djvu/djvu-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 "djvu-document.h"
  21 #include "ev-document-thumbnails.h"
  22 #include "ev-document-misc.h"
  23
  24 #include <libdjvu/ddjvuapi.h>
  25 #include <gtk/gtk.h>
  26 #include <gdk-pixbuf/gdk-pixbuf-core.h>
  27
  28 #include <libgnomevfs/gnome-vfs-uri.h>
  29 #include <libgnomevfs/gnome-vfs-utils.h>
  30 #include <libgnomevfs/gnome-vfs-ops.h>
  31 #include <libgnomevfs/gnome-vfs-xfer.h>
  32
  33 #define SCALE_FACTOR 0.2
  34
  35 enum {
  36         PROP_0,
  37         PROP_TITLE
  38 };
  39
  40 struct _DjvuDocumentClass
  41 {
  42         GObjectClass parent_class;
  43 };
  44
  45 struct _DjvuDocument
  46 {
  47         GObject parent_instance;
  48
  49         ddjvu_context_t  *d_context;
  50         ddjvu_document_t *d_document;
  51         ddjvu_format_t   *d_format;
  52
  53         gchar *uri;
  54 };
  55
  56 typedef struct _DjvuDocumentClass DjvuDocumentClass;
  57
  58 static void djvu_document_document_iface_init (EvDocumentIface *iface);
  59 static void djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  60
  61 G_DEFINE_TYPE_WITH_CODE
  62     (DjvuDocument, djvu_document, G_TYPE_OBJECT,
  63     {
  64       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, djvu_document_document_iface_init);
  65       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, djvu_document_document_thumbnails_iface_init)
  66      });
  67
  68 static gboolean
  69 djvu_document_load (EvDocument  *document,
  70                       const char  *uri,
  71                       GError     **error)
  72 {
  73         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
  74         ddjvu_document_t *doc;
  75         gchar *filename;
  76
  77         /* FIXME: We could actually load uris  */
  78         filename = g_filename_from_uri (uri, NULL, error);
  79         if (!filename)
  80                 return FALSE;
  81
  82         doc = ddjvu_document_create_by_filename (djvu_document->d_context, filename, TRUE);
  83
  84         if (!doc) return FALSE;
  85
  86         if (djvu_document->d_document)
  87             ddjvu_document_release (djvu_document->d_document);
  88
  89         djvu_document->d_document = doc;
  90
  91         while (!ddjvu_document_decoding_done (djvu_document->d_document)) {
  92                     ddjvu_message_wait (djvu_document->d_context);
  93                     ddjvu_message_pop (djvu_document->d_context);
  94         }
  95         g_free (djvu_document->uri);
  96         djvu_document->uri = g_strdup (uri);
  97
  98         return TRUE;
  99 }
 100
 101
 102 static gboolean
 103 djvu_document_save (EvDocument  *document,
 104                       const char  *uri,
 105                       GError     **error)
 106 {
 107         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 108         GnomeVFSResult result;
 109         GnomeVFSURI *source_uri;
 110         GnomeVFSURI *target_uri;
 111
 112         if (!djvu_document->uri)
 113                 return FALSE;
 114
 115         source_uri = gnome_vfs_uri_new (djvu_document->uri);
 116         target_uri = gnome_vfs_uri_new (uri);
 117
 118         result = gnome_vfs_xfer_uri (source_uri, target_uri,
 119                                      GNOME_VFS_XFER_DEFAULT | GNOME_VFS_XFER_FOLLOW_LINKS,
 120                                      GNOME_VFS_XFER_ERROR_MODE_ABORT,
 121                                      GNOME_VFS_XFER_OVERWRITE_MODE_REPLACE,
 122                                      NULL,
 123                                      NULL);
 124         gnome_vfs_uri_unref (target_uri);
 125         gnome_vfs_uri_unref (source_uri);
 126
 127         if (result != GNOME_VFS_OK)
 128                 g_set_error (error,
 129                              EV_DOCUMENT_ERROR,
 130                              0,
 131                              gnome_vfs_result_to_string (result));
 132         return (result == GNOME_VFS_OK);
 133 }
 134
 135 static int
 136 djvu_document_get_n_pages (EvDocument  *document)
 137 {
 138         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 139
 140         g_return_val_if_fail (djvu_document->d_document, 0);
 141
 142         return ddjvu_document_get_pagenum (djvu_document->d_document);
 143 }
 144
 145 static void
 146 djvu_document_get_page_size (EvDocument   *document,
 147                                int           page,
 148                                double       *width,
 149                                double       *height)
 150 {
 151         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 152         ddjvu_pageinfo_t info;
 153
 154         g_return_if_fail (djvu_document->d_document);
 155
 156         while (ddjvu_document_get_pageinfo(djvu_document->d_document, page, &info) < DDJVU_JOB_OK) {
 157                     ddjvu_message_wait (djvu_document->d_context);
 158                     ddjvu_message_pop (djvu_document->d_context);
 159         }
 160
 161         *width = info.width * SCALE_FACTOR;
 162         *height = info.height * SCALE_FACTOR;
 163 }
 164
 165 static GdkPixbuf *
 166 djvu_document_render_pixbuf (EvDocument  *document,
 167                              EvRenderContext *rc)
 168 {
 169         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 170         GdkPixbuf *pixbuf;
 171         GdkPixbuf *rotated_pixbuf;
 172
 173         ddjvu_rect_t rrect;
 174         ddjvu_rect_t prect;
 175         ddjvu_page_t *d_page;
 176
 177         double page_width, page_height;
 178
 179         d_page = ddjvu_page_create_by_pageno (djvu_document->d_document, rc->page);
 180
 181         while (!ddjvu_page_decoding_done (d_page)) {
 182                     ddjvu_message_wait (djvu_document->d_context);
 183                     ddjvu_message_pop (djvu_document->d_context);
 184         }
 185
 186         page_width = ddjvu_page_get_width (d_page) * rc->scale * SCALE_FACTOR;
