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
  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
  55         double base_width;
  56         double base_height;
  57
  58         gchar *uri;
  59 };
  60
  61 typedef struct _DviDocumentClass DviDocumentClass;
  62
  63 static void dvi_document_document_iface_init (EvDocumentIface *iface);
  64 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  65 static void dvi_document_get_page_size                  (EvDocument   *document,
  66                                                          int       page,
  67                                                          double    *width,
  68                                                          double    *height);
  69
  70 G_DEFINE_TYPE_WITH_CODE
  71     (DviDocument, dvi_document, G_TYPE_OBJECT,
  72     {
  73       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, dvi_document_document_iface_init);
  74       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init)
  75      });
  76
  77 static gboolean
  78 dvi_document_load (EvDocument  *document,
  79                       const char  *uri,
  80                       GError     **error)
  81 {
  82     gchar *filename;
  83     DviDocument *dvi_document = DVI_DOCUMENT(document);
  84
  85     filename = g_filename_from_uri (uri, NULL, error);
  86
  87     if (!filename) {
  88                 g_set_error (error,
  89                              EV_DOCUMENT_ERROR,
  90                              EV_DOCUMENT_ERROR_INVALID,
  91                              _("File not available"));
  92                 return FALSE;
  93     }
  94
  95     g_mutex_lock (dvi_context_mutex);
  96     if (dvi_document->context)
  97         mdvi_destroy_context (dvi_document->context);
  98
  99     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
 100     g_mutex_unlock (dvi_context_mutex);
 101
 102     if (!dvi_document->context) {
 103                 g_set_error (error,
 104                              EV_DOCUMENT_ERROR,
 105                              EV_DOCUMENT_ERROR_INVALID,
 106                              _("DVI document has incorrect format"));
 107                 return FALSE;
 108     }
 109
 110     mdvi_pixbuf_device_init (&dvi_document->context->device);
 111
 112     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 113                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 114
 115     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 116                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 117
 118     g_free (dvi_document->uri);
 119     dvi_document->uri = g_strdup (uri);
 120
 121     return TRUE;
 122 }
 123
 124
 125 static gboolean
 126 dvi_document_save (EvDocument  *document,
 127                       const char  *uri,
 128                       GError     **error)
 129 {
 130         DviDocument *dvi_document = DVI_DOCUMENT (document);
 131
 132         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 133 }
 134
 135 static int
 136 dvi_document_get_n_pages (EvDocument  *document)
 137 {
 138     DviDocument *dvi_document = DVI_DOCUMENT (document);
 139     return dvi_document->context->npages;
 140 }
 141
 142 static void
 143 dvi_document_get_page_size (EvDocument   *document,
 144                             int       page,
 145                             double    *width,
 146                             double    *height)
 147 {
 148         DviDocument * dvi_document = DVI_DOCUMENT (document);
 149
 150         *width = dvi_document->base_width;
 151         *height = dvi_document->base_height;;
 152
 153         return;
 154 }
 155
 156 static GdkPixbuf *
 157 dvi_document_render_pixbuf (EvDocument  *document,
 158                             EvRenderContext *rc)
 159 {
 160         GdkPixbuf *pixbuf;
 161         GdkPixbuf *rotated_pixbuf;
 162
 163         DviDocument *dvi_document = DVI_DOCUMENT(document);
 164
 165         gint required_width, required_height;
 166         gint proposed_width, proposed_height;
 167         gint xmargin = 0, ymargin = 0;
 168
 169         /* We should protect our context since it's not
 170          * thread safe. The work to the future -
 171          * let context render page independently
 172          */
 173         g_mutex_lock (dvi_context_mutex);
 174
 175         mdvi_setpage(dvi_document->context,  rc->page);
 176
 177         mdvi_set_shrink (dvi_document->context,
 178                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 179                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 180
 181         required_width = dvi_document->base_width * rc->scale;
 182         required_height = dvi_document->base_height * rc->scale;
 183         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 184         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 185
 186         if (required_width >= proposed_width)
 187             xmargin = (required_width - proposed_width) / 2;
 188         if (required_height >= proposed_height)
 189             ymargin = (required_height - proposed_height) / 2;
 190
 191         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 192
 193         mdvi_pixbuf_device_render (dvi_document->context);
 194
 195         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 196
 197         g_mutex_unlock (dvi_context_mutex);
 198
 199         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 200         g_object_unref (pixbuf);
 201
 202         return rotated_pixbuf;
 203 }
 204
 205 static void
 206 dvi_document_finalize (GObject *object)
 207 {
 208         DviDocument *dvi_document = DVI_DOCUMENT(object);
 209
 210         g_mutex_lock (dvi_context_mutex);
 211         if (dvi_document->context)
 212             {
 213                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 214                 mdvi_destroy_context (dvi_document->context);
 215             }
