backend/dvi/dvi-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Nickolay V. Shmyrev <nshmyrev@yandex.ru>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "dvi-document.h"
  23 #include "texmfcnf.h"
  24 #include "ev-document-thumbnails.h"
  25 #include "ev-document-misc.h"
  26 #include "ev-file-exporter.h"
  27 #include "ev-file-helpers.h"
  28
  29 #include "mdvi.h"
  30 #include "fonts.h"
  31 #include "color.h"
  32 #include "cairo-device.h"
  33
  34 #include <glib/gi18n-lib.h>
  35 #include <ctype.h>
  36 #ifdef G_OS_WIN32
  37 # define WIFEXITED(x) ((x) != 3)
  38 # define WEXITSTATUS(x) (x)
  39 #else
  40 # include <sys/wait.h>
  41 #endif
  42 #include <stdlib.h>
  43
  44 GMutex *dvi_context_mutex = NULL;
  45
  46 enum {
  47         PROP_0,
  48         PROP_TITLE
  49 };
  50
  51 struct _DviDocumentClass
  52 {
  53         EvDocumentClass parent_class;
  54 };
  55
  56 struct _DviDocument
  57 {
  58         EvDocument parent_instance;
  59
  60         DviContext *context;
  61         DviPageSpec *spec;
  62         DviParams *params;
  63
  64         /* To let document scale we should remember width and height */
  65         double base_width;
  66         double base_height;
  67
  68         gchar *uri;
  69
  70         /* PDF exporter */
  71         gchar            *exporter_filename;
  72         GString          *exporter_opts;
  73 };
  74
  75 typedef struct _DviDocumentClass DviDocumentClass;
  76
  77 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface);
  78 static void dvi_document_file_exporter_iface_init       (EvFileExporterInterface       *iface);
  79 static void dvi_document_do_color_special               (DviContext                    *dvi,
  80                                                          const char                    *prefix,
  81                                                          const char                    *arg);
  82
  83 EV_BACKEND_REGISTER_WITH_CODE (DviDocument, dvi_document,
  84      {
  85       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init);
  86       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER, dvi_document_file_exporter_iface_init);
  87      });
  88
  89 static gboolean
  90 dvi_document_load (EvDocument  *document,
  91                    const char  *uri,
  92                    GError     **error)
  93 {
  94         gchar *filename;
  95         DviDocument *dvi_document = DVI_DOCUMENT(document);
  96
  97         filename = g_filename_from_uri (uri, NULL, error);
  98         if (!filename)
  99                 return FALSE;
 100
 101         g_mutex_lock (dvi_context_mutex);
 102         if (dvi_document->context)
 103                 mdvi_destroy_context (dvi_document->context);
 104
 105         dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
 106         g_mutex_unlock (dvi_context_mutex);
 107         g_free (filename);
 108
 109         if (!dvi_document->context) {
 110                 g_set_error_literal (error,
 111                                      EV_DOCUMENT_ERROR,
 112                                      EV_DOCUMENT_ERROR_INVALID,
 113                                      _("DVI document has incorrect format"));
 114                 return FALSE;
 115         }
 116
 117         mdvi_cairo_device_init (&dvi_document->context->device);
 118
 119
 120         dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 121                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 122
 123         dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 124                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 125
 126         g_free (dvi_document->uri);
 127         dvi_document->uri = g_strdup (uri);
 128
 129         return TRUE;
 130 }
 131
 132
 133 static gboolean
 134 dvi_document_save (EvDocument  *document,
 135                       const char  *uri,
 136                       GError     **error)
 137 {
 138         DviDocument *dvi_document = DVI_DOCUMENT (document);
 139
 140         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 141 }
 142
 143 static int
 144 dvi_document_get_n_pages (EvDocument *document)
 145 {
 146         DviDocument *dvi_document = DVI_DOCUMENT (document);
 147
 148         return dvi_document->context->npages;
 149 }
 150
 151 static void
 152 dvi_document_get_page_size (EvDocument *document,
 153                             EvPage     *page,
 154                             double     *width,
 155                             double     *height)
 156 {
 157         DviDocument *dvi_document = DVI_DOCUMENT (document);
 158
 159         *width = dvi_document->base_width;
 160         *height = dvi_document->base_height;;
 161 }
 162
 163 static cairo_surface_t *
 164 dvi_document_render (EvDocument      *document,
 165                      EvRenderContext *rc)
 166 {
 167         cairo_surface_t *surface;
 168         cairo_surface_t *rotated_surface;
 169         DviDocument *dvi_document = DVI_DOCUMENT(document);
 170         gint required_width, required_height;
 171         gint proposed_width, proposed_height;
 172         gint xmargin = 0, ymargin = 0;
 173
 174         /* We should protect our context since it's not
 175          * thread safe. The work to the future -
 176          * let context render page independently
 177          */
 178         g_mutex_lock (dvi_context_mutex);
 179
 180         mdvi_setpage (dvi_document->context, rc->page->index);
 181
 182         mdvi_set_shrink (dvi_document->context,
