// libimageproc.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "libimageproc.h"
#include "highgui.h"
#include "cv.h"
#include "resource.h"
#include "atlcore.h"

static HINSTANCE g_module = NULL;

// 这是导出函数的一个示例。
LIBIMAGEPROC_API bool imageprocess(char*BackImgPath,char*FrontImgPath,char*ResultImgPath)
{	
	IplImage *pBK = cvCreateImage(cvSize(324,202),IPL_DEPTH_8U,3);
	HBITMAP hBitmap = (HBITMAP)LoadImageA(g_module, 
		MAKEINTRESOURCEA(IDB_BK), 
		IMAGE_BITMAP, 
		0, 
		0, 
		LR_CREATEDIBSECTION|LR_DEFAULTSIZE);
	if (hBitmap) 
	{
		LONG cb = 324 * 202 * 3;
		GetBitmapBits(hBitmap, cb, pBK->imageData);
		DeleteObject(hBitmap);
	}
	IplImage *pfront	= cvLoadImage(FrontImgPath,1);
	if (pBK == NULL || pfront == NULL)
		return false;
	IplImage *pImg		= cvCreateImage(cvSize(pfront->width,pfront->height),IPL_DEPTH_8U,1);
	int j,i;
	CvMat bk;
	cvGetSubRect(pBK,&bk,cvRect(200,30,pfront->width,pfront->height));
	cvCvtColor(pfront,pImg,CV_RGB2GRAY); //rgb转换为灰度图
	for(j = 0;j< pImg->height ; j++)
	{
		uchar* ptr = (uchar*)(pImg->imageData+j*pImg->widthStep);
		uchar* ptr1 = (uchar*)(pfront->imageData+j*pfront->widthStep);
		uchar* ptr2 = (uchar*)(bk.data.ptr+j*bk.step);
		for(i = 0;i < pImg->width ; i++)
		{
			if(ptr[i] < 220)  //像素值小于220的保留下来 并显示到背景图上 即白色部分被去除 
			{
				ptr2[i*3] = ptr1[i*3];
				ptr2[i*3 + 1] = ptr1[i*3 + 1];
				ptr2[i*3 + 2] = ptr1[i*3 + 2];
			}
		}
	}
	cvSaveImage(ResultImgPath,pBK);
	cvReleaseImage( &pBK);
	cvReleaseImage( &pfront);
	cvReleaseImage( &pImg);
	return true;
}

BOOL APIENTRY DllMain( HINSTANCE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		g_module = hModule;
		DisableThreadLibraryCalls(hModule);
		break;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}

	return TRUE;
}