1 /***************************************************************************/ |
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2 /* */ |
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3 /* pshalgo.h */ |
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4 /* */ |
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5 /* PostScript hinting algorithm (specification). */ |
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6 /* */ |
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7 /* Copyright 2001, 2002, 2003, 2008 by */ |
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 |
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19 #ifndef __PSHALGO_H__ |
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20 #define __PSHALGO_H__ |
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21 |
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22 |
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23 #include "pshrec.h" |
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24 #include "pshglob.h" |
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25 #include FT_TRIGONOMETRY_H |
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26 |
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27 |
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28 FT_BEGIN_HEADER |
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29 |
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30 |
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31 /* handle to Hint structure */ |
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32 typedef struct PSH_HintRec_* PSH_Hint; |
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33 |
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34 /* hint bit-flags */ |
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35 typedef enum PSH_Hint_Flags_ |
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36 { |
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37 PSH_HINT_GHOST = PS_HINT_FLAG_GHOST, |
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38 PSH_HINT_BOTTOM = PS_HINT_FLAG_BOTTOM, |
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39 PSH_HINT_ACTIVE = 4, |
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40 PSH_HINT_FITTED = 8 |
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41 |
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42 } PSH_Hint_Flags; |
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43 |
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44 |
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45 #define psh_hint_is_active( x ) ( ( (x)->flags & PSH_HINT_ACTIVE ) != 0 ) |
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46 #define psh_hint_is_ghost( x ) ( ( (x)->flags & PSH_HINT_GHOST ) != 0 ) |
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47 #define psh_hint_is_fitted( x ) ( ( (x)->flags & PSH_HINT_FITTED ) != 0 ) |
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48 |
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49 #define psh_hint_activate( x ) (x)->flags |= PSH_HINT_ACTIVE |
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50 #define psh_hint_deactivate( x ) (x)->flags &= ~PSH_HINT_ACTIVE |
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51 #define psh_hint_set_fitted( x ) (x)->flags |= PSH_HINT_FITTED |
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52 |
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53 /* hint structure */ |
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54 typedef struct PSH_HintRec_ |
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55 { |
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56 FT_Int org_pos; |
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57 FT_Int org_len; |
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58 FT_Pos cur_pos; |
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59 FT_Pos cur_len; |
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60 FT_UInt flags; |
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61 PSH_Hint parent; |
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62 FT_Int order; |
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63 |
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64 } PSH_HintRec; |
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65 |
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66 |
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67 /* this is an interpolation zone used for strong points; */ |
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68 /* weak points are interpolated according to their strong */ |
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69 /* neighbours */ |
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70 typedef struct PSH_ZoneRec_ |
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71 { |
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72 FT_Fixed scale; |
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73 FT_Fixed delta; |
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74 FT_Pos min; |
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75 FT_Pos max; |
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76 |
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77 } PSH_ZoneRec, *PSH_Zone; |
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78 |
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79 |
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80 typedef struct PSH_Hint_TableRec_ |
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81 { |
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82 FT_UInt max_hints; |
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83 FT_UInt num_hints; |
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84 PSH_Hint hints; |
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85 PSH_Hint* sort; |
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86 PSH_Hint* sort_global; |
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87 FT_UInt num_zones; |
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88 PSH_ZoneRec* zones; |
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89 PSH_Zone zone; |
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90 PS_Mask_Table hint_masks; |
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91 PS_Mask_Table counter_masks; |
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92 |
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93 } PSH_Hint_TableRec, *PSH_Hint_Table; |
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94 |
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95 |
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96 typedef struct PSH_PointRec_* PSH_Point; |
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97 typedef struct PSH_ContourRec_* PSH_Contour; |
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98 |
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99 enum |
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100 { |
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101 PSH_DIR_NONE = 4, |
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102 PSH_DIR_UP = -1, |
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103 PSH_DIR_DOWN = 1, |
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104 PSH_DIR_LEFT = -2, |
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105 PSH_DIR_RIGHT = 2 |
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106 }; |
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107 |
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108 #define PSH_DIR_HORIZONTAL 2 |
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109 #define PSH_DIR_VERTICAL 1 |
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110 |
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111 #define PSH_DIR_COMPARE( d1, d2 ) ( (d1) == (d2) || (d1) == -(d2) ) |
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112 #define PSH_DIR_IS_HORIZONTAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_HORIZONTAL ) |
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113 #define PSH_DIR_IS_VERTICAL( d ) PSH_DIR_COMPARE( d, PSH_DIR_VERTICAL ) |
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114 |
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115 |
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116 /* the following bit-flags are computed once by the glyph */ |
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117 /* analyzer, for both dimensions */ |
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118 enum |
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119 { |
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120 PSH_POINT_OFF = 1, /* point is off the curve */ |
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121 PSH_POINT_SMOOTH = 2, /* point is smooth */ |
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122 PSH_POINT_INFLEX = 4 /* point is inflection */ |
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123 }; |
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124 |
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125 #define psh_point_is_smooth( p ) ( (p)->flags & PSH_POINT_SMOOTH ) |
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126 #define psh_point_is_off( p ) ( (p)->flags & PSH_POINT_OFF ) |
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127 #define psh_point_is_inflex( p ) ( (p)->flags & PSH_POINT_INFLEX ) |
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128 |
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129 #define psh_point_set_smooth( p ) (p)->flags |= PSH_POINT_SMOOTH |
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130 #define psh_point_set_off( p ) (p)->flags |= PSH_POINT_OFF |
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131 #define psh_point_set_inflex( p ) (p)->flags |= PSH_POINT_INFLEX |
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132 |
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133 /* the following bit-flags are re-computed for each dimension */ |
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134 enum |
