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 "dvi-document.h"
  23 #include "ev-document-thumbnails.h"
  24 #include "ev-document-misc.h"
  25 #include "ev-file-exporter.h"
  26
  27 #include "mdvi.h"
  28 #include "fonts.h"
  29 #include "cairo-device.h"
  30
  31 #include <glib/gi18n.h>
  32
  33 GMutex *dvi_context_mutex = NULL;
  34
  35 enum {
  36         PROP_0,
  37         PROP_TITLE
  38 };
  39
  40 struct _DviDocumentClass
  41 {
  42         GObjectClass parent_class;
  43 };
  44
  45 struct _DviDocument
  46 {
  47         GObject parent_instance;
  48
  49         DviContext *context;
  50         DviPageSpec *spec;
  51         DviParams *params;
  52
  53         /* To let document scale we should remember width and height */
  54         double base_width;
  55         double base_height;
  56
  57         gchar *uri;
  58
  59         /* PDF exporter */
  60         gchar            *exporter_filename;
  61         GString          *exporter_opts;
  62 };
  63
  64 typedef struct _DviDocumentClass DviDocumentClass;
  65
  66 static void dvi_document_document_iface_init            (EvDocumentIface           *iface);
  67 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  68 static void dvi_document_file_exporter_iface_init       (EvFileExporterIface       *iface);
  69 static void dvi_document_get_page_size                  (EvDocument                *document,
  70                                                          int                        page,
  71                                                          double                    *width,
  72                                                          double                    *height);
  73 static void dvi_document_do_color_special               (DviContext                *dvi,
  74                                                          const char                *prefix,
  75                                                          const char                *arg);
  76
  77 EV_BACKEND_REGISTER_WITH_CODE (DviDocument, dvi_document,
  78      {
  79       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init);
  80       G_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER, dvi_document_file_exporter_iface_init);
  81      });
  82
  83 static gboolean
  84 dvi_document_load (EvDocument  *document,
  85                    const char  *uri,
  86                    GError     **error)
  87 {
  88         gchar *filename;
  89         DviDocument *dvi_document = DVI_DOCUMENT(document);
  90
  91         filename = g_filename_from_uri (uri, NULL, error);
  92
  93         if (!filename) {
  94                 g_set_error (error,
  95                              EV_DOCUMENT_ERROR,
  96                              EV_DOCUMENT_ERROR_INVALID,
  97                              _("File not available"));
  98                 return FALSE;
  99         }
 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
 108         if (!dvi_document->context) {
 109                 g_set_error (error,
 110                              EV_DOCUMENT_ERROR,
 111                              EV_DOCUMENT_ERROR_INVALID,
 112                              _("DVI document has incorrect format"));
 113                 return FALSE;
 114         }
 115
 116         mdvi_cairo_device_init (&dvi_document->context->device);
 117
 118
 119         dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 120                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 121
 122         dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 123                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 124
 125         g_free (dvi_document->uri);
 126         dvi_document->uri = g_strdup (uri);
 127
 128         return TRUE;
 129 }
 130
 131
 132 static gboolean
 133 dvi_document_save (EvDocument  *document,
 134                       const char  *uri,
 135                       GError     **error)
 136 {
 137         DviDocument *dvi_document = DVI_DOCUMENT (document);
 138
 139         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 140 }
 141
 142 static int
 143 dvi_document_get_n_pages (EvDocument *document)
 144 {
 145         DviDocument *dvi_document = DVI_DOCUMENT (document);
 146
 147         return dvi_document->context->npages;
 148 }
 149
 150 static void
 151 dvi_document_get_page_size (EvDocument *document,
 152                             int         page,
 153                             double     *width,
 154                             double     *height)
 155 {
 156         DviDocument *dvi_document = DVI_DOCUMENT (document);
 157
 158         *width = dvi_document->base_width;
 159         *height = dvi_document->base_height;;
 160 }
 161
 162 static cairo_surface_t *
 163 dvi_document_render (EvDocument      *document,
 164                      EvRenderContext *rc)
 165 {
 166         cairo_surface_t *surface;
 167         cairo_surface_t *rotated_surface;
 168         DviDocument *dvi_document = DVI_DOCUMENT(document);
 169         gint required_width, required_height;
 170         gint proposed_width, proposed_height;
 171         gint xmargin = 0, ymargin = 0;
 172
 173         /* We should protect our context since it's not
 174          * thread safe. The work to the future -
 175          * let context render page independently
 176          */
 177         g_mutex_lock (dvi_context_mutex);
 178
 179         mdvi_setpage (dvi_document->context, rc->page);
 180
 181         mdvi_set_shrink (dvi_document->context,
