Use libspectre, if available, for the ps backend. Fixes bugs #317106,

2007-12-20  Carlos Garcia Campos  <carlosgc@gnome.org>
	* configure.ac:
	* backend/ps/Makefile.am:
	* backend/ps/ev-spectre.[ch]:
	Use libspectre, if available, for the ps backend. Fixes bugs
	#317106, #499787, #501235, #421879, #445797, #443859 and #486547.

svn path=/trunk/; revision=2774

3 files changed, 513 insertions, 1 deletions

diff --git a/backend/ps/Makefile.am b/backend/ps/Makefile.am
index e443b4a..921e397 100644
--- a/backend/ps/Makefile.am
+++ b/backend/ps/Makefile.am
@@ -5,8 +5,17 @@ INCLUDES = \
 	$(WARN_CFLAGS)						\
 	$(DISABLE_DEPRECATED)
 
+if HAVE_SPECTRE
+INCLUDES += $(SPECTRE_CFLAGS)
+endif
+
 noinst_LTLIBRARIES = libpsdocument.la
 
+if HAVE_SPECTRE
+libpsdocument_la_SOURCES = 	\
+	ev-spectre.c		\
+	ev-spectre.h
+else
 libpsdocument_la_SOURCES = 	\
 	gsio.c			\
 	gsio.h			\
@@ -19,4 +28,4 @@ libpsdocument_la_SOURCES = 	\
 	ps-interpreter.h	\
 	gsdefaults.c		\
 	gsdefaults.h
-
+endif
diff --git a/backend/ps/ev-spectre.c b/backend/ps/ev-spectre.c
new file mode 100644
index 0000000..a16c0a0
--- /dev/null
+++ b/backend/ps/ev-spectre.c
@@ -0,0 +1,457 @@
+/* this file is part of evince, a gnome document viewer
+ *
+ *  Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
+ *
+ * Evince 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 of the License, or
+ * (at your option) any later version.
+ *
+ * Evince 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.
+ */
+
+#include <glib/gi18n.h>
+#include <stdlib.h>
+#include <libspectre/spectre.h>
+
+#include "ev-spectre.h"
+
+#include "ev-file-exporter.h"
+#include "ev-document-thumbnails.h"
+#include "ev-document-misc.h"
+
+struct _PSDocument {
+	GObject object;
+
+	SpectreDocument *doc;
+	SpectreExporter *exporter;
+};
+
+struct _PSDocumentClass {
+	GObjectClass parent_class;
+};
+
+static void ps_document_document_iface_init            (EvDocumentIface           *iface);
+static void ps_document_file_exporter_iface_init       (EvFileExporterIface       *iface);
+static void ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (PSDocument, ps_document, G_TYPE_OBJECT,
+                         {
+				 G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT,
+							ps_document_document_iface_init);
+				 G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
+							ps_document_document_thumbnails_iface_init);
+				 G_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER,
+							ps_document_file_exporter_iface_init);
+			 });
+
+/* PSDocument */
+static void
+ps_document_init (PSDocument *ps_document)
+{
+}
+
+static void
+ps_document_dispose (GObject *object)
+{
+	PSDocument *ps = PS_DOCUMENT (object);
+
+	if (ps->doc) {
+		spectre_document_free (ps->doc);
+		ps->doc = NULL;
+	}
+
+	if (ps->exporter) {
+		spectre_exporter_free (ps->exporter);
+		ps->exporter = NULL;
+	}
+
+	G_OBJECT_CLASS (ps_document_parent_class)->dispose (object);
+}
+
+static void
+ps_document_class_init (PSDocumentClass *klass)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (klass);
+
+	object_class->dispose = ps_document_dispose;
+}
+
+/* EvDocumentIface */
+static gboolean
+ps_document_load (EvDocument *document,
+		  const char *uri,
+		  GError    **error)
+{
+	PSDocument *ps = PS_DOCUMENT (document);
+	gchar      *filename;
+
+	filename = g_filename_from_uri (uri, NULL, error);
+	if (!filename)
+		return FALSE;
+	
+	ps->doc = spectre_document_new ();
+
+	spectre_document_load (ps->doc, filename);
