backend/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 "dvi-document.h"
  21 #include "ev-document-thumbnails.h"
  22 #include "ev-document-misc.h"
  23
  24 #include "mdvi.h"
  25 #include "fonts.h"
  26 #include "pixbuf-device.h"
  27
  28 #include <gtk/gtk.h>
  29 #include <glib/gi18n.h>
  30
  31 GMutex *dvi_context_mutex = NULL;
  32
  33 enum {
  34         PROP_0,
  35         PROP_TITLE
  36 };
  37
  38 struct _DviDocumentClass
  39 {
  40         GObjectClass parent_class;
  41 };
  42
  43 struct _DviDocument
  44 {
  45         GObject parent_instance;
  46
  47         DviContext *context;
  48         DviPageSpec *spec;
  49         DviParams *params;
  50
  51         /* To let document scale we should remember width and height */
  52
  53         double base_width;
  54         double base_height;
  55
  56         gchar *uri;
  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     g_mutex_lock (dvi_context_mutex);
  94     if (dvi_document->context)
  95         mdvi_destroy_context (dvi_document->context);
  96
  97     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
  98     g_mutex_unlock (dvi_context_mutex);
  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     g_free (dvi_document->uri);
 117     dvi_document->uri = g_strdup (uri);
 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         DviDocument *dvi_document = DVI_DOCUMENT (document);
 129
 130         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 131 }
 132
 133 static int
 134 dvi_document_get_n_pages (EvDocument  *document)
 135 {
 136     DviDocument *dvi_document = DVI_DOCUMENT (document);
 137     return dvi_document->context->npages;
 138 }
 139
 140 static void
 141 dvi_document_get_page_size (EvDocument   *document,
 142                             int       page,
 143                             double    *width,
 144                             double    *height)
 145 {
 146         DviDocument * dvi_document = DVI_DOCUMENT (document);
 147
 148         *width = dvi_document->base_width;
 149         *height = dvi_document->base_height;;
 150
 151         return;
 152 }
 153
 154 static GdkPixbuf *
 155 dvi_document_render_pixbuf (EvDocument  *document,
 156                             EvRenderContext *rc)
 157 {
 158         GdkPixbuf *pixbuf;
 159         GdkPixbuf *rotated_pixbuf;
 160
 161         DviDocument *dvi_document = DVI_DOCUMENT(document);
 162
 163         gint required_width, required_height;
 164         gint proposed_width, proposed_height;
 165         gint xmargin = 0, ymargin = 0;
 166
 167         /* We should protect our context since it's not
 168          * thread safe. The work to the future -
 169          * let context render page independently
 170          */
 171         g_mutex_lock (dvi_context_mutex);
 172
 173         mdvi_setpage(dvi_document->context,  rc->page);
 174
 175         mdvi_set_shrink (dvi_document->context,
 176                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 177                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 178
 179         required_width = dvi_document->base_width * rc->scale;
 180         required_height = dvi_document->base_height * rc->scale;
 181         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 182         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 183
 184         if (required_width >= proposed_width)
 185             xmargin = (required_width - proposed_width) / 2;
 186         if (required_height >= proposed_height)
 187             ymargin = (required_height - proposed_height) / 2;
 188
 189         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 190
 191         mdvi_pixbuf_device_render (dvi_document->context);
 192
 193         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 194
 195         g_mutex_unlock (dvi_context_mutex);
 196
 197         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 198         g_object_unref (pixbuf);
 199
 200         return rotated_pixbuf;
 201 }
 202
 203 static void
 204 dvi_document_finalize (GObject *object)
 205 {
 206         DviDocument *dvi_document = DVI_DOCUMENT(object);
 207
 208         g_mutex_lock (dvi_context_mutex);
 209         if (dvi_document->context)
 210             {
 211                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 212                 mdvi_destroy_context (dvi_document->context);
 213             }
 214         g_mutex_unlock (dvi_context_mutex);
 215
 216         if (dvi_document->params)
 217                 g_free (dvi_document->params);
 218
 219         g_free (dvi_document->uri);
 220
 221         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 222 }
 223
 224
 225 static void
 226 dvi_document_class_init (DviDocumentClass *klass)
 227 {
 228         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 229
 230         gobject_class->finalize = dvi_document_finalize;
 231
 232         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 233         mdvi_register_fonts ();
 234
 235         dvi_context_mutex = g_mutex_new ();
 236 }
 237
 238 static gboolean
 239 dvi_document_can_get_text (EvDocument *document)
 240 {
 241         return FALSE;
 242 }
 243
 244 static EvDocumentInfo *
 245 dvi_document_get_info (EvDocument *document)
 246 {
 247         EvDocumentInfo *info;
 248
 249         info = g_new0 (EvDocumentInfo, 1);
 250
 251         return info;
 252 }
 253
 254 static void
 255 dvi_document_document_iface_init (EvDocumentIface *iface)
 256 {
 257         iface->load = dvi_document_load;
 258         iface->save = dvi_document_save;
 259         iface->can_get_text = dvi_document_can_get_text;
 260         iface->get_n_pages = dvi_document_get_n_pages;
 261         iface->get_page_size = dvi_document_get_page_size;
 262         iface->render_pixbuf = dvi_document_render_pixbuf;
 263         iface->get_info = dvi_document_get_info;
 264 }
 265
 266 static void
 267 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 268                                         EvRenderContext      *rc,
 269                                         gint                  *width,
 270                                         gint                  *height)
 271 {
 272         DviDocument *dvi_document = DVI_DOCUMENT (document);
 273         gdouble page_width = dvi_document->base_width;
 274         gdouble page_height = dvi_document->base_height;
 275
 276         if (rc->rotation == 90 || rc->rotation == 270) {
 277                 *width = (gint) (page_height * rc->scale);
 278                 *height = (gint) (page_width * rc->scale);
 279         } else {
 280                 *width = (gint) (page_width * rc->scale);
 281                 *height = (gint) (page_height * rc->scale);
 282         }
 283 }
 284
 285 static GdkPixbuf *
 286 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 287                                        EvRenderContext      *rc,
 288                                        gboolean              border)
 289 {
 290         DviDocument *dvi_document = DVI_DOCUMENT (document);
 291         GdkPixbuf *pixbuf;
 292         GdkPixbuf *border_pixbuf;
 293         GdkPixbuf *rotated_pixbuf;
 294         gint thumb_width, thumb_height;
 295         gint proposed_width, proposed_height;
 296
 297         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 298         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 299
 300         g_mutex_lock (dvi_context_mutex);
 301
 302         mdvi_setpage (dvi_document->context, rc->page);
 303
 304         mdvi_set_shrink (dvi_document->context,
 305                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 306                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 307
 308         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 309         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 310
 311         if (border) {
 312                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 313                                                  MAX (thumb_width - proposed_width, 0) / 2,
 314                                                  MAX (thumb_height - proposed_height, 0) / 2);
 315         } else {
 316                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 317                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 318                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 319         }
 320
 321
 322         mdvi_pixbuf_device_render (dvi_document->context);
 323         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 324
 325         g_mutex_unlock (dvi_context_mutex);
 326
 327         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 328         g_object_unref (pixbuf);
 329
 330         if (border) {
 331               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 332
 333               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 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 }