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         if (width != NULL)
 146             *width = dvi_document->base_width;
 147
 148         if (height != NULL)
 149             *height = dvi_document->base_height;
 150
 151         return;
 152 }
 153
 154 static GdkPixbuf *
 155 dvi_document_render_pixbuf (EvDocument  *document, int page, double scale)
 156 {
 157         GdkPixbuf *pixbuf;
 158
 159         DviDocument *dvi_document = DVI_DOCUMENT(document);
 160
 161         gint required_width, required_height;
 162         gint proposed_width, proposed_height;
 163         gint xmargin = 0, ymargin = 0;
 164
 165         /* We should protect our context since it's not
 166          * thread safe. The work to the future -
 167          * let context render page independently
 168          */
 169         g_mutex_lock (dvi_context_mutex);
 170
 171         mdvi_setpage(dvi_document->context,  page);
 172
 173         mdvi_set_shrink (dvi_document->context,
 174                          (int)((dvi_document->params->hshrink - 1) / scale) + 1,
 175                          (int)((dvi_document->params->vshrink - 1) / scale) + 1);
 176
 177         required_width = dvi_document->base_width * scale;
 178         required_height = dvi_document->base_height * scale;
 179         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 180         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 181
 182         if (required_width >= proposed_width)
 183             xmargin = (required_width - proposed_width) / 2;
 184         if (required_height >= proposed_height)
 185             ymargin = (required_height - proposed_height) / 2;
 186
 187         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 188
 189         mdvi_pixbuf_device_render (dvi_document->context);
 190
 191         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 192
 193         g_mutex_unlock (dvi_context_mutex);
 194
 195         return pixbuf;
 196 }
 197
 198 static void
 199 dvi_document_finalize (GObject *object)
 200 {
 201         DviDocument *dvi_document = DVI_DOCUMENT(object);
 202
 203         if (dvi_document->context)
 204             {
 205                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 206                 mdvi_destroy_context (dvi_document->context);
 207             }
 208
 209         if (dvi_document->params)
 210                 g_free (dvi_document->params);
 211
 212         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 213 }
 214
 215
 216 static void
 217 dvi_document_class_init (DviDocumentClass *klass)
 218 {
 219         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 220
 221         gobject_class->finalize = dvi_document_finalize;
 222 }
 223
 224 static gboolean
 225 dvi_document_can_get_text (EvDocument *document)
 226 {
 227         return FALSE;
 228 }
 229
 230 static EvDocumentInfo *
 231 dvi_document_get_info (EvDocument *document)
 232 {
 233         EvDocumentInfo *info;
 234
 235         info = g_new0 (EvDocumentInfo, 1);
 236
 237         return info;
 238 }
 239
 240 static void
 241 dvi_document_document_iface_init (EvDocumentIface *iface)
 242 {
 243         iface->load = dvi_document_load;
 244         iface->save = dvi_document_save;
 245         iface->can_get_text = dvi_document_can_get_text;
 246         iface->get_n_pages = dvi_document_get_n_pages;
 247         iface->get_page_size = dvi_document_get_page_size;
 248         iface->render_pixbuf = dvi_document_render_pixbuf;
 249         iface->get_info = dvi_document_get_info;
 250 }
 251
 252 static void
 253 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 254                                            gint                  page,
 255                                            gint                  suggested_width,
 256                                            gint                  *width,
 257                                            gint                  *height)
 258 {
 259         DviDocument *dvi_document = DVI_DOCUMENT (document);
 260         gdouble page_ratio;
 261
 262         page_ratio = dvi_document->base_height / dvi_document->base_width;
 263         *width = suggested_width;
 264         *height = (gint) (suggested_width * page_ratio);
 265
 266         return;
 267 }
 268
 269 static GdkPixbuf *
 270 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 271                                        gint                      page,
 272                                        gint                      width,
 273                                        gboolean                  border)
 274 {
 275         DviDocument *dvi_document = DVI_DOCUMENT (document);
 276         GdkPixbuf *pixbuf;
 277         GdkPixbuf *border_pixbuf;
 278         gint thumb_width, thumb_height;
 279         gint proposed_width, proposed_height;
 280
 281         dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 282
 283         g_mutex_lock (dvi_context_mutex);
 284
 285         mdvi_setpage(dvi_document->context,  page);
 286
 287         mdvi_set_shrink (dvi_document->context,
 288                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 289                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 290
 291         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 292         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 293
 294         if (border) {
 295                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 296                                                  MAX (thumb_width - proposed_width, 0) / 2,
 297                                                  MAX (thumb_height - proposed_height, 0) / 2);
 298         } else {
 299                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 300                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 301                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 302         }
 303
 304
 305         mdvi_pixbuf_device_render (dvi_document->context);
 306         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 307
 308         g_mutex_unlock (dvi_context_mutex);
 309
 310         if (border) {
 311                 border_pixbuf = ev_document_misc_get_thumbnail_frame (thumb_width, thumb_height, NULL);
 312                 gdk_pixbuf_copy_area (pixbuf, 0, 0,
 313                                       thumb_width - 2, thumb_height - 2,
 314                                       border_pixbuf, 2, 2);
 315                 g_object_unref (pixbuf);
 316                 pixbuf = border_pixbuf;
 317         }
 318
 319
 320         return pixbuf;
 321 }
 322
 323 static void
 324 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 325 {
 326         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 327         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 328 }
 329
 330
 331 static void
 332 dvi_document_init_params (DviDocument *dvi_document)
 333 {
 334         dvi_document->params = g_new0 (DviParams, 1);
 335
 336         dvi_document->params->dpi      = MDVI_DPI;
 337         dvi_document->params->vdpi     = MDVI_VDPI;
 338         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 339         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 340         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 341         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 342         dvi_document->params->hdrift   = 0;
 343         dvi_document->params->vdrift   = 0;
 344         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 345         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 346         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 347
 348         dvi_document->spec = NULL;
 349
 350         dvi_document->params->bg = 0xffffffff;
 351         dvi_document->params->fg = 0xff000000;
 352
 353         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 354
 355         mdvi_register_fonts ();
 356 }
 357
 358 static void
 359 dvi_document_init (DviDocument *dvi_document)
 360 {
 361         dvi_document->context = NULL;
 362         dvi_document_init_params (dvi_document);
 363 }