Vector bez_stack[37]; |
|
1302 FT_Vector* arc; |
|
1303 FT_Vector* limit = bez_stack + 32; |
|
1304 FT_Angle start_angle; |
|
1305 FT_Bool first_arc = TRUE; |
|
1306 |
|
1307 |
|
1308 arc = bez_stack; |
|
1309 arc[0] = *to; |
|
1310 arc[1] = *control2; |
|
1311 arc[2] = *control1; |
|
1312 arc[3] = stroker->center; |
|
1313 |
|
1314 while ( arc >= bez_stack ) |
|
1315 { |
|
1316 FT_Angle angle_in, angle_mid, angle_out; |
|
1317 |
|
1318 |
|
1319 /* remove compiler warnings */ |
|
1320 angle_in = angle_out = angle_mid = 0; |
|
1321 |
|
1322 if ( arc < limit && |
|
1323 !ft_cubic_is_small_enough( arc, &angle_in, |
|
1324 &angle_mid, &angle_out ) ) |
|
1325 { |
|
1326 ft_cubic_split( arc ); |
|
1327 arc += 3; |
|
1328 continue; |
|
1329 } |
|
1330 |
|
1331 if ( first_arc ) |
|
1332 { |
|
1333 first_arc = FALSE; |
|
1334 |
|
1335 /* process corner if necessary */ |
|
1336 start_angle = angle_in; |
|
1337 |
|
1338 if ( stroker->first_point ) |
|
1339 error = ft_stroker_subpath_start( stroker, start_angle ); |
|
1340 else |
|
1341 { |
|
1342 stroker->angle_out = start_angle; |
|
1343 error = ft_stroker_process_corner( stroker ); |
|
1344 } |
|
1345 if ( error ) |
|
1346 goto Exit; |
|
1347 } |
|
1348 |
|
1349 /* the arc's angle is small enough; we can add it directly to each */ |
|
1350 /* border */ |
|
1351 { |
|
1352 FT_Vector ctrl1, ctrl2, end; |
|
1353 FT_Angle theta1, phi1, theta2, phi2, rotate; |
|
1354 FT_Fixed length1, length2; |
|
1355 FT_Int side; |
|
1356 |
|
1357 |
|
1358 theta1 = ft_pos_abs( angle_mid - angle_in ) / 2; |
|
1359 theta2 = ft_pos_abs( angle_out - angle_mid ) / 2; |
|
1360 phi1 = (angle_mid + angle_in ) / 2; |
|
1361 phi2 = (angle_mid + angle_out ) / 2; |
|
1362 length1 = FT_DivFix( stroker->radius, FT_Cos( theta1 ) ); |
|
1363 length2 = FT_DivFix( stroker->radius, FT_Cos( theta2 ) ); |
|
1364 |
|
1365 for ( side = 0; side <= 1; side++ ) |
|
1366 { |
|
1367 rotate = FT_SIDE_TO_ROTATE( side ); |
|
1368 |
|
1369 /* compute control points */ |
|
1370 FT_Vector_From_Polar( &ctrl1, length1, phi1 + rotate ); |
|
1371 ctrl1.x += arc[2].x; |
|
1372 ctrl1.y += arc[2].y; |
|
1373 |
|
1374 FT_Vector_From_Polar( &ctrl2, length2, phi2 + rotate ); |
|
1375 ctrl2.x += arc[1].x; |
|
1376 ctrl2.y += arc[1].y; |
|
1377 |
|
1378 /* compute end point */ |
|
1379 FT_Vector_From_Polar( &end, stroker->radius, angle_out + rotate ); |
|
1380 end.x += arc[0].x; |
|
1381 end.y += arc[0].y; |
|
1382 |
|
1383 error = ft_stroke_border_cubicto( stroker->borders + side, |
|
1384 &ctrl1, &ctrl2, &end ); |
|
1385 if ( error ) |
|
1386 goto Exit; |
|
1387 } |
|
1388 } |
|
1389 |
|
1390 arc -= 3; |
|
1391 if ( arc < bez_stack ) |
|
1392 stroker->angle_in = angle_out; |
|
1393 } |
|
1394 |
|
1395 stroker->center = *to; |
|
1396 |
|
1397 Exit: |
|
1398 return error; |
|
1399 } |
|
1400 |
|
1401 |
|
1402 /* documentation is in ftstroke.h */ |
|
1403 |
|
