/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * RemoteFX Codec Library - Differential Encoding

 *

 * Copyright 2011 Vic Lee

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H

#define FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H

#include <freerdp/codec/rfx.h>

#include <freerdp/api.h>

static INLINE void rfx_differential_decode(INT16* buffer, int size)

{

	INT16* ptr = buffer;

	INT16* end = &buffer[size - 1];

	while (ptr != end)

	{

		ptr[1] += ptr[0];

		ptr++;

	}

}

static INLINE void rfx_differential_encode(INT16* buffer, int size)

{

	INT16 n1, n2;

	INT16* dst;

	for (n1 = *buffer, dst = buffer + 1; size > 1; dst++, size--)

	{

		n2 = *dst;

		*dst -= n1;

		n1 = n2;

	}

}

#endif /* FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H */