backend/ps/ev-spectre.c

   1 /* this file is part of evince, a gnome document viewer
   2  *
   3  *  Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
   4  *
   5  * Evince is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Evince is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * 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 <config.h>
  23 #include <glib/gi18n.h>
  24 #include <stdlib.h>
  25 #include <libspectre/spectre.h>
  26
  27 #include "ev-spectre.h"
  28
  29 #include "ev-file-exporter.h"
  30 #include "ev-document-thumbnails.h"
  31 #include "ev-document-misc.h"
  32
  33 struct _PSDocument {
  34         GObject object;
  35
  36         SpectreDocument *doc;
  37         SpectreExporter *exporter;
  38 };
  39
  40 struct _PSDocumentClass {
  41         GObjectClass parent_class;
  42 };
  43
  44 static void ps_document_document_iface_init            (EvDocumentIface           *iface);
  45 static void ps_document_file_exporter_iface_init       (EvFileExporterIface       *iface);
  46 static void ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  47
  48 EV_BACKEND_REGISTER_WITH_CODE (PSDocument, ps_document,
  49                          {
  50                                  EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  51                                                                  ps_document_document_thumbnails_iface_init);
  52                                  EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER,
  53                                                                  ps_document_file_exporter_iface_init);
  54                          });
  55
  56 /* PSDocument */
  57 static void
  58 ps_document_init (PSDocument *ps_document)
  59 {
  60 }
  61
  62 static void
  63 ps_document_dispose (GObject *object)
  64 {
  65         PSDocument *ps = PS_DOCUMENT (object);
  66
  67         if (ps->doc) {
  68                 spectre_document_free (ps->doc);
  69                 ps->doc = NULL;
  70         }
  71
  72         if (ps->exporter) {
  73                 spectre_exporter_free (ps->exporter);
  74                 ps->exporter = NULL;
  75         }
  76
  77         G_OBJECT_CLASS (ps_document_parent_class)->dispose (object);
  78 }
  79
  80 static void
  81 ps_document_class_init (PSDocumentClass *klass)
  82 {
  83         GObjectClass *object_class;
  84
  85         object_class = G_OBJECT_CLASS (klass);
  86
  87         object_class->dispose = ps_document_dispose;
  88 }
  89
  90 /* EvDocumentIface */
  91 static gboolean
  92 ps_document_load (EvDocument *document,
  93                   const char *uri,
  94                   GError    **error)
  95 {
  96         PSDocument *ps = PS_DOCUMENT (document);
  97         gchar      *filename;
  98
  99         filename = g_filename_from_uri (uri, NULL, error);
 100         if (!filename)
 101                 return FALSE;
 102
 103         ps->doc = spectre_document_new ();
 104
 105         spectre_document_load (ps->doc, filename);
 106         if (spectre_document_status (ps->doc)) {
 107                 gchar *filename_dsp;
 108
 109                 filename_dsp = g_filename_display_name (filename);
 110                 g_set_error (error,
 111                              G_FILE_ERROR,
 112                              G_FILE_ERROR_FAILED,
 113                              _("Failed to load document “%s”"),
 114                              filename_dsp);
 115                 g_free (filename_dsp);
 116                 g_free (filename);
 117
 118                 return FALSE;
 119         }
 120
 121         g_free (filename);
 122
 123         return TRUE;
 124 }
 125
 126 static gboolean
 127 ps_document_save (EvDocument *document,
 128                   const char *uri,
 129                   GError    **error)
 130 {
 131         PSDocument *ps = PS_DOCUMENT (document);
 132         gchar      *filename;
 133
 134         filename = g_filename_from_uri (uri, NULL, error);
 135         if (!filename)
 136                 return FALSE;
 137
 138         spectre_document_save (ps->doc, filename);
 139         if (spectre_document_status (ps->doc)) {
 140                 gchar *filename_dsp;
 141
 142                 filename_dsp = g_filename_display_name (filename);
 143                 g_set_error (error,
 144                              G_FILE_ERROR,
 145                              G_FILE_ERROR_FAILED,
 146                              _("Failed to save document “%s”"),
 147                              filename_dsp);
 148                 g_free (filename_dsp);
 149                 g_free (filename);
 150
 151                 return FALSE;
 152         }
 153
 154         g_free (filename);
 155
 156         return TRUE;
 157 }
 158
 159 static int
 160 ps_document_get_n_pages (EvDocument *document)
 161 {
 162         PSDocument *ps = PS_DOCUMENT (document);
 163
 164         return spectre_document_get_n_pages (ps->doc);
 165 }
 166
 167 static gint
 168 get_page_rotation (SpectrePage *page)
 169 {
 170         switch (spectre_page_get_orientation (page)) {
 171                 default:
 172                 case SPECTRE_ORIENTATION_PORTRAIT:
 173                         return 0;
 174                 case SPECTRE_ORIENTATION_LANDSCAPE:
 175                         return 90;
 176                 case SPECTRE_ORIENTATION_REVERSE_PORTRAIT:
 177                         return 180;
 178                 case SPECTRE_ORIENTATION_REVERSE_LANDSCAPE:
 179                         return 270;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static void
 186 ps_document_get_page_size (EvDocument *document,
 187                            int         page,
 188                            double     *width,
 189                            double     *height)
 190 {
 191         PSDocument  *ps = PS_DOCUMENT (document);
 192         SpectrePage *ps_page;
 193         gdouble      page_width, page_height;
 194         gint         pwidth, pheight;
 195         gint         rotate;
 196
 197         ps_page = spectre_document_get_page (ps->doc, page);
 198         spectre_page_get_size (ps_page, &pwidth, &pheight);
 199
 200         rotate = get_page_rotation (ps_page);
 201         if (rotate == 90 || rotate == 270) {
 202                 page_height = pwidth;
 203                 page_width = pheight;
 204         } else {
 205                 page_width = pwidth;
 206                 page_height = pheight;
 207         }
 208
 209         spectre_page_free (ps_page);
 210
 211         if (width) {
 212                 *width = page_width;
 213         }
 214
 215         if (height) {
 216                 *height = page_height;
 217         }
 218 }
 219
 220 static char *
 221 ps_document_get_page_label (EvDocument *document,
 222                             int         page)
 223 {
 224         PSDocument  *ps = PS_DOCUMENT (document);
 225         SpectrePage *ps_page;
 226         gchar       *label;
 227
 228         ps_page = spectre_document_get_page (ps->doc, page);
 229         label = g_strdup (spectre_page_get_label (ps_page));
 230         spectre_page_free (ps_page);
 231
 232         return label;
 233 }
 234
 235 static EvDocumentInfo *
 236 ps_document_get_info (EvDocument *document)
 237 {
 238         PSDocument     *ps = PS_DOCUMENT (document);
 239         EvDocumentInfo *info;
 240         const gchar    *creator;
 241         SpectrePage    *ps_page;
 242         gint            width, height;
 243
 244         info = g_new0 (EvDocumentInfo, 1);
 245         info->fields_mask = EV_DOCUMENT_INFO_TITLE |
 246                             EV_DOCUMENT_INFO_FORMAT |
 247                             EV_DOCUMENT_INFO_CREATOR |
 248                             EV_DOCUMENT_INFO_N_PAGES |
 249                             EV_DOCUMENT_INFO_PAPER_SIZE;
 250
 251         creator = spectre_document_get_creator (ps->doc);
 252
 253         ps_page = spectre_document_get_page (ps->doc, 0);
 254         spectre_page_get_size (ps_page, &width, &height);
 255         spectre_page_free (ps_page);
 256
 257         info->title = g_strdup (spectre_document_get_title (ps->doc));
 258         info->format = g_strdup (spectre_document_get_format (ps->doc));
 259         info->creator = g_strdup (creator ? creator : spectre_document_get_for (ps->doc));
 260         info->n_pages = spectre_document_get_n_pages (ps->doc);
 261         info->paper_width  = width / 72.0f * 25.4f;
 262         info->paper_height = height / 72.0f * 25.4f;
 263
 264         return info;
 265 }
 266
 267 static cairo_surface_t *
 268 ps_document_render (EvDocument      *document,
 269                     EvRenderContext *rc)
 270 {
 271         PSDocument           *ps = PS_DOCUMENT (document);
 272         SpectrePage          *ps_page;
 273         SpectreRenderContext *src;
 274         gint                  width_points;
 275         gint                  height_points;
 276         gint                  width, height;
 277         gint                  swidth, sheight;
 278         guchar               *data = NULL;
 279         gint                  stride;
 280         gint                  rotation;
 281         cairo_surface_t      *surface;
 282         static const cairo_user_data_key_t key;
 283
 284         ps_page = spectre_document_get_page (ps->doc, rc->page);
 285         spectre_page_get_size (ps_page, &width_points, &height_points);
 286
 287         width = (gint) ((width_points * rc->scale) + 0.5);
 288         height = (gint) ((height_points * rc->scale) + 0.5);
 289         rotation = (rc->rotation + get_page_rotation (ps_page)) % 360;
 290
 291         src = spectre_render_context_new ();
 292         spectre_render_context_set_scale (src,
 293                                           (gdouble)width / width_points,
 294                                           (gdouble)height / height_points);
 295         spectre_render_context_set_rotation (src, rotation);
 296         spectre_page_render (ps_page, src, &data, &stride);
 297         spectre_render_context_free (src);
 298
 299         if (!data) {
 300                 spectre_page_free (ps_page);
 301                 return NULL;
 302         }
 303
 304         if (spectre_page_status (ps_page)) {
 305                 g_warning (spectre_status_to_string (spectre_page_status (ps_page)));
 306                 g_free (data);
 307                 spectre_page_free (ps_page);
 308
 309                 return NULL;
 310         }
 311
 312         spectre_page_free (ps_page);
 313
 314         if (rotation == 90 || rotation == 270) {
 315                 swidth = height;
 316                 sheight = width;
 317         } else {
 318                 swidth = width;
 319                 sheight = height;
 320         }
 321
 322         surface = cairo_image_surface_create_for_data (data,
 323                                                        CAIRO_FORMAT_RGB24,
 324                                                        swidth, sheight,