1404 FT_EXPORT_DEF( FT_Error ) |
|
1405 FT_Stroker_BeginSubPath( FT_Stroker stroker, |
|
1406 FT_Vector* to, |
|
1407 FT_Bool open ) |
|
1408 { |
|
1409 /* We cannot process the first point, because there is not enough */ |
|
1410 /* information regarding its corner/cap. The latter will be processed */ |
|
1411 /* in the `FT_Stroker_EndSubPath' routine. */ |
|
1412 /* */ |
|
1413 stroker->first_point = TRUE; |
|
1414 stroker->center = *to; |
|
1415 stroker->subpath_open = open; |
|
1416 |
|
1417 /* record the subpath start point for each border */ |
|
1418 stroker->subpath_start = *to; |
|
1419 |
|
1420 return FT_Err_Ok; |
|
1421 } |
|
1422 |
|
1423 |
|
1424 static FT_Error |
|
1425 ft_stroker_add_reverse_left( FT_Stroker stroker, |
|
1426 FT_Bool open ) |
|
1427 { |
|
1428 FT_StrokeBorder right = stroker->borders + 0; |
|
1429 FT_StrokeBorder left = stroker->borders + 1; |
|
1430 FT_Int new_points; |
|
1431 FT_Error error = FT_Err_Ok; |
|
1432 |
|
1433 |
|
1434 FT_ASSERT( left->start >= 0 ); |
|
1435 |
|
1436 new_points = left->num_points - left->start; |
|
1437 if ( new_points > 0 ) |
|
1438 { |
|
1439 error = ft_stroke_border_grow( right, (FT_UInt)new_points ); |
|
1440 if ( error ) |
|
1441 goto Exit; |
|
1442 |
|
1443 { |
|
1444 FT_Vector* dst_point = right->points + right->num_points; |
|
1445 FT_Byte* dst_tag = right->tags + right->num_points; |
|
1446 FT_Vector* src_point = left->points + left->num_points - 1; |
|
1447 FT_Byte* src_tag = left->tags + left->num_points - 1; |
|
1448 |
|
1449 while ( src_point >= left->points + left->start ) |
|
1450 { |
|
1451 *dst_point = *src_point; |
|
1452 *dst_tag = *src_tag; |
|
1453 |
|
1454 if ( open ) |
|
1455 dst_tag[0] &= ~FT_STROKE_TAG_BEGIN_END; |
|
1456 else |
|
1457 { |
|
1458 FT_Byte ttag = (FT_Byte)( dst_tag[0] & FT_STROKE_TAG_BEGIN_END ); |
|
1459 |
|
1460 |
|
1461 /* switch begin/end tags if necessary */ |
|
1462 if ( ttag == FT_STROKE_TAG_BEGIN || |
|
1463 ttag == FT_STROKE_TAG_END ) |
|
1464 dst_tag[0] ^= FT_STROKE_TAG_BEGIN_END; |
|
1465 |
|
1466 } |
|
1467 |
|
1468 src_point--; |
|
1469 src_tag--; |
|
1470 dst_point++; |
|
1471 dst_tag++; |
|
1472 } |
|
1473 } |
|
1474 |
|
1475 left->num_points = left->start; |
|
1476 right->num_points += new_points; |
|
1477 |
|
1478 right->movable = FALSE; |
|
1479 left->movable = FALSE; |
|
1480 } |
|
1481 |
|
1482 Exit: |
|
1483 return error; |
|
1484 } |
|
1485 |
|
1486 |
|
1487 /* documentation is in ftstroke.h */ |
|
1488 |
|
1489 /* there's a lot of magic in this function! */ |
|
1490 FT_EXPORT_DEF( FT_Error ) |
|
1491 FT_Stroker_EndSubPath( FT_Stroker stroker ) |
|
1492 { |
|
1493 FT_Error error = FT_Err_Ok; |
|
1494 |
|
1495 |
|
1496 if ( stroker->subpath_open ) |
|
1497 { |
|
1498 FT_StrokeBorder right = stroker->borders; |
|
1499 |
|
1500 /* All right, this is an opened path, we need to add a cap between */ |
|