 182                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 183                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 184
 185         required_width = dvi_document->base_width * rc->scale + 0.5;
 186         required_height = dvi_document->base_height * rc->scale + 0.5;
 187         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 188         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 189
 190         if (required_width >= proposed_width)
 191             xmargin = (required_width - proposed_width) / 2;
 192         if (required_height >= proposed_height)
 193             ymargin = (required_height - proposed_height) / 2;
 194
 195         mdvi_cairo_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 196         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 197         mdvi_cairo_device_render (dvi_document->context);
 198         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 199
 200         g_mutex_unlock (dvi_context_mutex);
 201
 202         rotated_surface = ev_document_misc_surface_rotate_and_scale (surface,
 203                                                                      required_width,
 204                                                                      required_height,
 205                                                                      rc->rotation);
 206         cairo_surface_destroy (surface);
 207
 208         return rotated_surface;
 209 }
 210
 211 static void
 212 dvi_document_finalize (GObject *object)
 213 {
 214         DviDocument *dvi_document = DVI_DOCUMENT(object);
 215
 216         g_mutex_lock (dvi_context_mutex);
 217         if (dvi_document->context) {
 218                 mdvi_cairo_device_free (&dvi_document->context->device);
 219                 mdvi_destroy_context (dvi_document->context);
 220         }
 221         g_mutex_unlock (dvi_context_mutex);
 222
 223         if (dvi_document->params)
 224                 g_free (dvi_document->params);
 225
 226         if (dvi_document->exporter_filename)
 227                 g_free (dvi_document->exporter_filename);
 228
 229         if (dvi_document->exporter_opts)
 230                 g_string_free (dvi_document->exporter_opts, TRUE);
 231
 232         g_free (dvi_document->uri);
 233
 234         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 235 }
 236
 237
 238 static void
 239 dvi_document_class_init (DviDocumentClass *klass)
 240 {
 241         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 242
 243         gobject_class->finalize = dvi_document_finalize;
 244
 245         mdvi_init_kpathsea ("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 246         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 247         mdvi_register_fonts ();
 248
 249         dvi_context_mutex = g_mutex_new ();
 250 }
 251
 252 static EvDocumentInfo *
 253 dvi_document_get_info (EvDocument *document)
 254 {
 255         EvDocumentInfo *info;
 256
 257         info = g_new0 (EvDocumentInfo, 1);
 258
 259         return info;
 260 }
 261
 262 static void
 263 dvi_document_document_iface_init (EvDocumentIface *iface)
 264 {
 265         iface->load = dvi_document_load;
 266         iface->save = dvi_document_save;
 267         iface->get_n_pages = dvi_document_get_n_pages;
 268         iface->get_page_size = dvi_document_get_page_size;
 269         iface->render = dvi_document_render;
 270         iface->get_info = dvi_document_get_info;
 271 }
 272
 273 static void
 274 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 275                                         EvRenderContext      *rc,
 276                                         gint                  *width,
 277                                         gint                  *height)
 278 {
 279         DviDocument *dvi_document = DVI_DOCUMENT (document);
 280         gdouble page_width = dvi_document->base_width;
 281         gdouble page_height = dvi_document->base_height;
 282
 283         if (rc->rotation == 90 || rc->rotation == 270) {
 284                 *width = (gint) (page_height * rc->scale);
 285                 *height = (gint) (page_width * rc->scale);
 286         } else {
 287                 *width = (gint) (page_width * rc->scale);
 288                 *height = (gint) (page_height * rc->scale);
 289         }
 290 }
 291
 292 static GdkPixbuf *
 293 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 294                                        EvRenderContext      *rc,
 295                                        gboolean              border)
 296 {
 297         DviDocument *dvi_document = DVI_DOCUMENT (document);
 298         GdkPixbuf *pixbuf;
 299         GdkPixbuf *rotated_pixbuf;
 300         cairo_surface_t *surface;
 301         gint thumb_width, thumb_height;
 302         gint proposed_width, proposed_height;
 303
 304         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 305         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 306
 307         g_mutex_lock (dvi_context_mutex);
 308
 309         mdvi_setpage (dvi_document->context, rc->page);
 310
 311         mdvi_set_shrink (dvi_document->context,
 312                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 313                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 314
 315         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 316         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 317
 318         if (border) {
