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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <config.h>
  23 #include "dvi-document.h"
  24 #include "ev-document-thumbnails.h"
  25 #include "ev-document-misc.h"
  26 #include "ev-file-exporter.h"
  27
  28 #include "mdvi.h"
  29 #include "fonts.h"
  30 #include "cairo-device.h"
  31
  32 #include <glib/gi18n.h>
  33
  34 GMutex *dvi_context_mutex = NULL;
  35
  36 enum {
  37         PROP_0,
  38         PROP_TITLE
  39 };
  40
  41 struct _DviDocumentClass
  42 {
  43         GObjectClass parent_class;
  44 };
  45
  46 struct _DviDocument
  47 {
  48         GObject parent_instance;
  49
  50         DviContext *context;
  51         DviPageSpec *spec;
  52         DviParams *params;
  53
  54         /* To let document scale we should remember width and height */
  55         double base_width;
  56         double base_height;
  57
  58         gchar *uri;
  59
  60         /* PDF exporter */
  61         gchar            *exporter_filename;
  62         GString          *exporter_opts;
  63 };
  64
  65 typedef struct _DviDocumentClass DviDocumentClass;
  66
  67 static void dvi_document_document_iface_init            (EvDocumentIface           *iface);
  68 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  69 static void dvi_document_file_exporter_iface_init       (EvFileExporterIface       *iface);
  70 static void dvi_document_do_color_special               (DviContext                *dvi,
  71                                                          const char                *prefix,
  72                                                          const char                *arg);
  73
  74 EV_BACKEND_REGISTER_WITH_CODE (DviDocument, dvi_document,
  75      {
  76       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init);
  77       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER, dvi_document_file_exporter_iface_init);
  78      });
  79
  80 static gboolean
  81 dvi_document_load (EvDocument  *document,
  82                    const char  *uri,
  83                    GError     **error)
  84 {
  85         gchar *filename;
  86         DviDocument *dvi_document = DVI_DOCUMENT(document);
  87
  88         filename = g_filename_from_uri (uri, NULL, error);
  89
  90         if (!filename) {
  91                 g_set_error (error,
  92                              EV_DOCUMENT_ERROR,
  93                              EV_DOCUMENT_ERROR_INVALID,
  94                              _("File not available"));
  95                 return FALSE;
  96         }
  97
  98         g_mutex_lock (dvi_context_mutex);
  99         if (dvi_document->context)
 100                 mdvi_destroy_context (dvi_document->context);
 101
 102         dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
 103         g_mutex_unlock (dvi_context_mutex);
 104         g_free (filename);
 105
 106         if (!dvi_document->context) {
 107                 g_set_error (error,
 108                              EV_DOCUMENT_ERROR,
 109                              EV_DOCUMENT_ERROR_INVALID,
 110                              _("DVI document has incorrect format"));
 111                 return FALSE;
 112         }
 113
 114         mdvi_cairo_device_init (&dvi_document->context->device);
 115
 116
 117         dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 118                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 119
 120         dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 121                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 122
 123         g_free (dvi_document->uri);
 124         dvi_document->uri = g_strdup (uri);
 125
 126         return TRUE;
 127 }
 128
 129
 130 static gboolean
 131 dvi_document_save (EvDocument  *document,
 132                       const char  *uri,
 133                       GError     **error)
 134 {
 135         DviDocument *dvi_document = DVI_DOCUMENT (document);
 136
 137         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 138 }
 139
 140 static int
 141 dvi_document_get_n_pages (EvDocument *document)
 142 {
 143         DviDocument *dvi_document = DVI_DOCUMENT (document);
 144
 145         return dvi_document->context->npages;
 146 }
 147
 148 static void
 149 dvi_document_get_page_size (EvDocument *document,
 150                             EvPage     *page,
 151                             double     *width,
 152                             double     *height)
 153 {
 154         DviDocument *dvi_document = DVI_DOCUMENT (document);
 155
 156         *width = dvi_document->base_width;
 157         *height = dvi_document->base_height;;
 158 }
 159
 160 static cairo_surface_t *
 161 dvi_document_render (EvDocument      *document,
 162                      EvRenderContext *rc)
 163 {
 164         cairo_surface_t *surface;
 165         cairo_surface_t *rotated_surface;
 166         DviDocument *dvi_document = DVI_DOCUMENT(document);
 167         gint required_width, required_height;
 168         gint proposed_width, proposed_height;
 169         gint xmargin = 0, ymargin = 0;
 170
 171         /* We should protect our context since it's not
 172          * thread safe. The work to the future -
 173          * let context render page independently
 174          */
 175         g_mutex_lock (dvi_context_mutex);
 176
 177         mdvi_setpage (dvi_document->context, rc->page->index);
 178
 179         mdvi_set_shrink (dvi_document->context,