1501 /* right & left, add the reverse of left, then add a final cap */ |
|
1502 /* between left & right. */ |
|
1503 error = ft_stroker_cap( stroker, stroker->angle_in, 0 ); |
|
1504 if ( error ) |
|
1505 goto Exit; |
|
1506 |
|
1507 /* add reversed points from `left' to `right' */ |
|
1508 error = ft_stroker_add_reverse_left( stroker, TRUE ); |
|
1509 if ( error ) |
|
1510 goto Exit; |
|
1511 |
|
1512 /* now add the final cap */ |
|
1513 stroker->center = stroker->subpath_start; |
|
1514 error = ft_stroker_cap( stroker, |
|
1515 stroker->subpath_angle + FT_ANGLE_PI, 0 ); |
|
1516 if ( error ) |
|
1517 goto Exit; |
|
1518 |
|
1519 /* Now end the right subpath accordingly. The left one is */ |
|
1520 /* rewind and doesn't need further processing. */ |
|
1521 ft_stroke_border_close( right, FALSE ); |
|
1522 } |
|
1523 else |
|
1524 { |
|
1525 FT_Angle turn; |
|
1526 FT_Int inside_side; |
|
1527 |
|
1528 /* close the path if needed */ |
|
1529 if ( stroker->center.x != stroker->subpath_start.x || |
|
1530 stroker->center.y != stroker->subpath_start.y ) |
|
1531 { |
|
1532 error = FT_Stroker_LineTo( stroker, &stroker->subpath_start ); |
|
1533 if ( error ) |
|
1534 goto Exit; |
|
1535 } |
|
1536 |
|
1537 /* process the corner */ |
|
1538 stroker->angle_out = stroker->subpath_angle; |
|
1539 turn = FT_Angle_Diff( stroker->angle_in, |
|
1540 stroker->angle_out ); |
|
1541 |
|
1542 /* no specific corner processing is required if the turn is 0 */ |
|
1543 if ( turn != 0 ) |
|
1544 { |
|
1545 /* when we turn to the right, the inside side is 0 */ |
|
1546 inside_side = 0; |
|
1547 |
|
1548 /* otherwise, the inside side is 1 */ |
|
1549 if ( turn < 0 ) |
|
1550 inside_side = 1; |
|
1551 |
|
1552 error = ft_stroker_inside( stroker, inside_side ); |
|
1553 if ( error ) |
|
1554 goto Exit; |
|
1555 |
|
1556 /* process the outside side */ |
|
1557 error = ft_stroker_outside( stroker, 1 - inside_side ); |
|
1558 if ( error ) |
|
1559 goto Exit; |
|
1560 } |
|
1561 |
|
1562 /* then end our two subpaths */ |
|
1563 ft_stroke_border_close( stroker->borders + 0, TRUE ); |
|
1564 ft_stroke_border_close( stroker->borders + 1, FALSE ); |
|
1565 } |
|
1566 |
|
1567 Exit: |
|
1568 return error; |
|
1569 } |
|
1570 |
|
1571 |
|
1572 /* documentation is in ftstroke.h */ |
|
1573 |
|
1574 FT_EXPORT_DEF( FT_Error ) |
|
1575 FT_Stroker_GetBorderCounts( FT_Stroker stroker, |
|
1576 FT_StrokerBorder border, |
|
1577 FT_UInt *anum_points, |
|
1578 FT_UInt *anum_contours ) |
|
1579 { |
|
1580 FT_UInt num_points = 0, num_contours = 0; |
|
1581 FT_Error error; |
|
1582 |
|
1583 |
|
1584 if ( !stroker || border > 1 ) |
|
1585 { |
|
1586 error = FT_Err_Invalid_Argument; |
|
1587 goto Exit; |
|
1588 } |
|
1589 |
|
1590 error = ft_stroke_border_get_counts( stroker->borders + border, |
|
1591 &num_points, &num_contours ); |
|
1592 Exit: |
|
1593 if ( anum_points ) |
|
1594 *anum_points = num_points; |