 183                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 184                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 185
 186         required_width = dvi_document->base_width * rc->scale + 0.5;
 187         required_height = dvi_document->base_height * rc->scale + 0.5;
 188         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 189         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 190
 191         if (required_width >= proposed_width)
 192             xmargin = (required_width - proposed_width) / 2;
 193         if (required_height >= proposed_height)
 194             ymargin = (required_height - proposed_height) / 2;
 195
 196         mdvi_cairo_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 197         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 198         mdvi_cairo_device_render (dvi_document->context);
 199         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 200
 201         g_mutex_unlock (dvi_context_mutex);
 202
 203         rotated_surface = ev_document_misc_surface_rotate_and_scale (surface,
 204                                                                      required_width,
 205                                                                      required_height,
 206                                                                      rc->rotation);
 207         cairo_surface_destroy (surface);
 208
 209         return rotated_surface;
 210 }
 211
 212 static void
 213 dvi_document_finalize (GObject *object)
 214 {
 215         DviDocument *dvi_document = DVI_DOCUMENT(object);
 216
 217         g_mutex_lock (dvi_context_mutex);
 218         if (dvi_document->context) {
 219                 mdvi_cairo_device_free (&dvi_document->context->device);
 220                 mdvi_destroy_context (dvi_document->context);
 221         }
 222         g_mutex_unlock (dvi_context_mutex);
 223
 224         if (dvi_document->params)
 225                 g_free (dvi_document->params);
 226
 227         if (dvi_document->exporter_filename)
 228                 g_free (dvi_document->exporter_filename);
 229
 230         if (dvi_document->exporter_opts)
 231                 g_string_free (dvi_document->exporter_opts, TRUE);
 232
 233         g_free (dvi_document->uri);
 234
 235         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 236 }
 237
 238 static void
 239 dvi_document_class_init (DviDocumentClass *klass)
 240 {
 241         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 242         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 243         gchar *texmfcnf;
 244
 245         gobject_class->finalize = dvi_document_finalize;
 246
 247         texmfcnf = get_texmfcnf();
 248         mdvi_init_kpathsea ("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI, texmfcnf);
 249         g_free(texmfcnf);
 250
 251         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 252         mdvi_register_fonts ();
 253
 254         dvi_context_mutex = g_mutex_new ();
 255
 256         ev_document_class->load = dvi_document_load;
 257         ev_document_class->save = dvi_document_save;
 258         ev_document_class->get_n_pages = dvi_document_get_n_pages;
 259         ev_document_class->get_page_size = dvi_document_get_page_size;
 260         ev_document_class->render = dvi_document_render;
 261 }
 262
 263 static void
 264 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 265                                         EvRenderContext      *rc,
 266                                         gint                 *width,
 267                                         gint                 *height)
 268 {
 269         DviDocument *dvi_document = DVI_DOCUMENT (document);
 270         gdouble page_width = dvi_document->base_width;
 271         gdouble page_height = dvi_document->base_height;
 272
 273         if (rc->rotation == 90 || rc->rotation == 270) {
 274                 *width = (gint) (page_height * rc->scale);
 275                 *height = (gint) (page_width * rc->scale);
 276         } else {
 277                 *width = (gint) (page_width * rc->scale);
 278                 *height = (gint) (page_height * rc->scale);
 279         }
 280 }
 281
 282 static GdkPixbuf *
 283 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 284                                        EvRenderContext      *rc,
 285                                        gboolean              border)
 286 {
 287         DviDocument *dvi_document = DVI_DOCUMENT (document);
 288         GdkPixbuf *pixbuf;
 289         GdkPixbuf *rotated_pixbuf;
 290         cairo_surface_t *surface;
 291         gint thumb_width, thumb_height;
 292         gint proposed_width, proposed_height;
 293
 294         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 295         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 296
 297         g_mutex_lock (dvi_context_mutex);
 298
 299         mdvi_setpage (dvi_document->context, rc->page->index);
 300
 301         mdvi_set_shrink (dvi_document->context,
 302                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 303                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 304
 305         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 306         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 307
 308         if (border) {
 309                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 310                                                MAX (thumb_width - proposed_width, 0) / 2,
