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/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "blockd.h"
void vp8_predict_dc(short *lastdc, short *thisdc, short quant, short *cons)
{
int diff;
int sign;
int last_dc = *lastdc;
int this_dc = *thisdc;
if (*cons > DCPREDCNTTHRESH)
{
this_dc += last_dc;
}
diff = abs(last_dc - this_dc);
sign = (last_dc >> 31) ^(this_dc >> 31);
sign |= (!last_dc | !this_dc);
if (sign)
{
*cons = 0;
}
else
{
if (diff <= DCPREDSIMTHRESH * quant)
(*cons)++ ;
}
*thisdc = this_dc;
*lastdc = this_dc;
}
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