|
1595 |
|
1596 if ( anum_contours ) |
|
1597 *anum_contours = num_contours; |
|
1598 |
|
1599 return error; |
|
1600 } |
|
1601 |
|
1602 |
|
1603 /* documentation is in ftstroke.h */ |
|
1604 |
|
1605 FT_EXPORT_DEF( FT_Error ) |
|
1606 FT_Stroker_GetCounts( FT_Stroker stroker, |
|
1607 FT_UInt *anum_points, |
|
1608 FT_UInt *anum_contours ) |
|
1609 { |
|
1610 FT_UInt count1, count2, num_points = 0; |
|
1611 FT_UInt count3, count4, num_contours = 0; |
|
1612 FT_Error error; |
|
1613 |
|
1614 |
|
1615 error = ft_stroke_border_get_counts( stroker->borders + 0, |
|
1616 &count1, &count2 ); |
|
1617 if ( error ) |
|
1618 goto Exit; |
|
1619 |
|
1620 error = ft_stroke_border_get_counts( stroker->borders + 1, |
|
1621 &count3, &count4 ); |
|
1622 if ( error ) |
|
1623 goto Exit; |
|
1624 |
|
1625 num_points = count1 + count3; |
|
1626 num_contours = count2 + count4; |
|
1627 |
|
1628 Exit: |
|
1629 *anum_points = num_points; |
|
1630 *anum_contours = num_contours; |
|
1631 return error; |
|
1632 } |
|
1633 |
|
1634 |
|
1635 /* documentation is in ftstroke.h */ |
|
1636 |
|
1637 FT_EXPORT_DEF( void ) |
|
1638 FT_Stroker_ExportBorder( FT_Stroker stroker, |
|
1639 FT_StrokerBorder border, |
|
1640 FT_Outline* outline ) |
|
1641 { |
|
1642 if ( border == FT_STROKER_BORDER_LEFT || |
|
1643 border == FT_STROKER_BORDER_RIGHT ) |
|
1644 { |
|
1645 FT_StrokeBorder sborder = & stroker->borders[border]; |
|
1646 |
|
1647 |
|
1648 if ( sborder->valid ) |
|
1649 ft_stroke_border_export( sborder, outline ); |
|
1650 } |
|
1651 } |
|
1652 |
|
1653 |
|
1654 /* documentation is in ftstroke.h */ |
|
1655 |
|
1656 FT_EXPORT_DEF( void ) |
|
1657 FT_Stroker_Export( FT_Stroker stroker, |
|
1658 FT_Outline* outline ) |
|
1659 { |
|
1660 FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_LEFT, outline ); |
|
1661 FT_Stroker_ExportBorder( stroker, FT_STROKER_BORDER_RIGHT, outline ); |
|
1662 } |
|
1663 |
|
1664 |
|
1665 /* documentation is in ftstroke.h */ |
|
1666 |
|
1667 /* |
|
1668 * The following is very similar to FT_Outline_Decompose, except |
|
1669 * that we do support opened paths, and do not scale the outline. |
|
1670 */ |
|
1671 FT_EXPORT_DEF( FT_Error ) |
|
1672 FT_Stroker_ParseOutline( FT_Stroker stroker, |
|
1673 FT_Outline* outline, |
|
1674 FT_Bool opened ) |
|
1675 { |
|
1676 FT_Vector v_last; |
|
1677 FT_Vector v_control; |
|
1678 FT_Vector v_start; |
|
1679 |
|
1680 FT_Vector* point; |
|
1681 FT_Vector* limit; |
|
1682 char* tags; |
|
1683 |
|
1684 FT_Error error; |
|
1685 |
|
1686 FT_Int n; /* index of contour in outline */ |
|
1687 FT_UInt first; /* index of first point in contour */ |
|
1688 FT_Int tag; /* current point's state */ |
|
1689 |
|
1690 |
|
1691 if ( !outline || !stroker ) |
|
1692 return FT_Err_Invalid_Argument; |
|
1693 |
|
1694 FT_Stroker_Rewind( stroker ); |
|
1695 |
|
1696 first = 0; |
|
1697 |
|
