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
  26 #include "mdvi.h"
  27 #include "fonts.h"
  28 #include "pixbuf-device.h"
  29
  30 #include <gtk/gtk.h>
  31 #include <glib/gi18n.h>
  32 #include <libgnomevfs/gnome-vfs-uri.h>
  33 #include <libgnomevfs/gnome-vfs-utils.h>
  34 #include <libgnomevfs/gnome-vfs-ops.h>
  35 #include <libgnomevfs/gnome-vfs-xfer.h>
  36
  37 GMutex *dvi_context_mutex = NULL;
  38
  39 enum {
  40         PROP_0,
  41         PROP_TITLE
  42 };
  43
  44 struct _DviDocumentClass
  45 {
  46         GObjectClass parent_class;
  47 };
  48
  49 struct _DviDocument
  50 {
  51         GObject parent_instance;
  52
  53         DviContext *context;
  54         DviPageSpec *spec;
  55         DviParams *params;
  56
  57         /* To let document scale we should remember width and height */
  58
  59         double base_width;
  60         double base_height;
  61
  62         gchar *uri;
  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_get_page_size                  (EvDocument   *document,
  70                                                          int       page,
  71                                                          double    *width,
  72                                                          double    *height);
  73
  74 G_DEFINE_TYPE_WITH_CODE
  75     (DviDocument, dvi_document, G_TYPE_OBJECT,
  76     {
  77       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, dvi_document_document_iface_init);
  78       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init)
  79      });
  80
  81 static gboolean
  82 dvi_document_load (EvDocument  *document,
  83                       const char  *uri,
  84                       GError     **error)
  85 {
  86     gchar *filename;
  87     DviDocument *dvi_document = DVI_DOCUMENT(document);
  88
  89     filename = g_filename_from_uri (uri, NULL, error);
  90
  91     if (!filename) {
  92                 g_set_error (error,
  93                              EV_DOCUMENT_ERROR,
  94                              EV_DOCUMENT_ERROR_INVALID,
  95                              _("File not available"));
  96                 return FALSE;
  97     }
  98
  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
 104     if (!dvi_document->context) {
 105                 g_set_error (error,
 106                              EV_DOCUMENT_ERROR,
 107                              EV_DOCUMENT_ERROR_INVALID,
 108                              _("DVI document has incorrect format"));
 109                 return FALSE;
 110     }
 111
 112     mdvi_pixbuf_device_init (&dvi_document->context->device);
 113
 114     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 115                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 116
 117     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 118                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 119
 120     dvi_context_mutex = g_mutex_new ();
 121
 122     g_free (dvi_document->uri);
 123     dvi_document->uri = g_strdup (uri);
 124
 125     return TRUE;
 126 }
 127
 128
 129 static gboolean
 130 dvi_document_save (EvDocument  *document,
 131                       const char  *uri,
 132                       GError     **error)
 133 {
 134         DviDocument *dvi_document = DVI_DOCUMENT (document);
 135         GnomeVFSResult result;
 136         GnomeVFSURI *source_uri;
 137         GnomeVFSURI *target_uri;
 138
 139         if (!dvi_document->uri)
 140                 return FALSE;
 141
 142         source_uri = gnome_vfs_uri_new (dvi_document->uri);
 143         target_uri = gnome_vfs_uri_new (uri);
 144
 145         result = gnome_vfs_xfer_uri (source_uri, target_uri,
 146                                      GNOME_VFS_XFER_DEFAULT | GNOME_VFS_XFER_FOLLOW_LINKS,
 147                                      GNOME_VFS_XFER_ERROR_MODE_ABORT,
 148                                      GNOME_VFS_XFER_OVERWRITE_MODE_REPLACE,
 149                                      NULL,
 150                                      NULL);
 151         gnome_vfs_uri_unref (target_uri);
 152         gnome_vfs_uri_unref (source_uri);
 153
 154         if (result != GNOME_VFS_OK)
 155                 g_set_error (error,
 156                              EV_DOCUMENT_ERROR,
 157                              0,
 158                              gnome_vfs_result_to_string (result));
 159         return (result == GNOME_VFS_OK);
 160         return TRUE;
 161 }
 162
 163 static int
 164 dvi_document_get_n_pages (EvDocument  *document)
 165 {
 166     DviDocument *dvi_document = DVI_DOCUMENT (document);
 167     return dvi_document->context->npages;
 168 }
 169
 170 static void
 171 dvi_document_get_page_size (EvDocument   *document,
 172                             int       page,
 173                             double    *width,
 174                             double    *height)
 175 {
 176         DviDocument * dvi_document = DVI_DOCUMENT (document);
 177
 178         *width = dvi_document->base_width;
 179         *height = dvi_document->base_height;;
 180
 181         return;
 182 }
 183
 184 static GdkPixbuf *
 185 dvi_document_render_pixbuf (EvDocument  *document,
 186                             EvRenderContext *rc)
 187 {
 188         GdkPixbuf *pixbuf;
 189         GdkPixbuf *rotated_pixbuf;
 190
 191         DviDocument *dvi_document = DVI_DOCUMENT(document);
 192
 193         gint required_width, required_height;
 194         gint proposed_width, proposed_height;
 195         gint xmargin = 0, ymargin = 0;
 196
 197         /* We should protect our context since it's not
 198          * thread safe. The work to the future -
 199          * let context render page independently
 200          */
 201         g_mutex_lock (dvi_context_mutex);
 202
 203         mdvi_setpage(dvi_document->context,  rc->page);
 204
 205         mdvi_set_shrink (dvi_document->context,
 206                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 207                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 208
 209         required_width = dvi_document->base_width * rc->scale;
 210         required_height = dvi_document->base_height * rc->scale;
 211         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 212         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 213
 214         if (required_width >= proposed_width)
 215             xmargin = (required_width - proposed_width) / 2;
 216         if (required_height >= proposed_height)
 217             ymargin = (required_height - proposed_height) / 2;
 218
 219         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 220
