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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include <config.h>
  21
  22 #include <config.h>
  23 #include <glib/gi18n-lib.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         EvDocument object;
  35
  36         SpectreDocument *doc;
  37         SpectreExporter *exporter;
  38 };
  39
  40 struct _PSDocumentClass {
  41         EvDocumentClass parent_class;
  42 };
  43
  44 static void ps_document_file_exporter_iface_init       (EvFileExporterInterface       *iface);
  45 static void ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface);
  46
  47 EV_BACKEND_REGISTER_WITH_CODE (PSDocument, ps_document,
  48                          {
  49                                  EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  50                                                                  ps_document_document_thumbnails_iface_init);
  51                                  EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER,
  52                                                                  ps_document_file_exporter_iface_init);
  53                          });
  54
  55 /* PSDocument */
  56 static void
  57 ps_document_init (PSDocument *ps_document)
  58 {
  59 }
  60
  61 static void
  62 ps_document_dispose (GObject *object)
  63 {
  64         PSDocument *ps = PS_DOCUMENT (object);
  65
  66         if (ps->doc) {
  67                 spectre_document_free (ps->doc);
  68                 ps->doc = NULL;
  69         }
  70
  71         if (ps->exporter) {
  72                 spectre_exporter_free (ps->exporter);
  73                 ps->exporter = NULL;
  74         }
  75
  76         G_OBJECT_CLASS (ps_document_parent_class)->dispose (object);
  77 }
  78
  79 /* EvDocumentIface */
  80 static gboolean
  81 ps_document_load (EvDocument *document,
  82                   const char *uri,
  83                   GError    **error)
  84 {
  85         PSDocument *ps = PS_DOCUMENT (document);
  86         gchar      *filename;
  87
  88         filename = g_filename_from_uri (uri, NULL, error);
  89         if (!filename)
  90                 return FALSE;
  91
  92         ps->doc = spectre_document_new ();
  93
  94         spectre_document_load (ps->doc, filename);
  95         if (spectre_document_status (ps->doc)) {
  96                 gchar *filename_dsp;
  97
  98                 filename_dsp = g_filename_display_name (filename);
  99                 g_set_error (error,
 100                              G_FILE_ERROR,
 101                              G_FILE_ERROR_FAILED,
 102                              _("Failed to load document “%s”"),
 103                              filename_dsp);
 104                 g_free (filename_dsp);
 105                 g_free (filename);
 106
 107                 return FALSE;
 108         }
 109
 110         g_free (filename);
 111
 112         return TRUE;
 113 }
 114
 115 static gboolean
 116 ps_document_save (EvDocument *document,
 117                   const char *uri,
 118                   GError    **error)
 119 {
 120         PSDocument *ps = PS_DOCUMENT (document);
 121         gchar      *filename;
 122
 123         filename = g_filename_from_uri (uri, NULL, error);
 124         if (!filename)
 125                 return FALSE;
 126
 127         spectre_document_save (ps->doc, filename);
 128         if (spectre_document_status (ps->doc)) {
 129                 gchar *filename_dsp;
 130
 131                 filename_dsp = g_filename_display_name (filename);
 132                 g_set_error (error,
 133                              G_FILE_ERROR,
 134                              G_FILE_ERROR_FAILED,
 135                              _("Failed to save document “%s”"),
 136                              filename_dsp);
 137                 g_free (filename_dsp);
 138                 g_free (filename);
 139
 140                 return FALSE;
 141         }
 142
 143         g_free (filename);
 144
 145         return TRUE;
 146 }
 147
 148 static int
 149 ps_document_get_n_pages (EvDocument *document)
 150 {
 151         PSDocument *ps = PS_DOCUMENT (document);
 152
 153         return spectre_document_get_n_pages (ps->doc);
 154 }
 155
 156 static EvPage *
 157 ps_document_get_page (EvDocument *document,
 158                       gint        index)
 159 {
 160         PSDocument  *ps = PS_DOCUMENT (document);
 161         SpectrePage *ps_page;
 162         EvPage      *page;
 163
 164         ps_page = spectre_document_get_page (ps->doc, index);
 165         page = ev_page_new (index);
 166         page->backend_page = (EvBackendPage)ps_page;
 167         page->backend_destroy_func = (EvBackendPageDestroyFunc)spectre_page_free;
 168
 169         return page;
 170 }
 171
 172 static gint
 173 get_page_rotation (SpectrePage *page)
 174 {
 175         switch (spectre_page_get_orientation (page)) {
 176                 default:
 177                 case SPECTRE_ORIENTATION_PORTRAIT:
 178                         return 0;
 179                 case SPECTRE_ORIENTATION_LANDSCAPE:
 180                         return 90;