1698 for ( n = 0; n < outline->n_contours; n++ ) |
|
1699 { |
|
1700 FT_UInt last; /* index of last point in contour */ |
|
1701 |
|
1702 |
|
1703 last = outline->contours[n]; |
|
1704 limit = outline->points + last; |
|
1705 |
|
1706 /* skip empty points; we don't stroke these */ |
|
1707 if ( last <= first ) |
|
1708 { |
|
1709 first = last + 1; |
|
1710 continue; |
|
1711 } |
|
1712 |
|
1713 v_start = outline->points[first]; |
|
1714 v_last = outline->points[last]; |
|
1715 |
|
1716 v_control = v_start; |
|
1717 |
|
1718 point = outline->points + first; |
|
1719 tags = outline->tags + first; |
|
1720 tag = FT_CURVE_TAG( tags[0] ); |
|
1721 |
|
1722 /* A contour cannot start with a cubic control point! */ |
|
1723 if ( tag == FT_CURVE_TAG_CUBIC ) |
|
1724 goto Invalid_Outline; |
|
1725 |
|
1726 /* check first point to determine origin */ |
|
1727 if ( tag == FT_CURVE_TAG_CONIC ) |
|
1728 { |
|
1729 /* First point is conic control. Yes, this happens. */ |
|
1730 if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON ) |
|
1731 { |
|
1732 /* start at last point if it is on the curve */ |
|
1733 v_start = v_last; |
|
1734 limit--; |
|
1735 } |
|
1736 else |
|
1737 { |
|
1738 /* if both first and last points are conic, */ |
|
1739 /* start at their middle */ |
|
1740 v_start.x = ( v_start.x + v_last.x ) / 2; |
|
1741 v_start.y = ( v_start.y + v_last.y ) / 2; |
|
1742 } |
|
1743 point--; |
|
1744 tags--; |
|
1745 } |
|
1746 |
|
1747 error = FT_Stroker_BeginSubPath( stroker, &v_start, opened ); |
|
1748 if ( error ) |
|
1749 goto Exit; |
|
1750 |
|
1751 while ( point < limit ) |
|
1752 { |
|
1753 point++; |
|
1754 tags++; |
|
1755 |
|
1756 tag = FT_CURVE_TAG( tags[0] ); |
|
1757 switch ( tag ) |
|
1758 { |
|
1759 case FT_CURVE_TAG_ON: /* emit a single line_to */ |
|
1760 { |
|
1761 FT_Vector vec; |
|
1762 |
|
1763 |
|
1764 vec.x = point->x; |
|
1765 vec.y = point->y; |
|
1766 |
|
1767 error = FT_Stroker_LineTo( stroker, &vec ); |
|
1768 if ( error ) |
|
1769 goto Exit; |
|
1770 continue; |
|
1771 } |
|
1772 |
|
1773 case FT_CURVE_TAG_CONIC: /* consume conic arcs */ |
|
1774 v_control.x = point->x; |
|
1775 v_control.y = point->y; |
|
1776 |
|
1777 Do_Conic: |
|
1778 if ( point < limit ) |
|
1779 { |
|
1780 FT_Vector vec; |
|
1781 FT_Vector v_middle; |
|
1782 |
|
1783 |
|
1784 point++; |
|
1785 tags++; |
|
1786 tag = FT_CURVE_TAG( tags[0] ); |
|
1787 |
|
1788 vec = point[0]; |
|
1789 |
|
1790 if ( tag == FT_CURVE_TAG_ON ) |
|
1791 { |
|
1792 error = FT_Stroker_ConicTo( stroker, &v_control, &vec ); |
|
1793 if ( error ) |
|
1794 goto Exit; |
|
1795 continue; |
|
1796 } |
|
1797 |
|
1798 if ( tag != FT_CURVE_TAG_CONIC ) |
|
1799 goto Invalid_Outline; |
|
1800 |
|
1801 v_middle.x = ( v_control.x + vec.x ) / 2; |
|
1802 v_middle.y = ( v_control.y + vec.y ) / 2; |
|
1803 |
|
1804 error = FT_Stroker_ConicTo( stroker, &v_control, &v_middle ); |
|
1805 if ( error ) |