 325                                                        stride);
 326         cairo_surface_set_user_data (surface, &key,
 327                                      data, (cairo_destroy_func_t)g_free);
 328         return surface;
 329 }
 330
 331 static void
 332 ps_document_document_iface_init (EvDocumentIface *iface)
 333 {
 334         iface->load = ps_document_load;
 335         iface->save = ps_document_save;
 336         iface->get_n_pages = ps_document_get_n_pages;
 337         iface->get_page_size = ps_document_get_page_size;
 338         iface->get_page_label = ps_document_get_page_label;
 339         iface->get_info = ps_document_get_info;
 340         iface->render = ps_document_render;
 341 }
 342
 343 /* EvDocumentThumbnailsIface */
 344 static GdkPixbuf *
 345 ps_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document_thumbnails,
 346                                       EvRenderContext      *rc,
 347                                       gboolean              border)
 348 {
 349         PSDocument      *ps = PS_DOCUMENT (document_thumbnails);
 350         cairo_surface_t *surface;
 351         GdkPixbuf       *pixbuf = NULL;
 352
 353         surface = ps_document_render (EV_DOCUMENT (ps), rc);
 354         if (!surface) {
 355                 g_warning ("Error rendering thumbnail");
 356                 return NULL;
 357         }
 358
 359         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 360         cairo_surface_destroy (surface);
 361
 362         if (border) {
 363                 GdkPixbuf *border_pixbuf;
 364
 365                 border_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, pixbuf);
 366                 g_object_unref (pixbuf);
 367                 pixbuf = border_pixbuf;
 368         }
 369
 370         return pixbuf;
 371 }
 372
 373 static void
 374 ps_document_thumbnails_get_dimensions (EvDocumentThumbnails *document_thumbnails,
 375                                        EvRenderContext      *rc,
 376                                        gint                 *width,
 377                                        gint                 *height)
 378 {
 379         PSDocument *ps = PS_DOCUMENT (document_thumbnails);
 380         gdouble     page_width, page_height;
 381
 382         ps_document_get_page_size (EV_DOCUMENT (ps),
 383                                    rc->page,
 384                                    &page_width, &page_height);
 385
 386         if (rc->rotation == 90 || rc->rotation == 270) {
 387                 *width = (gint) (page_height * rc->scale);
 388                 *height = (gint) (page_width * rc->scale);
 389         } else {
 390                 *width = (gint) (page_width * rc->scale);
 391                 *height = (gint) (page_height * rc->scale);
 392         }
 393 }
 394
 395 static void
 396 ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 397 {
 398         iface->get_thumbnail = ps_document_thumbnails_get_thumbnail;
 399         iface->get_dimensions = ps_document_thumbnails_get_dimensions;
 400 }
 401
 402 /* EvFileExporterIface */
 403 static void
 404 ps_document_file_exporter_begin (EvFileExporter        *exporter,
 405                                  EvFileExporterContext *fc)
 406 {
 407         PSDocument *ps = PS_DOCUMENT (exporter);
 408
 409         if (ps->exporter)
 410                 spectre_exporter_free (ps->exporter);
 411
 412         switch (fc->format) {
 413                 case EV_FILE_FORMAT_PS:
 414                         ps->exporter =
 415                                 spectre_exporter_new (ps->doc,
 416                                                       SPECTRE_EXPORTER_FORMAT_PS);
 417                         break;
 418                 case EV_FILE_FORMAT_PDF:
 419                         ps->exporter =
 420                                 spectre_exporter_new (ps->doc,
 421                                                       SPECTRE_EXPORTER_FORMAT_PDF);
 422                         break;
 423                 default:
 424                         g_assert_not_reached ();
 425         }
 426
 427         spectre_exporter_begin (ps->exporter, fc->filename);
 428 }
 429
 430 static void
 431 ps_document_file_exporter_do_page (EvFileExporter  *exporter,
 432                                    EvRenderContext *rc)
 433 {
 434         PSDocument *ps = PS_DOCUMENT (exporter);
 435
 436         spectre_exporter_do_page (ps->exporter, rc->page);
 437 }
 438
 439 static void
 440 ps_document_file_exporter_end (EvFileExporter *exporter)
 441 {
 442         PSDocument *ps = PS_DOCUMENT (exporter);
 443
 444         spectre_exporter_end (ps->exporter);
 445 }
 446
 447 static EvFileExporterCapabilities
 448 ps_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 449 {
 450         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 451                 EV_FILE_EXPORTER_CAN_COPIES |
 452                 EV_FILE_EXPORTER_CAN_COLLATE |
 453                 EV_FILE_EXPORTER_CAN_REVERSE |
 454                 EV_FILE_EXPORTER_CAN_GENERATE_PS |
 455                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 456 }
 457
 458 static void
 459 ps_document_file_exporter_iface_init (EvFileExporterIface *iface)
 460 {
 461         iface->begin = ps_document_file_exporter_begin;
 462         iface->do_page = ps_document_file_exporter_do_page;
 463         iface->end = ps_document_file_exporter_end;
 464         iface->get_capabilities = ps_document_file_exporter_get_capabilities;
 465 }