OpenCV：OpenCV cvPutText()显示中文

文章链接：OpenCV显示中文，不使用CvxText和FreeType库；

C++代码：

//OpenCv支持中文
namespace cvzh {
	using namespace cv;
	void GetStringSize(HDC hDC, const char* str, int* w, int* h) 
	{
		SIZE size;
		GetTextExtentPoint32A(hDC, str, strlen(str), &size);
		if (w != 0) *w = size.cx;
		if (h != 0) *h = size.cy;
	}

	////const char *fn = "Arial", bool italic = false, bool underline = false) 
	void putTextZH( Mat &dst, const char* str, Point org, Scalar color, int fontSize, const char *fn , bool italic, bool underline)
	{
		CV_Assert(dst.data != 0 && (dst.channels() == 1 || dst.channels() == 3));

		int x, y, r, b;
		if (org.x > dst.cols || org.y > dst.rows) return;
		x = org.x < 0 ? -org.x : 0;
		y = org.y < 0 ? -org.y : 0;

		LOGFONTA lf;
		lf.lfHeight = -fontSize;
		lf.lfWidth = 0;
		lf.lfEscapement = 0;
		lf.lfOrientation = 0;
		lf.lfWeight = 5;
		lf.lfItalic = italic;   //斜体
		lf.lfUnderline = underline; //下划线
		lf.lfStrikeOut = 0;
		lf.lfCharSet = DEFAULT_CHARSET;
		lf.lfOutPrecision = 0;
		lf.lfClipPrecision = 0;
		lf.lfQuality = PROOF_QUALITY;
		lf.lfPitchAndFamily = 0;
		strcpy_s(lf.lfFaceName, fn);

		HFONT hf = CreateFontIndirectA(&lf);
		HDC hDC = CreateCompatibleDC(0);
		HFONT hOldFont = (HFONT)SelectObject(hDC, hf);

		int strBaseW = 0, strBaseH = 0;
		int singleRow = 0;
		char buf[1 << 12];
		strcpy_s(buf, str);
		char *bufT[1 << 12];  // 这个用于分隔字符串后剩余的字符，可能会超出。
							  //处理多行
		{
			int nnh = 0;
			int cw, ch;

			const char* ln = strtok_s(buf, "\n", bufT);
			while (ln != 0)
			{
				GetStringSize(hDC, ln, &cw, &ch);
				strBaseW = max(strBaseW, cw);
				strBaseH = max(strBaseH, ch);

				ln = strtok_s(0, "\n", bufT);
				nnh++;
			}
			singleRow = strBaseH;
			strBaseH *= nnh;
		}

		if (org.x + strBaseW < 0 || org.y + strBaseH < 0)
		{
			SelectObject(hDC, hOldFont);
			DeleteObject(hf);
			DeleteObject(hDC);
			return;
		}

		r = org.x + strBaseW > dst.cols ? dst.cols - org.x - 1 : strBaseW - 1;
		b = org.y + strBaseH > dst.rows ? dst.rows - org.y - 1 : strBaseH - 1;
		org.x = org.x < 0 ? 0 : org.x;
		org.y = org.y < 0 ? 0 : org.y;

		BITMAPINFO bmp = { 0 };
		BITMAPINFOHEADER& bih = bmp.bmiHeader;
		int strDrawLineStep = strBaseW * 3 % 4 == 0 ? strBaseW * 3 : (strBaseW * 3 + 4 - ((strBaseW * 3) % 4));

		bih.biSize = sizeof(BITMAPINFOHEADER);
		bih.biWidth = strBaseW;
		bih.biHeight = strBaseH;
		bih.biPlanes = 1;
		bih.biBitCount = 24;
		bih.biCompression = BI_RGB;
		bih.biSizeImage = strBaseH * strDrawLineStep;
		bih.biClrUsed = 0;
		bih.biClrImportant = 0;

		void* pDibData = 0;
		HBITMAP hBmp = CreateDIBSection(hDC, &bmp, DIB_RGB_COLORS, &pDibData, 0, 0);

		CV_Assert(pDibData != 0);
		HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);

		//color.val[2], color.val[1], color.val[0]
		SetTextColor(hDC, RGB(255, 255, 255));
		SetBkColor(hDC, 0);
		//SetStretchBltMode(hDC, COLORONCOLOR);

		strcpy_s(buf, str);
		const char* ln = strtok_s(buf, "\n", bufT);
		int outTextY = 0;
		while (ln != 0)
		{
			TextOutA(hDC, 0, outTextY, ln, strlen(ln));
			outTextY += singleRow;
			ln = strtok_s(0, "\n", bufT);
		}
		uchar* dstData = (uchar*)dst.data;
		int dstStep = dst.step / sizeof(dstData[0]);
		unsigned char* pImg = (unsigned char*)dst.data + org.x * dst.channels() + org.y * dstStep;
		unsigned char* pStr = (unsigned char*)pDibData + x * 3;
		for (int tty = y; tty <= b; ++tty)
		{
			unsigned char* subImg = pImg + (tty - y) * dstStep;
			unsigned char* subStr = pStr + (strBaseH - tty - 1) * strDrawLineStep;
			for (int ttx = x; ttx <= r; ++ttx)
			{
				for (int n = 0; n < dst.channels(); ++n) {
					double vtxt = subStr[n] / 255.0;
					int cvv = vtxt * color.val[n] + (1 - vtxt) * subImg[n];
					subImg[n] = cvv > 255 ? 255 : (cvv < 0 ? 0 : cvv);
				}

				subStr += 3;
				subImg += dst.channels();
			}
		}

		SelectObject(hDC, hOldBmp);
		SelectObject(hDC, hOldFont);
		DeleteObject(hf);
		DeleteObject(hBmp);
		DeleteDC(hDC);
	}


}

//OpenCv支持中文
namespace cvzh {
    using namespace cv;
    void GetStringSize(HDC hDC, const char* str, int* w, int* h);
    void putTextZH(Mat &dst, const char* str, Point org, Scalar color, int fontSize,
        const char *fn = "Arial", bool italic = false, bool underline = false);
}

效果：