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added SSE2-optimized resizeAreaFast for 8-bit images by Grigoriy Frolov

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Vadim Pisarevsky 2012-08-21 23:00:50 +04:00
parent a840d929ac
commit 64661ea9cd
1 changed files with 117 additions and 0 deletions
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117
modules/imgproc/src/imgwarp.cpp
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@ -1328,6 +1328,123 @@ static void resizeArea_( const Mat& src, Mat& dst, const DecimateAlpha* xofs, in
}
}
}
template <> static void
resizeAreaFast_<uchar, int>( const Mat& src, Mat& dst, const int* ofs, const int* xofs,
int scale_x, int scale_y )
{
#if CV_SSE2
bool haveSSE2 = checkHardwareSupport(CV_CPU_SSE2);
#endif
Size ssize = src.size(), dsize = dst.size();
int cn = src.channels();
int dy, dx, k = 0;
int area = scale_x*scale_y;
float scale = 1.f/(scale_x*scale_y);
int dwidth1 = (ssize.width/scale_x)*cn;
dsize.width *= cn;
ssize.width *= cn;
//avg values
for( dy = 0; dy < dsize.height; dy++ )
{
uchar* D = (uchar*)(dst.data + dst.step*dy);
int sy0 = dy*scale_y, w = sy0 + scale_y <= ssize.height ? dwidth1 : 0;
if( sy0 >= ssize.height )
{
for( dx = 0; dx < dsize.width; dx++ ) //memset(D,0, dsize.width);//warning, never executed -> not tested
D[dx] = 0;
continue;
}
dx = 0;
#if CV_SSE2
if( haveSSE2 )
{
const __m128 _scale = _mm_set1_ps(scale);
const __m128i _ucMAXs = _mm_set1_epi16(UCHAR_MAX);
const uchar* _S[8];
for(; dx < w-8; dx+=8 )
{
__m128i _sum = _mm_setzero_si128();
__m128i _sum1 = _mm_setzero_si128();
_S[0] = (const uchar*)(src.data + src.step*sy0) + xofs[dx];
_S[1] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+1];
_S[2] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+2];
_S[3] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+3];
_S[4] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+4];
_S[5] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+5];
_S[6] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+6];
_S[7] = (const uchar*)(src.data + src.step*sy0) + xofs[dx+7];
for( k = 0; k < area; k++ )
{
int ofsk = ofs[k];
__m128i _temp = _mm_set_epi32(_S[3][ofsk],_S[2][ofsk],_S[1][ofsk],_S[0][ofsk]);
_sum = _mm_add_epi32(_sum, _temp);
__m128i _temp1 = _mm_set_epi32(_S[7][ofsk],_S[6][ofsk],_S[5][ofsk],_S[4][ofsk]);
_sum1 = _mm_add_epi32(_sum1, _temp1);
}
__m128i _tempSum = _mm_cvtps_epi32(_mm_mul_ps(_mm_cvtepi32_ps(_sum), _scale));
__m128i _tempSum1 = _mm_cvtps_epi32(_mm_mul_ps(_mm_cvtepi32_ps(_sum1), _scale));
_tempSum = _mm_packs_epi32(_tempSum, _tempSum1);
_tempSum = _mm_min_epi16(_ucMAXs, _tempSum);
_tempSum = _mm_packus_epi16(_tempSum, _tempSum);
_mm_storel_epi64((__m128i*)(D+dx),_tempSum);
}
}
#endif
for(; dx < w; dx++ )
{
const uchar* S = (const uchar*)(src.data + src.step*sy0) + xofs[dx];
int sum = 0;
k=0;
#if CV_ENABLE_UNROLLED
for( ; k <= area - 4; k += 4 )
sum += S[ofs[k]] + S[ofs[k+1]] + S[ofs[k+2]] + S[ofs[k+3]];
#endif
for( ; k < area; k++ )
sum += S[ofs[k]];
D[dx] = saturate_cast<uchar>(sum*scale);
}
for( ; dx < dsize.width; dx++ )
{
int sum = 0;
int count = 0, sx0 = xofs[dx];
if( sx0 >= ssize.width )
D[dx] = 0;
for( int sy = 0; sy < scale_y; sy++ )
{
if( sy0 + sy >= ssize.height )
break;
const uchar* S = (const uchar*)(src.data + src.step*(sy0 + sy)) + sx0;
int sx = 0;
for( ; sx < scale_x*cn; sx += cn )
{
if( sx0 + sx >= ssize.width )
break;
sum += S[sx];
count++;
}
}
D[dx] = saturate_cast<uchar>((float)sum/count);
}
}
}
typedef void (*ResizeFunc)( const Mat& src, Mat& dst,