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