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diff --git a/include/pdp_resample.h b/include/pdp_resample.h
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+/*
+ * Pure Data Packet header file. - image resampling prototypes
+ * Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef PDP_RESAMPLE_H
+#define PDP_RESAMPLE_H
+
+#include "pdp_types.h"
+
+
+/* image resampling methods */
+void pdp_resample_scale_bilin(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h);
+void pdp_resample_scale_nn(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h);
+
+void pdp_resample_zoom_tiled_bilin(s16 *src_image, s16 *dst_image, s32 w, s32 h,
+ float zoom_x, float zoom_y, float center_x_relative, float center_y_relative);
+
+//void pdp_resample_zoom_tiled_nn(s16 *src_image, s16 *dst_image, s32 w, s32 h, float zoom_x, float zoom_y);
+
+
+
+/* core routines */
+s32 pdp_resample_bilin(s16 *image, s32 width, s32 height, s32 virt_x, s32 virt_y);
+
+
+#endif