 180                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 181                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 182
 183         required_width = dvi_document->base_width * rc->scale + 0.5;
 184         required_height = dvi_document->base_height * rc->scale + 0.5;
 185         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 186         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 187
 188         if (required_width >= proposed_width)
 189             xmargin = (required_width - proposed_width) / 2;
 190         if (required_height >= proposed_height)
 191             ymargin = (required_height - proposed_height) / 2;
 192
 193         mdvi_cairo_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 194         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 195         mdvi_cairo_device_render (dvi_document->context);
 196         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 197
 198         g_mutex_unlock (dvi_context_mutex);
 199
 200         rotated_surface = ev_document_misc_surface_rotate_and_scale (surface,
 201                                                                      required_width,
 202                                                                      required_height,
 203                                                                      rc->rotation);
 204         cairo_surface_destroy (surface);
 205
 206         return rotated_surface;
 207 }
 208
 209 static void
 210 dvi_document_finalize (GObject *object)
 211 {
 212         DviDocument *dvi_document = DVI_DOCUMENT(object);
 213
 214         g_mutex_lock (dvi_context_mutex);
 215         if (dvi_document->context) {
 216                 mdvi_cairo_device_free (&dvi_document->context->device);
 217                 mdvi_destroy_context (dvi_document->context);
 218         }
 219         g_mutex_unlock (dvi_context_mutex);
 220
 221         if (dvi_document->params)
 222                 g_free (dvi_document->params);
 223
 224         if (dvi_document->exporter_filename)
 225                 g_free (dvi_document->exporter_filename);
 226
 227         if (dvi_document->exporter_opts)
 228                 g_string_free (dvi_document->exporter_opts, TRUE);
 229
 230         g_free (dvi_document->uri);
 231
 232         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 233 }
 234
 235
 236 static void
 237 dvi_document_class_init (DviDocumentClass *klass)
 238 {
 239         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 240
 241         gobject_class->finalize = dvi_document_finalize;
 242
 243         mdvi_init_kpathsea ("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 244         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 245         mdvi_register_fonts ();
 246
 247         dvi_context_mutex = g_mutex_new ();
 248 }
 249
 250 static EvDocumentInfo *
 251 dvi_document_get_info (EvDocument *document)
 252 {
 253         EvDocumentInfo *info;
 254
 255         info = g_new0 (EvDocumentInfo, 1);
 256
 257         return info;
 258 }
 259
 260 static void
 261 dvi_document_document_iface_init (EvDocumentIface *iface)
 262 {
 263         iface->load = dvi_document_load;
 264         iface->save = dvi_document_save;
 265         iface->get_n_pages = dvi_document_get_n_pages;
 266         iface->get_page_size = dvi_document_get_page_size;
 267         iface->render = dvi_document_render;
 268         iface->get_info = dvi_document_get_info;
 269 }
 270
 271 static void
 272 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 273                                         EvRenderContext      *rc,
 274                                         gint                 *width,
 275                                         gint                 *height)
 276 {
 277         DviDocument *dvi_document = DVI_DOCUMENT (document);
 278         gdouble page_width = dvi_document->base_width;
 279         gdouble page_height = dvi_document->base_height;
 280
 281         if (rc->rotation == 90 || rc->rotation == 270) {
 282                 *width = (gint) (page_height * rc->scale);
 283                 *height = (gint) (page_width * rc->scale);
 284         } else {
 285                 *width = (gint) (page_width * rc->scale);
 286                 *height = (gint) (page_height * rc->scale);
 287         }
 288 }
 289
 290 static GdkPixbuf *
 291 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 292                                        EvRenderContext      *rc,
 293                                        gboolean              border)
 294 {
 295         DviDocument *dvi_document = DVI_DOCUMENT (document);
 296         GdkPixbuf *pixbuf;
 297         GdkPixbuf *rotated_pixbuf;
 298         cairo_surface_t *surface;
 299         gint thumb_width, thumb_height;
 300         gint proposed_width, proposed_height;
 301
 302         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 303         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 304
 305         g_mutex_lock (dvi_context_mutex);
 306
 307         mdvi_setpage (dvi_document->context, rc->page->index);
 308
 309         mdvi_set_shrink (dvi_document->context,
 310                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 311                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 312
 313         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 314         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 315
 316         if (border) {
