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
  32 GMutex *dvi_context_mutex = NULL;
  33
  34 enum {
  35         PROP_0,
  36         PROP_TITLE
  37 };
  38
  39 struct _DviDocumentClass
  40 {
  41         GObjectClass parent_class;
  42 };
  43
  44 struct _DviDocument
  45 {
  46         GObject parent_instance;
  47
  48         DviContext *context;
  49         DviPageSpec *spec;
  50         DviParams *params;
  51
  52         /* To let document scale we should remember width and height */
  53
  54         double base_width;
  55         double base_height;
  56 };
  57
  58 typedef struct _DviDocumentClass DviDocumentClass;
  59
  60 static void dvi_document_document_iface_init (EvDocumentIface *iface);
  61 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  62 static void dvi_document_get_page_size                  (EvDocument   *document,
  63                                                          int       page,
  64                                                          double    *width,
  65                                                          double    *height);
  66
  67 G_DEFINE_TYPE_WITH_CODE
  68     (DviDocument, dvi_document, G_TYPE_OBJECT,
  69     {
  70       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, dvi_document_document_iface_init);
  71       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init)
  72      });
  73
  74 static gboolean
  75 dvi_document_load (EvDocument  *document,
  76                       const char  *uri,
  77                       GError     **error)
  78 {
  79     gchar *filename;
  80     DviDocument *dvi_document = DVI_DOCUMENT(document);
  81
  82     filename = g_filename_from_uri (uri, NULL, error);
  83
  84     if (!filename)
  85         return FALSE;
  86
  87     if (dvi_document->context)
  88         mdvi_destroy_context (dvi_document->context);
  89
  90     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
  91
  92     mdvi_pixbuf_device_init (&dvi_document->context->device);
  93
  94     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
  95                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
  96
  97     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
  98                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
  99
 100     dvi_context_mutex = g_mutex_new ();
 101
 102
 103     return TRUE;
 104 }
 105
 106
 107 static gboolean
 108 dvi_document_save (EvDocument  *document,
 109                       const char  *uri,
 110                       GError     **error)
 111 {
 112         g_warning ("dvi_document_save not implemented"); /* FIXME */
 113         return TRUE;
 114 }
 115
 116 static int
 117 dvi_document_get_n_pages (EvDocument  *document)
 118 {
 119     DviDocument *dvi_document = DVI_DOCUMENT (document);
 120     return dvi_document->context->npages;
 121 }
 122
 123 static void
 124 dvi_document_get_page_size (EvDocument   *document,
 125                             int       page,
 126                             double    *width,
 127                             double    *height)
 128 {
 129         DviDocument * dvi_document = DVI_DOCUMENT (document);
 130
 131         if (width != NULL)
 132             *width = dvi_document->base_width;
 133
 134         if (height != NULL)
 135             *height = dvi_document->base_height;
 136
 137         return;
 138 }
 139
 140 static GdkPixbuf *
 141 dvi_document_render_pixbuf (EvDocument  *document, int page, double scale)
 142 {
 143         GdkPixbuf *pixbuf;
 144
 145         DviDocument *dvi_document = DVI_DOCUMENT(document);
 146
 147         gint required_width, required_height;
 148         gint proposed_width, proposed_height;
 149         gint xmargin = 0, ymargin = 0;
 150
 151         /* We should protect our context since it's not
 152          * thread safe. The work to the future -
 153          * let context render page independently
 154          */
 155         g_mutex_lock (dvi_context_mutex);
 156
 157         mdvi_setpage(dvi_document->context,  page);
 158
 159         mdvi_set_shrink (dvi_document->context,
 160                          (int)((dvi_document->params->hshrink - 1) / scale) + 1,
 161                          (int)((dvi_document->params->vshrink - 1) / scale) + 1);
 162
 163         required_width = dvi_document->base_width * scale;
 164         required_height = dvi_document->base_height * scale;
 165         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 166         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 167
 168         if (required_width >= proposed_width)
 169             xmargin = (required_width - proposed_width) / 2;
 170         if (required_height >= proposed_height)
 171             ymargin = (required_height - proposed_height) / 2;
 172
 173         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 174
 175         mdvi_pixbuf_device_render (dvi_document->context);
 176
 177         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 178
 179         g_mutex_unlock (dvi_context_mutex);
 180
 181         return pixbuf;
 182 }
 183
 184 static void
 185 dvi_document_finalize (GObject *object)
 186 {
 187         DviDocument *dvi_document = DVI_DOCUMENT(object);
 188
 189         if (dvi_document->context)
 190             {
 191                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 192                 mdvi_destroy_context (dvi_document->context);
 193             }
 194
 195         if (dvi_document->params)
 196                 g_free (dvi_document->params);
 197
 198         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 199 }
 200
 201
