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-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         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 EvPage *
 168 ps_document_get_page (EvDocument *document,
 169                       gint        index)
 170 {
 171         PSDocument  *ps = PS_DOCUMENT (document);
 172         SpectrePage *ps_page;
 173         EvPage      *page;
 174
 175         ps_page = spectre_document_get_page (ps->doc, index);
 176         page = ev_page_new (index);
 177         page->backend_page = (EvBackendPage)ps_page;
 178         page->backend_destroy_func = (EvBackendPageDestroyFunc)spectre_page_free;
 179
 180         return page;
 181 }
 182
 183 static gint
 184 get_page_rotation (SpectrePage *page)
 185 {
 186         switch (spectre_page_get_orientation (page)) {
 187                 default:
 188                 case SPECTRE_ORIENTATION_PORTRAIT:
 189                         return 0;
 190                 case SPECTRE_ORIENTATION_LANDSCAPE:
 191                         return 90;
 192                 case SPECTRE_ORIENTATION_REVERSE_PORTRAIT:
 193                         return 180;
 194                 case SPECTRE_ORIENTATION_REVERSE_LANDSCAPE:
 195                         return 270;
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void
 202 ps_document_get_page_size (EvDocument *document,
 203                            EvPage     *page,
 204                            double     *width,
 205                            double     *height)
 206 {
 207         SpectrePage *ps_page;
 208         gdouble      page_width, page_height;
 209         gint         pwidth, pheight;
 210         gint         rotate;
 211
 212         ps_page = (SpectrePage *)page->backend_page;
 213
 214         spectre_page_get_size (ps_page, &pwidth, &pheight);
 215
 216         rotate = get_page_rotation (ps_page);
 217         if (rotate == 90 || rotate == 270) {
 218                 page_height = pwidth;
 219                 page_width = pheight;
 220         } else {
 221                 page_width = pwidth;
 222                 page_height = pheight;
 223         }
 224
 225         if (width) {
 226                 *width = page_width;
 227         }
 228
 229         if (height) {
 230                 *height = page_height;
 231         }
 232 }
 233
 234 static char *
 235 ps_document_get_page_label (EvDocument *document,
 236                             EvPage     *page)
 237 {
 238         return g_strdup (spectre_page_get_label ((SpectrePage *)page->backend_page));
 239 }
 240
 241 static EvDocumentInfo *
 242 ps_document_get_info (EvDocument *document)
 243 {
 244         PSDocument     *ps = PS_DOCUMENT (document);
 245         EvDocumentInfo *info;
 246         const gchar    *creator;
 247         SpectrePage    *ps_page;
 248         gint            width, height;
 249
 250         info = g_new0 (EvDocumentInfo, 1);
 251         info->fields_mask = EV_DOCUMENT_INFO_TITLE |
 252                             EV_DOCUMENT_INFO_FORMAT |
 253                             EV_DOCUMENT_INFO_CREATOR |
 254                             EV_DOCUMENT_INFO_N_PAGES |
 255                             EV_DOCUMENT_INFO_PAPER_SIZE;
 256
 257         creator = spectre_document_get_creator (ps->doc);
 258
 259         ps_page = spectre_document_get_page (ps->doc, 0);
 260         spectre_page_get_size (ps_page, &width, &height);
 261         spectre_page_free (ps_page);
 262
 263         info->title = g_strdup (spectre_document_get_title (ps->doc));
 264         info->format = g_strdup (spectre_document_get_format (ps->doc));
 265         info->creator = g_strdup (creator ? creator : spectre_document_get_for (ps->doc));
 266         info->n_pages = spectre_document_get_n_pages (ps->doc);
 267         info->paper_width  = width / 72.0f * 25.4f;
 268         info->paper_height = height / 72.0f * 25.4f;
 269
 270         return info;
 271 }
 272
 273 static cairo_surface_t *
 274 ps_document_render (EvDocument      *document,
 275                     EvRenderContext *rc)
 276 {
 277         SpectrePage          *ps_page;
 278         SpectreRenderContext *src;
 279         gint                  width_points;
 280         gint                  height_points;
 281         gint                  width, height;
 282         gint                  swidth, sheight;
 283         guchar               *data = NULL;
 284         gint                  stride;
 285         gint                  rotation;
 286         cairo_surface_t      *surface;
 287         static const cairo_user_data_key_t key;
 288
 289         ps_page = (SpectrePage *)rc->page->backend_page;
 290
 291         spectre_page_get_size (ps_page, &width_points, &height_points);
 292
 293         width = (gint) ((width_points * rc->scale) + 0.5);
 294         height = (gint) ((height_points * rc->scale) + 0.5);
 295         rotation = (rc->rotation + get_page_rotation (ps_page)) % 360;
 296
 297         src = spectre_render_context_new ();
 298         spectre_render_context_set_scale (src,
 299                                           (gdouble)width / width_points,
 300                                           (gdouble)height / height_points);
 301         spectre_render_context_set_rotation (src, rotation);
 302         spectre_page_render (ps_page, src, &data, &stride);
 303         spectre_render_context_free (src);
 304
 305         if (!data) {
 306                 return NULL;
 307         }
 308
 309         if (spectre_page_status (ps_page)) {
 310                 g_warning ("%s", spectre_status_to_string (spectre_page_status (ps_page)));
 311                 g_free (data);
 312
 313                 return NULL;
 314         }
 315
 316         if (rotation == 90 || rotation == 270) {
 317                 swidth = height;
 318                 sheight = width;
 319         } else {