 319                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 320                                                MAX (thumb_width - proposed_width, 0) / 2,
 321                                                MAX (thumb_height - proposed_height, 0) / 2);
 322         } else {
 323                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 324                                                MAX (thumb_width - proposed_width - 2, 0) / 2,
 325                                                MAX (thumb_height - proposed_height - 2, 0) / 2);
 326         }
 327
 328         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 329         mdvi_cairo_device_render (dvi_document->context);
 330         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 331         g_mutex_unlock (dvi_context_mutex);
 332
 333         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 334         cairo_surface_destroy (surface);
 335
 336         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 337         g_object_unref (pixbuf);
 338
 339         if (border) {
 340                 GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 341
 342                 rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 343                 g_object_unref (tmp_pixbuf);
 344         }
 345
 346         return rotated_pixbuf;
 347 }
 348
 349 static void
 350 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 351 {
 352         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 353         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 354 }
 355
 356 /* EvFileExporterIface */
 357 static void
 358 dvi_document_file_exporter_begin (EvFileExporter        *exporter,
 359                                   EvFileExporterContext *fc)
 360 {
 361         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 362
 363         if (dvi_document->exporter_filename)
 364                 g_free (dvi_document->exporter_filename);
 365         dvi_document->exporter_filename = g_strdup(fc->filename);
 366
 367         if (dvi_document->exporter_opts) {
 368                 g_string_free (dvi_document->exporter_opts, TRUE);
 369         }
 370         dvi_document->exporter_opts = g_string_new ("-s ");
 371 }
 372
 373 static void
 374 dvi_document_file_exporter_do_page (EvFileExporter  *exporter,
 375                                     EvRenderContext *rc)
 376 {
 377        DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 378
 379        g_string_append_printf(dvi_document->exporter_opts, "%d,", (rc->page)+1);
 380 }
 381
 382 static void
 383 dvi_document_file_exporter_end (EvFileExporter *exporter)
 384 {
 385         gchar *command_line;
 386         gint exit_stat;
 387         GError *err = NULL;
 388         gboolean success;
 389
 390         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 391
 392         command_line = g_strdup_printf ("dvipdfm %s -o %s %s", /* dvipdfm -s 1,2,.., -o exporter_filename dvi_filename */
 393                                         dvi_document->exporter_opts->str,
 394                                         dvi_document->exporter_filename,
 395                                         dvi_document->context->filename);
 396
 397         success = g_spawn_command_line_sync (command_line,
 398                                              NULL,
 399                                              NULL,
 400                                              &exit_stat,
 401                                              &err);
 402
 403         g_free(command_line);
 404
 405         if (success == FALSE) {
 406                 g_warning ("Error: %s", err->message);
 407         } else if (exit_stat != 0) {
 408                 g_warning ("Error: dvipdfm exited with non-zero status.");
 409         }
 410
 411         if (err)
 412                 g_error_free(err);
 413 }
 414
 415 static EvFileExporterCapabilities
 416 dvi_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 417 {
 418         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 419                 EV_FILE_EXPORTER_CAN_COPIES |
 420                 EV_FILE_EXPORTER_CAN_COLLATE |
 421                 EV_FILE_EXPORTER_CAN_REVERSE |
 422                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 423 }
 424
 425 static void
 426 dvi_document_file_exporter_iface_init (EvFileExporterIface *iface)
 427 {
 428         iface->begin = dvi_document_file_exporter_begin;
 429         iface->do_page = dvi_document_file_exporter_do_page;
 430         iface->end = dvi_document_file_exporter_end;
 431         iface->get_capabilities = dvi_document_file_exporter_get_capabilities;
 432 }
 433
 434 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 435
 436 static gboolean
 437 hsb2rgb (float h, float s, float v, char *red, char *green, char *blue)
 438 {
 439         float i, f, p, q, t, r, g, b;
 440
 441         if (h == 360)
 442                 h = 0;
 443         else if ((h > 360) || (h < 0))
 444                 return FALSE;
 445
 446         s /= 100;
 447         v /= 100;
 448         h /= 60;
 449         i = floor (h);
 450         f = h - i;
 451         p = v * (1 - s);
 452         q = v * (1 - (s * f));
 453         t = v * (1 - (s * (1 - f)));
 454
 455         if (i == 0) {
 456                 r = v;
 457                 g = t;
 458                 b = p;
 459         } else if (i == 1) {
 460                 r = q;
 461                 g = v;
 462                 b = p;
 463         } else if (i == 2) {
 464                 r = p;
 465                 g = v;
