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