 187         page_height = ddjvu_page_get_height (d_page) * rc->scale * SCALE_FACTOR;
 188
 189         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, page_width, page_height);
 190
 191         prect.x = 0; prect.y = 0;
 192         prect.w = page_width; prect.h = page_height;
 193         rrect = prect;
 194
 195         ddjvu_page_render(d_page, DDJVU_RENDER_COLOR,
 196                           &prect,
 197                           &rrect,
 198                           djvu_document->d_format,
 199                           gdk_pixbuf_get_rowstride (pixbuf),
 200                           (gchar *)gdk_pixbuf_get_pixels (pixbuf));
 201
 202         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 203         g_object_unref (pixbuf);
 204
 205         return rotated_pixbuf;
 206 }
 207
 208 static void
 209 djvu_document_finalize (GObject *object)
 210 {
 211         DjvuDocument *djvu_document = DJVU_DOCUMENT (object);
 212
 213         if (djvu_document->d_document)
 214             ddjvu_document_release (djvu_document->d_document);
 215
 216         ddjvu_context_release (djvu_document->d_context);
 217         ddjvu_format_release (djvu_document->d_format);
 218         g_free (djvu_document->uri);
 219
 220         G_OBJECT_CLASS (djvu_document_parent_class)->finalize (object);
 221 }
 222
 223 static void
 224 djvu_document_class_init (DjvuDocumentClass *klass)
 225 {
 226         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 227
 228         gobject_class->finalize = djvu_document_finalize;
 229 }
 230
 231 static gboolean
 232 djvu_document_can_get_text (EvDocument *document)
 233 {
 234         return FALSE;
 235 }
 236
 237 static EvDocumentInfo *
 238 djvu_document_get_info (EvDocument *document)
 239 {
 240         EvDocumentInfo *info;
 241
 242         info = g_new0 (EvDocumentInfo, 1);
 243
 244         return info;
 245 }
 246
 247 static void
 248 djvu_document_document_iface_init (EvDocumentIface *iface)
 249 {
 250         iface->load = djvu_document_load;
 251         iface->save = djvu_document_save;
 252         iface->can_get_text = djvu_document_can_get_text;
 253         iface->get_n_pages = djvu_document_get_n_pages;
 254         iface->get_page_size = djvu_document_get_page_size;
 255         iface->render_pixbuf = djvu_document_render_pixbuf;
 256         iface->get_info = djvu_document_get_info;
 257 }
 258
 259 static void
 260 djvu_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 261                                            gint                  page,
 262                                            gint                  suggested_width,
 263                                            gint                  *width,
 264                                            gint                  *height)
 265 {
 266         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 267         gdouble p_width, p_height;
 268         gdouble page_ratio;
 269
 270         djvu_document_get_page_size (EV_DOCUMENT(djvu_document), page, &p_width, &p_height);
 271
 272         page_ratio = p_height / p_width;
 273         *width = suggested_width;
 274         *height = (gint) (suggested_width * page_ratio);
 275
 276         return;
 277 }
 278
 279 static GdkPixbuf *
 280 djvu_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 281                                           gint                   page,
 282                                           gint                   rotation,
 283                                           gint                   width,
 284                                           gboolean               border)
 285 {
 286         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 287         GdkPixbuf *pixbuf, *rotated_pixbuf;
 288         gint thumb_width, thumb_height;
 289
 290         guchar *pixels;
 291
 292         g_return_val_if_fail (djvu_document->d_document, NULL);
 293
 294         djvu_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 295
 296         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 297                                  thumb_width, thumb_height);
 298         gdk_pixbuf_fill (pixbuf, 0xffffffff);
 299         pixels = gdk_pixbuf_get_pixels (pixbuf);
 300
 301         while (ddjvu_thumbnail_status (djvu_document->d_document, page, 1) < DDJVU_JOB_OK) {
 302                     ddjvu_message_wait (djvu_document->d_context);
 303                     ddjvu_message_pop (djvu_document->d_context);
 304         }
 305
 306         ddjvu_thumbnail_render (djvu_document->d_document, page,
 307                                 &thumb_width, &thumb_height,
 308                                 djvu_document->d_format,
 309                                 gdk_pixbuf_get_rowstride (pixbuf),
 310                                 (gchar *)pixels);
 311
 312         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rotation);
 313         g_object_unref (pixbuf);
 314
 315         if (border) {
 316               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 317               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 0, tmp_pixbuf);
 318               g_object_unref (tmp_pixbuf);
 319         }
 320
 321         return rotated_pixbuf;
 322 }
 323
 324 static void
 325 djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 326 {
 327         iface->get_thumbnail = djvu_document_thumbnails_get_thumbnail;
 328         iface->get_dimensions = djvu_document_thumbnails_get_dimensions;
 329 }
 330
 331 static void
 332 djvu_document_init (DjvuDocument *djvu_document)
 333 {
 334         djvu_document->d_context = ddjvu_context_create ("Evince");
 335         djvu_document->d_format = ddjvu_format_create (DDJVU_FORMAT_RGB24, 0, 0);
 336         ddjvu_format_set_row_order (djvu_document->d_format,1);
 337
 338         djvu_document->d_document = NULL;
 339 }
 340