 466                 b = t;
 467         } else if (i == 3) {
 468                 r = p;
 469                 g = q;
 470                 b = v;
 471         } else if (i == 4) {
 472                 r = t;
 473                 g = p;
 474                 b = v;
 475         } else if (i == 5) {
 476                 r = v;
 477                 g = p;
 478                 b = q;
 479         }
 480
 481         (*red) = (char)floor(r * 255);
 482         (*green) = (char)floor(g * 255);
 483         (*blue) = (char)floor(b * 255);
 484
 485         return TRUE;
 486 }
 487
 488 static void
 489 parse_color (const gchar *ptr,
 490              gdouble     *color,
 491              gint         n_color)
 492 {
 493         gchar *p = (gchar *)ptr;
 494         gint   i;
 495
 496         for (i = 0; i < n_color; i++) {
 497                 while (isspace (*p)) p++;
 498                 color[i] = g_ascii_strtod (p, NULL);
 499                 while (!isspace (*p) && *p != '\0') p++;
 500                 if (*p == '\0')
 501                         break;
 502         }
 503 }
 504
 505 static void
 506 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 507 {
 508         if (strncmp (arg, "pop", 3) == 0) {
 509                 mdvi_pop_color (dvi);
 510         } else if (strncmp (arg, "push", 4) == 0) {
 511                 /* Find color source: Named, CMYK or RGB */
 512                 const char *tmp = arg + 4;
 513
 514                 while (isspace (*tmp)) tmp++;
 515
 516                 if (!strncmp ("rgb", tmp, 3)) {
 517                         gdouble rgb[3];
 518                         guchar red, green, blue;
 519
 520                         parse_color (tmp + 4, rgb, 3);
 521
 522                         red = 255 * rgb[0];
 523                         green = 255 * rgb[1];
 524                         blue = 255 * rgb[2];
 525
 526                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 527                 } else if (!strncmp ("hsb", tmp, 4)) {
 528                         gdouble hsb[3];
 529                         guchar red, green, blue;
 530
 531                         parse_color (tmp + 4, hsb, 3);
 532
 533                         if (hsb2rgb (hsb[0], hsb[1], hsb[2], &red, &green, &blue))
 534                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 535                 } else if (!strncmp ("cmyk", tmp, 4)) {
 536                         gdouble cmyk[4];
 537                         double r, g, b;
 538                         guchar red, green, blue;
 539
 540                         parse_color (tmp + 5, cmyk, 4);
 541
 542                         r = 1.0 - cmyk[0] - cmyk[3];
 543                         if (r < 0.0)
 544                                 r = 0.0;
 545                         g = 1.0 - cmyk[1] - cmyk[3];
 546                         if (g < 0.0)
 547                                 g = 0.0;
 548                         b = 1.0 - cmyk[2] - cmyk[3];
 549                         if (b < 0.0)
 550                                 b = 0.0;
 551
 552                         red = r * 255 + 0.5;
 553                         green = g * 255 + 0.5;
 554                         blue = b * 255 + 0.5;
 555
 556                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 557                 } else if (!strncmp ("gray ", tmp, 5)) {
 558                         gdouble gray;
 559                         guchar rgb;
 560
 561                         parse_color (tmp + 5, &gray, 1);
 562
 563                         rgb = gray * 255 + 0.5;
 564
 565                         mdvi_push_color (dvi, RGB2ULONG (rgb, rgb, rgb), 0xFFFFFFFF);
 566                 } else {
 567                         GdkColor color;
 568
 569                         if (gdk_color_parse (tmp, &color)) {
 570                                 guchar red, green, blue;
 571
 572                                 red = color.red * 255 / 65535.;
 573                                 green = color.green * 255 / 65535.;
 574                                 blue = color.blue * 255 / 65535.;
 575
 576                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 577                         }
 578                 }
 579         }
 580 }
 581
 582 static void
 583 dvi_document_init_params (DviDocument *dvi_document)
 584 {
 585         dvi_document->params = g_new0 (DviParams, 1);
 586
 587         dvi_document->params->dpi      = MDVI_DPI;
 588         dvi_document->params->vdpi     = MDVI_VDPI;
 589         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 590         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 591         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 592         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 593         dvi_document->params->hdrift   = 0;
 594         dvi_document->params->vdrift   = 0;
 595         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 596         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 597         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 598
 599         dvi_document->spec = NULL;
 600
 601         dvi_document->params->bg = 0xffffffff;
 602         dvi_document->params->fg = 0xff000000;
 603 }
 604
 605 static void
 606 dvi_document_init (DviDocument *dvi_document)
 607 {
 608         dvi_document->context = NULL;
 609         dvi_document_init_params (dvi_document);
 610
 611         dvi_document->exporter_filename = NULL;
 612         dvi_document->exporter_opts = NULL;
 613 }