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_resolution (TiffDocument *tiff_document,
 154                               gfloat       *x_res,
 155                               gfloat       *y_res)
 156 {
 157         gfloat x = 72.0, y = 72.0;
 158         gushort unit;
 159
 160         if (TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x) &&
 161             TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y)) {
 162                 if (TIFFGetFieldDefaulted (tiff_document->tiff, TIFFTAG_RESOLUTIONUNIT, &unit)) {
 163                         if (unit == RESUNIT_CENTIMETER) {
 164                                 x *= 2.54;
 165                                 y *= 2.54;
 166                         }
 167                 }
 168         }
 169
 170         *x_res = x;
 171         *y_res = y;
 172 }
 173
 174 static void
 175 tiff_document_get_page_size (EvDocument   *document,
 176                              int           page,
 177                              double       *width,
 178                              double       *height)
 179 {
 180         guint32 w, h;
 181         gfloat x_res, y_res;
 182         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 183
 184         g_return_if_fail (TIFF_IS_DOCUMENT (document));
 185         g_return_if_fail (tiff_document->tiff != NULL);
 186
 187         push_handlers ();
 188         if (TIFFSetDirectory (tiff_document->tiff, page) != 1) {
 189                 pop_handlers ();
 190                 return;
 191         }
 192
 193         TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &w);
 194         TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &h);
 195         tiff_document_get_resolution (tiff_document, &x_res, &y_res);
 196         h = h * (x_res / y_res);
 197
 198         *width = w;
 199         *height = h;
 200
 201         pop_handlers ();
 202 }
 203
 204 static GdkPixbuf *
 205 tiff_document_render_pixbuf (EvDocument      *document,
 206                              EvRenderContext *rc)
 207 {
 208         TiffDocument *tiff_document = TIFF_DOCUMENT (document);
 209         int width, height;
 210         float x_res, y_res;
 211         gint rowstride, bytes;
 212         guchar *pixels = NULL;
 213         GdkPixbuf *pixbuf;
 214         GdkPixbuf *scaled_pixbuf;
 215         GdkPixbuf *rotated_pixbuf;
 216
 217         g_return_val_if_fail (TIFF_IS_DOCUMENT (document), NULL);
 218         g_return_val_if_fail (tiff_document->tiff != NULL, NULL);
 219
 220         push_handlers ();
 221         if (TIFFSetDirectory (tiff_document->tiff, rc->page) != 1) {
 222                 pop_handlers ();
 223                 return NULL;
 224         }
 225
 226         if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) {
 227                 pop_handlers ();
 228                 return NULL;
 229         }
 230
 231         if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) {
 232                 pop_handlers ();
 233                 return NULL;
 234         }
 235
 236         tiff_document_get_resolution (tiff_document, &x_res, &y_res);
 237
 238         pop_handlers ();
 239
 240         /* Sanity check the doc */
 241         if (width <= 0 || height <= 0)
 242                 return NULL;
 243
 244         rowstride = width * 4;
 245         if (rowstride / 4 != width)
 246                 /* overflow */
 247                 return NULL;
 248
 249         bytes = height * rowstride;
 250         if (bytes / rowstride != height)
 251                 /* overflow */
 252                 return NULL;
 253
 254         pixels = g_try_malloc (bytes);
 255         if (!pixels)
 256                 return NULL;
 257
 258         pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8,
 259                                            width, height, rowstride,
 260                                            (GdkPixbufDestroyNotify) g_free, NULL);
 261
 262         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
 263         TIFFReadRGBAImageOriented (tiff_document->tiff, width, height,
 264                                    (uint32 *)gdk_pixbuf_get_pixels (pixbuf),
 265                                    ORIENTATION_TOPLEFT, 1);
 266         pop_handlers ();
 267
 268         scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf,
 269                                                  width * rc->scale,
 270                                                  height * rc->scale * (x_res / y_res),
 271                                                  GDK_INTERP_BILINEAR);
 272         g_object_unref (pixbuf);
 273
 274         rotated_pixbuf = gdk_pixbuf_rotate_simple (scaled_pixbuf, 360 - rc->rotation);
 275         g_object_unref (scaled_pixbuf);
 276
 277         return rotated_pixbuf;
 278 }
 279
 280 static void
 281 tiff_document_finalize (GObject *object)
 282 {
 283         TiffDocument *tiff_document = TIFF_DOCUMENT (object);
 284
 285         if (tiff_document->tiff)
 286                 TIFFClose (tiff_document->tiff);
 287         if (tiff_document->uri)
 288                 g_free (tiff_document->uri);
 289
 290         G_OBJECT_CLASS (tiff_document_parent_class)->finalize (object);
 291 }
 292
 293 static void