 311                                                MAX (thumb_height - proposed_height, 0) / 2);
 312         } else {
 313                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 314                                                MAX (thumb_width - proposed_width - 2, 0) / 2,
 315                                                MAX (thumb_height - proposed_height - 2, 0) / 2);
 316         }
 317
 318         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 319         mdvi_cairo_device_render (dvi_document->context);
 320         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 321         g_mutex_unlock (dvi_context_mutex);
 322
 323         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 324         cairo_surface_destroy (surface);
 325
 326         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 327         g_object_unref (pixbuf);
 328
 329         if (border) {
 330                 GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 331
 332                 rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 333                 g_object_unref (tmp_pixbuf);
 334         }
 335
 336         return rotated_pixbuf;
 337 }
 338
 339 static void
 340 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
 341 {
 342         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 343         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 344 }
 345
 346 /* EvFileExporterIface */
 347 static void
 348 dvi_document_file_exporter_begin (EvFileExporter        *exporter,
 349                                   EvFileExporterContext *fc)
 350 {
 351         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 352
 353         if (dvi_document->exporter_filename)
 354                 g_free (dvi_document->exporter_filename);
 355         dvi_document->exporter_filename = g_strdup (fc->filename);
 356
 357         if (dvi_document->exporter_opts) {
 358                 g_string_free (dvi_document->exporter_opts, TRUE);
 359         }
 360         dvi_document->exporter_opts = g_string_new ("-s ");
 361 }
 362
 363 static void
 364 dvi_document_file_exporter_do_page (EvFileExporter  *exporter,
 365                                     EvRenderContext *rc)
 366 {
 367        DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 368
 369        g_string_append_printf (dvi_document->exporter_opts, "%d,", (rc->page->index) + 1);
 370 }
 371
 372 static void
 373 dvi_document_file_exporter_end (EvFileExporter *exporter)
 374 {
 375         gchar *command_line;
 376         gint exit_stat;
 377         GError *err = NULL;
 378         gboolean success;
 379
 380         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 381
 382         command_line = g_strdup_printf ("dvipdfm %s -o %s \"%s\"", /* dvipdfm -s 1,2,.., -o exporter_filename dvi_filename */
 383                                         dvi_document->exporter_opts->str,
 384                                         dvi_document->exporter_filename,
 385                                         dvi_document->context->filename);
 386
 387         success = g_spawn_command_line_sync (command_line,
 388                                              NULL,
 389                                              NULL,
 390                                              &exit_stat,
 391                                              &err);
 392
 393         g_free (command_line);
 394
 395         if (success == FALSE) {
 396                 g_warning ("Error: %s", err->message);
 397         } else if (!WIFEXITED(exit_stat) || WEXITSTATUS(exit_stat) != EXIT_SUCCESS){
 398                 g_warning ("Error: dvipdfm does not end normally or exit with a failure status.");
 399         }
 400
 401         if (err)
 402                 g_error_free (err);
 403 }
 404
 405 static EvFileExporterCapabilities
 406 dvi_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 407 {
 408         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 409                 EV_FILE_EXPORTER_CAN_COPIES |
 410                 EV_FILE_EXPORTER_CAN_COLLATE |
 411                 EV_FILE_EXPORTER_CAN_REVERSE |
 412                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 413 }
 414
 415 static void
 416 dvi_document_file_exporter_iface_init (EvFileExporterInterface *iface)
 417 {
 418         iface->begin = dvi_document_file_exporter_begin;
 419         iface->do_page = dvi_document_file_exporter_do_page;
 420         iface->end = dvi_document_file_exporter_end;
 421         iface->get_capabilities = dvi_document_file_exporter_get_capabilities;
 422 }
 423
 424 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 425
 426 static gboolean
 427 hsb2rgb (float h, float s, float v, guchar *red, guchar *green, guchar *blue)
 428 {
 429         float i, f, p, q, t, r, g, b;
 430
 431         if (h == 360)
 432                 h = 0;
 433         else if ((h > 360) || (h < 0))
 434                 return FALSE;
 435
 436         s /= 100;
 437         v /= 100;
 438         h /= 60;
 439         i = floor (h);
 440         f = h - i;
 441         p = v * (1 - s);
 442         q = v * (1 - (s * f));
 443         t = v * (1 - (s * (1 - f)));
 444
 445         if (i == 0) {
 446                 r = v;
 447                 g = t;
 448                 b = p;
 449         } else if (i == 1) {
 450                 r = q;
 451                 g = v;
 452                 b = p;
 453         } else if (i == 2) {
 454                 r = p;
 455                 g = v;
