ps/ps-document.c

   1 /* Ghostscript widget for GTK/GNOME
   2  *
   3  * Copyright (C) 1998 - 2005 the Free Software Foundation
   4  *
   5  * Authors: Jonathan Blandford, Jaka Mocnik
   6  *
   7  * Based on code by: Federico Mena (Quartic), Szekeres Istvan (Pista)
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Library General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Library General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Library General Public
  20  * License along with this library; if not, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include "config.h"
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <gtk/gtk.h>
  30 #include <gtk/gtkobject.h>
  31 #include <gdk/gdkprivate.h>
  32 #include <gdk/gdkx.h>
  33 #include <gdk/gdk.h>
  34 #include <glib/gi18n.h>
  35 #include <X11/Intrinsic.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38 #include <stdlib.h>
  39 #include <errno.h>
  40 #include <sys/stat.h>
  41 #include <sys/types.h>
  42 #include <sys/wait.h>
  43 #include <stdio.h>
  44 #include <math.h>
  45
  46 #include "ps-document.h"
  47 #include "ev-debug.h"
  48 #include "gsdefaults.h"
  49 #include "ev-file-exporter.h"
  50 #include "ev-async-renderer.h"
  51
  52 #define MAX_BUFSIZE 1024
  53
  54 #define PS_DOCUMENT_IS_COMPRESSED(gs) (PS_DOCUMENT(gs)->gs_filename_unc != NULL)
  55 #define PS_DOCUMENT_GET_PS_FILE(gs)   (PS_DOCUMENT_IS_COMPRESSED(gs) ? \
  56                                        PS_DOCUMENT(gs)->gs_filename_unc : \
  57                                        PS_DOCUMENT(gs)->gs_filename)
  58
  59 /* structure to describe section of file to send to ghostscript */
  60 struct record_list
  61 {
  62         FILE *fp;
  63         long begin;
  64         guint len;
  65         gboolean seek_needed;
  66         gboolean close;
  67         struct record_list *next;
  68 };
  69
  70 static gboolean broken_pipe = FALSE;
  71
  72 /* Forward declarations */
  73 static void     ps_document_init                        (PSDocument             *gs);
  74 static void     ps_document_class_init                  (PSDocumentClass        *klass);
  75 static void     send_ps                                 (PSDocument             *gs,
  76                                                          long                    begin,
  77                                                          unsigned int            len,
  78                                                          gboolean                close);
  79 static void     output                                  (gpointer                data,
  80                                                          gint                    source,
  81                                                          GdkInputCondition       condition);
  82 static void     input                                   (gpointer                data,
  83                                                          gint                    source,
  84                                                          GdkInputCondition       condition);
  85 static void     stop_interpreter                        (PSDocument             *gs);
  86 static gint     start_interpreter                       (PSDocument             *gs);
  87 static void     ps_document_document_iface_init         (EvDocumentIface        *iface);
  88 static void     ps_document_file_exporter_iface_init    (EvFileExporterIface    *iface);
  89 static void     ps_async_renderer_iface_init            (EvAsyncRendererIface   *iface);
  90
  91 G_DEFINE_TYPE_WITH_CODE (PSDocument, ps_document, G_TYPE_OBJECT,
  92                          {
  93                                  G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT,
  94                                                         ps_document_document_iface_init);
  95                                  G_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER,
  96                                                         ps_document_file_exporter_iface_init);
  97                                  G_IMPLEMENT_INTERFACE (EV_TYPE_ASYNC_RENDERER,
  98                                                         ps_async_renderer_iface_init);
  99                          });
 100
 101 static GObjectClass *parent_class = NULL;
 102 static PSDocumentClass *gs_class = NULL;
 103
 104 static void
 105 ps_document_init (PSDocument *gs)
 106 {
 107         gs->bpixmap = NULL;
 108
 109         gs->interpreter_pid = -1;
 110
 111         gs->busy = FALSE;
 112         gs->gs_filename = 0;
 113         gs->gs_filename_unc = 0;
 114
 115         broken_pipe = FALSE;
 116
 117         gs->structured_doc = FALSE;
 118         gs->reading_from_pipe = FALSE;
 119         gs->send_filename_to_gs = FALSE;
 120
 121         gs->doc = NULL;
 122
 123         gs->interpreter_input = -1;
 124         gs->interpreter_output = -1;
 125         gs->interpreter_err = -1;
 126         gs->interpreter_input_id = 0;
 127         gs->interpreter_output_id = 0;
 128         gs->interpreter_error_id = 0;
 129
 130         gs->ps_input = NULL;
 131         gs->input_buffer = NULL;
 132         gs->input_buffer_ptr = NULL;
 133         gs->bytes_left = 0;
 134         gs->buffer_bytes_left = 0;
 135
 136         gs->gs_status = _("No document loaded.");
 137
 138         gs->ps_export_pagelist = NULL;
 139         gs->ps_export_filename = NULL;
 140 }
 141
 142 static void
 143 ps_document_dispose (GObject *object)
 144 {
 145         PSDocument *gs = PS_DOCUMENT (object);
 146
 147         g_return_if_fail (gs != NULL);
 148
 149         if (gs->gs_psfile) {
 150                 fclose (gs->gs_psfile);
 151                 gs->gs_psfile = NULL;
 152         }
 153
 154         if (gs->gs_filename) {
 155                 g_free (gs->gs_filename);
 156                 gs->gs_filename = NULL;
 157         }
 158
 159         if (gs->doc) {
 160                 psfree (gs->doc);
 161                 gs->doc = NULL;
 162         }
 163
 164         if (gs->gs_filename_unc) {
 165                 unlink(gs->gs_filename_unc);
 166                 g_free(gs->gs_filename_unc);
 167                 gs->gs_filename_unc = NULL;
 168         }
 169
 170         if (gs->bpixmap) {
 171                 gdk_drawable_unref (gs->bpixmap);
 172         }
 173
 174         if(gs->input_buffer) {
 175                 g_free(gs->input_buffer);
 176                 gs->input_buffer = NULL;
 177         }
 178
 179         if (gs->target_window) {
 180                 gtk_widget_destroy (gs->target_window);
 181                 gs->target_window = NULL;
 182                 gs->pstarget = NULL;
