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 gboolean
 239 dvi_document_support_synctex (EvDocument *document)
 240 {
 241         return TRUE;
 242 }
 243
 244 static void
 245 dvi_document_class_init (DviDocumentClass *klass)
 246 {
 247         GObjectClass    *gobject_class = G_OBJECT_CLASS (klass);
 248         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 249         gchar *texmfcnf;
 250
 251         gobject_class->finalize = dvi_document_finalize;
 252
 253         texmfcnf = get_texmfcnf();
 254         mdvi_init_kpathsea ("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI, texmfcnf);
 255         g_free(texmfcnf);
 256
 257         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 258         mdvi_register_fonts ();
 259
 260         dvi_context_mutex = g_mutex_new ();
 261
 262         ev_document_class->load = dvi_document_load;
 263         ev_document_class->save = dvi_document_save;
 264         ev_document_class->get_n_pages = dvi_document_get_n_pages;
 265         ev_document_class->get_page_size = dvi_document_get_page_size;
 266         ev_document_class->render = dvi_document_render;
 267         ev_document_class->support_synctex = dvi_document_support_synctex;
 268 }
 269
 270 static void
 271 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 272                                         EvRenderContext      *rc,
 273                                         gint                 *width,
 274                                         gint                 *height)
 275 {
 276         DviDocument *dvi_document = DVI_DOCUMENT (document);
 277         gdouble page_width = dvi_document->base_width;
 278         gdouble page_height = dvi_document->base_height;
 279
 280         if (rc->rotation == 90 || rc->rotation == 270) {
 281                 *width = (gint) (page_height * rc->scale);
 282                 *height = (gint) (page_width * rc->scale);
 283         } else {
 284                 *width = (gint) (page_width * rc->scale);
 285                 *height = (gint) (page_height * rc->scale);
 286         }
 287 }
 288
 289 static GdkPixbuf *
 290 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 291                                        EvRenderContext      *rc,
 292                                        gboolean              border)
 293 {
 294         DviDocument *dvi_document = DVI_DOCUMENT (document);
 295         GdkPixbuf *pixbuf;
 296         GdkPixbuf *rotated_pixbuf;
 297         cairo_surface_t *surface;
 298         gint thumb_width, thumb_height;
 299         gint proposed_width, proposed_height;
 300
 301         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 302         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 303
 304         g_mutex_lock (dvi_context_mutex);
 305
 306         mdvi_setpage (dvi_document->context, rc->page->index);
 307
 308         mdvi_set_shrink (dvi_document->context,
 309                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 310                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 311
 312         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 313         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 314
 315         if (border) {
 316                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 317                                                MAX (thumb_width - proposed_width, 0) / 2,
 318                                                MAX (thumb_height - proposed_height, 0) / 2);
 319         } else {
 320                 mdvi_cairo_device_set_margins (&dvi_document->context->device,
 321                                                MAX (thumb_width - proposed_width - 2, 0) / 2,
 322                                                MAX (thumb_height - proposed_height - 2, 0) / 2);
 323         }
 324
 325         mdvi_cairo_device_set_scale (&dvi_document->context->device, rc->scale);
 326         mdvi_cairo_device_render (dvi_document->context);
 327         surface = mdvi_cairo_device_get_surface (&dvi_document->context->device);
 328         g_mutex_unlock (dvi_context_mutex);
 329
 330         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 331         cairo_surface_destroy (surface);
 332
 333         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 334         g_object_unref (pixbuf);
 335
 336         if (border) {
 337                 GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 338
 339                 rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 340                 g_object_unref (tmp_pixbuf);
 341         }
 342
 343         return rotated_pixbuf;
 344 }
 345
 346 static void
 347 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
 348 {
 349         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 350         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 351 }