 456                 b = t;
 457         } else if (i == 3) {
 458                 r = p;
 459                 g = q;
 460                 b = v;
 461         } else if (i == 4) {
 462                 r = t;
 463                 g = p;
 464                 b = v;
 465         } else if (i == 5) {
 466                 r = v;
 467                 g = p;
 468                 b = q;
 469         }
 470
 471         *red   = (guchar)floor(r * 255.0);
 472         *green = (guchar)floor(g * 255.0);
 473         *blue  = (guchar)floor(b * 255.0);
 474
 475         return TRUE;
 476 }
 477
 478 static void
 479 parse_color (const gchar *ptr,
 480              gdouble     *color,
 481              gint         n_color)
 482 {
 483         gchar *p = (gchar *)ptr;
 484         gint   i;
 485
 486         for (i = 0; i < n_color; i++) {
 487                 while (isspace (*p)) p++;
 488                 color[i] = g_ascii_strtod (p, NULL);
 489                 while (!isspace (*p) && *p != '\0') p++;
 490                 if (*p == '\0')
 491                         break;
 492         }
 493 }
 494
 495 static void
 496 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 497 {
 498         if (strncmp (arg, "pop", 3) == 0) {
 499                 mdvi_pop_color (dvi);
 500         } else if (strncmp (arg, "push", 4) == 0) {
 501                 /* Find color source: Named, CMYK or RGB */
 502                 const char *tmp = arg + 4;
 503
 504                 while (isspace (*tmp)) tmp++;
 505
 506                 if (!strncmp ("rgb", tmp, 3)) {
 507                         gdouble rgb[3];
 508                         guchar red, green, blue;
 509
 510                         parse_color (tmp + 4, rgb, 3);
 511
 512                         red = 255 * rgb[0];
 513                         green = 255 * rgb[1];
 514                         blue = 255 * rgb[2];
 515
 516                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 517                 } else if (!strncmp ("hsb", tmp, 4)) {
 518                         gdouble hsb[3];
 519                         guchar red, green, blue;
 520
 521                         parse_color (tmp + 4, hsb, 3);
 522
 523                         if (hsb2rgb (hsb[0], hsb[1], hsb[2], &red, &green, &blue))
 524                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 525                 } else if (!strncmp ("cmyk", tmp, 4)) {
 526                         gdouble cmyk[4];
 527                         double r, g, b;
 528                         guchar red, green, blue;
 529
 530                         parse_color (tmp + 5, cmyk, 4);
 531
 532                         r = 1.0 - cmyk[0] - cmyk[3];
 533                         if (r < 0.0)
 534                                 r = 0.0;
 535                         g = 1.0 - cmyk[1] - cmyk[3];
 536                         if (g < 0.0)
 537                                 g = 0.0;
 538                         b = 1.0 - cmyk[2] - cmyk[3];
 539                         if (b < 0.0)
 540                                 b = 0.0;
 541
 542                         red = r * 255 + 0.5;
 543                         green = g * 255 + 0.5;
 544                         blue = b * 255 + 0.5;
 545
 546                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 547                 } else if (!strncmp ("gray ", tmp, 5)) {
 548                         gdouble gray;
 549                         guchar rgb;
 550
 551                         parse_color (tmp + 5, &gray, 1);
 552
 553                         rgb = gray * 255 + 0.5;
 554
 555                         mdvi_push_color (dvi, RGB2ULONG (rgb, rgb, rgb), 0xFFFFFFFF);
 556                 } else {
 557                         GdkColor color;
 558
 559                         if (gdk_color_parse (tmp, &color)) {
 560                                 guchar red, green, blue;
 561
 562                                 red = color.red * 255 / 65535.;
 563                                 green = color.green * 255 / 65535.;
 564                                 blue = color.blue * 255 / 65535.;
 565
 566                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 567                         }
 568                 }
 569         }
 570 }
 571
 572 static void
 573 dvi_document_init_params (DviDocument *dvi_document)
 574 {
 575         dvi_document->params = g_new0 (DviParams, 1);
 576
 577         dvi_document->params->dpi      = MDVI_DPI;
 578         dvi_document->params->vdpi     = MDVI_VDPI;
 579         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 580         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 581         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 582         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 583         dvi_document->params->hdrift   = 0;
 584         dvi_document->params->vdrift   = 0;
 585         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 586         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 587         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 588
 589         dvi_document->spec = NULL;
 590
 591         dvi_document->params->bg = 0xffffffff;
 592         dvi_document->params->fg = 0xff000000;
 593 }
 594
 595 static void
 596 dvi_document_init (DviDocument *dvi_document)
 597 {
 598         dvi_document->context = NULL;
 599         dvi_document_init_params (dvi_document);
 600
 601         dvi_document->exporter_filename = NULL;
 602         dvi_document->exporter_opts = NULL;
 603 }