 183         }
 184
 185         stop_interpreter (gs);
 186
 187         G_OBJECT_CLASS (parent_class)->dispose (object);
 188 }
 189
 190 static void
 191 ps_document_class_init(PSDocumentClass *klass)
 192 {
 193         GObjectClass *object_class;
 194
 195         object_class = (GObjectClass *) klass;
 196         parent_class = g_type_class_peek_parent (klass);
 197         gs_class = klass;
 198
 199         object_class->dispose = ps_document_dispose;
 200
 201         klass->gs_atom = gdk_atom_intern ("GHOSTVIEW", FALSE);
 202         klass->next_atom = gdk_atom_intern ("NEXT", FALSE);
 203         klass->page_atom = gdk_atom_intern ("PAGE", FALSE);
 204         klass->string_atom = gdk_atom_intern ("STRING", FALSE);
 205 }
 206
 207 static void
 208 push_pixbuf (PSDocument *gs)
 209 {
 210         GdkColormap *cmap;
 211         GdkPixbuf *pixbuf;
 212         int width, height;
 213
 214         if (gs->pstarget == NULL)
 215                 return;
 216
 217         cmap = gdk_window_get_colormap (gs->pstarget);
 218         gdk_drawable_get_size (gs->bpixmap, &width, &height);
 219         LOG ("Get from drawable\n");
 220         pixbuf =  gdk_pixbuf_get_from_drawable (NULL, gs->bpixmap, cmap,
 221                                                 0, 0, 0, 0,
 222                                                 width, height);
 223         LOG ("Get from drawable done\n");
 224         g_signal_emit_by_name (gs, "render_finished", pixbuf);
 225         g_object_unref (pixbuf);
 226 }
 227
 228 static void
 229 interpreter_failed (PSDocument *gs, char *msg)
 230 {
 231         LOG ("Interpreter failed %s", msg);
 232
 233         push_pixbuf (gs);
 234
 235         stop_interpreter (gs);
 236 }
 237
 238 static gboolean
 239 ps_document_widget_event (GtkWidget *widget, GdkEvent *event, gpointer data)
 240 {
 241         PSDocument *gs = (PSDocument *) data;
 242
 243         if(event->type != GDK_CLIENT_EVENT)
 244                 return FALSE;
 245
 246         gs->message_window = event->client.data.l[0];
 247
 248         if (event->client.message_type == gs_class->page_atom) {
 249                 LOG ("GS rendered the document");
 250                 gs->busy = FALSE;
 251
 252                 push_pixbuf (gs);
 253                 LOG ("Pixbuf pushed");
 254         }
 255
 256         return TRUE;
 257 }
 258
 259 static void
 260 send_ps (PSDocument *gs, long begin, unsigned int len, gboolean close)
 261 {
 262         struct record_list *ps_new;
 263
 264         if (gs->interpreter_input < 0) {
 265                 g_critical("No pipe to gs: error in send_ps().");
 266                 return;
 267         }
 268
 269         ps_new = g_new0 (struct record_list, 1);
 270         ps_new->fp = gs->gs_psfile;
 271         ps_new->begin = begin;
 272         ps_new->len = len;
 273         ps_new->seek_needed = TRUE;
 274         ps_new->close = close;
 275         ps_new->next = NULL;
 276
 277         if (gs->input_buffer == NULL) {
 278                 gs->input_buffer = g_malloc(MAX_BUFSIZE);
 279         }
 280
 281         if (gs->ps_input == NULL) {
 282                 gs->input_buffer_ptr = gs->input_buffer;
 283                 gs->bytes_left = len;
 284                 gs->buffer_bytes_left = 0;
 285                 gs->ps_input = ps_new;
 286                 gs->interpreter_input_id = gdk_input_add
 287                         (gs->interpreter_input, GDK_INPUT_WRITE, input, gs);
 288         } else {
 289                 struct record_list *p = gs->ps_input;
 290                 while (p->next != NULL) {
 291                         p = p->next;
 292                 }
 293                 p->next = ps_new;
 294         }
 295 }
 296
 297 static void
 298 setup_pixmap (PSDocument *gs, int page, double scale, int rotation)
 299 {
 300         GdkGC *fill;
 301         GdkColor white = { 0, 0xFFFF, 0xFFFF, 0xFFFF };   /* pixel, r, g, b */
 302         GdkColormap *colormap;
 303         double width, height;
 304         int pixmap_width, pixmap_height;
 305
 306         if (gs->pstarget == NULL)
 307                 return;
 308
 309         ev_document_get_page_size (EV_DOCUMENT (gs), page, &width, &height);
 310
 311         if (rotation == 90 || rotation == 270) {
 312                 pixmap_height = width * scale + 0.5;
 313                 pixmap_width = height * scale + 0.5;
 314         } else {
 315                 pixmap_width = width * scale + 0.5;
 316                 pixmap_height = height * scale + 0.5;
 317         }
 318
 319         if(gs->bpixmap) {
 320                 int w, h;
 321
 322                 gdk_drawable_get_size (gs->bpixmap, &w, &h);
 323
 324                 if (pixmap_width != w || h != pixmap_height) {
 325                         gdk_drawable_unref (gs->bpixmap);
 326                         gs->bpixmap = NULL;
 327                         stop_interpreter (gs);
 328                 }
 329         }
 330
 331         if (!gs->bpixmap) {
 332                 LOG ("Create pixmap");
 333
 334                 fill = gdk_gc_new (gs->pstarget);
 335                 colormap = gdk_drawable_get_colormap (gs->pstarget);
 336                 gdk_color_alloc (colormap, &white);
 337                 gdk_gc_set_foreground (fill, &white);
 338                 gs->bpixmap = gdk_pixmap_new (gs->pstarget, pixmap_width,
 339                                               pixmap_height, -1);
 340                 gdk_draw_rectangle (gs->bpixmap, fill, TRUE,
 341                                     0, 0, pixmap_width, pixmap_height);
 342         }
 343 }
 344
 345 #define DEFAULT_PAGE_SIZE 1
 346
 347 static void
 348 get_page_box (PSDocument *gs, int page, int *urx, int *ury, int *llx, int *lly)
 349 {
 350         gint new_llx = 0;
 351         gint new_lly = 0;
 352         gint new_urx = 0;
 353         gint new_ury = 0;
 354         GtkGSPaperSize *papersizes = gtk_gs_defaults_get_paper_sizes ();
 355         int new_pagesize = -1;
 356
 357         g_return_if_fail (PS_IS_DOCUMENT (gs));
 358
 359         if (new_pagesize == -1) {
 360                 new_pagesize = DEFAULT_PAGE_SIZE;
 361                 if (gs->doc) {
 362                 /* If we have a document:
 363                  * We use -- the page size (if specified)
 364                  * or the doc. size (if specified)
 365                  * or the page bbox (if specified)
 366                  * or the bounding box
 367                  */
 368                         if ((page >= 0) && (gs->doc->numpages > page) &&
 369                             (gs->doc->pages) && (gs->doc->pages[page].size)) {
