backend/tiff/tiff-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, Jonathan Blandford <jrb@gnome.org>
   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 /* FIXME: Should probably buffer calls to libtiff with TIFFSetWarningHandler
  21  */
  22
  23 #include <stdio.h>
  24 #include <glib.h>
  25
  26 #include "tiffio.h"
  27 #include "tiff2ps.h"
  28 #include "tiff-document.h"
  29 #include "ev-document-misc.h"
  30 #include "ev-document-thumbnails.h"
  31 #include "ev-file-exporter.h"
  32
  33 struct _TiffDocumentClass
  34 {
  35   GObjectClass parent_class;
  36 };
  37
  38 struct _TiffDocument
  39 {
  40   GObject parent_instance;
  41
  42   TIFF *tiff;
  43   gint n_pages;
  44   TIFF2PSContext *ps_export_ctx;
  45
  46   gchar *uri;
  47 };
  48
  49 typedef struct _TiffDocumentClass TiffDocumentClass;
  50
  51 static void tiff_document_document_iface_init (EvDocumentIface *iface);
  52 static void tiff_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  53 static void tiff_document_document_file_exporter_iface_init (EvFileExporterIface *iface);
  54
  55 G_DEFINE_TYPE_WITH_CODE (TiffDocument, tiff_document, G_TYPE_OBJECT,
  56                          { G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT,
  57                                                   tiff_document_document_iface_init);
  58                            G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
  59                                                   tiff_document_document_thumbnails_iface_init);
  60                            G_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER,
  61                                                   tiff_document_document_file_exporter_iface_init);
  62                          });
  63
  64 static TIFFErrorHandler orig_error_handler = NULL;
  65 static TIFFErrorHandler orig_warning_handler = NULL;
  66
  67 static void
  68 push_handlers (void)
  69 {
  70         orig_error_handler = TIFFSetErrorHandler (NULL);
  71         orig_warning_handler = TIFFSetWarningHandler (NULL);
  72 }
  73
  74 static void
  75 pop_handlers (void)
  76 {
  77         TIFFSetErrorHandler (orig_error_handler);
  78         TIFFSetWarningHandler (orig_warning_handler);
  79 }
  80
  81 static gboolean
  82 tiff_document_load (EvDocument  *document,
  83                     const char  *uri,
  84                     GError     **error)
  85 {
  86         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
  87         gchar *filename;
  88         TIFF *tiff;
  89
  90         push_handlers ();
  91         filename = g_filename_from_uri (uri, NULL, error);
  92         if (!filename) {
  93                 pop_handlers ();
  94                 return FALSE;
  95         }
  96
  97         tiff = TIFFOpen (filename, "r");
  98         if (tiff) {
  99                 guint32 w, h;
 100
 101                 /* FIXME: unused data? why bother here */
 102                 TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &w);
 103                 TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &h);
 104         }
 105
 106         if (!tiff) {
 107                 pop_handlers ();
 108                 return FALSE;
 109         }
 110
 111         tiff_document->tiff = tiff;
 112         g_free (tiff_document->uri);
 113         g_free (filename);
 114         tiff_document->uri = g_strdup (uri);
 115
 116         pop_handlers ();
 117         return TRUE;
 118 }
 119
 120 static gboolean
 121 tiff_document_save (EvDocument  *document,
 122                     const char  *uri,
 123                     GError     **error)
 124 {
 125         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 126
 127         return ev_xfer_uri_simple (tiff_document->uri, uri, error);
 128 }
 129
 130 static int
 131 tiff_document_get_n_pages (EvDocument  *document)
 132 {
 133         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 134
 135         g_return_val_if_fail (TIFF_IS_DOCUMENT (document), 0);
 136         g_return_val_if_fail (tiff_document->tiff != NULL, 0);
 137
 138         if (tiff_document->n_pages == -1) {
 139                 push_handlers ();
 140                 tiff_document->n_pages = 0;
 141
 142                 do {
 143                         tiff_document->n_pages ++;
 144                 }
 145                 while (TIFFReadDirectory (tiff_document->tiff));
 146                 pop_handlers ();
 147         }
 148
 149         return tiff_document->n_pages;
 150 }
 151
 152 static void
 153 tiff_document_get_page_size (EvDocument   *document,
 154                              int           page,
 155                              double       *width,
 156                              double       *height)
 157 {
 158         guint32 w, h;
 159         gfloat x_res, y_res;
