libardour added.

[ardour.git] / libs / ardour / ardour / spline.h

diff --git a/libs/ardour/ardour/spline.h b/libs/ardour/ardour/spline.h
new file mode 100644 (file)
index 0000000..de1ece6
--- /dev/null
+++ b/libs/ardour/ardour/spline.h
@@ -0,0 +1,90 @@
+/* This code is based upon work that bore the legend:
+ *
+ * Copyright (C) 1997 David Mosberger
+ *
+ * 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 __ardour_spline_h__
+#define __ardour_spline_h__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct _spline Spline;
+typedef struct _spline_point SplinePoint;
+
+struct _spline_point
+{
+    float x;
+    float y;
+};
+
+Spline *spline_new (void);
+void    spline_free (Spline *);
+
+void    spline_set (Spline *, uint32_t n, SplinePoint *);
+void    spline_add (Spline *, uint32_t n, SplinePoint *);
+void    spline_solve (Spline *);
+float   spline_eval (Spline *, float val);
+void    spline_fill (Spline *, float x0, float x1, float *vec, uint32_t veclen);
+float   spline_get_max_x (Spline *);
+float   spline_get_min_x (Spline *);
+
+struct _spline 
+{
+    float        *deriv2;
+    float        *x;
+    float        *y;
+    float         max_x;
+    float         min_x;
+    SplinePoint  *points;
+    uint32_t npoints;
+    uint32_t space;
+
+#ifdef  __cplusplus
+
+    void set (uint32_t n, SplinePoint *points) {
+           spline_set (this, n, points);
+    }
+
+    void add (uint32_t n, SplinePoint *points) {
+           spline_add (this, n, points);
+    }
+
+    void solve () {
+           spline_solve (this);
+    }
+
+    float eval (float val) {
+           return spline_eval (this, val);
+    }
+    
+    void fill (float x0, float x1, float *vec, uint32_t veclen) {
+           spline_fill (this, x0, x1, vec, veclen);
+    }
+
+#endif /* __cplusplus */
+
+};
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ardour_spline_h__ */