 370                                 new_pagesize = gs->doc->pages[page].size - gs->doc->size;
 371                         } else if (gs->doc->default_page_size != NULL) {
 372                                 new_pagesize = gs->doc->default_page_size - gs->doc->size;
 373                         } else if ((page >= 0) &&
 374                                    (gs->doc->numpages > page) &&
 375                                    (gs->doc->pages) &&
 376                                    (gs->doc->pages[page].boundingbox[URX] >
 377                                     gs->doc->pages[page].boundingbox[LLX]) &&
 378                                    (gs->doc->pages[page].boundingbox[URY] >
 379                                     gs->doc->pages[page].boundingbox[LLY])) {
 380                                 new_pagesize = -1;
 381                         } else if ((gs->doc->boundingbox[URX] > gs->doc->boundingbox[LLX]) &&
 382                                    (gs->doc->boundingbox[URY] > gs->doc->boundingbox[LLY])) {
 383                                 new_pagesize = -1;
 384                         }
 385                 }
 386         }
 387
 388         /* Compute bounding box */
 389         if (gs->doc && (gs->doc->epsf || new_pagesize == -1)) {    /* epsf or bbox */
 390                 if ((page >= 0) &&
 391                     (gs->doc->pages) &&
 392                     (gs->doc->pages[page].boundingbox[URX] >
 393                      gs->doc->pages[page].boundingbox[LLX]) &&
 394                     (gs->doc->pages[page].boundingbox[URY] >
 395                      gs->doc->pages[page].boundingbox[LLY])) {
 396                         /* use page bbox */
 397                         new_llx = gs->doc->pages[page].boundingbox[LLX];
 398                         new_lly = gs->doc->pages[page].boundingbox[LLY];
 399                         new_urx = gs->doc->pages[page].boundingbox[URX];
 400                         new_ury = gs->doc->pages[page].boundingbox[URY];
 401                 } else if ((gs->doc->boundingbox[URX] > gs->doc->boundingbox[LLX]) &&
 402                            (gs->doc->boundingbox[URY] > gs->doc->boundingbox[LLY])) {
 403                         /* use doc bbox */
 404                         new_llx = gs->doc->boundingbox[LLX];
 405                         new_lly = gs->doc->boundingbox[LLY];
 406                         new_urx = gs->doc->boundingbox[URX];
 407                         new_ury = gs->doc->boundingbox[URY];
 408                 }
 409         } else {
 410                 if (new_pagesize < 0)
 411                         new_pagesize = DEFAULT_PAGE_SIZE;
 412                 new_llx = new_lly = 0;
 413                 if (gs->doc && gs->doc->size &&
 414                     (new_pagesize < gs->doc->numsizes)) {
 415                         new_urx = gs->doc->size[new_pagesize].width;
 416                         new_ury = gs->doc->size[new_pagesize].height;
 417                 } else {
 418                         new_urx = papersizes[new_pagesize].width;
 419                         new_ury = papersizes[new_pagesize].height;
 420                 }
 421         }
 422
 423         if (new_urx <= new_llx)
 424                 new_urx = papersizes[12].width;
 425         if (new_ury <= new_lly)
 426                 new_ury = papersizes[12].height;
 427
 428         *urx = new_urx;
 429         *ury = new_ury;
 430         *llx = new_llx;
 431         *lly = new_lly;
 432 }
 433
 434 static void
 435 setup_page (PSDocument *gs, int page, double scale, int rotation)
 436 {
 437         gchar *buf;
 438         char scaled_dpi[G_ASCII_DTOSTR_BUF_SIZE];
 439         int urx, ury, llx, lly;
 440
 441         LOG ("Setup the page");
 442
 443         get_page_box (gs, page, &urx, &ury, &llx, &lly);
 444         g_ascii_dtostr (scaled_dpi, G_ASCII_DTOSTR_BUF_SIZE, 72.0 * scale);
 445
 446         buf = g_strdup_printf ("%ld %d %d %d %d %d %s %s %d %d %d %d",
 447                                0L, rotation, llx, lly, urx, ury,
 448                                scaled_dpi, scaled_dpi,
 449                                0, 0, 0, 0);
 450         LOG ("GS property %s", buf);
 451
 452         gdk_property_change (gs->pstarget, gs_class->gs_atom, gs_class->string_atom,
 453                              8, GDK_PROP_MODE_REPLACE, (guchar *)buf, strlen(buf));
 454         g_free (buf);
 455
 456         gdk_flush ();
 457 }
 458
 459 static void
 460 close_pipe (int p[2])
 461 {
 462         if (p[0] != -1) {
 463                 close (p[0]);
 464         }
 465         if (p[1] != -1) {
 466                 close (p[1]);
 467         }
 468 }
 469
 470 static gboolean
 471 is_interpreter_ready (PSDocument *gs)
 472 {
 473         return (gs->interpreter_pid != -1 && !gs->busy && gs->ps_input == NULL);
 474 }
 475
 476 static void
 477 output (gpointer data, gint source, GdkInputCondition condition)
 478 {
 479         char buf[MAX_BUFSIZE + 1];
 480         guint bytes = 0;
 481         PSDocument *gs = PS_DOCUMENT(data);
 482
 483         if (source == gs->interpreter_output) {
 484                 bytes = read(gs->interpreter_output, buf, MAX_BUFSIZE);
 485                 if (bytes == 0) {            /* EOF occurred */
 486                         close (gs->interpreter_output);
 487                         gs->interpreter_output = -1;
 488                         gdk_input_remove (gs->interpreter_output_id);
 489                         return;
 490                 } else if (bytes == -1) {
 491                         /* trouble... */
 492                         interpreter_failed (gs, NULL);
 493                         return;
 494                 }
 495                 if (gs->interpreter_err == -1) {
 496                         interpreter_failed (gs, NULL);
 497                 }
 498         } else if (source == gs->interpreter_err) {
 499                 bytes = read (gs->interpreter_err, buf, MAX_BUFSIZE);
 500                 if (bytes == 0) {            /* EOF occurred */
 501                         close (gs->interpreter_err);
 502                         gs->interpreter_err = -1;
 503                         gdk_input_remove (gs->interpreter_error_id);
 504                         return;
 505                 } else if (bytes == -1) {
 506                         /* trouble... */
 507                         interpreter_failed (gs, NULL);
 508                         return;
 509                 }
 510                 if (gs->interpreter_output == -1) {
 511                         interpreter_failed(gs, NULL);
 512                 }
 513         }
 514
