QImage和opencv相互转化

#include "CvxQtWrap.h"
#include 

IplImage *cvxCopyQImage(const QImage &qImage, IplImage **ppIplImage)
{
	if(qImage.isNull()) return NULL;

	// 图像大小
	
	int w = qImage.width();
	int h = qImage.height();

	// 创建IplImage

	IplImage *pIplImage = (!ppIplImage || !CV_IS_IMAGE(*ppIplImage))?
		cvCreateImage(cvSize(w,h), IPL_DEPTH_8U, 3): (*ppIplImage);
	if(!CV_IS_IMAGE(pIplImage)) return NULL;

	// 调整大小

	if(pIplImage->width != w || pIplImage->height != h)
	{
		// 需要修改pIplImage指针

		cvReleaseImage(&pIplImage);
		pIplImage = cvCreateImage(cvSize(w,h), IPL_DEPTH_8U, 3);

		if(!CV_IS_IMAGE(pIplImage)) 
		{
			if(!ppIplImage) (*ppIplImage) = NULL;
			return NULL;
		}
	}

	// 设置左上角起点

	pIplImage->origin = IPL_ORIGIN_TL;

	// 复制像素
	
	int x, y;
	for(x = 0; x < pIplImage->width; ++x)
	{
		for(y = 0; y < pIplImage->height; ++y)
		{
			QRgb rgb = qImage.pixel(x, y);

			// 灰度/彩色

			if(pIplImage->nChannels == 1)
			{
				cvSet2D(pIplImage, y, x, CV_RGB(qGray(rgb), 0, 0));
			}
			else
			{
				cvSet2D(pIplImage, y, x, CV_RGB(qRed(rgb), qGreen(rgb), qBlue(rgb)));
			}
		}
	}

	// 更新(*ppIplImage)

	if(!ppIplImage) (*ppIplImage) = NULL;
	return pIplImage;
}

QImage& cvxCopyIplImage(const IplImage *pIplImage, QImage &qImage)
{
	if(!CV_IS_IMAGE(pIplImage)) return qImage;

	// 图像大小

	int w = pIplImage->width;
	int h = pIplImage->height;

	// 调整qImage的大小

	if(qImage.width() != w || qImage.height() != h)
	{
		qImage = QImage(w, h, QImage::Format_RGB32);
	}

	// 复制像素
	
	int x, y;
	for(x = 0; x < pIplImage->width; ++x)
	{
		for(y = 0; y < pIplImage->height; ++y)
		{
			CvScalar color = cvGet2D(pIplImage, y, x);

			// 灰度/彩色

			if(pIplImage->nChannels == 1)
			{
				int v = color.val[0];
				
				qImage.setPixel(x, y, qRgb(v,v,v));
			}
			else
			{
				int r = color.val[2];
				int g = color.val[1];
				int b = color.val[0];
				
				qImage.setPixel(x, y, qRgb(r,g,b));
			}
		}
	}

	// 上下翻转

	if(pIplImage->origin != IPL_ORIGIN_TL)
	{
		qImage = qImage.mirrored(false, true);
	}

	return qImage;
}