 221         mdvi_pixbuf_device_render (dvi_document->context);
 222
 223         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 224
 225         g_mutex_unlock (dvi_context_mutex);
 226
 227         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 228         g_object_unref (pixbuf);
 229
 230         return rotated_pixbuf;
 231 }
 232
 233 static void
 234 dvi_document_finalize (GObject *object)
 235 {
 236         DviDocument *dvi_document = DVI_DOCUMENT(object);
 237
 238         if (dvi_document->context)
 239             {
 240                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 241                 mdvi_destroy_context (dvi_document->context);
 242             }
 243
 244         if (dvi_document->params)
 245                 g_free (dvi_document->params);
 246
 247         g_free (dvi_document->uri);
 248
 249         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 250 }
 251
 252
 253 static void
 254 dvi_document_class_init (DviDocumentClass *klass)
 255 {
 256         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 257
 258         gobject_class->finalize = dvi_document_finalize;
 259 }
 260
 261 static gboolean
 262 dvi_document_can_get_text (EvDocument *document)
 263 {
 264         return FALSE;
 265 }
 266
 267 static EvDocumentInfo *
 268 dvi_document_get_info (EvDocument *document)
 269 {
 270         EvDocumentInfo *info;
 271
 272         info = g_new0 (EvDocumentInfo, 1);
 273
 274         return info;
 275 }
 276
 277 static void
 278 dvi_document_document_iface_init (EvDocumentIface *iface)
 279 {
 280         iface->load = dvi_document_load;
 281         iface->save = dvi_document_save;
 282         iface->can_get_text = dvi_document_can_get_text;
 283         iface->get_n_pages = dvi_document_get_n_pages;
 284         iface->get_page_size = dvi_document_get_page_size;
 285         iface->render_pixbuf = dvi_document_render_pixbuf;
 286         iface->get_info = dvi_document_get_info;
 287 }
 288
 289 static void
 290 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 291                                         gint                  page,
 292                                         gint                  suggested_width,
 293                                         gint                  *width,
 294                                         gint                  *height)
 295 {
 296         DviDocument *dvi_document = DVI_DOCUMENT (document);
 297         gdouble page_ratio;
 298
 299         page_ratio = dvi_document->base_height / dvi_document->base_width;
 300         *width = suggested_width;
 301         *height = (gint) (suggested_width * page_ratio);
 302
 303         return;
 304 }
 305
 306 static GdkPixbuf *
 307 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 308                                        gint                      page,
 309                                        gint                      rotation,
 310                                        gint                      width,
 311                                        gboolean                  border)
 312 {
 313         DviDocument *dvi_document = DVI_DOCUMENT (document);
 314         GdkPixbuf *pixbuf;
 315         GdkPixbuf *border_pixbuf;
 316         GdkPixbuf *rotated_pixbuf;
 317         gint thumb_width, thumb_height;
 318         gint proposed_width, proposed_height;
 319
 320         dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 321
 322         g_mutex_lock (dvi_context_mutex);
 323
 324         mdvi_setpage(dvi_document->context,  page);
 325
 326         mdvi_set_shrink (dvi_document->context,
 327                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 328                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 329
 330         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 331         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 332
 333         if (border) {
 334                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 335                                                  MAX (thumb_width - proposed_width, 0) / 2,
 336                                                  MAX (thumb_height - proposed_height, 0) / 2);
 337         } else {
 338                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 339                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 340                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 341         }
 342
 343
 344         mdvi_pixbuf_device_render (dvi_document->context);
 345         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 346
 347         g_mutex_unlock (dvi_context_mutex);
 348
 349         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rotation);
 350         g_object_unref (pixbuf);
 351
 352         if (border) {
 353               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 354               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 0, tmp_pixbuf);
 355               g_object_unref (tmp_pixbuf);
 356         }
 357
 358         return rotated_pixbuf;
 359 }
 360
 361 static void
 362 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 363 {
 364         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 365         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 366 }
 367
 368
 369 static void
 370 dvi_document_init_params (DviDocument *dvi_document)
 371 {
 372         dvi_document->params = g_new0 (DviParams, 1);
 373
 374         dvi_document->params->dpi      = MDVI_DPI;
 375         dvi_document->params->vdpi     = MDVI_VDPI;
 376         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 377         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 378         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 379         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 380         dvi_document->params->hdrift   = 0;
 381         dvi_document->params->vdrift   = 0;
 382         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 383         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 384         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 385
 386         dvi_document->spec = NULL;
 387
 388         dvi_document->params->bg = 0xffffffff;
 389         dvi_document->params->fg = 0xff000000;
 390
 391         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 392
 393         mdvi_register_fonts ();
 394 }
 395
 396 static void
 397 dvi_document_init (DviDocument *dvi_document)
 398 {
 399         dvi_document->context = NULL;
 400         dvi_document_init_params (dvi_document);
 401 }