gvsig-raster / libjni-potrace / trunk / libjni-potrace / resources / potrace-1.8 / src / backend_pdf.c @ 1780
History | View | Annotate | Download (8.89 KB)
1 | 1780 | nbrodin | /* Copyright (C) 2001-2007 Peter Selinger.
|
---|---|---|---|
2 | This file is part of Potrace. It is free software and it is covered
|
||
3 | by the GNU General Public License. See the file COPYING for details. */
|
||
4 | |||
5 | /* $Id: backend_pdf.c 147 2007-04-09 00:44:09Z selinger $ */
|
||
6 | |||
7 | /* The PDF backend of Potrace. Stream compression is optionally
|
||
8 | supplied via the functions in flate.c. */
|
||
9 | |||
10 | #include <stdio.h> |
||
11 | #include <stdarg.h> |
||
12 | #include <string.h> |
||
13 | #include <math.h> |
||
14 | #include <stdlib.h> |
||
15 | |||
16 | #include "main.h" |
||
17 | #include "backend_pdf.h" |
||
18 | #include "flate.h" |
||
19 | #include "lists.h" |
||
20 | #include "potracelib.h" |
||
21 | #include "auxiliary.h" |
||
22 | |||
23 | #ifdef HAVE_CONFIG_H
|
||
24 | #include "config.h" |
||
25 | #endif
|
||
26 | |||
27 | typedef int color_t; |
||
28 | |||
29 | #define black 0x000000 |
||
30 | #define red 0xff0000 |
||
31 | #define green 0x008000 |
||
32 | #define blue 0x0000ff |
||
33 | |||
34 | /* ---------------------------------------------------------------------- */
|
||
35 | /* auxiliary: growing arrays */
|
||
36 | |||
37 | struct intarray_s {
|
||
38 | int size;
|
||
39 | int *data;
|
||
40 | }; |
||
41 | typedef struct intarray_s intarray_t; |
||
42 | |||
43 | static inline void intarray_init(intarray_t *ar) { |
||
44 | ar->size = 0;
|
||
45 | ar->data = NULL;
|
||
46 | } |
||
47 | |||
48 | static inline void intarray_term(intarray_t *ar) { |
||
49 | free(ar->data); |
||
50 | ar->size = 0;
|
||
51 | ar->data = NULL;
|
||
52 | } |
||
53 | |||
54 | /* Set ar[n]=val. Expects n>=0. Grows array if necessary. Return 0 on
|
||
55 | success and -1 on error with errno set. */
|
||
56 | static inline int intarray_set(intarray_t *ar, int n, int val) { |
||
57 | int *p;
|
||
58 | int s;
|
||
59 | |||
60 | if (n >= ar->size) {
|
||
61 | s = n+1024;
|
||
62 | p = (int *)realloc(ar->data, s * sizeof(int)); |
||
63 | if (!p) {
|
||
64 | return -1; |
||
65 | } |
||
66 | ar->data = p; |
||
67 | ar->size = s; |
||
68 | } |
||
69 | ar->data[n] = val; |
||
70 | return 0; |
||
71 | } |
||
72 | |||
73 | /* ---------------------------------------------------------------------- */
|
||
74 | /* some global variables */
|
||
75 | |||
76 | static intarray_t xref;
|
||
77 | static int nxref = 0; |
||
78 | static intarray_t pages;
|
||
79 | static int npages; |
||
80 | static int streamofs; |
||
81 | static size_t outcount; /* output file position */ |
||
82 | |||
83 | /* ---------------------------------------------------------------------- */
|
||
84 | /* functions for interfacing with compression backend */
|
||
85 | |||
86 | /* xship: callback function that must be initialized before calling
|
||
87 | any other functions of the "ship" family. xship_file must be
|
||
88 | initialized too. */
|
||
89 | |||
90 | /* print the token to f, but filtered through a compression
|
||
91 | filter in case filter!=0 */
|
||
92 | static int (*xship)(FILE *f, int filter, char *s, int len); |
