ref: 99faf1ec4a47c5362a6bde552d6097166e2fda16
dir: /processing/src/downsample/downsamplefuncs.cpp/
/*!
* \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 "../common/typedef.h"
#include "../common/util.h"
#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_t)kiSrcWidth / (float_t)kiDstWidth * kuiScaleWidth);
int32_t fScaley = (int32_t)((float_t)kiSrcHeight / (float_t)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_t)kiSrcWidth / (float_t)kiDstWidth * kiScale);
int32_t iScaley = (int32_t)((float_t)kiSrcHeight / (float_t)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_t)kiSrcWidth / (float_t)kiDstWidth * kuiScaleWidth);
uint32_t uiScaley = (uint32_t)((float_t)kiSrcHeight / (float_t)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_t)kiSrcWidth / (float_t)kiDstWidth * kuiScale);
uint32_t uiScaley = (uint32_t)((float_t)kiSrcHeight / (float_t)kiDstHeight * kuiScale);
GeneralBilinearAccurateDownsampler_sse2(pDst, kiDstStride, kiDstWidth, kiDstHeight,
pSrc, kiSrcStride, kiSrcWidth, kiSrcHeight, uiScalex, uiScaley);
}
#endif //X86_ASM
WELSVP_NAMESPACE_END