 515         if (bytes > 0) {
 516                 buf[bytes] = '\0';
 517                 printf ("%s", buf);
 518         }
 519 }
 520
 521 static void
 522 catchPipe (int i)
 523 {
 524         broken_pipe = True;
 525 }
 526
 527 static void
 528 input(gpointer data, gint source, GdkInputCondition condition)
 529 {
 530         PSDocument *gs = PS_DOCUMENT(data);
 531         int bytes_written;
 532         void (*oldsig) (int);
 533         oldsig = signal(SIGPIPE, catchPipe);
 534
 535         LOG ("Input");
 536
 537         do {
 538                 if (gs->buffer_bytes_left == 0) {
 539                         /* Get a new section if required */
 540                         if (gs->ps_input && gs->bytes_left == 0) {
 541                                 struct record_list *ps_old = gs->ps_input;
 542                                 gs->ps_input = ps_old->next;
 543                                 if (ps_old->close && NULL != ps_old->fp)
 544                                         fclose (ps_old->fp);
 545                                 g_free (ps_old);
 546                         }
 547
 548                         /* Have to seek at the beginning of each section */
 549                         if (gs->ps_input && gs->ps_input->seek_needed) {
 550                                 fseek (gs->ps_input->fp, gs->ps_input->begin, SEEK_SET);
 551                                 gs->ps_input->seek_needed = FALSE;
 552                                 gs->bytes_left = gs->ps_input->len;
 553                         }
 554
 555                         if (gs->bytes_left > MAX_BUFSIZE) {
 556                                 gs->buffer_bytes_left = fread (gs->input_buffer, sizeof(char),
 557                                                                MAX_BUFSIZE, gs->ps_input->fp);
 558                         } else if (gs->bytes_left > 0) {
 559                                 gs->buffer_bytes_left = fread (gs->input_buffer, sizeof(char),
 560                                                                gs->bytes_left, gs->ps_input->fp);
 561                         } else {
 562                                 gs->buffer_bytes_left = 0;
 563                         }
 564                         if (gs->bytes_left > 0 && gs->buffer_bytes_left == 0) {
 565                                 interpreter_failed (gs, NULL); /* Error occurred */
 566                         }
 567                         gs->input_buffer_ptr = gs->input_buffer;
 568                         gs->bytes_left -= gs->buffer_bytes_left;
 569                 }
 570
 571                 if (gs->buffer_bytes_left > 0) {
 572                         bytes_written = write (gs->interpreter_input,
 573                                                gs->input_buffer_ptr, gs->buffer_bytes_left);
 574
 575                         if (broken_pipe) {
 576                                 interpreter_failed (gs, g_strdup(_("Broken pipe.")));
 577                                 broken_pipe = FALSE;
 578                                 interpreter_failed (gs, NULL);
 579                         } else if (bytes_written == -1) {
 580                                 if ((errno != EWOULDBLOCK) && (errno != EAGAIN)) {
 581                                         interpreter_failed (gs, NULL);   /* Something bad happened */
 582                                 }
 583                                 } else {
 584                                 gs->buffer_bytes_left -= bytes_written;
 585                                 gs->input_buffer_ptr += bytes_written;
 586                         }
 587                 }
 588         } while (gs->ps_input && gs->buffer_bytes_left == 0);
 589
 590         signal (SIGPIPE, oldsig);
 591
 592         if (gs->ps_input == NULL && gs->buffer_bytes_left == 0) {
 593                 if (gs->interpreter_input_id != 0) {
 594                         gdk_input_remove (gs->interpreter_input_id);
 595                         gs->interpreter_input_id = 0;
 596                 }
 597         }
 598 }
 599
 600 static int
 601 start_interpreter (PSDocument *gs)
 602 {
 603         int std_in[2] = { -1, -1 };   /* pipe to interp stdin */
 604         int std_out[2];               /* pipe from interp stdout */
 605         int std_err[2];               /* pipe from interp stderr */
 606
 607 #define NUM_ARGS    100
 608 #define NUM_GS_ARGS (NUM_ARGS - 20)
 609 #define NUM_ALPHA_ARGS 10
 610
 611         char *argv[NUM_ARGS], *dir, *gv_env, *gs_path;
 612         char **gs_args, **alpha_args = NULL;
 613         int argc = 0, i;
 614
 615         LOG ("Start the interpreter");
 616
 617         if(!gs->gs_filename)
 618                 return 0;
 619
 620         stop_interpreter(gs);
 621
 622         /* set up the args... */
 623         gs_path = g_find_program_in_path ("gs");
 624         gs_args = g_strsplit (gs_path, " ", NUM_GS_ARGS);
 625         g_free (gs_path);
 626         for(i = 0; i < NUM_GS_ARGS && gs_args[i]; i++, argc++) {
 627                 argv[argc] = gs_args[i];
 628         }
 629
 630         alpha_args = g_strsplit (ALPHA_PARAMS, " ", NUM_ALPHA_ARGS);
 631         for(i = 0; i < NUM_ALPHA_ARGS && alpha_args[i]; i++, argc++) {
 632                 argv[argc] = alpha_args[i];
 633         }
 634
 635         argv[argc++] = "-dNOPAUSE";
 636         argv[argc++] = "-dQUIET";
 637         argv[argc++] = "-dSAFER";
 638
 639         /* set up the pipes */
 640         if (gs->send_filename_to_gs) {
 641                 argv[argc++] = PS_DOCUMENT_GET_PS_FILE (gs);
 642                 argv[argc++] = "-c";
 643                 argv[argc++] = "quit";
 644         } else {
 645                 argv[argc++] = "-";
 646         }
 647
 648         argv[argc++] = NULL;
 649
 650         if (!gs->reading_from_pipe && !gs->send_filename_to_gs) {
 651                 if (pipe (std_in) == -1) {
 652                         g_critical ("Unable to open pipe to Ghostscript.");
 653                         return -1;
 654                 }
 655         }
 656
 657         if (pipe (std_out) == -1) {
 658                 close_pipe (std_in);
 659                 return -1;
 660         }
 661
 662         if (pipe(std_err) == -1) {
 663                 close_pipe (std_in);
 664                 close_pipe (std_out);
 665                 return -1;
 666         }
 667
 668         gv_env = g_strdup_printf ("GHOSTVIEW=%ld %ld",
 669                                   gdk_x11_drawable_get_xid (gs->pstarget),
 670                                   gdk_x11_drawable_get_xid (gs->bpixmap));
 671         LOG ("Launching ghostview with env %s", gv_env);
 672