 294 tiff_document_class_init (TiffDocumentClass *klass)
 295 {
 296         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 297
 298         gobject_class->finalize = tiff_document_finalize;
 299 }
 300
 301 static gboolean
 302 tiff_document_can_get_text (EvDocument *document)
 303 {
 304         return FALSE;
 305 }
 306
 307 static EvDocumentInfo *
 308 tiff_document_get_info (EvDocument *document)
 309 {
 310         EvDocumentInfo *info;
 311
 312         info = g_new0 (EvDocumentInfo, 1);
 313         info->fields_mask = 0;
 314
 315         return info;
 316 }
 317
 318 static void
 319 tiff_document_document_iface_init (EvDocumentIface *iface)
 320 {
 321         iface->load = tiff_document_load;
 322         iface->save = tiff_document_save;
 323         iface->can_get_text = tiff_document_can_get_text;
 324         iface->get_n_pages = tiff_document_get_n_pages;
 325         iface->get_page_size = tiff_document_get_page_size;
 326         iface->render_pixbuf = tiff_document_render_pixbuf;
 327         iface->get_info = tiff_document_get_info;
 328 }
 329
 330 static GdkPixbuf *
 331 tiff_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 332                                         EvRenderContext      *rc,
 333                                         gboolean              border)
 334 {
 335         GdkPixbuf *pixbuf;
 336
 337         pixbuf = tiff_document_render_pixbuf (EV_DOCUMENT (document), rc);
 338
 339         if (border) {
 340                 GdkPixbuf *tmp_pixbuf = pixbuf;
 341
 342                 pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 343                 g_object_unref (tmp_pixbuf);
 344         }
 345
 346         return pixbuf;
 347 }
 348
 349 static void
 350 tiff_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 351                                          EvRenderContext      *rc,
 352                                          gint                 *width,
 353                                          gint                 *height)
 354 {
 355         gdouble page_width, page_height;
 356
 357         tiff_document_get_page_size (EV_DOCUMENT (document),
 358                                      rc->page,
 359                                      &page_width, &page_height);
 360
 361         if (rc->rotation == 90 || rc->rotation == 270) {
 362                 *width = (gint) (page_height * rc->scale);
 363                 *height = (gint) (page_width * rc->scale);
 364         } else {
 365                 *width = (gint) (page_width * rc->scale);
 366                 *height = (gint) (page_height * rc->scale);
 367         }
 368 }
 369
 370 static void
 371 tiff_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 372 {
 373         iface->get_thumbnail = tiff_document_thumbnails_get_thumbnail;
 374         iface->get_dimensions = tiff_document_thumbnails_get_dimensions;
 375 }
 376
 377 /* postscript exporter implementation */
 378
 379 static gboolean
 380 tiff_document_file_exporter_format_supported (EvFileExporter      *exporter,
 381                                               EvFileExporterFormat format)
 382 {
 383         return (format == EV_FILE_FORMAT_PS);
 384 }
 385
 386 static void
 387 tiff_document_file_exporter_begin (EvFileExporter      *exporter,
 388                                    EvFileExporterFormat format,
 389                                    const char          *filename,
 390                                    int                  first_page,
 391                                    int                  last_page,
 392                                    double               width,
 393                                    double               height,
 394                                    gboolean             duplex)
 395 {
 396         TiffDocument *document = TIFF_DOCUMENT (exporter);
 397
 398         document->ps_export_ctx = tiff2ps_context_new(filename);
 399 }
 400
 401 static void
 402 tiff_document_file_exporter_do_page (EvFileExporter *exporter, EvRenderContext *rc)
 403 {
 404         TiffDocument *document = TIFF_DOCUMENT (exporter);
 405
 406         if (document->ps_export_ctx == NULL)
 407                 return;
 408         if (TIFFSetDirectory (document->tiff, rc->page) != 1)
 409                 return;
 410         tiff2ps_process_page (document->ps_export_ctx, document->tiff,
 411                               0, 0, 0, 0, 0);
 412 }
 413
 414 static void
 415 tiff_document_file_exporter_end (EvFileExporter *exporter)
 416 {
 417         TiffDocument *document = TIFF_DOCUMENT (exporter);
 418
 419         if (document->ps_export_ctx == NULL)
 420                 return;
 421         tiff2ps_context_finalize(document->ps_export_ctx);
 422 }
 423
 424 static void
 425 tiff_document_document_file_exporter_iface_init (EvFileExporterIface *iface)
 426 {
 427         iface->format_supported = tiff_document_file_exporter_format_supported;
 428         iface->begin = tiff_document_file_exporter_begin;
 429         iface->do_page = tiff_document_file_exporter_do_page;
 430         iface->end = tiff_document_file_exporter_end;
 431 }
 432
 433 static void
 434 tiff_document_init (TiffDocument *tiff_document)
 435 {
 436         tiff_document->n_pages = -1;
 437 }