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ffmpeg / libavcodec / vp6dsp.c @ 2912e87a

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/**
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 * @file
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 * VP6 DSP-oriented functions
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 *
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 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/common.h"
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#include "vp56dsp.h"
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void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
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                           const int16_t *h_weights, const int16_t *v_weights)
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{
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    int x, y;
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    int tmp[8*11];
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    int *t = tmp;
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    src -= stride;
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    for (y=0; y<11; y++) {
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        for (x=0; x<8; x++) {
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            t[x] = av_clip_uint8((  src[x-1] * h_weights[0]
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                               + src[x  ] * h_weights[1]
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                               + src[x+1] * h_weights[2]
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                               + src[x+2] * h_weights[3] + 64) >> 7);
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        }
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        src += stride;
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        t += 8;
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    }
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    t = tmp + 8;
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    for (y=0; y<8; y++) {
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        for (x=0; x<8; x++) {
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            dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]
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                                 + t[x   ] * v_weights[1]
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                                 + t[x+8 ] * v_weights[2]
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                                 + t[x+16] * v_weights[3] + 64) >> 7);
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        }
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        dst += stride;
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        t += 8;
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    }
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}