 673         gs->interpreter_pid = fork ();
 674         switch (gs->interpreter_pid) {
 675                 case -1:                     /* error */
 676                         close_pipe (std_in);
 677                         close_pipe (std_out);
 678                         close_pipe (std_err);
 679                         return -2;
 680                         break;
 681                 case 0:                      /* child */
 682                         close (std_out[0]);
 683                         dup2 (std_out[1], 1);
 684                         close (std_out[1]);
 685
 686                         close (std_err[0]);
 687                         dup2 (std_err[1], 2);
 688                         close (std_err[1]);
 689
 690                         if (!gs->reading_from_pipe) {
 691                                 if (gs->send_filename_to_gs) {
 692                                         int stdinfd;
 693                                         /* just in case gs tries to read from stdin */
 694                                         stdinfd = open("/dev/null", O_RDONLY);
 695                                         if (stdinfd != 0) {
 696                                                 dup2(stdinfd, 0);
 697                                                 close(stdinfd);
 698                                         }
 699                                 } else {
 700                                         close (std_in[1]);
 701                                         dup2 (std_in[0], 0);
 702                                         close (std_in[0]);
 703                                 }
 704                         }
 705
 706                         putenv(gv_env);
 707
 708                         /* change to directory where the input file is. This helps
 709                          * with postscript-files which include other files using
 710                          * a relative path */
 711                         dir = g_path_get_dirname (gs->gs_filename);
 712                         chdir (dir);
 713                         g_free (dir);
 714
 715                         execvp (argv[0], argv);
 716
 717                         /* Notify error */
 718                         g_critical ("Unable to execute [%s]\n", argv[0]);
 719                         g_strfreev (gs_args);
 720                         g_free (gv_env);
 721                         g_strfreev (alpha_args);
 722                         _exit (1);
 723                         break;
 724                 default:                     /* parent */
 725                         if (!gs->send_filename_to_gs && !gs->reading_from_pipe) {
 726                                 int result;
 727                                 close (std_in[0]);
 728                                 /* use non-blocking IO for pipe to ghostscript */
 729                                 result = fcntl (std_in[1], F_GETFL, 0);
 730                                 fcntl (std_in[1], F_SETFL, result | O_NONBLOCK);
 731                                 gs->interpreter_input = std_in[1];
 732                         } else {
 733                                 gs->interpreter_input = -1;
 734                         }
 735                         close (std_out[1]);
 736
 737                         gs->interpreter_output = std_out[0];
 738                         close (std_err[1]);
 739                         gs->interpreter_err = std_err[0];
 740                         gs->interpreter_output_id =
 741                                 gdk_input_add (std_out[0], GDK_INPUT_READ, output, gs);
 742                         gs->interpreter_error_id =
 743                                 gdk_input_add (std_err[0], GDK_INPUT_READ, output, gs);
 744                         break;
 745         }
 746
 747         return TRUE;
 748 }
 749
 750 static void
 751 stop_interpreter(PSDocument * gs)
 752 {
 753         if (gs->interpreter_pid > 0) {
 754                 int status = 0;
 755                 LOG ("Stop the interpreter");
 756                 kill (gs->interpreter_pid, SIGTERM);
 757                 while ((wait(&status) == -1) && (errno == EINTR));
 758                 gs->interpreter_pid = -1;
 759                 if (status == 1) {
 760                         gs->gs_status = _("Interpreter failed.");
 761                 }
 762         }
 763
 764         if (gs->interpreter_input >= 0) {
 765                 close (gs->interpreter_input);
 766                 gs->interpreter_input = -1;
 767                 if (gs->interpreter_input_id != 0) {
 768                         gdk_input_remove(gs->interpreter_input_id);
 769                         gs->interpreter_input_id = 0;
 770                 }
 771                 while (gs->ps_input) {
 772                         struct record_list *ps_old = gs->ps_input;
 773                         gs->ps_input = gs->ps_input->next;
 774                         if (ps_old->close && NULL != ps_old->fp)
 775                                 fclose (ps_old->fp);
 776                         g_free (ps_old);
 777                 }
 778         }
 779
 780         if (gs->interpreter_output >= 0) {
 781                 close (gs->interpreter_output);
 782                 gs->interpreter_output = -1;
 783                 if (gs->interpreter_output_id) {
 784                         gdk_input_remove (gs->interpreter_output_id);
 785                         gs->interpreter_output_id = 0;
 786                 }
 787         }
 788
 789         if (gs->interpreter_err >= 0) {
 790                 close (gs->interpreter_err);
 791                 gs->interpreter_err = -1;
 792                 if (gs->interpreter_error_id) {
 793                         gdk_input_remove (gs->interpreter_error_id);
 794                         gs->interpreter_error_id = 0;
 795                 }
 796         }
 797
 798         gs->busy = FALSE;
 799 }
 800
 801 /* If file exists and is a regular file then return its length, else -1 */
 802 static gint
 803 file_length (const gchar * filename)
 804 {
 805         struct stat stat_rec;
 806
 807         if (filename && (stat (filename, &stat_rec) == 0) && S_ISREG (stat_rec.st_mode))
 808                 return stat_rec.st_size;
 809         else
 810                 return -1;
 811 }
 812
 813 /* Test if file exists, is a regular file and its length is > 0 */
 814 static gboolean
 815 file_readable(const char *filename)
 816 {
 817         return (file_length (filename) > 0);
 818 }
 819
 820 /*
 821  * Decompress gs->gs_filename if necessary
 822  * Set gs->filename_unc to the name of the uncompressed file or NULL.
