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