/*!
 * \copy
 *     Copyright (c)  2009-2013, Cisco Systems
 *     All rights reserved.
 *
 *     Redistribution and use in source and binary forms, with or without
 *     modification, are permitted provided that the following conditions
 *     are met:
 *
 *        * Redistributions of source code must retain the above copyright
 *          notice, this list of conditions and the following disclaimer.
 *
 *        * Redistributions in binary form must reproduce the above copyright
 *          notice, this list of conditions and the following disclaimer in
 *          the documentation and/or other materials provided with the
 *          distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *     POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * \file	sample.c
 *
 * \brief	compute SAD and SATD
 *
 * \date	2009.06.02 Created
 *
 *************************************************************************************
 */

#include "sad_common.h"
#include "macros.h"

int32_t WelsSampleSad4x4_c (uint8_t* pSample1, int32_t iStride1, uint8_t* pSample2, int32_t iStride2) {
  int32_t iSadSum = 0;
  int32_t i = 0;
  uint8_t* pSrc1 = pSample1;
  uint8_t* pSrc2 = pSample2;
  for (i = 0; i < 4; i++) {
    iSadSum += WELS_ABS ((pSrc1[0] - pSrc2[0]));
    iSadSum += WELS_ABS ((pSrc1[1] - pSrc2[1]));
    iSadSum += WELS_ABS ((pSrc1[2] - pSrc2[2]));
    iSadSum += WELS_ABS ((pSrc1[3] - pSrc2[3]));

    pSrc1 += iStride1;
    pSrc2 += iStride2;
  }

  return iSadSum;
}

int32_t WelsSampleSad8x8_c (uint8_t* pSample1, int32_t iStride1, uint8_t* pSample2, int32_t iStride2) {
  int32_t iSadSum = 0;
  int32_t i = 0;
  uint8_t* pSrc1 = pSample1;
  uint8_t* pSrc2 = pSample2;
  for (i = 0; i < 8; i++) {
    iSadSum += WELS_ABS ((pSrc1[0] - pSrc2[0]));
    iSadSum += WELS_ABS ((pSrc1[1] - pSrc2[1]));
    iSadSum += WELS_ABS ((pSrc1[2] - pSrc2[2]));
    iSadSum += WELS_ABS ((pSrc1[3] - pSrc2[3]));
    iSadSum += WELS_ABS ((pSrc1[4] - pSrc2[4]));
    iSadSum += WELS_ABS ((pSrc1[5] - pSrc2[5]));
    iSadSum += WELS_ABS ((pSrc1[6] - pSrc2[6]));
    iSadSum += WELS_ABS ((pSrc1[7] - pSrc2[7]));

    pSrc1 += iStride1;
    pSrc2 += iStride2;
  }

  return iSadSum;
}
int32_t WelsSampleSad16x8_c (uint8_t* pSample1, int32_t iStride1, uint8_t* pSample2, int32_t iStride2) {
  int32_t iSadSum = 0;

  iSadSum += WelsSampleSad8x8_c (pSample1,     iStride1, pSample2,     iStride2);
  iSadSum += WelsSampleSad8x8_c (pSample1 + 8, iStride1, pSample2 + 8, iStride2);

  return iSadSum;
}
int32_t WelsSampleSad8x16_c (uint8_t* pSample1, int32_t iStride1, uint8_t* pSample2, int32_t iStride2) {
  int32_t iSadSum = 0;
  iSadSum += WelsSampleSad8x8_c (pSample1,                   iStride1, pSample2,                   iStride2);
  iSadSum += WelsSampleSad8x8_c (pSample1 + (iStride1 << 3), iStride1, pSample2 + (iStride2 << 3), iStride2);