 823  * Error reporting via signal 'interpreter_message'
 824  * Return name of input file to use or NULL on error..
 825  */
 826 static gchar *
 827 check_filecompressed (PSDocument * gs)
 828 {
 829         FILE *file;
 830         gchar buf[1024];
 831         gchar *filename, *filename_unc, *filename_err, *cmdline;
 832         const gchar *cmd;
 833         int fd;
 834
 835         cmd = NULL;
 836
 837         if ((file = fopen(gs->gs_filename, "r")) &&
 838             (fread (buf, sizeof(gchar), 3, file) == 3)) {
 839                 if ((buf[0] == '\037') && ((buf[1] == '\235') || (buf[1] == '\213'))) {
 840                         /* file is gzipped or compressed */
 841                         cmd = gtk_gs_defaults_get_ungzip_cmd ();
 842                 } else if (strncmp (buf, "BZh", 3) == 0) {
 843                         /* file is compressed with bzip2 */
 844                         cmd = gtk_gs_defaults_get_unbzip2_cmd ();
 845                 }
 846         }
 847
 848         if (NULL != file)
 849                 fclose(file);
 850
 851         if (!cmd)
 852                 return gs->gs_filename;
 853
 854         /* do the decompression */
 855         filename = g_shell_quote (gs->gs_filename);
 856         filename_unc = g_strconcat (g_get_tmp_dir (), "/evinceXXXXXX", NULL);
 857         if ((fd = mkstemp (filename_unc)) < 0) {
 858                 g_free (filename_unc);
 859                 g_free (filename);
 860                 return NULL;
 861         }
 862         close (fd);
 863
 864         filename_err = g_strconcat (g_get_tmp_dir (), "/evinceXXXXXX", NULL);
 865         if ((fd = mkstemp(filename_err)) < 0) {
 866                 g_free (filename_err);
 867                 g_free (filename_unc);
 868                 g_free (filename);
 869                 return NULL;
 870         }
 871         close (fd);
 872
 873         cmdline = g_strdup_printf ("%s %s >%s 2>%s", cmd,
 874                                    filename, filename_unc, filename_err);
 875         if (system (cmdline) == 0 &&
 876             file_readable (filename_unc) &&
 877             file_length (filename_err) == 0) {
 878                 /* sucessfully uncompressed file */
 879                 gs->gs_filename_unc = filename_unc;
 880         } else {
 881                 gchar *filename_dsp;
 882                 gchar *msg;
 883
 884                 /* report error */
 885                 filename_dsp = g_filename_display_name (gs->gs_filename);
 886                 msg = g_strdup_printf (_("Error while decompressing file “%s”:\n"), filename_dsp);
 887                 g_free (filename_dsp);
 888
 889                 interpreter_failed (gs, msg);
 890                 g_free (msg);
 891                 unlink (filename_unc);
 892                 g_free (filename_unc);
 893                 filename_unc = NULL;
 894         }
 895
 896         unlink (filename_err);
 897         g_free (filename_err);
 898         g_free (cmdline);
 899         g_free (filename);
 900
 901         return filename_unc;
 902 }
 903
 904 static gint
 905 ps_document_enable_interpreter(PSDocument *gs)
 906 {
 907         g_return_val_if_fail (PS_IS_DOCUMENT (gs), FALSE);
 908
 909         if (!gs->gs_filename)
 910                 return 0;
 911
 912         return start_interpreter (gs);
 913 }
 914
 915 static gboolean
 916 document_load (PSDocument *gs, const gchar *fname)
 917 {
 918         g_return_val_if_fail (PS_IS_DOCUMENT(gs), FALSE);
 919
 920         LOG ("Load the document");
 921
 922         if (fname == NULL) {
 923                 gs->gs_status = "";
 924                 return FALSE;
 925         }
 926
 927         /* prepare this document */
 928         gs->structured_doc = FALSE;
 929         gs->send_filename_to_gs = TRUE;
 930         gs->gs_filename = g_strdup (fname);
 931
 932         if ((gs->reading_from_pipe = (strcmp (fname, "-") == 0))) {
 933                 gs->send_filename_to_gs = FALSE;
 934         } else {
 935                 /*
 936                  * We need to make sure that the file is loadable/exists!
 937                  * otherwise we want to exit without loading new stuff...