||
93 | static FILE *xship_file;
|
||
94 | |||
95 | /* ship PDF code, filtered */
|
||
96 | static int ship(const char *fmt, ...) { |
||
97 | va_list args; |
||
98 | static char buf[4096]; /* static string limit is okay here because |
||
99 | we only use constant format strings - for
|
||
100 | the same reason, it is okay to use
|
||
101 | vsprintf instead of vsnprintf below. */
|
||
102 | va_start(args, fmt); |
||
103 | vsprintf(buf, fmt, args); |
||
104 | buf[4095] = 0; |
||
105 | va_end(args); |
||
106 | |||
107 | outcount += xship(xship_file, 1, buf, strlen(buf));
|
||
108 | return 0; |
||
109 | } |
||
110 | |||
111 | /* ship PDF code, unfiltered */
|
||
112 | static int shipclear(char *fmt, ...) { |
||
113 | static char buf[4096]; |
||
114 | va_list args; |
||
115 | |||
116 | va_start(args, fmt); |
||
117 | vsprintf(buf, fmt, args); |
||
118 | buf[4095] = 0; |
||
119 | va_end(args); |
||
120 | |||
121 | outcount += xship(xship_file, 0, buf, strlen(buf));
|
||
122 | return 0; |
||
123 | } |
||
124 | |||
125 | /* set all callback functions */
|
||
126 | static void pdf_callbacks(FILE *fout) { |
||
127 | |||
128 | if (info.compress) {
|
||
129 | xship = pdf_xship; |
||
130 | } else {
|
||
131 | xship = dummy_xship; |
||
132 | } |
||
133 | xship_file = fout; |
||
134 | } |
||
135 | |||
136 | /* ---------------------------------------------------------------------- */
|
||
137 | /* PDF path-drawing auxiliary functions */
|
||
138 | |||
139 | /* coordinate quantization */
|
||
140 | static inline point_t unit(dpoint_t p) { |
||
141 | point_t q; |
||
142 | |||
143 | q.x = (long)(floor(p.x*info.unit+.5)); |
||
144 | q.y = (long)(floor(p.y*info.unit+.5)); |
||
145 | return q;
|
||
146 | } |
||
147 | |||
148 | static void pdf_coords(dpoint_t p) { |
||
149 | point_t cur = unit(p); |
||
150 | ship("%ld %ld ", cur.x, cur.y);
|
||
151 | } |
||
152 | |||
153 | static void pdf_moveto(dpoint_t p) { |
||
154 | pdf_coords(p); |
||
155 | ship("m\n");
|
||
156 | } |
||
157 | |||
158 | static void pdf_lineto(dpoint_t p) { |
||
159 | pdf_coords(p); |
||
160 | ship("l\n");
|
||
161 | } |
||
162 | |||
163 | static void pdf_curveto(dpoint_t p1, dpoint_t p2, dpoint_t p3) { |
||
164 | point_t q1, q2, q3; |
||
165 | |||
166 | q1 = unit(p1); |
||
167 | q2 = unit(p2); |
||
168 | q3 = unit(p3); |
||
169 | |||
170 | ship("%ld %ld %ld %ld %ld %ld c\n", q1.x, q1.y, q2.x, q2.y, q3.x, q3.y);
|
||
171 | } |
||
172 | |||
173 | /* this procedure returns a statically allocated string */
|
||
174 | static char *pdf_colorstring(const color_t col) { |
||
175 | double r, g, b;
|
||
176 | static char buf[100]; |
||
177 | |||
178 | r = (col & 0xff0000) >> 16; |
||
179 | g = (col & 0x00ff00) >> 8; |
||
180 | b = (col & 0x0000ff) >> 0; |
||
181 | |||
182 | if (r==0 && g==0 && b==0) { |
||
183 | return "0 g"; |
||
184 | } else if (r==255 && g==255 && b==255) { |
||
185 | return "1 g"; |
||
186 | } else if (r == g && g == b) { |
||
187 | sprintf(buf, "%.3f g", r/255.0); |
||
188 | return buf;
|
||
189 | } else {
|
||
190 | sprintf(buf, "%.3f %.3f %.3f rg", r/255.0, g/255.0, b/255.0); |
||
191 | return buf;
|
||
192 | } |
||
193 | } |
||
194 | |||
195 | static color_t pdf_color = -1; |
||
196 | static double pdf_width = -1; |