 181                 case SPECTRE_ORIENTATION_REVERSE_PORTRAIT:
 182                         return 180;
 183                 case SPECTRE_ORIENTATION_REVERSE_LANDSCAPE:
 184                         return 270;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static void
 191 ps_document_get_page_size (EvDocument *document,
 192                            EvPage     *page,
 193                            double     *width,
 194                            double     *height)
 195 {
 196         SpectrePage *ps_page;
 197         gdouble      page_width, page_height;
 198         gint         pwidth, pheight;
 199         gint         rotate;
 200
 201         ps_page = (SpectrePage *)page->backend_page;
 202
 203         spectre_page_get_size (ps_page, &pwidth, &pheight);
 204
 205         rotate = get_page_rotation (ps_page);
 206         if (rotate == 90 || rotate == 270) {
 207                 page_height = pwidth;
 208                 page_width = pheight;
 209         } else {
 210                 page_width = pwidth;
 211                 page_height = pheight;
 212         }
 213
 214         if (width) {
 215                 *width = page_width;
 216         }
 217
 218         if (height) {
 219                 *height = page_height;
 220         }
 221 }
 222
 223 static char *
 224 ps_document_get_page_label (EvDocument *document,
 225                             EvPage     *page)
 226 {
 227         return g_strdup (spectre_page_get_label ((SpectrePage *)page->backend_page));
 228 }
 229
 230 static EvDocumentInfo *
 231 ps_document_get_info (EvDocument *document)
 232 {
 233         PSDocument     *ps = PS_DOCUMENT (document);
 234         EvDocumentInfo *info;
 235         const gchar    *creator;
 236         SpectrePage    *ps_page;
 237         gint            width, height;
 238
 239         info = g_new0 (EvDocumentInfo, 1);
 240         info->fields_mask = EV_DOCUMENT_INFO_TITLE |
 241                             EV_DOCUMENT_INFO_FORMAT |
 242                             EV_DOCUMENT_INFO_CREATOR |
 243                             EV_DOCUMENT_INFO_N_PAGES |
 244                             EV_DOCUMENT_INFO_PAPER_SIZE;
 245
 246         creator = spectre_document_get_creator (ps->doc);
 247
 248         ps_page = spectre_document_get_page (ps->doc, 0);
 249         spectre_page_get_size (ps_page, &width, &height);
 250         spectre_page_free (ps_page);
 251
 252         info->title = g_strdup (spectre_document_get_title (ps->doc));
 253         info->format = g_strdup (spectre_document_get_format (ps->doc));
 254         info->creator = g_strdup (creator ? creator : spectre_document_get_for (ps->doc));
 255         info->n_pages = spectre_document_get_n_pages (ps->doc);
 256         info->paper_width  = width / 72.0f * 25.4f;
 257         info->paper_height = height / 72.0f * 25.4f;
 258
 259         return info;
 260 }
 261
 262 static gboolean
 263 ps_document_get_backend_info (EvDocument            *document,
 264                               EvDocumentBackendInfo *info)
 265 {
 266         info->name = "libspectre";
 267         info->version = SPECTRE_VERSION_STRING;
 268
 269         return TRUE;
 270 }
 271
 272 static cairo_surface_t *
 273 ps_document_render (EvDocument      *document,
 274                     EvRenderContext *rc)
 275 {
 276         SpectrePage          *ps_page;
 277         SpectreRenderContext *src;
 278         gint                  width_points;
 279         gint                  height_points;
 280         gint                  width, height;
 281         gint                  swidth, sheight;
 282         guchar               *data = NULL;
 283         gint                  stride;
 284         gint                  rotation;
 285         cairo_surface_t      *surface;
 286         static const cairo_user_data_key_t key;
 287
 288         ps_page = (SpectrePage *)rc->page->backend_page;
 289
 290         spectre_page_get_size (ps_page, &width_points, &height_points);
 291
 292         width = (gint) ((width_points * rc->scale) + 0.5);
 293         height = (gint) ((height_points * rc->scale) + 0.5);
 294         rotation = (rc->rotation + get_page_rotation (ps_page)) % 360;
 295
 296         src = spectre_render_context_new ();
 297         spectre_render_context_set_scale (src,
 298                                           (gdouble)width / width_points,
 299                                           (gdouble)height / height_points);
 300         spectre_render_context_set_rotation (src, rotation);
 301         spectre_page_render (ps_page, src, &data, &stride);
 302         spectre_render_context_free (src);
 303
 304         if (!data) {
 305                 return NULL;
 306         }
 307
 308         if (spectre_page_status (ps_page)) {
 309                 g_warning ("%s", spectre_status_to_string (spectre_page_status (ps_page)));
 310                 g_free (data);
 311
 312                 return NULL;
 313         }
 314
 315         if (rotation == 90 || rotation == 270) {
 316                 swidth = height;
 317                 sheight = width;
 318         } else {
 319                 swidth = width;
 320                 sheight = height;