 216         g_mutex_unlock (dvi_context_mutex);
 217
 218         if (dvi_document->params)
 219                 g_free (dvi_document->params);
 220
 221         g_free (dvi_document->uri);
 222
 223         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 224 }
 225
 226
 227 static void
 228 dvi_document_class_init (DviDocumentClass *klass)
 229 {
 230         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 231
 232         gobject_class->finalize = dvi_document_finalize;
 233
 234         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 235         mdvi_register_fonts ();
 236
 237         dvi_context_mutex = g_mutex_new ();
 238 }
 239
 240 static gboolean
 241 dvi_document_can_get_text (EvDocument *document)
 242 {
 243         return FALSE;
 244 }
 245
 246 static EvDocumentInfo *
 247 dvi_document_get_info (EvDocument *document)
 248 {
 249         EvDocumentInfo *info;
 250
 251         info = g_new0 (EvDocumentInfo, 1);
 252
 253         return info;
 254 }
 255
 256 static void
 257 dvi_document_document_iface_init (EvDocumentIface *iface)
 258 {
 259         iface->load = dvi_document_load;
 260         iface->save = dvi_document_save;
 261         iface->can_get_text = dvi_document_can_get_text;
 262         iface->get_n_pages = dvi_document_get_n_pages;
 263         iface->get_page_size = dvi_document_get_page_size;
 264         iface->render_pixbuf = dvi_document_render_pixbuf;
 265         iface->get_info = dvi_document_get_info;
 266 }
 267
 268 static void
 269 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 270                                         gint                  page,
 271                                         gint                  suggested_width,
 272                                         gint                  *width,
 273                                         gint                  *height)
 274 {
 275         DviDocument *dvi_document = DVI_DOCUMENT (document);
 276         gdouble page_ratio;
 277
 278         page_ratio = dvi_document->base_height / dvi_document->base_width;
 279         *width = suggested_width;
 280         *height = (gint) (suggested_width * page_ratio);
 281
 282         return;
 283 }
 284
 285 static GdkPixbuf *
 286 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 287                                        gint                      page,
 288                                        gint                      rotation,
 289                                        gint                      width,
 290                                        gboolean                  border)
 291 {
 292         DviDocument *dvi_document = DVI_DOCUMENT (document);
 293         GdkPixbuf *pixbuf;
 294         GdkPixbuf *border_pixbuf;
 295         GdkPixbuf *rotated_pixbuf;
 296         gint thumb_width, thumb_height;
 297         gint proposed_width, proposed_height;
 298
 299         dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 300
 301         g_mutex_lock (dvi_context_mutex);
 302
 303         mdvi_setpage(dvi_document->context,  page);
 304
 305         mdvi_set_shrink (dvi_document->context,
 306                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 307                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 308
 309         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 310         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 311
 312         if (border) {
 313                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 314                                                  MAX (thumb_width - proposed_width, 0) / 2,
 315                                                  MAX (thumb_height - proposed_height, 0) / 2);
 316         } else {
 317                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 318                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 319                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 320         }
 321
 322
 323         mdvi_pixbuf_device_render (dvi_document->context);
 324         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 325
 326         g_mutex_unlock (dvi_context_mutex);
 327
 328         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rotation);
 329         g_object_unref (pixbuf);
 330
 331         if (border) {
 332               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 333               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 0, tmp_pixbuf);
 334               g_object_unref (tmp_pixbuf);
 335         }
 336
 337         return rotated_pixbuf;
 338 }
 339
 340 static void
 341 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 342 {
 343         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 344         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 345 }
 346
 347
 348 static void
 349 dvi_document_init_params (DviDocument *dvi_document)
 350 {
 351         dvi_document->params = g_new0 (DviParams, 1);
 352
 353         dvi_document->params->dpi      = MDVI_DPI;
 354         dvi_document->params->vdpi     = MDVI_VDPI;
 355         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 356         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 357         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 358         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 359         dvi_document->params->hdrift   = 0;
 360         dvi_document->params->vdrift   = 0;
 361         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 362         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 363         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 364
 365         dvi_document->spec = NULL;
 366
 367         dvi_document->params->bg = 0xffffffff;
 368         dvi_document->params->fg = 0xff000000;
 369 }
 370
 371 static void
 372 dvi_document_init (DviDocument *dvi_document)
 373 {
 374         dvi_document->context = NULL;
 375         dvi_document_init_params (dvi_document);
 376 }