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 #define SCALE_FACTOR 0.2
  29
  30 enum {
  31         PROP_0,
  32         PROP_TITLE
  33 };
  34
  35 struct _DjvuDocumentClass
  36 {
  37         GObjectClass parent_class;
  38 };
  39
  40 struct _DjvuDocument
  41 {
  42         GObject parent_instance;
  43
  44         ddjvu_context_t  *d_context;
  45         ddjvu_document_t *d_document;
  46         ddjvu_format_t   *d_format;
  47 };
  48
  49 typedef struct _DjvuDocumentClass DjvuDocumentClass;
  50
  51 static void djvu_document_document_iface_init (EvDocumentIface *iface);
  52 static void djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  53
  54 G_DEFINE_TYPE_WITH_CODE
  55     (DjvuDocument, djvu_document, G_TYPE_OBJECT,
  56     {
  57       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, djvu_document_document_iface_init);
  58       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, djvu_document_document_thumbnails_iface_init)
  59      });
  60
  61 static gboolean
  62 djvu_document_load (EvDocument  *document,
  63                       const char  *uri,
  64                       GError     **error)
  65 {
  66         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
  67         ddjvu_document_t *doc;
  68         gchar *filename;
  69
  70         /* FIXME: We could actually load uris  */
  71         filename = g_filename_from_uri (uri, NULL, error);
  72         if (!filename)
  73                 return FALSE;
  74
  75         doc = ddjvu_document_create_by_filename (djvu_document->d_context, filename, TRUE);
  76
  77         if (!doc) return FALSE;
  78
  79         if (djvu_document->d_document)
  80             ddjvu_document_release (djvu_document->d_document);
  81
  82         djvu_document->d_document = doc;
  83
  84         while (!ddjvu_document_decoding_done (djvu_document->d_document)) {
  85                     ddjvu_message_wait (djvu_document->d_context);
  86                     ddjvu_message_pop (djvu_document->d_context);
  87         }
  88
  89         return TRUE;
  90 }
  91
  92
  93 static gboolean
  94 djvu_document_save (EvDocument  *document,
  95                       const char  *uri,
  96                       GError     **error)
  97 {
  98         g_warning ("djvu_document_save not implemented"); /* FIXME */
  99         return TRUE;
 100 }
 101
 102 static int
 103 djvu_document_get_n_pages (EvDocument  *document)
 104 {
 105         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 106
 107         g_return_val_if_fail (djvu_document->d_document, 0);
 108
 109         return ddjvu_document_get_pagenum (djvu_document->d_document);
 110 }
 111
 112 static void
 113 djvu_document_get_page_size (EvDocument   *document,
 114                                int           page,
 115                                double       *width,
 116                                double       *height)
 117 {
 118         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 119         ddjvu_pageinfo_t info;
 120
 121         g_return_if_fail (djvu_document->d_document);
 122
 123         while (ddjvu_document_get_pageinfo(djvu_document->d_document, page, &info) < DDJVU_JOB_OK) {
 124                     ddjvu_message_wait (djvu_document->d_context);
 125                     ddjvu_message_pop (djvu_document->d_context);
 126         }
 127
 128         *width = info.width * SCALE_FACTOR;
 129         *height = info.height * SCALE_FACTOR;
 130 }
 131
 132 static GdkPixbuf *
 133 djvu_document_render_pixbuf (EvDocument  *document,
 134                              EvRenderContext *rc)
 135 {
 136         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 137         GdkPixbuf *pixbuf;
 138         GdkPixbuf *rotated_pixbuf;
 139
 140         ddjvu_rect_t rrect;
 141         ddjvu_rect_t prect;
 142         ddjvu_page_t *d_page;
 143
 144         double page_width, page_height;
 145
 146         d_page = ddjvu_page_create_by_pageno (djvu_document->d_document, rc->page);
 147
 148         while (!ddjvu_page_decoding_done (d_page)) {
 149                     ddjvu_message_wait (djvu_document->d_context);
 150                     ddjvu_message_pop (djvu_document->d_context);
 151         }
 152
 153         page_width = ddjvu_page_get_width (d_page) * rc->scale * SCALE_FACTOR;
 154         page_height = ddjvu_page_get_height (d_page) * rc->scale * SCALE_FACTOR;
 155
 156         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, page_width, page_height);
 157
 158         prect.x = 0; prect.y = 0;
 159         prect.w = page_width; prect.h = page_height;
 160         rrect = prect;
 161
 162         ddjvu_page_render(d_page, DDJVU_RENDER_COLOR,
 163                           &prect,
 164                           &rrect,
 165                           djvu_document->d_format,
 166                           gdk_pixbuf_get_rowstride (pixbuf),
 167                           (gchar *)gdk_pixbuf_get_pixels (pixbuf));
 168
 169         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, rc->rotation);
 170         g_object_unref (pixbuf);
 171
