/* FreeRDP: A Remote Desktop Protocol Client

 * Add operations.

 * vi:ts=4 sw=4:

 *

 * (c) Copyright 2012 Hewlett-Packard Development Company, L.P.

 * Licensed under the Apache License, Version 2.0 (the "License"); you may

 * not use this file except in compliance with the License. You may obtain

 * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

 * or implied. See the License for the specific language governing

 * permissions and limitations under the License.

 *

 */

#include <freerdp/config.h>

#include <stdint.h>

#include <freerdp/types.h>

#include <freerdp/primitives.h>

#include "prim_internal.h"

#include "prim_add.h"

/* ----------------------------------------------------------------------------

 * 16-bit signed add with saturation (under and over).

 */

static INLINE INT16 add(INT16 a, INT16 b)

{

  INT32 k = (INT32)a + (INT32)b;

  if (k > INT16_MAX)

    return INT16_MAX;

  if (k < INT16_MIN)

    return INT16_MIN;

  return (INT16)k;

}

static pstatus_t general_add_16s(const INT16* WINPR_RESTRICT pSrc1,

                                 const INT16* WINPR_RESTRICT pSrc2, INT16* WINPR_RESTRICT pDst,

                                 UINT32 len)

{

  const UINT32 rem = len % 16;

  const UINT32 align = len - rem;

  for (UINT32 x = 0; x < align; x++)

    *pDst++ = add(*pSrc1++, *pSrc2++);

  for (UINT32 x = 0; x < rem; x++)

    *pDst++ = add(*pSrc1++, *pSrc2++);

  return PRIMITIVES_SUCCESS;

}

static pstatus_t general_add_16s_inplace(INT16* WINPR_RESTRICT pSrcDst1,

                                         INT16* WINPR_RESTRICT pSrcDst2, UINT32 len)

{

  for (UINT32 x = 0; x < len; x++)

  {

    INT16 v = add(pSrcDst1[x], pSrcDst2[x]);

    pSrcDst1[x] = v;

    pSrcDst2[x] = v;

  }

  return PRIMITIVES_SUCCESS;

}

/* ------------------------------------------------------------------------- */

void primitives_init_add(primitives_t* WINPR_RESTRICT prims)

{

  prims->add_16s = general_add_16s;

  prims->add_16s_inplace = general_add_16s_inplace;

}

void primitives_init_add_opt(primitives_t* WINPR_RESTRICT prims)

{

  primitives_init_add(prims);

  primitives_init_add_sse3(prims);

}