 160         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 161
 162         g_return_if_fail (TIFF_IS_DOCUMENT (document));
 163         g_return_if_fail (tiff_document->tiff != NULL);
 164
 165         push_handlers ();
 166         if (TIFFSetDirectory (tiff_document->tiff, page) != 1) {
 167                 pop_handlers ();
 168                 return;
 169         }
 170
 171         TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &w);
 172         TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &h);
 173         TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x_res);
 174         TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y_res);
 175         h = h * (x_res / y_res);
 176
 177         *width = w;
 178         *height = h;
 179
 180         pop_handlers ();
 181 }
 182
 183 static GdkPixbuf *
 184 tiff_document_render_pixbuf (EvDocument      *document,
 185                              EvRenderContext *rc)
 186 {
 187         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 188         int width, height;
 189         float x_res, y_res;
 190         gint rowstride, bytes;
 191         guchar *pixels = NULL;
 192         GdkPixbuf *pixbuf;
 193         GdkPixbuf *scaled_pixbuf;
 194         GdkPixbuf *rotated_pixbuf;
 195
 196         g_return_val_if_fail (TIFF_IS_DOCUMENT (document), NULL);
 197         g_return_val_if_fail (tiff_document->tiff != NULL, NULL);
 198
 199         push_handlers ();
 200         if (TIFFSetDirectory (tiff_document->tiff, rc->page) != 1) {
 201                 pop_handlers ();
 202                 return NULL;
 203         }
 204
 205         if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) {
 206                 pop_handlers ();
 207                 return NULL;
 208         }
 209
 210         if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) {
 211                 pop_handlers ();
 212                 return NULL;
 213         }
 214
 215         if (!TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x_res)) {
 216                 pop_handlers ();
 217                 return NULL;
 218         }
 219
 220         if (! TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y_res)) {
 221                 pop_handlers ();
 222                 return NULL;
 223         }
 224
 225         pop_handlers ();
 226
 227         /* Sanity check the doc */
 228         if (width <= 0 || height <= 0)
 229                 return NULL;
 230
 231         rowstride = width * 4;
 232         if (rowstride / 4 != width)
 233                 /* overflow */
 234                 return NULL;
 235
 236         bytes = height * rowstride;
 237         if (bytes / rowstride != height)
 238                 /* overflow */
 239                 return NULL;
 240
 241         pixels = g_try_malloc (bytes);
 242         if (!pixels)
 243                 return NULL;
 244
 245         pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8,
 246                                            width, height, rowstride,
 247                                            (GdkPixbufDestroyNotify) g_free, NULL);
 248
 249         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
 250         TIFFReadRGBAImageOriented (tiff_document->tiff, width, height, (uint32 *)gdk_pixbuf_get_pixels (pixbuf), ORIENTATION_TOPLEFT, 1);
 251         pop_handlers ();
 252
 253         scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
 254                                                  width * rc->scale,
 255                                                  height * rc->scale * (x_res/y_res),
 256                                                  GDK_INTERP_BILINEAR);
 257         g_object_unref (pixbuf);
 258
 259         rotated_pixbuf = gdk_pixbuf_rotate_simple (scaled_pixbuf, 360 - rc->rotation);
 260         g_object_unref (scaled_pixbuf);
 261
 262         return rotated_pixbuf;
 263 }
 264
 265 static void
 266 tiff_document_finalize (GObject *object)
 267 {
 268         TiffDocument *tiff_document = TIFF_DOCUMENT (object);
 269
 270         if (tiff_document->tiff)
 271                 TIFFClose (tiff_document->tiff);
 272         if (tiff_document->uri)
 273                 g_free (tiff_document->uri);
 274
 275         G_OBJECT_CLASS (tiff_document_parent_class)->finalize (object);
 276 }
 277
 278 static void
 279 tiff_document_class_init (TiffDocumentClass *klass)
 280 {
 281         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 282
 283         gobject_class->finalize = tiff_document_finalize;
 284 }
 285
 286 static gboolean
 287 tiff_document_can_get_text (EvDocument *document)
 288 {
 289         return FALSE;
 290 }
 291
 292 static EvDocumentInfo *
 293 tiff_document_get_info (EvDocument *document)
 294 {
 295         EvDocumentInfo *info;