 202 static void
 203 dvi_document_class_init (DviDocumentClass *klass)
 204 {
 205         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 206
 207         gobject_class->finalize = dvi_document_finalize;
 208 }
 209
 210 static gboolean
 211 dvi_document_can_get_text (EvDocument *document)
 212 {
 213         return FALSE;
 214 }
 215
 216 static EvDocumentInfo *
 217 dvi_document_get_info (EvDocument *document)
 218 {
 219         EvDocumentInfo *info;
 220
 221         info = g_new0 (EvDocumentInfo, 1);
 222
 223         return info;
 224 }
 225
 226 static void
 227 dvi_document_document_iface_init (EvDocumentIface *iface)
 228 {
 229         iface->load = dvi_document_load;
 230         iface->save = dvi_document_save;
 231         iface->can_get_text = dvi_document_can_get_text;
 232         iface->get_n_pages = dvi_document_get_n_pages;
 233         iface->get_page_size = dvi_document_get_page_size;
 234         iface->render_pixbuf = dvi_document_render_pixbuf;
 235         iface->get_info = dvi_document_get_info;
 236 }
 237
 238 static void
 239 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 240                                            gint                  page,
 241                                            gint                  suggested_width,
 242                                            gint                  *width,
 243                                            gint                  *height)
 244 {
 245         DviDocument *dvi_document = DVI_DOCUMENT (document);
 246         gdouble page_ratio;
 247
 248         page_ratio = dvi_document->base_height / dvi_document->base_width;
 249         *width = suggested_width;
 250         *height = (gint) (suggested_width * page_ratio);
 251
 252         return;
 253 }
 254
 255 static GdkPixbuf *
 256 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 257                                        gint                      page,
 258                                        gint                      width,
 259                                        gboolean                  border)
 260 {
 261         DviDocument *dvi_document = DVI_DOCUMENT (document);
 262         GdkPixbuf *pixbuf;
 263         GdkPixbuf *border_pixbuf;
 264         gint thumb_width, thumb_height;
 265         gint proposed_width, proposed_height;
 266
 267         dvi_document_thumbnails_get_dimensions (document, page, width, &thumb_width, &thumb_height);
 268
 269         g_mutex_lock (dvi_context_mutex);
 270
 271         mdvi_setpage(dvi_document->context,  page);
 272
 273         mdvi_set_shrink (dvi_document->context,
 274                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 275                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 276
 277         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 278         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 279
 280         if (border) {
 281                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 282                                                  MAX (thumb_width - proposed_width, 0) / 2,
 283                                                  MAX (thumb_height - proposed_height, 0) / 2);
 284         } else {
 285                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 286                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 287                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 288         }
 289
 290
 291         mdvi_pixbuf_device_render (dvi_document->context);
 292         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 293
 294         g_mutex_unlock (dvi_context_mutex);
 295
 296         if (border) {
 297                 border_pixbuf = ev_document_misc_get_thumbnail_frame (thumb_width, thumb_height, NULL);
 298                 gdk_pixbuf_copy_area (pixbuf, 0, 0,
 299                                       thumb_width - 2, thumb_height - 2,
 300                                       border_pixbuf, 2, 2);
 301                 g_object_unref (pixbuf);
 302                 pixbuf = border_pixbuf;
 303         }
 304
 305
 306         return pixbuf;
 307 }
 308
 309 static void
 310 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 311 {
 312         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 313         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 314 }
 315
 316
 317 static void
 318 dvi_document_init_params (DviDocument *dvi_document)
 319 {
 320         dvi_document->params = g_new0 (DviParams, 1);
 321
 322         dvi_document->params->dpi      = MDVI_DPI;
 323         dvi_document->params->vdpi     = MDVI_VDPI;
 324         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 325         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 326         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 327         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 328         dvi_document->params->hdrift   = 0;
 329         dvi_document->params->vdrift   = 0;
 330         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 331         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 332         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 333
 334         dvi_document->spec = NULL;
 335
 336         dvi_document->params->bg = 0xffffffff;
 337         dvi_document->params->fg = 0xff000000;
 338
 339         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 340
 341         mdvi_register_fonts ();
 342 }
 343
 344 static void
 345 dvi_document_init (DviDocument *dvi_document)
 346 {
 347         dvi_document->context = NULL;
 348         dvi_document_init_params (dvi_document);
 349 }