 317                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 318                                                MAX (thumb_width - proposed_width, 0) / 2,
 319                                                MAX (thumb_height - proposed_height, 0) / 2);
 320         } else {
 321                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 322                                                MAX (thumb_width - proposed_width - 2, 0) / 2,
 323                                                MAX (thumb_height - proposed_height - 2, 0) / 2);
 324         }
 325
 326         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 327         mdvi_cairo_device_render (dvi_document->context);
 328         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 329         g_mutex_unlock (dvi_context_mutex);
 330
 331         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 332         cairo_surface_destroy (surface);
 333
 334         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 335         g_object_unref (pixbuf);
 336
 337         if (border) {
 338                 GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 339
 340                 rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 341                 g_object_unref (tmp_pixbuf);
 342         }
 343
 344         return rotated_pixbuf;
 345 }
 346
 347 static void
 348 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 349 {
 350         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 351         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 352 }
 353
 354 /* EvFileExporterIface */
 355 static void
 356 dvi_document_file_exporter_begin (EvFileExporter        *exporter,
 357                                   EvFileExporterContext *fc)
 358 {
 359         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 360
 361         if (dvi_document->exporter_filename)
 362                 g_free (dvi_document->exporter_filename);
 363         dvi_document->exporter_filename = g_strdup (fc->filename);
 364
 365         if (dvi_document->exporter_opts) {
 366                 g_string_free (dvi_document->exporter_opts, TRUE);
 367         }
 368         dvi_document->exporter_opts = g_string_new ("-s ");
 369 }
 370
 371 static void
 372 dvi_document_file_exporter_do_page (EvFileExporter  *exporter,
 373                                     EvRenderContext *rc)
 374 {
 375        DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 376
 377        g_string_append_printf (dvi_document->exporter_opts, "%d,", (rc->page->index) + 1);
 378 }
 379
 380 static void
 381 dvi_document_file_exporter_end (EvFileExporter *exporter)
 382 {
 383         gchar *command_line;
 384         gint exit_stat;
 385         GError *err = NULL;
 386         gboolean success;
 387
 388         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 389
 390         command_line = g_strdup_printf ("dvipdfm %s -o %s \"%s\"", /* dvipdfm -s 1,2,.., -o exporter_filename dvi_filename */
 391                                         dvi_document->exporter_opts->str,
 392                                         dvi_document->exporter_filename,
 393                                         dvi_document->context->filename);
 394
 395         success = g_spawn_command_line_sync (command_line,
 396                                              NULL,
 397                                              NULL,
 398                                              &exit_stat,
 399                                              &err);
 400
 401         g_free (command_line);
 402
 403         if (success == FALSE) {
 404                 g_warning ("Error: %s", err->message);
 405         } else if (exit_stat != 0) {
 406                 g_warning ("Error: dvipdfm exited with non-zero status.");
 407         }
 408
 409         if (err)
 410                 g_error_free (err);
 411 }
 412
 413 static EvFileExporterCapabilities
 414 dvi_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 415 {
 416         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 417                 EV_FILE_EXPORTER_CAN_COPIES |
 418                 EV_FILE_EXPORTER_CAN_COLLATE |
 419                 EV_FILE_EXPORTER_CAN_REVERSE |
 420                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 421 }
 422
 423 static void
 424 dvi_document_file_exporter_iface_init (EvFileExporterIface *iface)
 425 {
 426         iface->begin = dvi_document_file_exporter_begin;
 427         iface->do_page = dvi_document_file_exporter_do_page;
 428         iface->end = dvi_document_file_exporter_end;
 429         iface->get_capabilities = dvi_document_file_exporter_get_capabilities;
 430 }
 431
 432 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 433
 434 static gboolean
 435 hsb2rgb (float h, float s, float v, char *red, char *green, char *blue)
 436 {
 437         float i, f, p, q, t, r, g, b;
 438
 439         if (h == 360)
 440                 h = 0;
 441         else if ((h > 360) || (h < 0))
 442                 return FALSE;
 443
 444         s /= 100;
 445         v /= 100;
 446         h /= 60;
 447         i = floor (h);
 448         f = h - i;
 449         p = v * (1 - s);
 450         q = v * (1 - (s * f));
 451         t = v * (1 - (s * (1 - f)));
 452
 453         if (i == 0) {
 454                 r = v;
 455                 g = t;
 456                 b = p;
 457         } else if (i == 1) {
 458                 r = q;
 459                 g = v;
 460                 b = p;
 461         } else if (i == 2) {
 462                 r = p;
 463                 g = v;