 321         }
 322
 323         surface = cairo_image_surface_create_for_data (data,
 324                                                        CAIRO_FORMAT_RGB24,
 325                                                        swidth, sheight,
 326                                                        stride);
 327         cairo_surface_set_user_data (surface, &key,
 328                                      data, (cairo_destroy_func_t)g_free);
 329         return surface;
 330 }
 331
 332 static void
 333 ps_document_class_init (PSDocumentClass *klass)
 334 {
 335         GObjectClass    *object_class = G_OBJECT_CLASS (klass);
 336         EvDocumentClass *ev_document_class = EV_DOCUMENT_CLASS (klass);
 337
 338         object_class->dispose = ps_document_dispose;
 339
 340         ev_document_class->load = ps_document_load;
 341         ev_document_class->save = ps_document_save;
 342         ev_document_class->get_n_pages = ps_document_get_n_pages;
 343         ev_document_class->get_page = ps_document_get_page;
 344         ev_document_class->get_page_size = ps_document_get_page_size;
 345         ev_document_class->get_page_label = ps_document_get_page_label;
 346         ev_document_class->get_info = ps_document_get_info;
 347         ev_document_class->get_backend_info = ps_document_get_backend_info;
 348         ev_document_class->render = ps_document_render;
 349 }
 350
 351 /* EvDocumentThumbnailsIface */
 352 static GdkPixbuf *
 353 ps_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document_thumbnails,
 354                                       EvRenderContext      *rc,
 355                                       gboolean              border)
 356 {
 357         PSDocument      *ps = PS_DOCUMENT (document_thumbnails);
 358         cairo_surface_t *surface;
 359         GdkPixbuf       *pixbuf = NULL;
 360
 361         surface = ps_document_render (EV_DOCUMENT (ps), rc);
 362         if (!surface) {
 363                 g_warning ("Error rendering thumbnail");
 364                 return NULL;
 365         }
 366
 367         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 368         cairo_surface_destroy (surface);
 369
 370         if (border) {
 371                 GdkPixbuf *border_pixbuf;
 372
 373                 border_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, pixbuf);
 374                 g_object_unref (pixbuf);
 375                 pixbuf = border_pixbuf;
 376         }
 377
 378         return pixbuf;
 379 }
 380
 381 static void
 382 ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsInterface *iface)
 383 {
 384         iface->get_thumbnail = ps_document_thumbnails_get_thumbnail;
 385 }
 386
 387 /* EvFileExporterIface */
 388 static void
 389 ps_document_file_exporter_begin (EvFileExporter        *exporter,
 390                                  EvFileExporterContext *fc)
 391 {
 392         PSDocument *ps = PS_DOCUMENT (exporter);
 393
 394         if (ps->exporter)
 395                 spectre_exporter_free (ps->exporter);
 396
 397         switch (fc->format) {
 398                 case EV_FILE_FORMAT_PS:
 399                         ps->exporter =
 400                                 spectre_exporter_new (ps->doc,
 401                                                       SPECTRE_EXPORTER_FORMAT_PS);
 402                         break;
 403                 case EV_FILE_FORMAT_PDF:
 404                         ps->exporter =
 405                                 spectre_exporter_new (ps->doc,
 406                                                       SPECTRE_EXPORTER_FORMAT_PDF);
 407                         break;
 408                 default:
 409                         g_assert_not_reached ();
 410         }
 411
 412         spectre_exporter_begin (ps->exporter, fc->filename);
 413 }
 414
 415 static void
 416 ps_document_file_exporter_do_page (EvFileExporter  *exporter,
 417                                    EvRenderContext *rc)
 418 {
 419         PSDocument *ps = PS_DOCUMENT (exporter);
 420
 421         spectre_exporter_do_page (ps->exporter, rc->page->index);
 422 }
 423
 424 static void
 425 ps_document_file_exporter_end (EvFileExporter *exporter)
 426 {
 427         PSDocument *ps = PS_DOCUMENT (exporter);
 428
 429         spectre_exporter_end (ps->exporter);
 430 }
 431
 432 static EvFileExporterCapabilities
 433 ps_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 434 {
 435         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 436                 EV_FILE_EXPORTER_CAN_COPIES |
 437                 EV_FILE_EXPORTER_CAN_COLLATE |
 438                 EV_FILE_EXPORTER_CAN_REVERSE |
 439                 EV_FILE_EXPORTER_CAN_GENERATE_PS |
 440                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 441 }
 442
 443 static void
 444 ps_document_file_exporter_iface_init (EvFileExporterInterface *iface)
 445 {
 446         iface->begin = ps_document_file_exporter_begin;
 447         iface->do_page = ps_document_file_exporter_do_page;
 448         iface->end = ps_document_file_exporter_end;
 449         iface->get_capabilities = ps_document_file_exporter_get_capabilities;
 450 }