/* intel_init.c - SSE2 optimized filter functions

 *

 * Copyright (c) 2018 Cosmin Truta

 * Copyright (c) 2016-2017 Glenn Randers-Pehrson

 * Written by Mike Klein and Matt Sarett, Google, Inc.

 * Derived from arm/arm_init.c

 *

 * This code is released under the libpng license.

 * For conditions of distribution and use, see the disclaimer

 * and license in png.h

 */

#define png_target_impl "intel-sse"

#include "filter_sse2_intrinsics.c"

static void

png_init_filter_functions_sse2(png_struct *pp, unsigned int bpp)

{

   /* The techniques used to implement each of these filters in SSE operate on

    * one pixel at a time.

    * So they generally speed up 3bpp images about 3x, 4bpp images about 4x.

    * They can scale up to 6 and 8 bpp images and down to 2 bpp images,

    * but they'd not likely have any benefit for 1bpp images.

    * Most of these can be implemented using only MMX and 64-bit registers,

    * but they end up a bit slower than using the equally-ubiquitous SSE2.

   */

   png_debug(1, "in png_init_filter_functions_sse2");

   if (bpp == 3)

   {

      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;

      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_sse2;

      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =

         png_read_filter_row_paeth3_sse2;

   }

   else if (bpp == 4)

   {

      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_sse2;

      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_sse2;

      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =

          png_read_filter_row_paeth4_sse2;

   }

   /* No need optimize PNG_FILTER_VALUE_UP.  The compiler should

    * autovectorize.

    */

}

#define png_target_init_filter_functions_impl png_init_filter_functions_sse2