|
1806 goto Exit; |
|
1807 |
|
1808 v_control = vec; |
|
1809 goto Do_Conic; |
|
1810 } |
|
1811 |
|
1812 error = FT_Stroker_ConicTo( stroker, &v_control, &v_start ); |
|
1813 goto Close; |
|
1814 |
|
1815 default: /* FT_CURVE_TAG_CUBIC */ |
|
1816 { |
|
1817 FT_Vector vec1, vec2; |
|
1818 |
|
1819 |
|
1820 if ( point + 1 > limit || |
|
1821 FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC ) |
|
1822 goto Invalid_Outline; |
|
1823 |
|
1824 point += 2; |
|
1825 tags += 2; |
|
1826 |
|
1827 vec1 = point[-2]; |
|
1828 vec2 = point[-1]; |
|
1829 |
|
1830 if ( point <= limit ) |
|
1831 { |
|
1832 FT_Vector vec; |
|
1833 |
|
1834 |
|
1835 vec = point[0]; |
|
1836 |
|
1837 error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &vec ); |
|
1838 if ( error ) |
|
1839 goto Exit; |
|
1840 continue; |
|
1841 } |
|
1842 |
|
1843 error = FT_Stroker_CubicTo( stroker, &vec1, &vec2, &v_start ); |
|
1844 goto Close; |
|
1845 } |
|
1846 } |
|
1847 } |
|
1848 |
|
1849 Close: |
|
1850 if ( error ) |
|
1851 goto Exit; |
|
1852 |
|
1853 error = FT_Stroker_EndSubPath( stroker ); |
|
1854 if ( error ) |
|
1855 goto Exit; |
|
1856 |
|
1857 first = last + 1; |
|
1858 } |
|
1859 |
|
1860 return FT_Err_Ok; |
|
1861 |
|
1862 Exit: |
|
1863 return error; |
|
1864 |
|
1865 Invalid_Outline: |
|
1866 return FT_Err_Invalid_Outline; |
|
1867 } |
|
1868 |
|
1869 /* declare an extern to access ft_outline_glyph_class global allocated |
|
1870 in ftglyph.c, and use the FT_OUTLINE_GLYPH_CLASS_GET macro to access |
|
1871 it when FT_CONFIG_OPTION_PIC is defined */ |
|
1872 #ifndef FT_CONFIG_OPTION_PIC |
|
1873 extern const FT_Glyph_Class ft_outline_glyph_class; |
|
1874 #endif |
|
1875 #include "basepic.h" |
|
1876 |
|
1877 |
|
1878 /* documentation is in ftstroke.h */ |
|
1879 |
|
1880 FT_EXPORT_DEF( FT_Error ) |
|
1881 FT_Glyph_Stroke( FT_Glyph *pglyph, |
|
1882 FT_Stroker stroker, |
|
1883 FT_Bool destroy ) |
|
1884 { |
|
1885 FT_Error error = FT_Err_Invalid_Argument; |
|
1886 FT_Glyph glyph = NULL; |
|
1887 FT_Library library = stroker->library; |
|
1888 FT_UNUSED(library); |
|
1889 |
|
1890 if ( pglyph == NULL ) |
|
1891 goto Exit; |
|
1892 |
|
1893 glyph = *pglyph; |
|
1894 if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET ) |
|
1895 goto Exit; |
|
1896 |
|
1897 { |
|
1898 FT_Glyph copy; |
|
1899 |
|
1900 |
|
1901 error = FT_Glyph_Copy( glyph, © ); |
|
1902 if ( error ) |
|
1903 goto Exit; |
|
1904 |
|
1905 glyph = copy; |
|
1906 } |
|
1907 |
|
1908 { |
|
1909 FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph; |
|
1910 FT_Outline* outline = &oglyph->outline; |
|
1911 FT_UInt num_points, num_contours; |
|
1912 |
|
1913 |
|
1914 error = FT_Stroker_ParseOutline( stroker, outline, FALSE ); |
|
1915 if ( error ) |
|
1916 goto Fail; |
|
1917 |
|
1918 (void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours ); |
|
1919 |
|
