Blame libfreerdp/codec/rfx_differential.h

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/**
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 * FreeRDP: A Remote Desktop Protocol Implementation
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 * RemoteFX Codec Library - Differential Encoding
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 *
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 * Copyright 2011 Vic Lee
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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#ifndef FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H
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#define FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H
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#include <freerdp/codec/rfx.h>
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#include <freerdp/api.h>
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static INLINE void rfx_differential_decode(INT16* buffer, int size)
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{
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	INT16* ptr = buffer;
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	INT16* end = &buffer[size - 1];
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	while (ptr != end)
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	{
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		ptr[1] += ptr[0];
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		ptr++;
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	}
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}
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static INLINE void rfx_differential_encode(INT16* buffer, int size)
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{
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	INT16 n1, n2;
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	INT16* dst;
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	for (n1 = *buffer, dst = buffer + 1; size > 1; dst++, size--)
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	{
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		n2 = *dst;
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		*dst -= n1;
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		n1 = n2;
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	}
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}
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#endif /* FREERDP_LIB_CODEC_RFX_DIFFERENTIAL_H */