burns的直线检测去ipp化

看到http://blog.youkuaiyun.com/ihadl/article/details/12993505贴出burns的算法，写的不错。

由于以前用过该算法，并做了移植，去掉了ipp部分，这里贴出部分移植代码，供参考。

burns.h：

//#define IPP

#ifdef IPP

#include "ipp.h"

#else

typedef unsigned char   Ipp8u;
typedef unsigned short  Ipp16u;

typedef signed char    Ipp8s;
typedef signed short   Ipp16s;

#define IPP_PI180 ( 0.01745329251994329577 )  // pi/180

typedef struct {
    int width;
    int height;
} IppiSize;

typedef enum  _IppiMaskSize {
    ippMskSize1x3 = 13,
		ippMskSize1x5 = 15,
		ippMskSize3x1 = 31,
		ippMskSize3x3 = 33,
		ippMskSize5x1 = 51,
		ippMskSize5x5 = 55
} IppiMaskSize;

#endif

burns.c：

#ifndef IPP
//
//my ipp function
Ipp8u *ippiMalloc_8u_C1( int widthPixels, int heightPixels, int* pStepBytes)
{
//	*pStepBytes = widthPixels;
	*pStepBytes = (widthPixels * sizeof(Ipp8u) + 31) / 32 * 32;
	Ipp8u *pixel = (Ipp8u*)calloc(*pStepBytes * heightPixels, 1);

	return pixel;
}

Ipp16s *ippiMalloc_16s_C1( int widthPixels, int heightPixels, int* pStepBytes)
{
//	*pStepBytes = widthPixels;
	*pStepBytes = (widthPixels * sizeof(Ipp16s) + 31) / 32 * 32;
	Ipp16s *pixel = (Ipp16s*)calloc(*pStepBytes * heightPixels, 1);
	
	return pixel;
}

void ippiFree(void* ptr)
{
	if (ptr)
		free(ptr);
}

void ippiFilterSobelHoriz_8u16s_C1R(const Ipp8u* pSrc, int srcStep, Ipp16s* pDst, int dstStep, IppiSize roiSize, IppiMaskSize mask)
{
	if (mask == ippMskSize3x3)
	{
		static const int sizeOfSobelMask = 9;
		static int sobelMaskHor[sizeOfSobelMask] = 
		{
			-1, -2, -1, 
				0,  0,  0,
				1,  2,  1
		};
		
		dstStep /= sizeof(Ipp16s);

		short ts = 0, tmp = 0, idx = 0;
	
		for (int y = 1; y < roiSize.height - 1; ++ y)
		{
			for (int x = 1; x < roiSize.width - 1; ++x)
			{
				idx = ts = 0;
				for(int r = y - 1; r <= y + 1; ++r)
				{
					for(int c = x - 1; c <= x + 1; ++c)
					{
						tmp = pSrc[r * srcStep + c];
//						tmp = pSrc[r * roiSize.width + c];
						ts += (sobelMaskHor[idx] * tmp );
						++idx;
					}
				}
//				pDst[y * roiSize.width + x] = ts;
				pDst[y * dstStep + x] = ts;
			}
		}
	}
}

void ippiFilterSobelVert_8u16s_C1R(const Ipp8u* pSrc, int srcStep, Ipp16s* pDst, int dstStep, IppiSize roiSize, IppiMaskSize mask)
{
	if (mask == ippMskSize3x3)
	{
		static const int sizeOfSobelMask = 9;
		static int SobelMaskVer[sizeOfSobelMask] = 
		{
			-1, 0, 1,
				-2, 0, 2,
				-1, 0, 1
		};
		
		dstStep /= sizeof(Ipp16s);
		
// 		memset(pDst, 0, dstStep*sizeof(Ipp16s));
// 		memset(pDst+(roiSize.height-1)*dstStep, 0, dstStep*sizeof(Ipp16s));
// 		Ipp16s *p = pDst;
// 		for (int i = 0; i < roiSize.height; i++)
// 		{
// 			p[i] = 0;
// 			p[roiSize.width-1] = 0;
// 			p += dstStep;
// 		}

		short tv = 0, tmp = 0, idx = 0;
		
		for (int y = 1; y < roiSize.height - 1; ++ y)
		{	
			for (int x = 1; x < roiSize.width - 1; ++x)
			{
				idx = tv = 0;
				for(int r = y - 1; r <= y + 1; ++r)
				{
					for(int c = x - 1; c <= x + 1; ++c)
					{
						tmp = pSrc[r * srcStep + c];
//						tmp = pSrc[r * roiSize.width + c];
						tv += (SobelMaskVer[idx] * tmp );
						++idx;
					}
				}
//				pDst[y * roiSize.width + x] = tv;
				pDst[y * dstStep + x] = tv;
			}
		}
	}
}

void ippiSet_8u_C1R(Ipp8u value, Ipp8u* pDst, int dstStep, IppiSize roiSize)
{
	int x, y;
	Ipp8u* p = pDst;
	for (y = 0; y < roiSize.height; ++y)
	{
		for (x = 0; x < roiSize.width; ++x)
		{
			pDst[y * dstStep + x] = value;
//			*p++ = value;
		}
	}
}
#endif