+	if (spectre_document_status (ps->doc)) {
+		gchar *filename_dsp;
+		
+		filename_dsp = g_filename_display_name (filename);
+		g_set_error (error,
+			     G_FILE_ERROR,
+			     G_FILE_ERROR_FAILED,
+			     _("Failed to load document “%s”"),
+			     filename_dsp);
+		g_free (filename_dsp);
+		g_free (filename);
+
+		return FALSE;
+	}
+
+	g_free (filename);
+
+	return TRUE;
+}
+
+static gboolean
+ps_document_save (EvDocument *document,
+		  const char *uri,
+		  GError    **error)
+{
+	PSDocument *ps = PS_DOCUMENT (document);
+	gchar      *filename;
+
+	filename = g_filename_from_uri (uri, NULL, error);
+	if (!filename)
+		return FALSE;
+
+	spectre_document_save (ps->doc, filename);
+	if (spectre_document_status (ps->doc)) {
+		gchar *filename_dsp;
+
+		filename_dsp = g_filename_display_name (filename);
+		g_set_error (error,
+			     G_FILE_ERROR,
+			     G_FILE_ERROR_FAILED,
+			     _("Failed to save document “%s”"),
+			     filename_dsp);
+		g_free (filename_dsp);
+		g_free (filename);
+
+		return FALSE;
+	}
+
+	g_free (filename);
+
+	return TRUE;
+}
+
+static int
+ps_document_get_n_pages (EvDocument *document)
+{
+	PSDocument *ps = PS_DOCUMENT (document);
+
+	return spectre_document_get_n_pages (ps->doc);
+}
+
+static gint
+get_page_rotation (SpectrePage *page)
+{
+	switch (spectre_page_get_orientation (page)) {
+	        default:
+	        case SPECTRE_ORIENTATION_PORTRAIT:
+			return 0;
+	        case SPECTRE_ORIENTATION_LANDSCAPE:
+			return 90;
+	        case SPECTRE_ORIENTATION_REVERSE_PORTRAIT:
+			return 180;
+	        case SPECTRE_ORIENTATION_REVERSE_LANDSCAPE:
+			return 270;
+	}
+
+	return 0;
+}
+
+static void
+ps_document_get_page_size (EvDocument *document,
+			   int         page,
+			   double     *width,
+			   double     *height)
+{
+	PSDocument  *ps = PS_DOCUMENT (document);
+	SpectrePage *ps_page;
+	gdouble      page_width, page_height;
+	gint         pwidth, pheight;
+	gint         rotate;
+
+	ps_page = spectre_document_get_page (ps->doc, page);
+	spectre_page_get_size (ps_page, &pwidth, &pheight);
+
+	rotate = get_page_rotation (ps_page);
+	if (rotate == 90 || rotate == 270) {
+		page_height = pwidth;
+		page_width = pheight;
+	} else {
+		page_width = pwidth;
+		page_height = pheight;
+	}
+
+	spectre_page_free (ps_page);
+	
+	if (width) {
+		*width = page_width;
+	}
+
+	if (height) {
+		*height = page_height;
+	}
+}
+
+static char *
+ps_document_get_page_label (EvDocument *document,
+			    int         page)
+{
+	PSDocument  *ps = PS_DOCUMENT (document);
+	SpectrePage *ps_page;
+	gchar       *label;
+
+	ps_page = spectre_document_get_page (ps->doc, page);
+	label = g_strdup (spectre_page_get_label (ps_page));
+	spectre_page_free (ps_page);
+	
+	return label;
+}
+
+static EvDocumentInfo *
+ps_document_get_info (EvDocument *document)
+{
+	PSDocument     *ps = PS_DOCUMENT (document);
+	EvDocumentInfo *info;
+	const gchar    *creator;
+	SpectrePage    *ps_page;
+	gint            width, height;
+
+	info = g_new0 (EvDocumentInfo, 1);
+	info->fields_mask = EV_DOCUMENT_INFO_TITLE |
+	                    EV_DOCUMENT_INFO_FORMAT |
+			    EV_DOCUMENT_INFO_CREATOR |
+			    EV_DOCUMENT_INFO_N_PAGES |
+	                    EV_DOCUMENT_INFO_PAPER_SIZE;
+
+	creator = spectre_document_get_creator (ps->doc);
+
+	ps_page = spectre_document_get_page (ps->doc, 0);
+	spectre_page_get_size (ps_page, &width, &height);
+	spectre_page_free (ps_page);
+	
+	info->title = g_strdup (spectre_document_get_title (ps->doc));
