/*! * \copy *     Copyright (c)  2008-2013, 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. * *  downsample_yuv.c * *  Abstract *      Implementation for source yuv data downsampling used before spatial encoding. * *  History *      10/24/2008 Created * *****************************************************************************/ #include "downsample.h"  WELSVP_NAMESPACE_BEGIN  void DyadicBilinearDownsampler_c (uint8_t* pDst, const int32_t kiDstStride,                                  uint8_t* pSrc, const int32_t kiSrcStride,                                  const int32_t kiSrcWidth, const int32_t kiSrcHeight) {  uint8_t* pDstLine	= pDst;  uint8_t* pSrcLine	= pSrc;  const int32_t kiSrcStridex2	= kiSrcStride << 1;  const int32_t kiDstWidth		= kiSrcWidth >> 1;  const int32_t kiDstHeight	= kiSrcHeight >> 1;   for (int32_t j = 0; j < kiDstHeight; j ++) {    for (int32_t i = 0; i < kiDstWidth; i ++) {      const int32_t kiSrcX = i << 1;      const int32_t kiTempRow1 = (pSrcLine[kiSrcX] + pSrcLine[kiSrcX + 1] + 1) >> 1;      const int32_t kiTempRow2 = (pSrcLine[kiSrcX + kiSrcStride] + pSrcLine[kiSrcX + kiSrcStride + 1] + 1) >> 1;       pDstLine[i] = (uint8_t) ((kiTempRow1 + kiTempRow2 + 1) >> 1);    }    pDstLine	+= kiDstStride;    pSrcLine	+= kiSrcStridex2;  }} void GeneralBilinearFastDownsampler_c (uint8_t* pDst, const int32_t kiDstStride, const int32_t kiDstWidth,                                       const int32_t kiDstHeight,                                       uint8_t* pSrc, const int32_t kiSrcStride, const int32_t kiSrcWidth, const int32_t kiSrcHeight) {  const uint32_t kuiScaleBitWidth = 16, kuiScaleBitHeight = 15;  const uint32_t kuiScaleWidth = (1 << kuiScaleBitWidth), kuiScaleHeight = (1 << kuiScaleBitHeight);  int32_t fScalex = (int32_t) ((float)kiSrcWidth / (float)kiDstWidth * kuiScaleWidth);  int32_t fScaley = (int32_t) ((float)kiSrcHeight / (float)kiDstHeight * kuiScaleHeight);  uint32_t x;  int32_t iYInverse, iXInverse;   uint8_t* pByDst = pDst;  uint8_t* pByLineDst = pDst;   iYInverse = 1 << (kuiScaleBitHeight - 1);  for (int32_t i = 0; i < kiDstHeight - 1; i++) {    int32_t iYy = iYInverse >> kuiScaleBitHeight;    int32_t fv = iYInverse & (kuiScaleHeight - 1);     uint8_t* pBySrc = pSrc + iYy * kiSrcStride;     pByDst = pByLineDst;    iXInverse = 1 << (kuiScaleBitWidth - 1);    for (int32_t j = 0; j < kiDstWidth - 1; j++) {      int32_t iXx = iXInverse >> kuiScaleBitWidth;      int32_t iFu = iXInverse & (kuiScaleWidth - 1);       uint8_t* pByCurrent = pBySrc + iXx;      uint8_t a, b, c, d;       a = *pByCurrent;      b = * (pByCurrent + 1);      c = * (pByCurrent + kiSrcStride);      d = * (pByCurrent + kiSrcStride + 1);       x  = (((uint32_t) (kuiScaleWidth - 1 - iFu)) * (kuiScaleHeight - 1 - fv) >> kuiScaleBitWidth) * a;      x += (((uint32_t) (iFu)) * (kuiScaleHeight - 1 - fv) >> kuiScaleBitWidth) * b;      x += (((uint32_t) (kuiScaleWidth - 1 - iFu)) * (fv) >> kuiScaleBitWidth) * c;      x += (((uint32_t) (iFu)) * (fv) >> kuiScaleBitWidth) * d;      x >>= (kuiScaleBitHeight - 1);      x += 1;      x >>= 1;      //x = (((__int64)(SCALE_BIG - 1 - iFu))*(SCALE_BIG - 1 - fv)*a + ((__int64)iFu)*(SCALE_BIG - 1 -fv)*b + ((__int64)(SCALE_BIG - 1 -iFu))*fv*c +      //		 ((__int64)iFu)*fv*d + (1 << (2*SCALE_BIT_BIG-1)) ) >> (2*SCALE_BIT_BIG);      x = WELS_CLAMP (x, 0, 255);      *pByDst++ = (uint8_t)x;       iXInverse += fScalex;    }    *pByDst = * (pBySrc + (iXInverse >> kuiScaleBitWidth));    pByLineDst += kiDstStride;    iYInverse += fScaley;  }   // last row special  {    int32_t iYy = iYInverse >> kuiScaleBitHeight;    uint8_t* pBySrc = pSrc + iYy * kiSrcStride;     pByDst = pByLineDst;    iXInverse = 1 << (kuiScaleBitWidth - 1);    for (int32_t j = 0; j < kiDstWidth; j++) {      int32_t iXx = iXInverse >> kuiScaleBitWidth;      *pByDst++ = * (pBySrc + iXx);       iXInverse += fScalex;    }  }} void GeneralBilinearAccurateDownsampler_c (uint8_t* pDst, const int32_t kiDstStride, const int32_t kiDstWidth,    const int32_t kiDstHeight,    