  return iSadSum;
}
int32_t WelsSampleSad16x16_c (uint8_t* pSample1, int32_t iStride1, uint8_t* pSample2, int32_t iStride2) {
  int32_t iSadSum = 0;
  iSadSum += WelsSampleSad8x8_c (pSample1,                     iStride1, pSample2,                     iStride2);
  iSadSum += WelsSampleSad8x8_c (pSample1 + 8,                   iStride1, pSample2 + 8,                   iStride2);
  iSadSum += WelsSampleSad8x8_c (pSample1 + (iStride1 << 3),   iStride1, pSample2 + (iStride2 << 3),   iStride2);
  iSadSum += WelsSampleSad8x8_c (pSample1 + (iStride1 << 3) + 8, iStride1, pSample2 + (iStride2 << 3) + 8, iStride2);

  return iSadSum;
}

void WelsSampleSadFour16x16_c (uint8_t* iSample1, int32_t iStride1, uint8_t* iSample2, int32_t iStride2,
                               int32_t* pSad) {
  * (pSad)     = WelsSampleSad16x16_c (iSample1, iStride1, (iSample2 - iStride2), iStride2);
  * (pSad + 1) = WelsSampleSad16x16_c (iSample1, iStride1, (iSample2 + iStride2), iStride2);
  * (pSad + 2) = WelsSampleSad16x16_c (iSample1, iStride1, (iSample2 - 1), iStride2);
  * (pSad + 3) = WelsSampleSad16x16_c (iSample1, iStride1, (iSample2 + 1), iStride2);
}
void WelsSampleSadFour16x8_c (uint8_t* iSample1, int32_t iStride1, uint8_t* iSample2, int32_t iStride2, int32_t* pSad) {
  * (pSad)     = WelsSampleSad16x8_c (iSample1, iStride1, (iSample2 - iStride2), iStride2);
  * (pSad + 1) = WelsSampleSad16x8_c (iSample1, iStride1, (iSample2 + iStride2), iStride2);
  * (pSad + 2) = WelsSampleSad16x8_c (iSample1, iStride1, (iSample2 - 1), iStride2);
  * (pSad + 3) = WelsSampleSad16x8_c (iSample1, iStride1, (iSample2 + 1), iStride2);
}
void WelsSampleSadFour8x16_c (uint8_t* iSample1, int32_t iStride1, uint8_t* iSample2, int32_t iStride2, int32_t* pSad) {
  * (pSad)     = WelsSampleSad8x16_c (iSample1, iStride1, (iSample2 - iStride2), iStride2);
  * (pSad + 1) = WelsSampleSad8x16_c (iSample1, iStride1, (iSample2 + iStride2), iStride2);
  * (pSad + 2) = WelsSampleSad8x16_c (iSample1, iStride1, (iSample2 - 1), iStride2);
  * (pSad + 3) = WelsSampleSad8x16_c (iSample1, iStride1, (iSample2 + 1), iStride2);

}
void WelsSampleSadFour8x8_c (uint8_t* iSample1, int32_t iStride1, uint8_t* iSample2, int32_t iStride2, int32_t* pSad) {
  * (pSad)     = WelsSampleSad8x8_c (iSample1, iStride1, (iSample2 - iStride2), iStride2);
  * (pSad + 1) = WelsSampleSad8x8_c (iSample1, iStride1, (iSample2 + iStride2), iStride2);
  * (pSad + 2) = WelsSampleSad8x8_c (iSample1, iStride1, (iSample2 - 1), iStride2);
  * (pSad + 3) = WelsSampleSad8x8_c (iSample1, iStride1, (iSample2 + 1), iStride2);
}
void WelsSampleSadFour4x4_c (uint8_t* iSample1, int32_t iStride1, uint8_t* iSample2, int32_t iStride2, int32_t* pSad) {
  * (pSad)     = WelsSampleSad4x4_c (iSample1, iStride1, (iSample2 - iStride2), iStride2);
  * (pSad + 1) = WelsSampleSad4x4_c (iSample1, iStride1, (iSample2 + iStride2), iStride2);
  * (pSad + 2) = WelsSampleSad4x4_c (iSample1, iStride1, (iSample2 - 1), iStride2);
  * (pSad + 3) = WelsSampleSad4x4_c (iSample1, iStride1, (iSample2 + 1), iStride2);
}