 464                 b = t;
 465         } else if (i == 3) {
 466                 r = p;
 467                 g = q;
 468                 b = v;
 469         } else if (i == 4) {
 470                 r = t;
 471                 g = p;
 472                 b = v;
 473         } else if (i == 5) {
 474                 r = v;
 475                 g = p;
 476                 b = q;
 477         }
 478
 479         (*red) = (char)floor(r * 255);
 480         (*green) = (char)floor(g * 255);
 481         (*blue) = (char)floor(b * 255);
 482
 483         return TRUE;
 484 }
 485
 486 static void
 487 parse_color (const gchar *ptr,
 488              gdouble     *color,
 489              gint         n_color)
 490 {
 491         gchar *p = (gchar *)ptr;
 492         gint   i;
 493
 494         for (i = 0; i < n_color; i++) {
 495                 while (isspace (*p)) p++;
 496                 color[i] = g_ascii_strtod (p, NULL);
 497                 while (!isspace (*p) && *p != '\0') p++;
 498                 if (*p == '\0')
 499                         break;
 500         }
 501 }
 502
 503 static void
 504 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 505 {
 506         if (strncmp (arg, "pop", 3) == 0) {
 507                 mdvi_pop_color (dvi);
 508         } else if (strncmp (arg, "push", 4) == 0) {
 509                 /* Find color source: Named, CMYK or RGB */
 510                 const char *tmp = arg + 4;
 511
 512                 while (isspace (*tmp)) tmp++;
 513
 514                 if (!strncmp ("rgb", tmp, 3)) {
 515                         gdouble rgb[3];
 516                         guchar red, green, blue;
 517
 518                         parse_color (tmp + 4, rgb, 3);
 519
 520                         red = 255 * rgb[0];
 521                         green = 255 * rgb[1];
 522                         blue = 255 * rgb[2];
 523
 524                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 525                 } else if (!strncmp ("hsb", tmp, 4)) {
 526                         gdouble hsb[3];
 527                         guchar red, green, blue;
 528
 529                         parse_color (tmp + 4, hsb, 3);
 530
 531                         if (hsb2rgb (hsb[0], hsb[1], hsb[2], &red, &green, &blue))
 532                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 533                 } else if (!strncmp ("cmyk", tmp, 4)) {
 534                         gdouble cmyk[4];
 535                         double r, g, b;
 536                         guchar red, green, blue;
 537
 538                         parse_color (tmp + 5, cmyk, 4);
 539
 540                         r = 1.0 - cmyk[0] - cmyk[3];
 541                         if (r < 0.0)
 542                                 r = 0.0;
 543                         g = 1.0 - cmyk[1] - cmyk[3];
 544                         if (g < 0.0)
 545                                 g = 0.0;
 546                         b = 1.0 - cmyk[2] - cmyk[3];
 547                         if (b < 0.0)
 548                                 b = 0.0;
 549
 550                         red = r * 255 + 0.5;
 551                         green = g * 255 + 0.5;
 552                         blue = b * 255 + 0.5;
 553
 554                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 555                 } else if (!strncmp ("gray ", tmp, 5)) {
 556                         gdouble gray;
 557                         guchar rgb;
 558
 559                         parse_color (tmp + 5, &gray, 1);
 560
 561                         rgb = gray * 255 + 0.5;
 562
 563                         mdvi_push_color (dvi, RGB2ULONG (rgb, rgb, rgb), 0xFFFFFFFF);
 564                 } else {
 565                         GdkColor color;
 566
 567                         if (gdk_color_parse (tmp, &color)) {
 568                                 guchar red, green, blue;
 569
 570                                 red = color.red * 255 / 65535.;
 571                                 green = color.green * 255 / 65535.;
 572                                 blue = color.blue * 255 / 65535.;
 573
 574                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 575                         }
 576                 }
 577         }
 578 }
 579
 580 static void
 581 dvi_document_init_params (DviDocument *dvi_document)
 582 {
 583         dvi_document->params = g_new0 (DviParams, 1);
 584
 585         dvi_document->params->dpi      = MDVI_DPI;
 586         dvi_document->params->vdpi     = MDVI_VDPI;
 587         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 588         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 589         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 590         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 591         dvi_document->params->hdrift   = 0;
 592         dvi_document->params->vdrift   = 0;
 593         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 594         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 595         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 596
 597         dvi_document->spec = NULL;
 598
 599         dvi_document->params->bg = 0xffffffff;
 600         dvi_document->params->fg = 0xff000000;
 601 }
 602
 603 static void
 604 dvi_document_init (DviDocument *dvi_document)
 605 {
 606         dvi_document->context = NULL;
 607         dvi_document_init_params (dvi_document);
 608
 609         dvi_document->exporter_filename = NULL;
 610         dvi_document->exporter_opts = NULL;
 611 }