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imgproc: fix trailingZeros for MSVS 2010

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This commit is contained in:
Alexander Alekhin 2016-11-08 15:44:52 +03:00
parent 442380bfac
commit 183c75358b
1 changed files with 8 additions and 2 deletions
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10
modules/imgproc/src/contours.cpp
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@ -50,10 +50,15 @@
static const CvPoint icvCodeDeltas[8] =
{ CvPoint(1, 0), CvPoint(1, -1), CvPoint(0, -1), CvPoint(-1, -1), CvPoint(-1, 0), CvPoint(-1, 1), CvPoint(0, 1), CvPoint(1, 1) };
#if CV_SSE2
static
inline unsigned int trailingZeros(unsigned int value) {
CV_DbgAssert(value != 0); // undefined for zero input (https://en.wikipedia.org/wiki/Find_first_set)
#if defined(_MSC_VER)
#if (_MSC_VER < 1500)
return _BitScanForward(value);
#if (_MSC_VER < 1700)
unsigned long index = 0;
_BitScanForward(&index, value);
return (unsigned int)index;
#else
return _tzcnt_u32(value);
#endif
@ -70,6 +75,7 @@ inline unsigned int trailingZeros(unsigned int value) {
return MultiplyDeBruijnBitPosition[((uint32_t)((value & -value) * 0x077CB531U)) >> 27];
#endif
}
#endif
CV_IMPL void
cvStartReadChainPoints( CvChain * chain, CvChainPtReader * reader )