 352
 353 /* EvFileExporterIface */
 354 static void
 355 dvi_document_file_exporter_begin (EvFileExporter        *exporter,
 356                                   EvFileExporterContext *fc)
 357 {
 358         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 359
 360         if (dvi_document->exporter_filename)
 361                 g_free (dvi_document->exporter_filename);
 362         dvi_document->exporter_filename = g_strdup (fc->filename);
 363
 364         if (dvi_document->exporter_opts) {
 365                 g_string_free (dvi_document->exporter_opts, TRUE);
 366         }
 367         dvi_document->exporter_opts = g_string_new ("-s ");
 368 }
 369
 370 static void
 371 dvi_document_file_exporter_do_page (EvFileExporter  *exporter,
 372                                     EvRenderContext *rc)
 373 {
 374        DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 375
 376        g_string_append_printf (dvi_document->exporter_opts, "%d,", (rc->page->index) + 1);
 377 }
 378
 379 static void
 380 dvi_document_file_exporter_end (EvFileExporter *exporter)
 381 {
 382         gchar *command_line;
 383         gint exit_stat;
 384         GError *err = NULL;
 385         gboolean success;
 386
 387         DviDocument *dvi_document = DVI_DOCUMENT(exporter);
 388
 389         command_line = g_strdup_printf ("dvipdfm %s -o %s \"%s\"", /* dvipdfm -s 1,2,.., -o exporter_filename dvi_filename */
 390                                         dvi_document->exporter_opts->str,
 391                                         dvi_document->exporter_filename,
 392                                         dvi_document->context->filename);
 393
 394         success = g_spawn_command_line_sync (command_line,
 395                                              NULL,
 396                                              NULL,
 397                                              &exit_stat,
 398                                              &err);
 399
 400         g_free (command_line);
 401
 402         if (success == FALSE) {
 403                 g_warning ("Error: %s", err->message);
 404         } else if (!WIFEXITED(exit_stat) || WEXITSTATUS(exit_stat) != EXIT_SUCCESS){
 405                 g_warning ("Error: dvipdfm does not end normally or exit with a failure status.");
 406         }
 407
 408         if (err)
 409                 g_error_free (err);
 410 }
 411
 412 static EvFileExporterCapabilities
 413 dvi_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 414 {
 415         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 416                 EV_FILE_EXPORTER_CAN_COPIES |
 417                 EV_FILE_EXPORTER_CAN_COLLATE |
 418                 EV_FILE_EXPORTER_CAN_REVERSE |
 419                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 420 }
 421
 422 static void
 423 dvi_document_file_exporter_iface_init (EvFileExporterInterface *iface)
 424 {
 425         iface->begin = dvi_document_file_exporter_begin;
 426         iface->do_page = dvi_document_file_exporter_do_page;
 427         iface->end = dvi_document_file_exporter_end;
 428         iface->get_capabilities = dvi_document_file_exporter_get_capabilities;
 429 }
 430
 431 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 432
 433 static gboolean
 434 hsb2rgb (float h, float s, float v, guchar *red, guchar *green, guchar *blue)
 435 {
 436         float i, f, p, q, t, r, g, b;
 437
 438         if (h == 360)
 439                 h = 0;
 440         else if ((h > 360) || (h < 0))
 441                 return FALSE;
 442
 443         s /= 100;
 444         v /= 100;
 445         h /= 60;
 446         i = floor (h);
 447         f = h - i;
 448         p = v * (1 - s);
 449         q = v * (1 - (s * f));
 450         t = v * (1 - (s * (1 - f)));
 451
 452         if (i == 0) {
 453                 r = v;
 454                 g = t;
 455                 b = p;
 456         } else if (i == 1) {
 457                 r = q;
 458                 g = v;
 459                 b = p;
 460         } else if (i == 2) {
 461                 r = p;
 462                 g = v;
 463                 b = t;
 464         } else if (i == 3) {
 465                 r = p;
 466                 g = q;
 467                 b = v;
 468         } else if (i == 4) {
 469                 r = t;
 470                 g = p;
 471                 b = v;
 472         } else if (i == 5) {
 473                 r = v;
 474                 g = p;
 475                 b = q;
 476         }
 477
 478         *red   = (guchar)floor(r * 255.0);
 479         *green = (guchar)floor(g * 255.0);
 480         *blue  = (guchar)floor(b * 255.0);
 481
 482         return TRUE;
 483 }
 484
 485 static void
 486 parse_color (const gchar *ptr,
 487              gdouble     *color,