||
197 | |||
198 | static void pdf_setcolor(const color_t col) { |
||
199 | if (col == pdf_color) {
|
||
200 | return;
|
||
201 | } |
||
202 | pdf_color = col; |
||
203 | |||
204 | ship("%s\n", pdf_colorstring(col));
|
||
205 | } |
||
206 | |||
207 | /* explicit encoding, does not use special macros */
|
||
208 | static int pdf_path(potrace_curve_t *curve) { |
||
209 | int i;
|
||
210 | dpoint_t *c; |
||
211 | int m = curve->n;
|
||
212 | |||
213 | c = curve->c[m-1];
|
||
214 | pdf_moveto(c[2]);
|
||
215 | |||
216 | for (i=0; i<m; i++) { |
||
217 | c = curve->c[i]; |
||
218 | switch (curve->tag[i]) {
|
||
219 | case POTRACE_CORNER:
|
||
220 | pdf_lineto(c[1]);
|
||
221 | pdf_lineto(c[2]);
|
||
222 | break;
|
||
223 | case POTRACE_CURVETO:
|
||
224 | pdf_curveto(c[0], c[1], c[2]); |
||
225 | break;
|
||
226 | } |
||
227 | } |
||
228 | return 0; |
||
229 | } |
||
230 | |||
231 | /* ---------------------------------------------------------------------- */
|
||
232 | /* Backends for various types of output. */
|
||
233 | |||
234 | /* Normal output: black on transparent */
|
||
235 | static int render0(potrace_path_t *plist) { |
||
236 | potrace_path_t *p; |
||
237 | |||
238 | pdf_setcolor(info.color); |
||
239 | list_forall (p, plist) { |
||
240 | pdf_path(&p->curve); |
||
241 | ship("h\n");
|
||
242 | if (p->next == NULL || p->next->sign == '+') { |
||
243 | ship("f\n");
|
||
244 | } |
||
245 | } |
||
246 | return 0; |
||
247 | } |
||
248 | |||
249 | /* Opaque output: alternating black and white */
|
||
250 | static int render0_opaque(potrace_path_t *plist) { |
||
251 | potrace_path_t *p; |
||
252 | |||
253 | list_forall (p, plist) { |
||
254 | pdf_path(&p->curve); |
||
255 | ship("h\n");
|
||
256 | pdf_setcolor(p->sign=='+' ? info.color : info.fillcolor);
|
||
257 | ship("f\n");
|
||
258 | } |
||
259 | return 0; |
||
260 | } |
||
261 | |||
262 | /* select the appropriate rendering function from above */
|
||
263 | static int pdf_render(potrace_path_t *plist) |
||
264 | { |
||
265 | if (info.opaque) {
|
||
266 | return render0_opaque(plist);
|
||
267 | } |
||
268 | return render0(plist);
|
||
269 | } |
||
270 | |||
271 | /* ---------------------------------------------------------------------- */
|
||
272 | /* PDF header and footer */
|
||
273 | |||
274 | int init_pdf(FILE *fout)
|
||
275 | { |
||
276 | intarray_init(&xref); |
||
277 | intarray_init(&pages); |
||
278 | nxref = 0;
|
||
279 | npages = 0;
|
||
280 | |||
281 | /* set callback functions for shipping routines */
|
||
282 | pdf_callbacks(fout); |
||
283 | outcount = 0;
|
||
284 | |||
285 | shipclear("%%PDF-1.3\n");
|
||
286 | |||
287 | intarray_set(&xref, nxref++, outcount); |
||
288 | shipclear("1 0 obj\n<</Type/Catalog/Pages 3 0 R>>\nendobj\n");
|
||
289 | |||
290 | intarray_set(&xref, nxref++, outcount); |
||
291 | shipclear("2 0 obj\n"
|
||
292 | "<</Creator"
|
||
293 | "(\"POTRACE\" \"VERSION\", written by Peter Selinger 2001-2007)>>\n"
|
||
294 | "endobj\n");
|
||
295 | |||
296 | /* delay obj #3 (pages) until end */
|
||
297 | nxref++; |
||
298 | |||
299 | fflush(fout); |
||
300 | return 0; |
||
301 | } |
||
302 | |||
303 | int term_pdf(FILE *fout)
|
||
304 | { |
||
305 | int startxref;
|
||
306 | int i;
|
||
