1 files changed, 64 insertions, 0 deletions
diff --git a/zbar/qrcode.h b/zbar/qrcode.h
new file mode 100644
index 0000000..01a2fa9
--- /dev/null
+++ b/zbar/qrcode.h
@@ -0,0 +1,64 @@
+/*Copyright (C) 2008-2009  Timothy B. Terriberry (tterribe@xiph.org)
+  You can redistribute this library and/or modify it under the terms of the
+   GNU Lesser General Public License as published by the Free Software
+   Foundation; either version 2.1 of the License, or (at your option) any later
+   version.*/
+#ifndef _QRCODE_H_
+#define _QRCODE_H_
+
+#include <zbar.h>
+
+typedef struct qr_reader qr_reader;
+
+typedef int qr_point[2];
+typedef struct qr_finder_line qr_finder_line;
+
+/*The number of bits of subpel precision to store image coordinates in.
+  This helps when estimating positions in low-resolution images, which may have
+   a module pitch only a pixel or two wide, making rounding errors matter a
+   great deal.*/
+#define QR_FINDER_SUBPREC (2)
+
+/*A line crossing a finder pattern.
+  Whether the line is horizontal or vertical is determined by context.
+  The offsts to various parts of the finder pattern are as follows:
+    |*****|     |*****|*****|*****|     |*****|
+    |*****|     |*****|*****|*****|     |*****|
+       ^        ^                 ^        ^
+       |        |                 |        |
+       |        |                 |       pos[v]+len+eoffs
+       |        |                pos[v]+len
+       |       pos[v]
+      pos[v]-boffs
+  Here v is 0 for horizontal and 1 for vertical lines.*/
+struct qr_finder_line {
+    /*The location of the upper/left endpoint of the line.
+    The left/upper edge of the center section is used, since other lines must
+     cross in this region.*/
+    qr_point pos;
+    /*The length of the center section.
+    This extends to the right/bottom of the center section, since other lines
+     must cross in this region.*/
+    int len;
+    /*The offset to the midpoint of the upper/left section (part of the outside
+     ring), or 0 if we couldn't identify the edge of the beginning section.
+    We use the midpoint instead of the edge because it can be located more
+     reliably.*/
+    int boffs;
+    /*The offset to the midpoint of the end section (part of the outside ring),
+     or 0 if we couldn't identify the edge of the end section.
+    We use the midpoint instead of the edge because it can be located more
+     reliably.*/
+    int eoffs;
+};
+
+qr_reader *_zbar_qr_create(void);
+void _zbar_qr_destroy(qr_reader *reader);
+void _zbar_qr_reset(qr_reader *reader);
+
+int _zbar_qr_found_line(qr_reader *reader, int direction,
+			const qr_finder_line *line);
+int _zbar_qr_decode(qr_reader *reader, zbar_image_scanner_t *iscn,
+		    zbar_image_t *img);
+
+#endif