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/**
 * This file contains code from ffmpeg, see http://ffmpeg.org/
 *
 * Originated in imgconvert.c: Misc image convertion routines
 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
 *
 * tvtime port Copyright (C) 2003 Billy Biggs <vektor@dumbterm.net>.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <stdio.h>
#if defined (__SVR4) && defined (__sun)
# include <sys/int_types.h>
#else
# include <stdint.h>
#endif

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "attributes.h"
#include "mmx.h"
#include "mm_accel.h"
#include "copyfunctions.h"
#include "deinterlace.h"

/**
 * The MPEG2 spec uses a slightly harsher filter, they specify
 * [-1 8 2 8 -1].  ffmpeg uses a similar filter but with more of
 * a tendancy to blur than to use the local information.  The
 * filter taps here are: [-1 4 2 4 -1].
 */

static void deinterlace_line( uint8_t *dst, uint8_t *lum_m4,
                              uint8_t *lum_m3, uint8_t *lum_m2,
                              uint8_t *lum_m1, uint8_t *lum, int size )
{
#ifdef ARCH_X86
    mmx_t rounder;

    rounder.uw[0]=4;
    rounder.uw[1]=4;
    rounder.uw[2]=4;
    rounder.uw[3]=4;
    pxor_r2r(mm7,mm7);
    movq_m2r(rounder,mm6);

    for (;size > 3; size-=4) {
        movd_m2r(lum_m4[0],mm0);
        movd_m2r(lum_m3[0],mm1);
        movd_m2r(lum_m2[0],mm2);
        movd_m2r(lum_m1[0],mm3);
        movd_m2r(lum[0],mm4);
        punpcklbw_r2r(mm7,mm0);
        punpcklbw_r2r(mm7,mm1);
        punpcklbw_r2r(mm7,mm2);
        punpcklbw_r2r(mm7,mm3);
        punpcklbw_r2r(mm7,mm4);
        paddw_r2r(mm3,mm1);
        psllw_i2r(1,mm2);
        paddw_r2r(mm4,mm0);
        psllw_i2r(2,mm1);// 2
        paddw_r2r(mm6,mm2);
        paddw_r2r(mm2,mm1);
        psubusw_r2r(mm0,mm1);
        psrlw_i2r(3,mm1); // 3
        packuswb_r2r(mm7,mm1);
        movd_r2m(mm1,dst[0]);
        lum_m4+=4;
        lum_m3+=4;
        lum_m2+=4;
        lum_m1+=4;
        lum+=4;
        dst+=4;
    }
    emms();
#else
    /**
     * C implementation.
     */
    int sum;

    for(;size > 0;size--) {
        sum = -lum_m4[0];
        sum += lum_m3[0] << 2;
        sum += lum_m2[0] << 1;
        sum += lum_m1[0] << 2;
        sum += -lum[0];
        dst[0] = (sum + 4) >> 3; // This needs to be clipped at 0 and 255: cm[(sum + 4) >> 3];
        lum_m4++;
        lum_m3++;
        lum_m2++;
        lum_m1++;
        lum++;
        dst++;
    }
#endif
}

static void deinterlace_scanline_vfir( uint8_t *output,
                                       deinterlace_scanline_data_t *data,
                                       int width )
{
    deinterlace_line( output, data->tt1, data->t0, data->m1, data->b0, data->bb1, width*2 );
}

static void copy_scanline( uint8_t *output,
                           deinterlace_scanline_data_t *data,
                           int width )
{
    blit_packed422_scanline( output, data->m0, width );
}


static deinterlace_method_t vfirmethod =
{
    "Blur: Vertical",
    "BlurVertical",
    1,
#ifdef ARCH_X86
    MM_ACCEL_X86_MMXEXT,
#else
    0,
#endif
    0,
    1,
    deinterlace_scanline_vfir,
    copy_scanline,
    0,
    { "Avoids flicker by blurring consecutive frames",
      "of input.  Use this if you want to run your",
      "monitor at an arbitrary refresh rate and not",
      "use much CPU, and are willing to sacrifice",
      "detail.",
      "",
      "Vertical mode blurs favouring the most recent",
      "field for less visible trails.  From the",
      "deinterlacer filter in ffmpeg.",
      "" }
};

deinterlace_method_t *vfir_get_method( void )
{
    return &vfirmethod;
}

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