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135 { |
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136 PSH_POINT_STRONG = 16, /* point is strong */ |
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137 PSH_POINT_FITTED = 32, /* point is already fitted */ |
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138 PSH_POINT_EXTREMUM = 64, /* point is local extremum */ |
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139 PSH_POINT_POSITIVE = 128, /* extremum has positive contour flow */ |
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140 PSH_POINT_NEGATIVE = 256, /* extremum has negative contour flow */ |
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141 PSH_POINT_EDGE_MIN = 512, /* point is aligned to left/bottom stem edge */ |
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142 PSH_POINT_EDGE_MAX = 1024 /* point is aligned to top/right stem edge */ |
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143 }; |
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144 |
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145 #define psh_point_is_strong( p ) ( (p)->flags2 & PSH_POINT_STRONG ) |
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146 #define psh_point_is_fitted( p ) ( (p)->flags2 & PSH_POINT_FITTED ) |
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147 #define psh_point_is_extremum( p ) ( (p)->flags2 & PSH_POINT_EXTREMUM ) |
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148 #define psh_point_is_positive( p ) ( (p)->flags2 & PSH_POINT_POSITIVE ) |
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149 #define psh_point_is_negative( p ) ( (p)->flags2 & PSH_POINT_NEGATIVE ) |
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150 #define psh_point_is_edge_min( p ) ( (p)->flags2 & PSH_POINT_EDGE_MIN ) |
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151 #define psh_point_is_edge_max( p ) ( (p)->flags2 & PSH_POINT_EDGE_MAX ) |
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152 |
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153 #define psh_point_set_strong( p ) (p)->flags2 |= PSH_POINT_STRONG |
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154 #define psh_point_set_fitted( p ) (p)->flags2 |= PSH_POINT_FITTED |
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155 #define psh_point_set_extremum( p ) (p)->flags2 |= PSH_POINT_EXTREMUM |
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156 #define psh_point_set_positive( p ) (p)->flags2 |= PSH_POINT_POSITIVE |
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157 #define psh_point_set_negative( p ) (p)->flags2 |= PSH_POINT_NEGATIVE |
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158 #define psh_point_set_edge_min( p ) (p)->flags2 |= PSH_POINT_EDGE_MIN |
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159 #define psh_point_set_edge_max( p ) (p)->flags2 |= PSH_POINT_EDGE_MAX |
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160 |
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161 |
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162 typedef struct PSH_PointRec_ |
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163 { |
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164 PSH_Point prev; |
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165 PSH_Point next; |
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166 PSH_Contour contour; |
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167 FT_UInt flags; |
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168 FT_UInt flags2; |
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169 FT_Char dir_in; |
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170 FT_Char dir_out; |
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171 FT_Angle angle_in; |
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172 FT_Angle angle_out; |
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173 PSH_Hint hint; |
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174 FT_Pos org_u; |
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175 FT_Pos org_v; |
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176 FT_Pos cur_u; |
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177 #ifdef DEBUG_HINTER |
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178 FT_Pos org_x; |
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179 FT_Pos cur_x; |
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180 FT_Pos org_y; |
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181 FT_Pos cur_y; |
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182 FT_UInt flags_x; |
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183 FT_UInt flags_y; |
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184 #endif |
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185 |
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186 } PSH_PointRec; |
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187 |
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188 |
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189 #define PSH_POINT_EQUAL_ORG( a, b ) ( (a)->org_u == (b)->org_u && \ |
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190 (a)->org_v == (b)->org_v ) |
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191 |
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192 #define PSH_POINT_ANGLE( a, b ) FT_Atan2( (b)->org_u - (a)->org_u, \ |
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193 (b)->org_v - (a)->org_v ) |
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194 |
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195 typedef struct PSH_ContourRec_ |
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196 { |
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197 PSH_Point start; |
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198 FT_UInt count; |
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199 |
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200 } PSH_ContourRec; |
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201 |
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202 |
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203 typedef struct PSH_GlyphRec_ |
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204 { |
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205 FT_UInt num_points; |
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206 FT_UInt num_contours; |
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207 |
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208 PSH_Point points; |
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209 PSH_Contour contours; |
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210 |
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211 FT_Memory memory; |
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212 FT_Outline* outline; |
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213 PSH_Globals globals; |
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214 PSH_Hint_TableRec hint_tables[2]; |
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215 |
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216 FT_Bool vertical; |
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217 FT_Int major_dir; |
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218 FT_Int minor_dir; |
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219 |
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220 FT_Bool do_horz_hints; |
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221 FT_Bool do_vert_hints; |
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222 FT_Bool do_horz_snapping; |
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223 FT_Bool do_vert_snapping; |
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224 FT_Bool do_stem_adjust; |
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225 |
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226 } PSH_GlyphRec, *PSH_Glyph; |
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227 |
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228 |
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229 #ifdef DEBUG_HINTER |
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230 extern PSH_Hint_Table ps_debug_hint_table; |
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231 |
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232 typedef void |
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233 (*PSH_HintFunc)( PSH_Hint hint, |
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234 FT_Bool vertical ); |
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235 |
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236 extern PSH_HintFunc ps_debug_hint_func; |
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237 |
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238 extern PSH_Glyph ps_debug_glyph; |
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239 #endif |
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240 |
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241 |
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242 extern FT_Error |
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243 ps_hints_apply( PS_Hints ps_hints, |
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244 FT_Outline* outline, |
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245 PSH_Globals globals, |
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246 FT_Render_Mode hint_mode ); |
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247 |
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248 |
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249 FT_END_HEADER |
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250 |
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251 |
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252 #endif /* __PSHALGO_H__ */ |
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253 |
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254 |
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255 /* END */ |
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