+	info->format = g_strdup (spectre_document_get_format (ps->doc));
+	info->creator = g_strdup (creator ? creator : spectre_document_get_for (ps->doc));
+	info->n_pages = spectre_document_get_n_pages (ps->doc);
+	info->paper_width  = width / 72.0f * 25.4f;
+	info->paper_height = height / 72.0f * 25.4f;
+
+	return info;
+}
+
+static cairo_surface_t *
+ps_document_render (EvDocument      *document,
+		    EvRenderContext *rc)
+{
+	PSDocument           *ps = PS_DOCUMENT (document);
+	SpectrePage          *ps_page;
+	SpectreRenderContext *src;
+	gint                  width_points;
+	gint                  height_points;
+	gint                  width, height;
+	gint                  swidth, sheight;
+	guchar               *data = NULL;
+	gint                  stride;
+	gint                  rotation;
+	cairo_surface_t      *surface;
+	static const cairo_user_data_key_t key;
+
+	ps_page = spectre_document_get_page (ps->doc, rc->page);
+	spectre_page_get_size (ps_page, &width_points, &height_points);
+
+	width = (gint) ((width_points * rc->scale) + 0.5);
+	height = (gint) ((height_points * rc->scale) + 0.5);
+	rotation = (rc->rotation + get_page_rotation (ps_page)) % 360;
+
+	src = spectre_render_context_new ();
+	spectre_render_context_set_page_size (src, width, height);
+	spectre_render_context_set_rotation (src, rotation);
+	spectre_page_render (ps_page, src, &data, &stride);
+	spectre_render_context_free (src);
+
+	if (!data) {
+		spectre_page_free (ps_page);
+		return NULL;
+	}
+
+	if (spectre_page_status (ps_page)) {
+		g_warning (spectre_status_to_string (spectre_page_status (ps_page)));
+		g_free (data);
+		spectre_page_free (ps_page);
+		
+		return NULL;
+	}
+
+	spectre_page_free (ps_page);
+
+	if (rotation == 90 || rotation == 270) {
+		swidth = height;
+		sheight = width;
+	} else {
+		swidth = width;
+		sheight = height;
+	}
+	
+	surface = cairo_image_surface_create_for_data (data,
+						       CAIRO_FORMAT_RGB24,
+						       swidth, sheight,
+						       stride);
+	cairo_surface_set_user_data (surface, &key,
+				     data, (cairo_destroy_func_t)g_free);
+	return surface;
+}
+
+static void
+ps_document_document_iface_init (EvDocumentIface *iface)
+{
+	iface->load = ps_document_load;
+	iface->save = ps_document_save;
+	iface->get_n_pages = ps_document_get_n_pages;
+	iface->get_page_size = ps_document_get_page_size;
+	iface->get_page_label = ps_document_get_page_label;
+	iface->get_info = ps_document_get_info;
+	iface->render = ps_document_render;
+}
+
+/* EvDocumentThumbnailsIface */
+static GdkPixbuf *
+ps_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document_thumbnails,
+				      EvRenderContext      *rc, 
+				      gboolean              border)
+{
+	PSDocument      *ps = PS_DOCUMENT (document_thumbnails);
+	cairo_surface_t *surface;
+	GdkPixbuf       *pixbuf = NULL;
+
+	surface = ps_document_render (EV_DOCUMENT (ps), rc);
+	pixbuf = ev_document_misc_pixbuf_from_surface (surface);
+	cairo_surface_destroy (surface);
+
+	if (border) {
+		GdkPixbuf *border_pixbuf;
+		
+		border_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, pixbuf);
+		g_object_unref (pixbuf);
+		pixbuf = border_pixbuf;
+	}
+
+	return pixbuf;
+}
+
+static void
+ps_document_thumbnails_get_dimensions (EvDocumentThumbnails *document_thumbnails,
+				       EvRenderContext      *rc, 
+				       gint                 *width,
+				       gint                 *height)
+{
+	PSDocument *ps = PS_DOCUMENT (document_thumbnails);
