6 /* glyph entry, one drawing command */
7 typedef struct gentry {
8 /* this list links all GENTRYs of a GLYPH sequentially */
9 struct gentry *next; /* double linked list */
12 /* this list links all GENTRYs of one contour -
13 * of types GE_LINE and GE_CURVE only
14 * bkwd is also reused: in the very first entry (normally
15 * of type GE_MOVE) it points to g->entries
17 struct gentry *cntr[2]; /* double-linked circular list */
18 /* convenience handles */
22 /* various extended structures used at some stage of transformation */
27 int val[2][3]; /* integer values */
30 double val[2][3]; /* floating values */
32 } points; /* absolute values, NOT deltas */
33 /* convenience handles */
34 #define ipoints points.i.val
35 #define fpoints points.f.val
36 #define ixn ipoints[0]
37 #define iyn ipoints[1]
38 #define fxn fpoints[0]
39 #define fyn fpoints[1]
54 #define GEF_FLOAT 0x02 /* entry contains floating point data */
55 #define GEF_LINE 0x04 /* entry looks like a line even if it's a curve */
57 unsigned char dir; /* used to temporarily store the values for
58 * the directions of the ends of curves */
60 #define CVDIR_FUP 0x02 /* goes over the line connecting the ends */
61 #define CVDIR_FEQUAL 0x01 /* coincides with the line connecting the
63 #define CVDIR_FDOWN 0x00 /* goes under the line connecting the ends */
64 #define CVDIR_FRONT 0x0F /* mask of all front directions */
66 #define CVDIR_RSAME 0x30 /* is the same as for the front end */
67 #define CVDIR_RUP 0x20 /* goes over the line connecting the ends */
68 #define CVDIR_REQUAL 0x10 /* coincides with the line connecting the
70 #define CVDIR_RDOWN 0x00 /* goes under the line connecting the ends */
71 #define CVDIR_REAR 0xF0 /* mask of all rear directions */
73 signed char stemid; /* connection to the substituted stem group */
81 /* indexes of the points to be used for calculation of the tangents */
82 signed char ftg; /* front tangent */
83 signed char rtg; /* rear tangent, -1 means "idx 2 of the previous entry" */
86 /* stem structure, describes one [hv]stem */
87 /* acually, it describes one border of a stem */
88 /* the whole stem is a pair of these structures */
91 short value; /* value of X or Y coordinate */
92 short origin; /* point of origin for curve stems */
93 GENTRY *ge; /* entry that has (value, origin) as its first dot */
94 /* also for all the stems the couple (value, origin)
95 * is used to determine whether a stem is relevant for a
96 * line, it's considered revelant if this tuple is
97 * equal to any of the ends of the line.
98 * ge is also used to resolve ambiguity if there is more than
99 * one line going through certain pointi, it is used to
100 * distinguish these lines.
103 short from, to; /* values of other coordinate between
104 * which this stem is valid */
107 /* ordering of ST_END, ST_FLAT, ST_ZONE is IMPORTANT for sorting */
108 #define ST_END 0x01 /* end of line, lowest priority */
109 #define ST_FLAT 0x02 /* stem is defined by a flat line, not a
111 #define ST_ZONE 0x04 /* pseudo-stem, the limit of a blue zone */
112 #define ST_UP 0x08 /* the black area is to up or right from
114 #define ST_3 0x20 /* first stem of [hv]stem3 */
115 #define ST_BLUE 0x40 /* stem is in blue zone */
116 #define ST_TOPZONE 0x80 /* 1 - top zone, 0 - bottom zone */
117 #define ST_VERT 0x100 /* vertical stem (used in substitutions) */
120 #define MAX_STEMS 2000 /* we can't have more stems than path
121 * elements (or hope so) */
122 #define NSTEMGRP 50 /* maximal number of the substituted stem groups */
124 /* structure for economical representation of the
128 typedef struct stembounds {
129 short low; /* low bound */
130 short high; /* high bound */
131 char isvert; /* 1 - vertical, 0 - horizontal */
132 char already; /* temp. flag: is aleready included */
136 unsigned id; /* ID of the second glyph */
137 int val; /* kerning value */
140 typedef struct contour {
142 short inside; /* inside which contour */
148 typedef struct glyph {
149 int char_no;/* Encoding of glyph */
