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
  25 #include "mdvi.h"
  26 #include "fonts.h"
  27 #include "pixbuf-device.h"
  28
  29 #include <gtk/gtk.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
  57 typedef struct _DviDocumentClass DviDocumentClass;
  58
  59 static void dvi_document_document_iface_init (EvDocumentIface *iface);
  60 #if 0
  61 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  62 #endif
  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 #if 0
  73       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init)
  74 #endif
  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         return FALSE;
  89
  90     if (dvi_document->context)
  91         mdvi_destroy_context (dvi_document->context);
  92
  93     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
  94
  95     mdvi_pixbuf_device_init (&dvi_document->context->device);
  96
  97     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
  98                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_VMARGIN) / dvi_document->params->hshrink;
  99
 100     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 101                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 102
 103     dvi_context_mutex = g_mutex_new ();
 104
 105     return TRUE;
 106 }
 107
 108
 109 static gboolean
 110 dvi_document_save (EvDocument  *document,
 111                       const char  *uri,
 112                       GError     **error)
 113 {
 114         g_warning ("dvi_document_save not implemented"); /* FIXME */
 115         return TRUE;
 116 }
 117
 118 static int
 119 dvi_document_get_n_pages (EvDocument  *document)
 120 {
 121     DviDocument *dvi_document = DVI_DOCUMENT (document);
 122     return dvi_document->context->npages;
 123 }
 124
 125 static void
 126 dvi_document_get_page_size (EvDocument   *document,
 127                             int       page,
 128                             double    *width,
 129                             double    *height)
 130 {
 131         DviDocument * dvi_document = DVI_DOCUMENT (document);
 132
 133         if (width != NULL)
 134             *width = dvi_document->base_width;
 135
 136         if (height != NULL)
 137             *height = dvi_document->base_height;
 138
 139         return;
 140 }
 141
 142 static GdkPixbuf *
 143 dvi_document_render_pixbuf (EvDocument  *document, int page, double scale)
 144 {
 145         GdkPixbuf *pixbuf;
 146
 147         DviDocument *dvi_document = DVI_DOCUMENT(document);
 148
 149         gint required_width, required_height;
 150         gint proposed_width, proposed_height;
 151         gint xmargin = 0, ymargin = 0;
 152
 153         /* We should protect our context since it's not
 154          * thread safe. The work to the future -
 155          * let context render page independently
 156          */
 157         g_mutex_lock (dvi_context_mutex);
 158
 159         mdvi_setpage(dvi_document->context,  page);
 160
 161         mdvi_set_shrink (dvi_document->context,
 162                          (int)((dvi_document->params->hshrink - 1) / scale) + 1,
 163                          (int)((dvi_document->params->vshrink - 1) / scale) + 1);
 164
 165         required_width = dvi_document->base_width * scale;
 166         required_height = dvi_document->base_height * scale;
 167         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 168         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 169
 170         if (required_width >= proposed_width)
 171             xmargin = (required_width - proposed_width) / 2;
 172         if (required_height >= proposed_height)
 173             ymargin = (required_height - proposed_height) / 2;
 174
 175         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 176
 177         mdvi_pixbuf_device_render (dvi_document->context);
 178
 179         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 180
 181         g_mutex_unlock (dvi_context_mutex);
 182
 183         return pixbuf;
 184 }
 185
 186 static void
 187 dvi_document_finalize (GObject *object)
 188 {
 189         DviDocument *dvi_document = DVI_DOCUMENT(object);
 190
 191         if (dvi_document->context)
 192             {
 193                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 194                 mdvi_destroy_context (dvi_document->context);
 195             }
 196
 197         if (dvi_document->params)
 198                 g_free (dvi_document->params);
 199
 200         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 201 }
 202
 203 static void
 204 dvi_document_set_property (GObject *object,
 205                               guint prop_id,
 206                               const GValue *value,
 207                               GParamSpec *pspec)
 208 {
 209         switch (prop_id)
 210         {
 211                 case PROP_TITLE:
 212                         /* read only */
 213                         break;
 214         }
 215 }
 216
 217 static void
 218 dvi_document_get_property (GObject *object,
 219                               guint prop_id,
 220                               GValue *value,
 221                               GParamSpec *pspec)
 222 {
 223         switch (prop_id)
 224         {
 225                 case PROP_TITLE:
 226                         g_value_set_string (value, NULL);
 227                         break;
 228         }
 229 }
 230
 231 static void
 232 dvi_document_class_init (DviDocumentClass *klass)
 233 {
 234         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 235
 236         gobject_class->finalize = dvi_document_finalize;
 237         gobject_class->get_property = dvi_document_get_property;
 238         gobject_class->set_property = dvi_document_set_property;
 239
 240         g_object_class_override_property (gobject_class, PROP_TITLE, "title");
 241 }
 242
 243 static char *
 244 dvi_document_get_text (EvDocument *document, gint page, EvRectangle *rect)
 245 {
 246         /* FIXME this method should not be in EvDocument */
 247         g_warning ("dvi_document_get_text not implemented");
 248         return NULL;
 249 }
 250
 251 static void
 252 dvi_document_document_iface_init (EvDocumentIface *iface)
 253 {
 254         iface->load = dvi_document_load;
 255         iface->save = dvi_document_save;
 256         iface->get_text = dvi_document_get_text;
 257         iface->get_n_pages = dvi_document_get_n_pages;
 258         iface->get_page_size = dvi_document_get_page_size;
 259         iface->render_pixbuf = dvi_document_render_pixbuf;
 260 }
 261
 262 #if 0
 263 static void
 264 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 265                                            gint                  page,
 266                                            gint                  suggested_width,
 267                                            gint                  *width,
 268                                            gint                  *height)
 269 {
 270         return;
 271 }
 272
 273 static GdkPixbuf *
 274 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails   *document,
 275                                           gint                   page,
 276                                           gint                   width)
 277 {
 278
 279         return NULL;
 280 }
 281
 282 static void
 283 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 284 {
 285         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 286         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 287 }
 288 #endif
 289
 290
 291 static void
 292 dvi_document_init_params (DviDocument *dvi_document)
 293 {
 294         dvi_document->params = g_new0 (DviParams, 1);
 295
 296         dvi_document->params->dpi      = MDVI_DPI;
 297         dvi_document->params->vdpi     = MDVI_VDPI;
 298         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 299         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 300         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 301         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 302         dvi_document->params->hdrift   = 0;
 303         dvi_document->params->vdrift   = 0;
 304         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 305         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 306         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 307
 308         dvi_document->spec = NULL;
 309
 310         dvi_document->params->bg = 0xffffffff;
 311         dvi_document->params->fg = 0xff000000;
 312
 313         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 314
 315         mdvi_register_fonts ();
 316 }
 317
 318 static void
 319 dvi_document_init (DviDocument *dvi_document)
 320 {
 321         dvi_document->context = NULL;
 322         dvi_document_init_params (dvi_document);
 323 }