+	gdouble     page_width, page_height;
+
+	ps_document_get_page_size (EV_DOCUMENT (ps),
+				   rc->page,
+				   &page_width, &page_height);
+
+	if (rc->rotation == 90 || rc->rotation == 270) {
+		*width = (gint) (page_height * rc->scale);
+		*height = (gint) (page_width * rc->scale);
+	} else {
+		*width = (gint) (page_width * rc->scale);
+		*height = (gint) (page_height * rc->scale);
+	}
+}
+
+static void
+ps_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
+{
+	iface->get_thumbnail = ps_document_thumbnails_get_thumbnail;
+	iface->get_dimensions = ps_document_thumbnails_get_dimensions;
+}
+	
+/* EvFileExporterIface */
+static void
+ps_document_file_exporter_begin (EvFileExporter        *exporter,
+				 EvFileExporterContext *fc)
+{
+	PSDocument *ps = PS_DOCUMENT (exporter);
+
+	if (ps->exporter)
+		spectre_exporter_free (ps->exporter);
+
+	switch (fc->format) {
+	        case EV_FILE_FORMAT_PS:
+			ps->exporter =
+				spectre_exporter_new (ps->doc,
+						      SPECTRE_EXPORTER_FORMAT_PS);
+			break;
+	        case EV_FILE_FORMAT_PDF:
+			ps->exporter =
+				spectre_exporter_new (ps->doc,
+						      SPECTRE_EXPORTER_FORMAT_PDF);
+			break;
+	        default:
+			g_assert_not_reached ();
+	}
+
+	spectre_exporter_begin (ps->exporter, fc->filename);
+}
+
+static void
+ps_document_file_exporter_do_page (EvFileExporter  *exporter,
+				   EvRenderContext *rc)
+{
+	PSDocument *ps = PS_DOCUMENT (exporter);
+
+	spectre_exporter_do_page (ps->exporter, rc->page);
+}
+
+static void
+ps_document_file_exporter_end (EvFileExporter *exporter)
+{
+	PSDocument *ps = PS_DOCUMENT (exporter);
+
+	spectre_exporter_end (ps->exporter);
+}
+
+static EvFileExporterCapabilities
+ps_document_file_exporter_get_capabilities (EvFileExporter *exporter)
+{
+	return  EV_FILE_EXPORTER_CAN_PAGE_SET |
+		EV_FILE_EXPORTER_CAN_COPIES |
+		EV_FILE_EXPORTER_CAN_COLLATE |
+		EV_FILE_EXPORTER_CAN_REVERSE |
+		EV_FILE_EXPORTER_CAN_GENERATE_PS |
+		EV_FILE_EXPORTER_CAN_GENERATE_PDF;
+}
+
+static void
+ps_document_file_exporter_iface_init (EvFileExporterIface *iface)
+{
+	iface->begin = ps_document_file_exporter_begin;
+	iface->do_page = ps_document_file_exporter_do_page;
+	iface->end = ps_document_file_exporter_end;
+	iface->get_capabilities = ps_document_file_exporter_get_capabilities;
+}
diff --git a/backend/ps/ev-spectre.h b/backend/ps/ev-spectre.h
new file mode 100644
index 0000000..fb00f9f
--- /dev/null
+++ b/backend/ps/ev-spectre.h
@@ -0,0 +1,46 @@
+/*
+ * Ghostscript widget for GTK/GNOME
+ * 
+ * Copyright 1998 - 2005 The Free Software Foundation
+ * 
+ * Authors: Jaka Mocnik, Federico Mena (Quartic), Szekeres Istvan (Pista)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __PS_DOCUMENT_H__
+#define __PS_DOCUMENT_H__
+
+#include <glib-object.h>
+
+#include "ev-document.h"
+
+G_BEGIN_DECLS
+
+#define PS_TYPE_DOCUMENT           (ps_document_get_type())
+#define PS_DOCUMENT(obj)           (G_TYPE_CHECK_INSTANCE_CAST ((obj), PS_TYPE_DOCUMENT, PSDocument))
+#define PS_DOCUMENT_CLASS(klass)   (G_TYPE_CHECK_CLASS_CAST ((klass), PS_TYPE_DOCUMENT, PSDocumentClass))
+#define PS_IS_DOCUMENT(obj)        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), PS_TYPE_DOCUMENT))
+#define PS_DOCUMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), PS_TYPE_DOCUMENT, PSDocumentClass))
+
+typedef struct _PSDocument      PSDocument;
+typedef struct _PSDocumentClass PSDocumentClass;
+
+GType ps_document_get_type (void) G_GNUC_CONST;
+
+G_END_DECLS
+
+#endif /* __PS_DOCUMENT_H__ */