1920 FT_Outline_Done( glyph->library, outline ); |
|
1921 |
|
1922 error = FT_Outline_New( glyph->library, |
|
1923 num_points, num_contours, outline ); |
|
1924 if ( error ) |
|
1925 goto Fail; |
|
1926 |
|
1927 outline->n_points = 0; |
|
1928 outline->n_contours = 0; |
|
1929 |
|
1930 FT_Stroker_Export( stroker, outline ); |
|
1931 } |
|
1932 |
|
1933 if ( destroy ) |
|
1934 FT_Done_Glyph( *pglyph ); |
|
1935 |
|
1936 *pglyph = glyph; |
|
1937 goto Exit; |
|
1938 |
|
1939 Fail: |
|
1940 FT_Done_Glyph( glyph ); |
|
1941 glyph = NULL; |
|
1942 |
|
1943 if ( !destroy ) |
|
1944 *pglyph = NULL; |
|
1945 |
|
1946 Exit: |
|
1947 return error; |
|
1948 } |
|
1949 |
|
1950 |
|
1951 /* documentation is in ftstroke.h */ |
|
1952 |
|
1953 FT_EXPORT_DEF( FT_Error ) |
|
1954 FT_Glyph_StrokeBorder( FT_Glyph *pglyph, |
|
1955 FT_Stroker stroker, |
|
1956 FT_Bool inside, |
|
1957 FT_Bool destroy ) |
|
1958 { |
|
1959 FT_Error error = FT_Err_Invalid_Argument; |
|
1960 FT_Glyph glyph = NULL; |
|
1961 FT_Library library = stroker->library; |
|
1962 FT_UNUSED(library); |
|
1963 |
|
1964 if ( pglyph == NULL ) |
|
1965 goto Exit; |
|
1966 |
|
1967 glyph = *pglyph; |
|
1968 if ( glyph == NULL || glyph->clazz != FT_OUTLINE_GLYPH_CLASS_GET ) |
|
1969 goto Exit; |
|
1970 |
|
1971 { |
|
1972 FT_Glyph copy; |
|
1973 |
|
1974 |
|
1975 error = FT_Glyph_Copy( glyph, © ); |
|
1976 if ( error ) |
|
1977 goto Exit; |
|
1978 |
|
1979 glyph = copy; |
|
1980 } |
|
1981 |
|
1982 { |
|
1983 FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph; |
|
1984 FT_StrokerBorder border; |
|
1985 FT_Outline* outline = &oglyph->outline; |
|
1986 FT_UInt num_points, num_contours; |
|
1987 |
|
1988 |
|
1989 border = FT_Outline_GetOutsideBorder( outline ); |
|
1990 if ( inside ) |
|
1991 { |
|
1992 if ( border == FT_STROKER_BORDER_LEFT ) |
|
1993 border = FT_STROKER_BORDER_RIGHT; |
|
1994 else |
|
1995 border = FT_STROKER_BORDER_LEFT; |
|
1996 } |
|
1997 |
|
1998 error = FT_Stroker_ParseOutline( stroker, outline, FALSE ); |
|
1999 if ( error ) |
|
2000 goto Fail; |
|
2001 |
|
2002 (void)FT_Stroker_GetBorderCounts( stroker, border, |
|
2003 &num_points, &num_contours ); |
|
2004 |
|
2005 FT_Outline_Done( glyph->library, outline ); |
|
2006 |
|
2007 error = FT_Outline_New( glyph->library, |
|
2008 num_points, |
|
2009 num_contours, |
|
2010 outline ); |
|
2011 if ( error ) |
|
2012 goto Fail; |
|
2013 |
|
2014 outline->n_points = 0; |
|
2015 outline->n_contours = 0; |
|
2016 |
|
2017 FT_Stroker_ExportBorder( stroker, border, outline ); |
|
2018 } |
|
2019 |
|
2020 if ( destroy ) |
|
2021 FT_Done_Glyph( *pglyph ); |
|
2022 |
|
2023 *pglyph = glyph; |
|
2024 goto Exit; |
|
2025 |
|
2026 Fail: |
|
2027 FT_Done_Glyph( glyph ); |
|
2028 glyph = NULL; |
|
2029 |
|
2030 if ( !destroy ) |
|
2031 *pglyph = NULL; |
|
2032 |
|
2033 Exit: |
|
2034 return error; |
|
2035 } |
|
2036 |
|
2037 |
|
2038 /* END */ |