[Evolution-hackers] Patch for image scale down

[Frederic Crozat <fcrozat mandrakesoft com>]

The attached patch make evolution uses 
gnome_thumbnail_scale_down_pixbuf instead of gdk_pixbuf_scale_simplified
if it is available (ie on GNOME platform >= 2.2), which fixes big
performance problem when it tries to scale down big images (see bug 
http://qa.mandrakesoft.com/show_bug.cgi?id=6065 ). It also seems mini
pixbuf is re-computed when switching from open to close for inline
attachement (I didn't fix this problem).

This is a known problem in gdk_pixbuf_scale (which can be workarounded
by using gdk_pixbuf_loader_set_size, only with GTK+ 2.2).

Can I commit this to CVS (both branches, I guess) ?
-- 
Frederic Crozat <fcrozat mandrakesoft com>
Mandrakesoft

? .mail-display.c.swp
? evolution-1.4.5-scaledown.patch
? evolution-1.4.5-utf8user.patch
? evolution-1.4.5-utf8user1.patch
Index: ChangeLog
===================================================================
RCS file: /cvs/gnome/evolution/mail/ChangeLog,v
retrieving revision 1.2761.2.31
diff -u -r1.2761.2.31 ChangeLog
--- ChangeLog	6 Oct 2003 18:44:23 -0000	1.2761.2.31
+++ ChangeLog	7 Oct 2003 15:49:43 -0000
@@ -1,3 +1,9 @@
+2003-10-07  Frederic Crozat  <fcrozat mandrakesoft com>
+
+	* mail-display.c: (pixbuf_gen_idle):
+	Use gnome-thumbnail_scale_down_pixbuf if available,
+	for better performance.
+
 2003-10-03  Frederic Crozat  <fcrozat mandrakesoft com>
 
 	* mail-config-druid.c (identity_prepare), (config_wizard_new):
Index: mail-display.c
===================================================================
RCS file: /cvs/gnome/evolution/mail/Attic/mail-display.c,v
retrieving revision 1.282.4.8
diff -u -r1.282.4.8 mail-display.c
--- mail-display.c	18 Sep 2003 08:44:11 -0000	1.282.4.8
+++ mail-display.c	7 Oct 2003 15:49:45 -0000
@@ -52,6 +52,9 @@
 #include <gdk/gdkkeysyms.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <gdk-pixbuf/gdk-pixbuf-loader.h>
+#ifdef GNOME_THUMBNAIL_H
+#include <libgnomeui/gnome-thumbnail.h>
+#endif
 #include <gal/util/e-util.h>
 #include <gal/widgets/e-popup-menu.h>
 
@@ -710,7 +713,11 @@
 		}
 	}
 	
+#ifdef GNOME_THUMBNAIL_H
+	mini = gnome_thumbnail_scale_down_pixbuf (pixbuf, width, height);
+#else
 	mini = gdk_pixbuf_scale_simple (pixbuf, width, height, GDK_INTERP_BILINEAR);
+#endif	
 	if (error || !pbl->mstream)
 		g_object_unref (pixbuf);