150 int orig_code;/* code of glyph in the font's original encoding */
151 char *name; /* Postscript name of glyph */
152 int xMin, yMin, xMax, yMax; /* values from TTF dictionary */
153 int lsb; /* left sidebearing */
154 int ttf_pathlen; /* total length of TTF paths */
157 #define GF_USED 0x0001 /* whether is this glyph used in T1 font */
158 #define GF_FLOAT 0x0002 /* thys glyph contains floating point entries */
160 GENTRY *entries;/* doube linked list of entries */
161 GENTRY *lastentry; /* the last inserted entry */
162 GENTRY *path; /* beggining of the last path */
163 int oldwidth; /* actually also scaled */
165 #define MAXLEGALWIDTH 10000
167 struct kern *kern; /* kerning data */
168 int kerncount; /* number of kerning pairs */
169 int kernalloc; /* for how many pairs we have space */
171 STEM *hstems; /* global horiz. and vert. stems */
173 int nhs, nvs; /* numbers of stems */
175 STEMBOUNDS *sbstems; /* substituted stems for all the groups */
176 short *nsbs; /* indexes of the group ends in the common array */
177 int nsg; /* actual number of the stem groups */
178 int firstsubr; /* first substistuted stems subroutine number */
180 CONTOUR *contours; /* it is not used now */
183 int rymin, rymax; /* real values */
184 /* do we have flat surfaces on top/bottom */
185 char flatymin, flatymax;
189 /* description of a dot for calculation of its distance to a curve */
192 double p[2 /*X,Y*/]; /* coordinates of a dot */
193 double dist2; /* squared distance from the dot to the curve */
194 short seg; /* the closest segment of the curve */
197 extern int stdhw, stdvw; /* dominant stems widths */
198 extern int stemsnaph[12], stemsnapv[12]; /* most typical stem width */
200 extern int bluevalues[14];
202 extern int otherblues[10];
204 extern int bbox[4]; /* the FontBBox array */
205 extern double italic_angle;
207 extern GLYPH *glyph_list;
208 extern int encoding[]; /* inverse of glyph[].char_no */
210 /* prototypes of functions */
211 void rmoveto( int dx, int dy);
212 void rlineto( int dx, int dy);
213 void rrcurveto( int dx1, int dy1, int dx2, int dy2, int dx3, int dy3);
214 void assertpath( GENTRY * from, char *file, int line, char *name);
216 void fg_rmoveto( GLYPH * g, double x, double y);
217 void ig_rmoveto( GLYPH * g, int x, int y);
218 void fg_rlineto( GLYPH * g, double x, double y);
219 void ig_rlineto( GLYPH * g, int x, int y);
220 void fg_rrcurveto( GLYPH * g, double x1, double y1,
221 double x2, double y2, double x3, double y3);
222 void ig_rrcurveto( GLYPH * g, int x1, int y1,
223 int x2, int y2, int x3, int y3);
224 void g_closepath( GLYPH * g);
226 void pathtoint( GLYPH *g);
227 void ffixquadrants( GLYPH *g);
228 void flattencurves( GLYPH * g);
229 int checkcv( GENTRY * ge, int dx, int dy);
230 void iclosepaths( GLYPH * g);
231 void fclosepaths( GLYPH * g);
232 void smoothjoints( GLYPH * g);
233 void buildstems( GLYPH * g);
234 void fstraighten( GLYPH * g);
235 void istraighten( GLYPH * g, int zigonly);
236 void isplitzigzags( GLYPH * g);
237 void fsplitzigzags( GLYPH * g);
238 void fforceconcise( GLYPH * g);
239 void iforceconcise( GLYPH * g);
240 void reversepathsfromto( GENTRY * from, GENTRY * to);
241 void reversepaths( GLYPH * g);
242 void dumppaths( GLYPH * g, GENTRY *start, GENTRY *end);
243 void print_glyph( int glyphno);
244 int print_glyph_subs( int glyphno, int startid);
245 void print_glyph_metrics( int code, int glyphno);
246 void findblues(void);
247 void stemstatistics(void);
248 void docorrectwidth(void);
249 void addkernpair( unsigned id1, unsigned id2, int unscval);
250 void print_kerning( FILE *afm_file);
252 int fcrossrayscv( double curve[4][2], double *max1, double *max2);
253 int fcrossraysge( GENTRY *ge1, GENTRY *ge2, double *max1, double *max2,
254 double crossdot[2][2]);
255 double fdotsegdist2( double seg[2][2], double dot[2]);
256 double fdotcurvdist2( double curve[4][2], struct dot_dist *dots, int ndots, double *maxp);
257 void fapproxcurve( double cv[4][2], struct dot_dist *dots, int ndots);