diff options
Diffstat (limited to 'backend/tiff/tiff-document.c')
| -rw-r--r-- | backend/tiff/tiff-document.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/backend/tiff/tiff-document.c b/backend/tiff/tiff-document.c new file mode 100644 index 0000000..24af05f --- /dev/null +++ b/backend/tiff/tiff-document.c @@ -0,0 +1,437 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */ +/* + * Copyright (C) 2005, Jonathan Blandford <jrb@gnome.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* FIXME: Should probably buffer calls to libtiff with TIFFSetWarningHandler + */ + +#include <stdio.h> +#include <glib.h> + +#include "tiffio.h" +#include "tiff2ps.h" +#include "tiff-document.h" +#include "ev-document-misc.h" +#include "ev-document-thumbnails.h" +#include "ev-file-exporter.h" + +struct _TiffDocumentClass +{ + GObjectClass parent_class; +}; + +struct _TiffDocument +{ + GObject parent_instance; + + TIFF *tiff; + gint n_pages; + TIFF2PSContext *ps_export_ctx; + + gchar *uri; +}; + +typedef struct _TiffDocumentClass TiffDocumentClass; + +static void tiff_document_document_iface_init (EvDocumentIface *iface); +static void tiff_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface); +static void tiff_document_document_file_exporter_iface_init (EvFileExporterIface *iface); + +G_DEFINE_TYPE_WITH_CODE (TiffDocument, tiff_document, G_TYPE_OBJECT, + { G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, + tiff_document_document_iface_init); + G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, + tiff_document_document_thumbnails_iface_init); + G_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER, + tiff_document_document_file_exporter_iface_init); + }); + +static TIFFErrorHandler orig_error_handler = NULL; +static TIFFErrorHandler orig_warning_handler = NULL; + +static void +push_handlers (void) +{ + orig_error_handler = TIFFSetErrorHandler (NULL); + orig_warning_handler = TIFFSetWarningHandler (NULL); +} + +static void +pop_handlers (void) +{ + TIFFSetErrorHandler (orig_error_handler); + TIFFSetWarningHandler (orig_warning_handler); +} + +static gboolean +tiff_document_load (EvDocument *document, + const char *uri, + GError **error) +{ + TiffDocument *tiff_document = TIFF_DOCUMENT (document); + gchar *filename; + TIFF *tiff; + + push_handlers (); + filename = g_filename_from_uri (uri, NULL, error); + if (!filename) + { + pop_handlers (); + return FALSE; + } + + tiff = TIFFOpen (filename, "r"); + if (tiff) + { + guint32 w, h; + /* FIXME: unused data? why bother here */ + TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &w); + TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &h); + } + if (!tiff) + { + pop_handlers (); + return FALSE; + } + tiff_document->tiff = tiff; + g_free (tiff_document->uri); + g_free (filename); + tiff_document->uri = g_strdup (uri); + + pop_handlers (); + return TRUE; +} + +static gboolean +tiff_document_save (EvDocument *document, + const char *uri, + GError **error) +{ + TiffDocument *tiff_document = TIFF_DOCUMENT (document); + + return ev_xfer_uri_simple (tiff_document->uri, uri, error); +} + +static int +tiff_document_get_n_pages (EvDocument *document) +{ + TiffDocument *tiff_document = TIFF_DOCUMENT (document); + + g_return_val_if_fail (TIFF_IS_DOCUMENT (document), 0); + g_return_val_if_fail (tiff_document->tiff != NULL, 0); + + if (tiff_document->n_pages == -1) + { + push_handlers (); + tiff_document->n_pages = 0; + do + { + tiff_document->n_pages ++; + } + while (TIFFReadDirectory (tiff_document->tiff)); + pop_handlers (); + } + + return tiff_document->n_pages; +} + +static void +tiff_document_get_page_size (EvDocument *document, + int page, + double *width, + double *height) +{ + guint32 w, h; + gfloat x_res, y_res; + TiffDocument *tiff_document = TIFF_DOCUMENT (document); + + g_return_if_fail (TIFF_IS_DOCUMENT (document)); + g_return_if_fail (tiff_document->tiff != NULL); + + push_handlers (); + if (TIFFSetDirectory (tiff_document->tiff, page) != 1) + { + pop_handlers (); + return; + } + + TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &w); + TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &h); + TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x_res); + TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y_res); + h = h * (x_res / y_res); + + *width = w; + *height = h; + + pop_handlers (); +} + +static GdkPixbuf * +tiff_document_render_pixbuf (EvDocument *document, + EvRenderContext *rc) +{ + TiffDocument *tiff_document = TIFF_DOCUMENT (document); + int width, height; + float x_res, y_res; + gint rowstride, bytes; + guchar *pixels = NULL; + GdkPixbuf *pixbuf; + GdkPixbuf *scaled_pixbuf; + GdkPixbuf *rotated_pixbuf; + + g_return_val_if_fail (TIFF_IS_DOCUMENT (document), 0); + g_return_val_if_fail (tiff_document->tiff != NULL, 0); + + push_handlers (); + if (TIFFSetDirectory (tiff_document->tiff, rc->page) != 1) + { + pop_handlers (); + return NULL; + } + + if (!TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGEWIDTH, &width)) + { + pop_handlers (); + return NULL; + } + + if (! TIFFGetField (tiff_document->tiff, TIFFTAG_IMAGELENGTH, &height)) + { + pop_handlers (); + return NULL; + } + + if (!TIFFGetField (tiff_document->tiff, TIFFTAG_XRESOLUTION, &x_res)) + { + pop_handlers (); + return NULL; + } + + if (! TIFFGetField (tiff_document->tiff, TIFFTAG_YRESOLUTION, &y_res)) + { + pop_handlers (); + return NULL; + } + + pop_handlers (); + + /* Sanity check the doc */ + if (width <= 0 || height <= 0) + return NULL; + + rowstride = width * 4; + if (rowstride / 4 != width) + /* overflow */ + return NULL; + + bytes = height * rowstride; + if (bytes / rowstride != height) + /* overflow */ + return NULL; + + pixels = g_try_malloc (bytes); + if (!pixels) + return NULL; + + pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8, + width, height, rowstride, + (GdkPixbufDestroyNotify) g_free, NULL); + + pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height); + TIFFReadRGBAImageOriented (tiff_document->tiff, width, height, (uint32 *)gdk_pixbuf_get_pixels (pixbuf), ORIENTATION_TOPLEFT, 1); + pop_handlers (); + + scaled_pixbuf = gdk_pixbuf_scale_simple (pixbuf, + width * rc->scale, + height * rc->scale * (x_res/y_res), + GDK_INTERP_BILINEAR); + g_object_unref (pixbuf); + + rotated_pixbuf = gdk_pixbuf_rotate_simple (scaled_pixbuf, 360 - rc->rotation); + g_object_unref (scaled_pixbuf); + + return rotated_pixbuf; +} + +static void +tiff_document_finalize (GObject *object) +{ + TiffDocument *tiff_document = TIFF_DOCUMENT (object); + + if (tiff_document->tiff) + TIFFClose (tiff_document->tiff); + if (tiff_document->uri) + g_free (tiff_document->uri); + + G_OBJECT_CLASS (tiff_document_parent_class)->finalize (object); +} + +static void +tiff_document_class_init (TiffDocumentClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + + gobject_class->finalize = tiff_document_finalize; +} + +static gboolean +tiff_document_can_get_text (EvDocument *document) +{ + return FALSE; +} + +static EvDocumentInfo * +tiff_document_get_info (EvDocument *document) +{ + EvDocumentInfo *info; + + info = g_new0 (EvDocumentInfo, 1); + info->fields_mask = 0; + + return info; +} + +static void +tiff_document_document_iface_init (EvDocumentIface *iface) +{ + iface->load = tiff_document_load; + iface->save = tiff_document_save; + iface->can_get_text = tiff_document_can_get_text; + iface->get_n_pages = tiff_document_get_n_pages; + iface->get_page_size = tiff_document_get_page_size; + iface->render_pixbuf = tiff_document_render_pixbuf; + iface->get_info = tiff_document_get_info; +} + +static GdkPixbuf * +tiff_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document, + gint page, + gint rotation, + gint size, + gboolean border) +{ + EvRenderContext *rc; + GdkPixbuf *pixbuf; + gdouble w, h; + + tiff_document_get_page_size (EV_DOCUMENT (document), + page, + &w, &h); + + rc = ev_render_context_new (rotation, page, size/w); + pixbuf = tiff_document_render_pixbuf (EV_DOCUMENT (document), rc); + g_object_unref (G_OBJECT (rc)); + + if (border) + { + GdkPixbuf *tmp_pixbuf = pixbuf; + pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, 0, tmp_pixbuf); + g_object_unref (tmp_pixbuf); + } + + return pixbuf; +} + +static void +tiff_document_thumbnails_get_dimensions (EvDocumentThumbnails *document, + gint page, + gint suggested_width, + gint *width, + gint *height) +{ + gdouble page_ratio; + gdouble w, h; + + tiff_document_get_page_size (EV_DOCUMENT (document), + page, + &w, &h); + g_return_if_fail (w > 0); + page_ratio = h/w; + *width = suggested_width; + *height = (gint) (suggested_width * page_ratio); +} + +static void +tiff_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface) +{ + iface->get_thumbnail = tiff_document_thumbnails_get_thumbnail; + iface->get_dimensions = tiff_document_thumbnails_get_dimensions; +} + +/* postscript exporter implementation */ + +static gboolean +tiff_document_file_exporter_format_supported (EvFileExporter *exporter, + EvFileExporterFormat format) +{ + return (format == EV_FILE_FORMAT_PS); +} + +static void +tiff_document_file_exporter_begin (EvFileExporter *exporter, + EvFileExporterFormat format, + const char *filename, + int first_page, + int last_page, + double width, + double height, + gboolean duplex) +{ + TiffDocument *document = TIFF_DOCUMENT (exporter); + + document->ps_export_ctx = tiff2ps_context_new(filename); +} + +static void +tiff_document_file_exporter_do_page (EvFileExporter *exporter, EvRenderContext *rc) +{ + TiffDocument *document = TIFF_DOCUMENT (exporter); + + if (document->ps_export_ctx == NULL) + return; + if (TIFFSetDirectory (document->tiff, rc->page) != 1) + return; + tiff2ps_process_page (document->ps_export_ctx, document->tiff, + 0, 0, 0, 0, 0); +} + +static void +tiff_document_file_exporter_end (EvFileExporter *exporter) +{ + TiffDocument *document = TIFF_DOCUMENT (exporter); + + if (document->ps_export_ctx == NULL) + return; + tiff2ps_context_finalize(document->ps_export_ctx); +} + +static void +tiff_document_document_file_exporter_iface_init (EvFileExporterIface *iface) +{ + iface->format_supported = tiff_document_file_exporter_format_supported; + iface->begin = tiff_document_file_exporter_begin; + iface->do_page = tiff_document_file_exporter_do_page; + iface->end = tiff_document_file_exporter_end; +} + +static void +tiff_document_init (TiffDocument *tiff_document) +{ + tiff_document->n_pages = -1; +} |