 296
 297         info = g_new0 (EvDocumentInfo, 1);
 298         info->fields_mask = 0;
 299
 300         return info;
 301 }
 302
 303 static void
 304 tiff_document_document_iface_init (EvDocumentIface *iface)
 305 {
 306         iface->load = tiff_document_load;
 307         iface->save = tiff_document_save;
 308         iface->can_get_text = tiff_document_can_get_text;
 309         iface->get_n_pages = tiff_document_get_n_pages;
 310         iface->get_page_size = tiff_document_get_page_size;
 311         iface->render_pixbuf = tiff_document_render_pixbuf;
 312         iface->get_info = tiff_document_get_info;
 313 }
 314
 315 static GdkPixbuf *
 316 tiff_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 317                                         EvRenderContext      *rc,
 318                                         gboolean              border)
 319 {
 320         GdkPixbuf *pixbuf;
 321
 322         pixbuf = tiff_document_render_pixbuf (EV_DOCUMENT (document), rc);
 323
 324         if (border) {
 325                 GdkPixbuf *tmp_pixbuf = pixbuf;
 326
 327                 pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 328                 g_object_unref (tmp_pixbuf);
 329         }
 330
 331         return pixbuf;
 332 }
 333
 334 static void
 335 tiff_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 336                                          EvRenderContext      *rc,
 337                                          gint                 *width,
 338                                          gint                 *height)
 339 {
 340         gdouble page_width, page_height;
 341
 342         tiff_document_get_page_size (EV_DOCUMENT (document),
 343                                      rc->page,
 344                                      &page_width, &page_height);
 345
 346         if (rc->rotation == 90 || rc->rotation == 270) {
 347                 *width = (gint) (page_height * rc->scale);
 348                 *height = (gint) (page_width * rc->scale);
 349         } else {
 350                 *width = (gint) (page_width * rc->scale);
 351                 *height = (gint) (page_height * rc->scale);
 352         }
 353 }
 354
 355 static void
 356 tiff_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 357 {
 358         iface->get_thumbnail = tiff_document_thumbnails_get_thumbnail;
 359         iface->get_dimensions = tiff_document_thumbnails_get_dimensions;
 360 }
 361
 362 /* postscript exporter implementation */
 363
 364 static gboolean
 365 tiff_document_file_exporter_format_supported (EvFileExporter      *exporter,
 366                                               EvFileExporterFormat format)
 367 {
 368         return (format == EV_FILE_FORMAT_PS);
 369 }
 370
 371 static void
 372 tiff_document_file_exporter_begin (EvFileExporter      *exporter,
 373                                    EvFileExporterFormat format,
 374                                    const char          *filename,
 375                                    int                  first_page,
 376                                    int                  last_page,
 377                                    double               width,
 378                                    double               height,
 379                                    gboolean             duplex)
 380 {
 381         TiffDocument *document = TIFF_DOCUMENT (exporter);
 382
 383         document->ps_export_ctx = tiff2ps_context_new(filename);
 384 }
 385
 386 static void
 387 tiff_document_file_exporter_do_page (EvFileExporter *exporter, EvRenderContext *rc)
 388 {
 389         TiffDocument *document = TIFF_DOCUMENT (exporter);
 390
 391         if (document->ps_export_ctx == NULL)
 392                 return;
 393         if (TIFFSetDirectory (document->tiff, rc->page) != 1)
 394                 return;
 395         tiff2ps_process_page (document->ps_export_ctx, document->tiff,
 396                               0, 0, 0, 0, 0);
 397 }
 398
 399 static void
 400 tiff_document_file_exporter_end (EvFileExporter *exporter)
 401 {
 402         TiffDocument *document = TIFF_DOCUMENT (exporter);
 403
 404         if (document->ps_export_ctx == NULL)
 405                 return;
 406         tiff2ps_context_finalize(document->ps_export_ctx);
 407 }
 408
 409 static void
 410 tiff_document_document_file_exporter_iface_init (EvFileExporterIface *iface)
 411 {
 412         iface->format_supported = tiff_document_file_exporter_format_supported;
 413         iface->begin = tiff_document_file_exporter_begin;
 414         iface->do_page = tiff_document_file_exporter_do_page;
 415         iface->end = tiff_document_file_exporter_end;
 416 }
 417
 418 static void
 419 tiff_document_init (TiffDocument *tiff_document)
 420 {
 421         tiff_document->n_pages = -1;
 422 }