 488              gint         n_color)
 489 {
 490         gchar *p = (gchar *)ptr;
 491         gint   i;
 492
 493         for (i = 0; i < n_color; i++) {
 494                 while (isspace (*p)) p++;
 495                 color[i] = g_ascii_strtod (p, NULL);
 496                 while (!isspace (*p) && *p != '\0') p++;
 497                 if (*p == '\0')
 498                         break;
 499         }
 500 }
 501
 502 static void
 503 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 504 {
 505         if (strncmp (arg, "pop", 3) == 0) {
 506                 mdvi_pop_color (dvi);
 507         } else if (strncmp (arg, "push", 4) == 0) {
 508                 /* Find color source: Named, CMYK or RGB */
 509                 const char *tmp = arg + 4;
 510
 511                 while (isspace (*tmp)) tmp++;
 512
 513                 if (!strncmp ("rgb", tmp, 3)) {
 514                         gdouble rgb[3];
 515                         guchar red, green, blue;
 516
 517                         parse_color (tmp + 4, rgb, 3);
 518
 519                         red = 255 * rgb[0];
 520                         green = 255 * rgb[1];
 521                         blue = 255 * rgb[2];
 522
 523                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 524                 } else if (!strncmp ("hsb", tmp, 4)) {
 525                         gdouble hsb[3];
 526                         guchar red, green, blue;
 527
 528                         parse_color (tmp + 4, hsb, 3);
 529
 530                         if (hsb2rgb (hsb[0], hsb[1], hsb[2], &red, &green, &blue))
 531                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 532                 } else if (!strncmp ("cmyk", tmp, 4)) {
 533                         gdouble cmyk[4];
 534                         double r, g, b;
 535                         guchar red, green, blue;
 536
 537                         parse_color (tmp + 5, cmyk, 4);
 538
 539                         r = 1.0 - cmyk[0] - cmyk[3];
 540                         if (r < 0.0)
 541                                 r = 0.0;
 542                         g = 1.0 - cmyk[1] - cmyk[3];
 543                         if (g < 0.0)
 544                                 g = 0.0;
 545                         b = 1.0 - cmyk[2] - cmyk[3];
 546                         if (b < 0.0)
 547                                 b = 0.0;
 548
 549                         red = r * 255 + 0.5;
 550                         green = g * 255 + 0.5;
 551                         blue = b * 255 + 0.5;
 552
 553                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 554                 } else if (!strncmp ("gray ", tmp, 5)) {
 555                         gdouble gray;
 556                         guchar rgb;
 557
 558                         parse_color (tmp + 5, &gray, 1);
 559
 560                         rgb = gray * 255 + 0.5;
 561
 562                         mdvi_push_color (dvi, RGB2ULONG (rgb, rgb, rgb), 0xFFFFFFFF);
 563                 } else {
 564                         GdkColor color;
 565
 566                         if (gdk_color_parse (tmp, &color)) {
 567                                 guchar red, green, blue;
 568
 569                                 red = color.red * 255 / 65535.;
 570                                 green = color.green * 255 / 65535.;
 571                                 blue = color.blue * 255 / 65535.;
 572
 573                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 574                         }
 575                 }
 576         }
 577 }
 578
 579 static void
 580 dvi_document_init_params (DviDocument *dvi_document)
 581 {
 582         dvi_document->params = g_new0 (DviParams, 1);
 583
 584         dvi_document->params->dpi      = MDVI_DPI;
 585         dvi_document->params->vdpi     = MDVI_VDPI;
 586         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 587         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 588         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 589         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 590         dvi_document->params->hdrift   = 0;
 591         dvi_document->params->vdrift   = 0;
 592         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 593         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 594         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 595
 596         dvi_document->spec = NULL;
 597
 598         dvi_document->params->bg = 0xffffffff;
 599         dvi_document->params->fg = 0xff000000;
 600 }
 601
 602 static void
 603 dvi_document_init (DviDocument *dvi_document)
 604 {
 605         dvi_document->context = NULL;
 606         dvi_document_init_params (dvi_document);
 607
 608         dvi_document->exporter_filename = NULL;
 609         dvi_document->exporter_opts = NULL;
 610 }