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         EvOrientation orientation;
  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     if (dvi_document->context)
  96         mdvi_destroy_context (dvi_document->context);
  97
  98     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
  99
 100     if (!dvi_document->context) {
 101                 g_set_error (error,
 102                              EV_DOCUMENT_ERROR,
 103                              EV_DOCUMENT_ERROR_INVALID,
 104                              _("DVI document has incorrect format"));
 105                 return FALSE;
 106     }
 107
 108     mdvi_pixbuf_device_init (&dvi_document->context->device);
 109
 110     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 111                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 112
 113     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 114                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 115
 116     dvi_context_mutex = g_mutex_new ();
 117
 118
 119     return TRUE;
 120 }
 121
 122
 123 static gboolean
 124 dvi_document_save (EvDocument  *document,
 125                       const char  *uri,
 126                       GError     **error)
 127 {
 128         g_warning ("dvi_document_save not implemented"); /* FIXME */
 129         return TRUE;
 130 }
 131
 132 static int
 133 dvi_document_get_n_pages (EvDocument  *document)
 134 {
 135     DviDocument *dvi_document = DVI_DOCUMENT (document);
 136     return dvi_document->context->npages;
 137 }
 138
 139 static EvOrientation
 140 dvi_document_get_orientation (EvDocument *document)
 141 {
 142         DviDocument *dvi_document = DVI_DOCUMENT (document);
 143
 144         return dvi_document->orientation;
 145 }
 146
 147 static void
 148 dvi_document_set_orientation (EvDocument *document,
 149                               EvOrientation   orientation)
 150 {
 151         DviDocument *dvi_document = DVI_DOCUMENT (document);
 152
 153         dvi_document->orientation = orientation;
 154 }
 155
 156
 157 static void
 158 dvi_document_get_page_size (EvDocument   *document,
 159                             int       page,
 160                             double    *width,
 161                             double    *height)
 162 {
 163         DviDocument * dvi_document = DVI_DOCUMENT (document);
 164
 165         if (dvi_document->orientation == EV_ORIENTATION_PORTRAIT ||
 166             dvi_document->orientation ==  EV_ORIENTATION_UPSIDEDOWN) {
 167                 *width = dvi_document->base_width;
 168                 *height = dvi_document->base_height;;
 169         } else {
 170                 *width = dvi_document->base_height;
 171                 *height = dvi_document->base_width;
 172         }
 173
 174         return;
 175 }
 176
 177 static GdkPixbuf *
 178 rotate_pixbuf (EvDocument *document, GdkPixbuf *pixbuf)
 179 {
 180         DviDocument *dvi_document = DVI_DOCUMENT (document);
 181
 182         switch (dvi_document->orientation)
 183         {
 184                 case EV_ORIENTATION_LANDSCAPE:
 185                         return gdk_pixbuf_rotate_simple (pixbuf, 90);
 186                 case EV_ORIENTATION_UPSIDEDOWN:
 187                         return gdk_pixbuf_rotate_simple (pixbuf, 180);
 188                 case EV_ORIENTATION_SEASCAPE:
 189                         return gdk_pixbuf_rotate_simple (pixbuf, 270);
 190                 default:
 191                         return g_object_ref (pixbuf);
 192         }
 193 }
 194
 195 static GdkPixbuf *
 196 dvi_document_render_pixbuf (EvDocument  *document,
 197                             EvRenderContext *rc)
 198 {
 199         GdkPixbuf *pixbuf;
 200         GdkPixbuf *rotated_pixbuf;
 201
 202         DviDocument *dvi_document = DVI_DOCUMENT(document);
 203
 204         gint required_width, required_height;
 205         gint proposed_width, proposed_height;
 206         gint xmargin = 0, ymargin = 0;
 207
 208         /* We should protect our context since it's not
 209          * thread safe. The work to the future -
 210          * let context render page independently
 211          */
 212         g_mutex_lock (dvi_context_mutex);
 213
 214         mdvi_setpage(dvi_document->context,  rc->page);
 215
 216         mdvi_set_shrink (dvi_document->context,
 217                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 218                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 219
 220         required_width = dvi_document->base_width * rc->scale;
 221         required_height = dvi_document->base_height * rc->scale;
 222         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 223         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 224
 225         if (required_width >= proposed_width)
 226             xmargin = (required_width - proposed_width) / 2;
 227         if (required_height >= proposed_height)
 228             ymargin = (required_height - proposed_height) / 2;
 229
 230         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 231
 232         mdvi_pixbuf_device_render (dvi_document->context);
 233
 234         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 235
 236         g_mutex_unlock (dvi_context_mutex);
 237
 238         rotated_pixbuf = rotate_pixbuf (document, pixbuf);
 239         g_object_unref (pixbuf);
 240
 241         return rotated_pixbuf;
 242 }
 243
 244 static void
 245 dvi_document_finalize (GObject *object)
 246 {
 247         DviDocument *dvi_document = DVI_DOCUMENT(object);
 248
 249         if (dvi_document->context)
 250             {
 251                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 252                 mdvi_destroy_context (dvi_document->context);
 253             }
 254
 255         if (dvi_document->params)
 256                 g_free (dvi_document->params);