uint8_t* pSrc, const int32_t kiSrcStride, const int32_t kiSrcWidth, const int32_t kiSrcHeight) {  const int32_t kiScaleBit = 15;  const int32_t kiScale = (1 << kiScaleBit);  int32_t iScalex = (int32_t) ((float)kiSrcWidth / (float)kiDstWidth * kiScale);  int32_t iScaley = (int32_t) ((float)kiSrcHeight / (float)kiDstHeight * kiScale);  int64_t x;  int32_t iYInverse, iXInverse;   uint8_t* pByDst = pDst;  uint8_t* pByLineDst = pDst;   iYInverse = 1 << (kiScaleBit - 1);  for (int32_t i = 0; i < kiDstHeight - 1; i++) {    int32_t iYy = iYInverse >> kiScaleBit;    int32_t iFv = iYInverse & (kiScale - 1);     uint8_t* pBySrc = pSrc + iYy * kiSrcStride;     pByDst = pByLineDst;    iXInverse = 1 << (kiScaleBit - 1);    for (int32_t j = 0; j < kiDstWidth - 1; j++) {      int32_t iXx = iXInverse >> kiScaleBit;      int32_t iFu = iXInverse & (kiScale - 1);       uint8_t* pByCurrent = pBySrc + iXx;      uint8_t a, b, c, d;       a = *pByCurrent;      b = * (pByCurrent + 1);      c = * (pByCurrent + kiSrcStride);      d = * (pByCurrent + kiSrcStride + 1);       x = (((int64_t) (kiScale - 1 - iFu)) * (kiScale - 1 - iFv) * a + ((int64_t)iFu) * (kiScale - 1 - iFv) * b + ((int64_t) (             kiScale - 1 - iFu)) * iFv * c +           ((int64_t)iFu) * iFv * d + (int64_t) (1 << (2 * kiScaleBit - 1))) >> (2 * kiScaleBit);      x = WELS_CLAMP (x, 0, 255);      *pByDst++ = (uint8_t)x;       iXInverse += iScalex;    }    *pByDst = * (pBySrc + (iXInverse >> kiScaleBit));    pByLineDst += kiDstStride;    iYInverse += iScaley;  }   // last row special  {    int32_t iYy = iYInverse >> kiScaleBit;    uint8_t* pBySrc = pSrc + iYy * kiSrcStride;     pByDst = pByLineDst;    iXInverse = 1 << (kiScaleBit - 1);    for (int32_t j = 0; j < kiDstWidth; j++) {      int32_t iXx = iXInverse >> kiScaleBit;      *pByDst++ = * (pBySrc + iXx);       iXInverse += iScalex;    }  }}  #ifdef X86_ASM//void GeneralBilinearFastDownsamplerWrap_sse2 (uint8_t* pDst, const int32_t kiDstStride, const int32_t kiDstWidth,//    const int32_t kiDstHeight,//    uint8_t* pSrc, const int32_t kiSrcStride, const int32_t kiSrcWidth, const int32_t kiSrcHeight) {//  const int32_t kiScaleBitWidth = 16, kiScaleBitHeight = 15;//  const uint32_t kuiScaleWidth = (1 << kiScaleBitWidth), kuiScaleHeight = (1 << kiScaleBitHeight);////  uint32_t uiScalex = (uint32_t) ((float)kiSrcWidth / (float)kiDstWidth * kuiScaleWidth);//  uint32_t uiScaley = (uint32_t) ((float)kiSrcHeight / (float)kiDstHeight * kuiScaleHeight);////  GeneralBilinearFastDownsampler_sse2 (pDst, kiDstStride, kiDstWidth, kiDstHeight,//                                       pSrc, kiSrcStride, kiSrcWidth, kiSrcHeight, uiScalex, uiScaley);//}////void GeneralBilinearAccurateDownsamplerWrap_sse2 (uint8_t* pDst, const int32_t kiDstStride, const int32_t kiDstWidth,//    const int32_t kiDstHeight,//    uint8_t* pSrc, const int32_t kiSrcStride, const int32_t kiSrcWidth, const int32_t kiSrcHeight) {//  const int32_t kiScaleBit = 15;//  const uint32_t kuiScale = (1 << kiScaleBit);////  uint32_t uiScalex = (uint32_t) ((float)kiSrcWidth / (float)kiDstWidth * kuiScale);//  uint32_t uiScaley = (uint32_t) ((float)kiSrcHeight / (float)kiDstHeight * kuiScale);////  GeneralBilinearAccurateDownsampler_sse2 (pDst, kiDstStride, kiDstWidth, kiDstHeight,//      pSrc, kiSrcStride, kiSrcWidth, kiSrcHeight, uiScalex, uiScaley);//}#endif //X86_ASM #ifdef HAVE_NEONvoid GeneralBilinearAccurateDownsamplerWrap_neon (uint8_t* pDst, const int32_t kiDstStride, const int32_t kiDstWidth,    const int32_t kiDstHeight,    uint8_t* pSrc, const int32_t kiSrcStride, const int32_t kiSrcWidth, const int32_t kiSrcHeight) {  const int32_t kiScaleBit = 15;  const uint32_t kuiScale = (1 << kiScaleBit);  uint32_t uiScalex = (uint32_t) ((float)kiSrcWidth / (float)kiDstWidth * kuiScale);  uint32_t uiScaley = (uint32_t) ((float)kiSrcHeight / (float)kiDstHeight * kuiScale);  GeneralBilinearAccurateDownsampler_neon (pDst, kiDstStride, kiDstWidth, kiDstHeight, pSrc, kiSrcStride, uiScalex,      uiScaley);}#endifWELSVP_NAMESPACE_END