307 | |||
308 | pdf_callbacks(fout); |
||
309 | |||
310 | intarray_set(&xref, 2, outcount);
|
||
311 | shipclear("3 0 obj\n"
|
||
312 | "<</Type/Pages/Count %d/Kids[\n", npages);
|
||
313 | for (i = 0; i < npages; i++) |
||
314 | shipclear("%d 0 R\n", pages.data[i]);
|
||
315 | shipclear("]>>\nendobj\n");
|
||
316 | |||
317 | startxref = outcount; |
||
318 | |||
319 | shipclear("xref\n0 %d\n", nxref + 1); |
||
320 | shipclear("0000000000 65535 f \n");
|
||
321 | for (i = 0; i < nxref; i++) |
||
322 | shipclear("%0.10d 00000 n \n", xref.data[i]);
|
||
323 | |||
324 | shipclear("trailer\n<</Size %d/Root 1 0 R/Info 2 0 R>>\n", nxref + 1); |
||
325 | shipclear("startxref\n%d\n%%%%EOF\n", startxref);
|
||
326 | |||
327 | fflush(fout); |
||
328 | intarray_term(&xref); |
||
329 | intarray_term(&pages); |
||
330 | return 0; |
||
331 | } |
||
332 | |||
333 | static void pdf_pageinit(imginfo_t *imginfo) |
||
334 | { |
||
335 | double s, c;
|
||
336 | |||
337 | double origx = imginfo->trans.orig[0] + imginfo->lmar; |
||
338 | double origy = imginfo->trans.orig[1] + imginfo->bmar; |
||
339 | double scalex = imginfo->width / imginfo->pixwidth / info.unit;
|
||
340 | double scaley = imginfo->height / imginfo->pixheight / info.unit;
|
||
341 | int pagew = (int)ceil(imginfo->trans.bb[0]+imginfo->lmar+imginfo->rmar); |
||
342 | int pageh = (int)ceil(imginfo->trans.bb[1]+imginfo->tmar+imginfo->bmar); |
||
343 | |||
344 | pdf_color = -1;
|
||
345 | pdf_width = -1;
|
||
346 | |||
347 | intarray_set(&xref, nxref++, outcount); |
||
348 | shipclear("%d 0 obj\n", nxref);
|
||
349 | shipclear("<</Type/Page/Parent 3 0 R/Resources<</ProcSet[/PDF]>>");
|
||
350 | shipclear("/MediaBox[0 0 %d %d]", pagew, pageh);
|
||
351 | shipclear("/Contents %d 0 R>>\n", nxref + 1); |
||
352 | shipclear("endobj\n");
|
||
353 | |||
354 | intarray_set(&pages, npages++, nxref); |
||
355 | |||
356 | intarray_set(&xref, nxref++, outcount); |
||
357 | shipclear("%d 0 obj\n", nxref);
|
||
358 | if (info.compress)
|
||
359 | shipclear("<</Filter/FlateDecode/Length %d 0 R>>\n", nxref + 1); |
||
360 | else
|
||
361 | shipclear("<</Length %d 0 R>>\n", nxref + 1); |
||
362 | shipclear("stream\n");
|
||
363 | |||
364 | streamofs = outcount; |
||
365 | |||
366 | s = sin(info.angle * M_PI / 180.0); |
||
367 | c = cos(info.angle * M_PI / 180.0); |
||
368 | |||
369 | ship("%f %f %f %f %.0f %.0f cm\n", scalex*c, scalex*s, -scaley*s, scaley*c, origx, origy);
|
||
370 | } |
||
371 | |||
372 | static void pdf_pageterm(void) |
||
373 | { |
||
374 | int streamlen;
|
||
375 | |||
376 | shipclear("");
|
||
377 | |||
378 | streamlen = outcount - streamofs; |
||
379 | shipclear("endstream\nendobj\n");
|
||
380 | |||
381 | intarray_set(&xref, nxref++, outcount); |
||
382 | shipclear("%d 0 obj\n%d\nendobj\n", nxref, streamlen);
|
||
383 | } |
||
384 | |||
385 | int page_pdf(FILE *fout, potrace_path_t *plist, imginfo_t *imginfo)
|
||
386 | { |
||
387 | int r;
|
||
388 | |||
389 | pdf_callbacks(fout); |
||
390 | |||
391 | pdf_pageinit(imginfo); |
||
392 | |||
393 | r = pdf_render(plist); |
||
394 | if (r) {
|
||
395 | return r;
|
||
396 | } |
||
397 | |||
398 | pdf_pageterm(); |
||
399 | |||
400 | fflush(fout); |
||
401 | |||
402 | return 0; |
||
403 | } |