20060303a

1 files changed, 64 insertions, 0 deletions

diff --git a/libfreetype/ahangles.h b/libfreetype/ahangles.h
new file mode 100644
index 00000000..f46bfaad
--- /dev/null
+++ b/libfreetype/ahangles.h
@@ -0,0 +1,64 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ahangles.h                                                             */
+/*                                                                         */
+/*    A routine used to compute vector angles with limited accuracy        */
+/*    and very high speed (specification).                                 */
+/*                                                                         */
+/*  Copyright 2000-2001, 2002 Catharon Productions Inc.                    */
+/*  Author: David Turner                                                   */
+/*                                                                         */
+/*  This file is part of the Catharon Typography Project and shall only    */
+/*  be used, modified, and distributed under the terms of the Catharon     */
+/*  Open Source License that should come with this file under the name     */
+/*  `CatharonLicense.txt'.  By continuing to use, modify, or distribute    */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/*  Note that this license is compatible with the FreeType license.        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#ifndef __AHANGLES_H__
+#define __AHANGLES_H__
+
+
+#include <ft2build.h>
+#include FT_INTERNAL_OBJECTS_H
+#include "ahtypes.h"
+
+
+FT_BEGIN_HEADER
+
+
+  /* PI expressed in ah_angles -- we don't really need an important */
+  /* precision, so 256 should be enough                             */
+#define AH_PI       256
+#define AH_2PI      ( AH_PI * 2 )
+#define AH_HALF_PI  ( AH_PI / 2 )
+#define AH_2PIMASK  ( AH_2PI - 1 )
+
+  /* the number of bits used to express an arc tangent; */
+  /* see the structure of the lookup table              */
+#define AH_ATAN_BITS  8
+
+  extern
+  const AH_Angle  ah_arctan[1L << AH_ATAN_BITS];
+
+
+  FT_LOCAL( AH_Angle )
+  ah_angle( FT_Vector*  v );
+
+
+  FT_LOCAL( AH_Angle )
+  ah_angle_diff( AH_Angle  angle1,
+                 AH_Angle  angle2 );
+
+
+FT_END_HEADER
+
+#endif /* __AHANGLES_H__ */
+
+
+/* END */