 938                  */
 939                 gchar *filename = NULL;
 940
 941                 if (!file_readable(fname)) {
 942                         gchar *filename_dsp;
 943                         gchar *msg;
 944
 945                         filename_dsp = g_filename_display_name (fname);
 946                         msg = g_strdup_printf (_("Cannot open file “%s”.\n"), filename_dsp);
 947                         g_free (filename_dsp);
 948
 949                         interpreter_failed (gs, msg);
 950                         g_free (msg);
 951                         gs->gs_status = _("File is not readable.");
 952                 } else {
 953                         filename = check_filecompressed(gs);
 954                 }
 955
 956                 if (!filename || (gs->gs_psfile = fopen(filename, "r")) == NULL) {
 957                         interpreter_failed (gs, NULL);
 958                         return FALSE;
 959                 }
 960
 961                 /* we grab the vital statistics!!! */
 962                 gs->doc = psscan(gs->gs_psfile, TRUE, filename);
 963
 964                 if ((!gs->doc->epsf && gs->doc->numpages > 0) ||
 965                     (gs->doc->epsf && gs->doc->numpages > 1)) {
 966                         gs->structured_doc = TRUE;
 967                         gs->send_filename_to_gs = FALSE;
 968                 }
 969         }
 970
 971         gs->gs_status = _("Document loaded.");
 972
 973         return TRUE;
 974 }
 975
 976 static gboolean
 977 ps_document_next_page (PSDocument *gs)
 978 {
 979         XEvent event;
 980
 981         LOG ("Make ghostscript render next page");
 982
 983         g_return_val_if_fail (PS_IS_DOCUMENT(gs), FALSE);
 984         g_return_val_if_fail (gs->interpreter_pid != 0, FALSE);
 985         g_return_val_if_fail (gs->busy != TRUE, FALSE);
 986
 987         gs->busy = TRUE;
 988
 989         event.xclient.type = ClientMessage;
 990         event.xclient.display = gdk_display;
 991         event.xclient.window = gs->message_window;
 992         event.xclient.message_type = gdk_x11_atom_to_xatom(gs_class->next_atom);
 993         event.xclient.format = 32;
 994
 995         gdk_error_trap_push ();
 996         XSendEvent (gdk_display, gs->message_window, FALSE, 0, &event);
 997         gdk_flush ();
 998         gdk_error_trap_pop ();
 999
1000         return TRUE;
1001 }
1002
1003 static gboolean
1004 render_page (PSDocument *gs, int page)
1005 {
1006         g_return_val_if_fail(gs != NULL, FALSE);
1007         g_return_val_if_fail(PS_IS_DOCUMENT(gs), FALSE);
1008
1009         if(!gs->gs_filename) {
1010                 return FALSE;
1011         }
1012
1013         if (gs->structured_doc && gs->doc) {
1014                 LOG ("It's a structured document, let's send one page to gs");
1015
1016                 if (is_interpreter_ready (gs)) {
1017                         ps_document_next_page (gs);
1018                 } else {
1019                         ps_document_enable_interpreter (gs);
1020                         send_ps (gs, gs->doc->beginprolog, gs->doc->lenprolog, FALSE);
1021                         send_ps (gs, gs->doc->beginsetup, gs->doc->lensetup, FALSE);
1022                 }
1023
1024                 send_ps (gs, gs->doc->pages[page].begin,
1025                          gs->doc->pages[page].len, FALSE);
1026         } else {
1027                 /* Unstructured document
1028                  *
1029                  * In the case of non structured documents,
1030                  * GS read the PS from the  actual file (via command
1031                  * line. Hence, ggv only send a signal next page.
1032                  * If ghostview is not running it is usually because
1033                  * the last page of the file was displayed. In that
1034                  * case, ggv restarts GS again and the first page is displayed.
1035                  */
1036
1037                 LOG ("It's an unstructured document, gs will just read the file");
1038
1039                 if (!is_interpreter_ready (gs)) {
1040                         ps_document_enable_interpreter(gs);
1041                 }
1042                 ps_document_next_page(gs);
1043         }
1044
1045         return TRUE;
1046 }
1047
1048 static gboolean
1049 ps_document_load (EvDocument  *document,
1050                   const char  *uri,
1051                   GError     **error)
1052 {
1053         char *filename;
1054         char *gs_path;
1055         gboolean result;
1056
1057         filename = g_filename_from_uri (uri, NULL, error);
1058         if (!filename)
1059                 return FALSE;
1060
1061         gs_path = g_find_program_in_path ("gs");
1062         if (!gs_path) {
1063                     gchar *filename_dsp;
1064                     filename_dsp = g_filename_display_name (filename);
1065                     g_set_error(error,
1066                                 G_FILE_ERROR,
1067                                 G_FILE_ERROR_NOENT,
1068                                 _("Failed to load document “%s”. Ghostscript interpreter was not found in path"),
1069                                 filename);
1070                     g_free (filename_dsp);
1071                     result = FALSE;
1072         } else {
1073                 result = document_load (PS_DOCUMENT (document), filename);
1074                 if (!result) {
1075                         gchar *filename_dsp;
1076                         filename_dsp = g_filename_display_name (filename);
1077
1078                         g_set_error (error, G_FILE_ERROR,
1079                                      G_FILE_ERROR_FAILED,
1080                                      _("Failed to load document “%s”"),
1081                                      filename_dsp);
1082                         g_free (filename_dsp);
1083                 }
1084                 g_free (gs_path);
1085         }
1086         g_free (filename);
1087
1088         return result;
1089 }
1090
1091 static gboolean
1092 save_document (PSDocument *document, const char *filename)
1093 {
1094         gboolean result = TRUE;
1095         GtkGSDocSink *sink = gtk_gs_doc_sink_new ();
1096         FILE *f, *src_file;
1097         gchar *buf;
1098
1099         src_file = fopen (PS_DOCUMENT_GET_PS_FILE(document), "r");
1100         if (src_file) {
1101                 struct stat stat_rec;
1102
1103                 if (stat (PS_DOCUMENT_GET_PS_FILE(document), &stat_rec) == 0) {
1104                         pscopy (src_file, sink, 0, stat_rec.st_size - 1);
1105                 }
1106
1107                 fclose (src_file);
1108         }
1109
1110         buf = gtk_gs_doc_sink_get_buffer (sink);
1111         if (buf == NULL) {
1112                 return FALSE;
1113         }
1114
1115         f = fopen (filename, "w");
1116         if (f) {
1117                 fputs (buf, f);
1118                 fclose (f);
1119         } else {
1120                 result = FALSE;
1121         }
1122
1123         g_free (buf);
1124         gtk_gs_doc_sink_free (sink);
1125         g_free (sink);
1126
1127         return result;
1128 }
1129
1130 static gboolean
1131 save_page_list (PSDocument *document, int *page_list, const char *filename)
1132 {
1133         gboolean result = TRUE;
1134         GtkGSDocSink *sink = gtk_gs_doc_sink_new ();
1135         FILE *f;
