[gnome-scan/gnome-scan-0-6: 12/23] Fix black and white SANE frame support.

[Philipp Sadleder <phsadleder src gnome org>]

commit 31599a3f3fbf46ee7560d85c06c62cd008de6140
Author: Ã?tienne Bersac <bersace src gnome org>
Date:   Wed Jan 14 23:29:23 2009 +0000

    Fix black and white SANE frame support.
    
    svn path=/branches/GNOME_SCAN_0_6/; revision=779
---
 ChangeLog               |    7 +++++++
 modules/gsane-scanner.c |    4 +++-
 2 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 16385f6..6bc75cf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-01-15  Ã?tienne BERSAC  <bersace st-raphael>
+
+	* modules/gsane-scanner.c (gss_data_gray1):
+
+	Fix grey 1bit support : 0 and 1 value are inverted in SANE 1.X
+	standard.
+
 2009-01-14  Philipp Sadleder <philipp sadleder de>
 
 	* lib/gnome-scan-processor-common.c (gnome_scan_processor_common_init):
diff --git a/modules/gsane-scanner.c b/modules/gsane-scanner.c
index edc5fcd..dfe5b68 100644
--- a/modules/gsane-scanner.c
+++ b/modules/gsane-scanner.c
@@ -550,7 +550,9 @@ gss_data_gray1 (GSaneScanner *gss, GeglRectangle *rect, Babl* format, guchar* bu
 	tbuf = g_new0 (guchar, tlen);
 	for (i = 0; i < tlen; i++) {
 		mask = 0x80 >> (i%8);
-		tbuf[i] = (buf[i/8] & mask) ? 0xFF : 0x00;
+		/* 0 means white and 1 means black, that's SANE
+		   standard */
+		tbuf[i] = (buf[i/8] & mask) ? 0x00 : 0xFF;
 	}
 	gegl_buffer_set (GET_PRIVATE (gss)->buffer, rect, format, tbuf,
 			 GEGL_AUTO_ROWSTRIDE);