 172         return rotated_pixbuf;
 173 }
 174
 175 static void
 176 djvu_document_finalize (GObject *object)
 177 {
 178         DjvuDocument *djvu_document = DJVU_DOCUMENT (object);
 179
 180         if (djvu_document->d_document)
 181             ddjvu_document_release (djvu_document->d_document);
 182
 183         ddjvu_context_release (djvu_document->d_context);
 184         ddjvu_format_release (djvu_document->d_format);
 185
 186         G_OBJECT_CLASS (djvu_document_parent_class)->finalize (object);
 187 }
 188
 189 static void
 190 djvu_document_class_init (DjvuDocumentClass *klass)
 191 {
 192         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 193
 194         gobject_class->finalize = djvu_document_finalize;
 195 }
 196
 197 static gboolean
 198 djvu_document_can_get_text (EvDocument *document)
 199 {
 200         return FALSE;
 201 }
 202
 203 static EvDocumentInfo *
 204 djvu_document_get_info (EvDocument *document)
 205 {
 206         EvDocumentInfo *info;
 207
 208         info = g_new0 (EvDocumentInfo, 1);
 209
 210         return info;
 211 }
 212
 213 static void
 214 djvu_document_document_iface_init (EvDocumentIface *iface)
 215 {
 216         iface->load = djvu_document_load;
 217         iface->save = djvu_document_save;
 218         iface->can_get_text = djvu_document_can_get_text;
 219         iface->get_n_pages = djvu_document_get_n_pages;
 220         iface->get_page_size = djvu_document_get_page_size;
 221         iface->render_pixbuf = djvu_document_render_pixbuf;
 222         iface->get_info = djvu_document_get_info;
 223 }
 224
 225 static void
 226 djvu_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 227                                            gint                  page,
 228                                            gint                  suggested_width,
 229                                            gint                  *width,
 230                                            gint                  *height)
 231 {
 232         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 233         gdouble p_width, p_height;
 234         gdouble page_ratio;
 235
 236         djvu_document_get_page_size (EV_DOCUMENT(djvu_document), page, &p_width, &p_height);
 237
 238         page_ratio = p_height / p_width;
 239         *width = suggested_width;
 240         *height = (gint) (suggested_width * page_ratio);
 241
 242         return;
 243 }
 244
 245 static GdkPixbuf *
 246 djvu_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 247                                           gint                   page,
 248                                           gint                   rotation,
 249                                           gint                   width,
 250                                           gboolean               border)
 251 {
 252         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 253         GdkPixbuf *pixbuf, *rotated_pixbuf;
 254         gint thumb_width, thumb_height;
 255
 256         guchar *pixels;
 257
 258         g_return_val_if_fail (djvu_document->d_document, NULL);
 259
 260         djvu_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 261
 262         if (border) {
 263                 pixbuf = ev_document_misc_get_thumbnail_frame (thumb_width, thumb_height, NULL);
 264                 pixels = gdk_pixbuf_get_pixels (pixbuf) + gdk_pixbuf_get_rowstride (pixbuf) + 4;
 265         } else {
 266                 pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
 267                                          thumb_width, thumb_height);
 268                 gdk_pixbuf_fill (pixbuf, 0xffffffff);
 269                 pixels = gdk_pixbuf_get_pixels (pixbuf);
 270         }
 271
 272         while (ddjvu_thumbnail_status (djvu_document->d_document, page, 1) < DDJVU_JOB_OK) {
 273                     ddjvu_message_wait (djvu_document->d_context);
 274                     ddjvu_message_pop (djvu_document->d_context);
 275         }
 276
 277         ddjvu_thumbnail_render (djvu_document->d_document, page,
 278                                 &thumb_width, &thumb_height,
 279                                 djvu_document->d_format,
 280                                 gdk_pixbuf_get_rowstride (pixbuf),
 281                                 (gchar *)pixels);
 282
 283         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, rotation);
 284         g_object_unref (pixbuf);
 285
 286         return rotated_pixbuf;
 287 }
 288
 289 static void
 290 djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 291 {
 292         iface->get_thumbnail = djvu_document_thumbnails_get_thumbnail;
 293         iface->get_dimensions = djvu_document_thumbnails_get_dimensions;
 294 }
 295
 296 static void
 297 djvu_document_init (DjvuDocument *djvu_document)
 298 {
 299         djvu_document->d_context = ddjvu_context_create ("Evince");
 300         djvu_document->d_format = ddjvu_format_create (DDJVU_FORMAT_RGB24, 0, 0);
 301         ddjvu_format_set_row_order (djvu_document->d_format,1);
 302
 303         djvu_document->d_document = NULL;
 304 }
 305