1136         gchar *buf;
1137
1138         pscopydoc (sink, PS_DOCUMENT_GET_PS_FILE(document),
1139                    document->doc, page_list);
1140
1141         buf = gtk_gs_doc_sink_get_buffer (sink);
1142
1143         f = fopen (filename, "w");
1144         if (f) {
1145                 fputs (buf, f);
1146                 fclose (f);
1147         } else {
1148                 result = FALSE;
1149         }
1150
1151         g_free (buf);
1152         gtk_gs_doc_sink_free (sink);
1153         g_free (sink);
1154
1155         return result;
1156 }
1157
1158 static gboolean
1159 ps_document_save (EvDocument  *document,
1160                   const char  *uri,
1161                   GError     **error)
1162 {
1163         PSDocument *ps = PS_DOCUMENT (document);
1164         gboolean result;
1165         char *filename;
1166
1167         filename = g_filename_from_uri (uri, NULL, error);
1168         if (!filename)
1169                 return FALSE;
1170
1171         result = save_document (ps, filename);
1172
1173         g_free (filename);
1174
1175         return result;
1176 }
1177
1178 static int
1179 ps_document_get_n_pages (EvDocument  *document)
1180 {
1181         PSDocument *ps = PS_DOCUMENT (document);
1182
1183         g_return_val_if_fail (ps != NULL, -1);
1184
1185         if (!ps->gs_filename || !ps->doc) {
1186                 return -1;
1187         }
1188
1189         return ps->structured_doc ? ps->doc->numpages : 1;
1190 }
1191
1192 static void
1193 ps_document_get_page_size (EvDocument   *document,
1194                            int           page,
1195                            double       *width,
1196                            double       *height)
1197 {
1198         PSDocument *gs = PS_DOCUMENT (document);
1199         int urx, ury, llx, lly;
1200
1201         get_page_box (gs, page, &urx, &ury, &llx, &lly);
1202
1203         if (width) {
1204                 *width = (urx - llx) + 0.5;
1205         }
1206
1207         if (height) {
1208                 *height = (ury - lly) + 0.5;
1209         }
1210 }
1211
1212 static gboolean
1213 ps_document_can_get_text (EvDocument *document)
1214 {
1215         return FALSE;
1216 }
1217
1218 static void
1219 ps_async_renderer_render_pixbuf (EvAsyncRenderer *renderer, int page, double scale, int rotation)
1220 {
1221         PSDocument *gs = PS_DOCUMENT (renderer);
1222
1223         if (gs->pstarget == NULL) {
1224                 gs->target_window = gtk_window_new (GTK_WINDOW_POPUP);
1225                 gtk_widget_realize (gs->target_window);
1226                 gs->pstarget = gs->target_window->window;
1227
1228                 g_assert (gs->pstarget != NULL);
1229
1230                 g_signal_connect (gs->target_window, "event",
1231                                   G_CALLBACK (ps_document_widget_event),
1232                                   gs);
1233         }
1234
1235         setup_pixmap (gs, page, scale, rotation);
1236         setup_page (gs, page, scale, rotation);
1237
1238         render_page (gs, page);
1239 }
1240
1241 static EvDocumentInfo *
1242 ps_document_get_info (EvDocument *document)
1243 {
1244         EvDocumentInfo *info;
1245         PSDocument *ps = PS_DOCUMENT (document);
1246         int urx, ury, llx, lly;
1247
1248         info = g_new0 (EvDocumentInfo, 1);
1249         info->fields_mask = EV_DOCUMENT_INFO_TITLE |
1250                             EV_DOCUMENT_INFO_FORMAT |
1251                             EV_DOCUMENT_INFO_CREATOR |
1252                             EV_DOCUMENT_INFO_N_PAGES |
1253                             EV_DOCUMENT_INFO_PAPER_SIZE;
1254
1255         info->title = g_strdup (ps->doc->title);
1256         info->format = ps->doc->epsf ? g_strdup (_("Encapsulated PostScript"))
1257                                      : g_strdup (_("PostScript"));
1258         info->creator = g_strdup (ps->doc->creator);
1259         info->n_pages = ev_document_get_n_pages (document);
1260
1261         get_page_box (PS_DOCUMENT (document), 0, &urx, &ury, &llx, &lly);
1262
1263         info->paper_width  = (urx - llx) / 72.0f * 25.4f;
1264         info->paper_height = (ury - lly) / 72.0f * 25.4f;
1265
1266         return info;
1267 }
1268
1269 static void
1270 ps_document_document_iface_init (EvDocumentIface *iface)
1271 {
1272         iface->load = ps_document_load;
1273         iface->save = ps_document_save;
1274         iface->can_get_text = ps_document_can_get_text;
1275         iface->get_n_pages = ps_document_get_n_pages;
1276         iface->get_page_size = ps_document_get_page_size;
1277         iface->get_info = ps_document_get_info;
1278 }
1279
1280 static void
1281 ps_async_renderer_iface_init (EvAsyncRendererIface *iface)
1282 {
1283         iface->render_pixbuf = ps_async_renderer_render_pixbuf;
1284 }
1285
1286 static gboolean
1287 ps_document_file_exporter_format_supported (EvFileExporter      *exporter,
1288                                             EvFileExporterFormat format)
1289 {
1290         return (format == EV_FILE_FORMAT_PS);
1291 }
1292
1293 static void
1294 ps_document_file_exporter_begin (EvFileExporter      *exporter,
1295                                  EvFileExporterFormat format,
1296                                  const char          *filename,
1297                                  int                  first_page,
1298                                  int                  last_page,
1299                                  double               width,
1300                                  double               height,
1301                                  gboolean             duplex)
1302 {
1303         PSDocument *document = PS_DOCUMENT (exporter);
1304
1305         if (document->structured_doc) {
1306                 g_free (document->ps_export_pagelist);
1307
1308                 document->ps_export_pagelist = g_new0 (int, document->doc->numpages);
1309         }
1310
1311         document->ps_export_filename = g_strdup (filename);
1312 }
1313
1314 static void
1315 ps_document_file_exporter_do_page (EvFileExporter *exporter, EvRenderContext *rc)
1316 {
1317         PSDocument *document = PS_DOCUMENT (exporter);
1318
1319         if (document->structured_doc) {
1320                 document->ps_export_pagelist[rc->page] = 1;
1321         }
1322 }
1323
1324 static void
1325 ps_document_file_exporter_end (EvFileExporter *exporter)
1326 {
1327         PSDocument *document = PS_DOCUMENT (exporter);
1328
1329         if (!document->structured_doc) {
1330                 save_document (document, document->ps_export_filename);
1331         } else {
1332                 save_page_list (document, document->ps_export_pagelist,
1333                                 document->ps_export_filename);
1334                 g_free (document->ps_export_pagelist);
1335                 g_free (document->ps_export_filename);
1336                 document->ps_export_pagelist = NULL;
1337                 document->ps_export_filename = NULL;
1338         }
1339 }
1340
1341 static void
1342 ps_document_file_exporter_iface_init (EvFileExporterIface *iface)
1343 {
1344         iface->format_supported = ps_document_file_exporter_format_supported;
1345         iface->begin = ps_document_file_exporter_begin;
1346         iface->do_page = ps_document_file_exporter_do_page;
1347         iface->end = ps_document_file_exporter_end;
1348 }