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/**
 * Linear blend deinterlacing plugin.  The idea for this algorithm came
 * from the linear blend deinterlacer which originated in the mplayer
 * sources.
 *
 * 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 "speedtools.h"
#include "copyfunctions.h"
#include "deinterlace.h"

static void deinterlace_scanline_linear_blend( uint8_t *output,
                                               deinterlace_scanline_data_t *data,
                                               int width )
{
    uint8_t *t0 = data->t0;
    uint8_t *b0 = data->b0;
    uint8_t *m1 = data->m1;
#ifdef ARCH_X86
    int i;

    // Get width in bytes.
    width *= 2;
    i = width / 8;
    width -= i * 8;

    pxor_r2r( mm7, mm7 );
    while( i-- ) {
        movd_m2r( *t0, mm0 );
        movd_m2r( *b0, mm1 );
        movd_m2r( *m1, mm2 );

        movd_m2r( *(t0+4), mm3 );
        movd_m2r( *(b0+4), mm4 );
        movd_m2r( *(m1+4), mm5 );

        punpcklbw_r2r( mm7, mm0 );
        punpcklbw_r2r( mm7, mm1 );
        punpcklbw_r2r( mm7, mm2 );

        punpcklbw_r2r( mm7, mm3 );
        punpcklbw_r2r( mm7, mm4 );
        punpcklbw_r2r( mm7, mm5 );

        psllw_i2r( 1, mm2 );
        psllw_i2r( 1, mm5 );
        paddw_r2r( mm0, mm2 );
        paddw_r2r( mm3, mm5 );
        paddw_r2r( mm1, mm2 );
        paddw_r2r( mm4, mm5 );
        psrlw_i2r( 2, mm2 );
        psrlw_i2r( 2, mm5 );
        packuswb_r2r( mm2, mm2 );
        packuswb_r2r( mm5, mm5 );

        movd_r2m( mm2, *output );
        movd_r2m( mm5, *(output+4) );
        output += 8;
        t0 += 8;
        b0 += 8;
        m1 += 8;
    }
    while( width-- ) {
        *output++ = (*t0++ + *b0++ + (*m1++ << 1)) >> 2;
    }
    emms();
#else
    width *= 2;
    while( width-- ) {
        *output++ = (*t0++ + *b0++ + (*m1++ << 1)) >> 2;
    }
#endif
}

static void deinterlace_scanline_linear_blend2( uint8_t *output,
                                                deinterlace_scanline_data_t *data,
                                                int width )
{
    uint8_t *m0 = data->m0;
    uint8_t *t1 = data->t1;
    uint8_t *b1 = data->b1;
#ifdef ARCH_X86
    int i;

    // Get width in bytes.
    width *= 2;
    i = width / 8;
    width -= i * 8;

    pxor_r2r( mm7, mm7 );
    while( i-- ) {
        movd_m2r( *t1, mm0 );
        movd_m2r( *b1, mm1 );
        movd_m2r( *m0, mm2 );

        movd_m2r( *(t1+4), mm3 );
        movd_m2r( *(b1+4), mm4 );
        movd_m2r( *(m0+4), mm5 );

        punpcklbw_r2r( mm7, mm0 );
        punpcklbw_r2r( mm7, mm1 );
        punpcklbw_r2r( mm7, mm2 );

        punpcklbw_r2r( mm7, mm3 );
        punpcklbw_r2r( mm7, mm4 );
        punpcklbw_r2r( mm7, mm5 );

        psllw_i2r( 1, mm2 );
        psllw_i2r( 1, mm5 );
        paddw_r2r( mm0, mm2 );
        paddw_r2r( mm3, mm5 );
        paddw_r2r( mm1, mm2 );
        paddw_r2r( mm4, mm5 );
        psrlw_i2r( 2, mm2 );
        psrlw_i2r( 2, mm5 );
        packuswb_r2r( mm2, mm2 );
        packuswb_r2r( mm5, mm5 );

        movd_r2m( mm2, *output );
        movd_r2m( mm5, *(output+4) );
        output += 8;
        t1 += 8;
        b1 += 8;
        m0 += 8;
    }
    while( width-- ) {
        *output++ = (*t1++ + *b1++ + (*m0++ << 1)) >> 2;
    }
    emms();
#else
    width *= 2;
    while( width-- ) {
        *output++ = (*t1++ + *b1++ + (*m0++ << 1)) >> 2;
    }
#endif
}


static deinterlace_method_t linearblendmethod =
{
    "Blur: Temporal",
    "BlurTemporal",
    2,
#ifdef ARCH_X86
    MM_ACCEL_X86_MMX,
#else
    0,
#endif
    0,
    1,
    deinterlace_scanline_linear_blend,
    deinterlace_scanline_linear_blend2,
    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.",
      "",
      "Temporal mode evenly blurs content for least",
      "flicker, but with visible trails on fast motion.",
      "From the linear blend deinterlacer in mplayer.",
      "" }
};

deinterlace_method_t *linearblend_get_method( void )
{
    return &linearblendmethod;
}

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