 320                 swidth = width;
 321                 sheight = height;
 322         }
 323
 324         surface = cairo_image_surface_create_for_data (data,
 325                                                        CAIRO_FORMAT_RGB24,
 326                                                        swidth, sheight,
 327                                                        stride);
 328         cairo_surface_set_user_data (surface, &key,
 329                                      data, (cairo_destroy_func_t)g_free);
 330         return surface;
 331 }
 332
 333 static void
 334 ps_document_document_iface_init (EvDocumentIface *iface)
 335 {
 336         iface->load = ps_document_load;
 337         iface->save = ps_document_save;
 338         iface->get_n_pages = ps_document_get_n_pages;
 339         iface->get_page = ps_document_get_page;
 340         iface->get_page_size = ps_document_get_page_size;
 341         iface->get_page_label = ps_document_get_page_label;
 342         iface->get_info = ps_document_get_info;
 343         iface->render = ps_document_render;
 344 }
 345
 346 /* EvDocumentThumbnailsIface */
 347 static GdkPixbuf *
 348 ps_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document_thumbnails,
 349                                       EvRenderContext      *rc,
 350                                       gboolean              border)
 351 {
 352         PSDocument      *ps = PS_DOCUMENT (document_thumbnails);
 353         cairo_surface_t *surface;
 354         GdkPixbuf       *pixbuf = NULL;
 355
 356         surface = ps_document_render (EV_DOCUMENT (ps), rc);
 357         if (!surface) {
 358                 g_warning ("Error rendering thumbnail");
 359                 return NULL;
 360         }
 361
 362         pixbuf = ev_document_misc_pixbuf_from_surface (surface);
 363         cairo_surface_destroy (surface);
 364
 365         if (border) {
 366                 GdkPixbuf *border_pixbuf;
 367
 368                 border_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, pixbuf);
 369                 g_object_unref (pixbuf);
 370                 pixbuf = border_pixbuf;
 371         }
 372
 373         return pixbuf;
 374 }
 375
 376 static void
 377 ps_document_thumbnails_get_dimensions (EvDocumentThumbnails *document_thumbnails,
 378                                        EvRenderContext      *rc,
 379                                        gint                 *width,
 380                                        gint                 *height)
 381 {
 382         PSDocument *ps = PS_DOCUMENT (document_thumbnails);
 383         gdouble     page_width, page_height;
 384
 385         ps_document_get_page_size (EV_DOCUMENT (ps),
 386                                    rc->page,
 387                                    &page_width, &page_height);
 388
 389         if (rc->rotation == 90 || rc->rotation == 270) {
 390                 *width = (gint) (page_height * rc->scale);
 391                 *height = (gint) (page_width * rc->scale);
 392         } else {
 393                 *width = (gint) (page_width * rc->scale);
 394                 *height = (gint) (page_height * rc->scale);
 395         }
 396 }
 397
 398 static void
 399 ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 400 {
 401         iface->get_thumbnail = ps_document_thumbnails_get_thumbnail;
 402         iface->get_dimensions = ps_document_thumbnails_get_dimensions;
 403 }
 404
 405 /* EvFileExporterIface */
 406 static void
 407 ps_document_file_exporter_begin (EvFileExporter        *exporter,
 408                                  EvFileExporterContext *fc)
 409 {
 410         PSDocument *ps = PS_DOCUMENT (exporter);
 411
 412         if (ps->exporter)
 413                 spectre_exporter_free (ps->exporter);
 414
 415         switch (fc->format) {
 416                 case EV_FILE_FORMAT_PS:
 417                         ps->exporter =
 418                                 spectre_exporter_new (ps->doc,
 419                                                       SPECTRE_EXPORTER_FORMAT_PS);
 420                         break;
 421                 case EV_FILE_FORMAT_PDF:
 422                         ps->exporter =
 423                                 spectre_exporter_new (ps->doc,
 424                                                       SPECTRE_EXPORTER_FORMAT_PDF);
 425                         break;
 426                 default:
 427                         g_assert_not_reached ();
 428         }
 429
 430         spectre_exporter_begin (ps->exporter, fc->filename);
 431 }
 432
 433 static void
 434 ps_document_file_exporter_do_page (EvFileExporter  *exporter,
 435                                    EvRenderContext *rc)
 436 {
 437         PSDocument *ps = PS_DOCUMENT (exporter);
 438
 439         spectre_exporter_do_page (ps->exporter, rc->page->index);
 440 }
 441
 442 static void
 443 ps_document_file_exporter_end (EvFileExporter *exporter)
 444 {
 445         PSDocument *ps = PS_DOCUMENT (exporter);
 446
 447         spectre_exporter_end (ps->exporter);
 448 }
 449
 450 static EvFileExporterCapabilities
 451 ps_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 452 {
 453         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 454                 EV_FILE_EXPORTER_CAN_COPIES |
 455                 EV_FILE_EXPORTER_CAN_COLLATE |
 456                 EV_FILE_EXPORTER_CAN_REVERSE |
 457                 EV_FILE_EXPORTER_CAN_GENERATE_PS |
 458                 EV_FILE_EXPORTER_CAN_GENERATE_PDF;
 459 }
 460
 461 static void
 462 ps_document_file_exporter_iface_init (EvFileExporterIface *iface)
 463 {
 464         iface->begin = ps_document_file_exporter_begin;
 465         iface->do_page = ps_document_file_exporter_do_page;
 466         iface->end = ps_document_file_exporter_end;
 467         iface->get_capabilities = ps_document_file_exporter_get_capabilities;
 468 }