 257
 258         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 259 }
 260
 261
 262 static void
 263 dvi_document_class_init (DviDocumentClass *klass)
 264 {
 265         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 266
 267         gobject_class->finalize = dvi_document_finalize;
 268 }
 269
 270 static gboolean
 271 dvi_document_can_get_text (EvDocument *document)
 272 {
 273         return FALSE;
 274 }
 275
 276 static EvDocumentInfo *
 277 dvi_document_get_info (EvDocument *document)
 278 {
 279         EvDocumentInfo *info;
 280
 281         info = g_new0 (EvDocumentInfo, 1);
 282
 283         return info;
 284 }
 285
 286 static void
 287 dvi_document_document_iface_init (EvDocumentIface *iface)
 288 {
 289         iface->load = dvi_document_load;
 290         iface->save = dvi_document_save;
 291         iface->can_get_text = dvi_document_can_get_text;
 292         iface->get_n_pages = dvi_document_get_n_pages;
 293         iface->get_page_size = dvi_document_get_page_size;
 294         iface->render_pixbuf = dvi_document_render_pixbuf;
 295         iface->get_info = dvi_document_get_info;
 296         iface->get_orientation = dvi_document_get_orientation;
 297         iface->set_orientation = dvi_document_set_orientation;
 298 }
 299
 300 static void
 301 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 302                                            gint                  page,
 303                                            gint                  suggested_width,
 304                                            gint                  *width,
 305                                            gint                  *height)
 306 {
 307         DviDocument *dvi_document = DVI_DOCUMENT (document);
 308         gdouble page_ratio;
 309
 310         page_ratio = dvi_document->base_height / dvi_document->base_width;
 311         *width = suggested_width;
 312         *height = (gint) (suggested_width * page_ratio);
 313
 314         return;
 315 }
 316
 317 static GdkPixbuf *
 318 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 319                                        gint                      page,
 320                                        gint                      width,
 321                                        gboolean                  border)
 322 {
 323         DviDocument *dvi_document = DVI_DOCUMENT (document);
 324         GdkPixbuf *pixbuf;
 325         GdkPixbuf *border_pixbuf;
 326         gint thumb_width, thumb_height;
 327         gint proposed_width, proposed_height;
 328
 329         dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 330
 331         g_mutex_lock (dvi_context_mutex);
 332
 333         mdvi_setpage(dvi_document->context,  page);
 334
 335         mdvi_set_shrink (dvi_document->context,
 336                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 337                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 338
 339         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 340         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 341
 342         if (border) {
 343                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 344                                                  MAX (thumb_width - proposed_width, 0) / 2,
 345                                                  MAX (thumb_height - proposed_height, 0) / 2);
 346         } else {
 347                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 348                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 349                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 350         }
 351
 352
 353         mdvi_pixbuf_device_render (dvi_document->context);
 354         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 355
 356         g_mutex_unlock (dvi_context_mutex);
 357
 358         if (border) {
 359                 border_pixbuf = ev_document_misc_get_thumbnail_frame (thumb_width, thumb_height, NULL);
 360                 gdk_pixbuf_copy_area (pixbuf, 0, 0,
 361                                       thumb_width - 2, thumb_height - 2,
 362                                       border_pixbuf, 2, 2);
 363                 g_object_unref (pixbuf);
 364                 pixbuf = border_pixbuf;
 365         }
 366
 367
 368         return pixbuf;
 369 }
 370
 371 static void
 372 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 373 {
 374         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 375         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 376 }
 377
 378
 379 static void
 380 dvi_document_init_params (DviDocument *dvi_document)
 381 {
 382         dvi_document->params = g_new0 (DviParams, 1);
 383
 384         dvi_document->params->dpi      = MDVI_DPI;
 385         dvi_document->params->vdpi     = MDVI_VDPI;
 386         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 387         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 388         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 389         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 390         dvi_document->params->hdrift   = 0;
 391         dvi_document->params->vdrift   = 0;
 392         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 393         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 394         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 395
 396         dvi_document->spec = NULL;
 397
 398         dvi_document->params->bg = 0xffffffff;
 399         dvi_document->params->fg = 0xff000000;
 400
 401         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 402
 403         mdvi_register_fonts ();
 404 }
 405
 406 static void
 407 dvi_document_init (DviDocument *dvi_document)
 408 {
 409         dvi_document->context = NULL;
 410         dvi_document_init_params (dvi_document);
 411 }