OpenCV顯示中文漢字，未使用CvxText和FreeType庫

采用windows的GDI顯示系統的TrueType字體，沒有封裝，就兩個函數，分成了h和cpp文件，可以自己編輯文件名和函數名，亦可以直接將cpp的代碼復制到你需要的程序中。

• putText.h
• putText.cpp
• 演示

文件putText.h

后面的cpp文件有一些簡要說明。

#ifndef PUTTEXT_H_

#define PUTTEXT_H_

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#include <windows.h>

#include <string>

#include <opencv2/opencv.hpp>

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using namespace cv;

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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);

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#endif // PUTTEXT_H_

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putText.cpp

第二個函數putTextZH()，默認使用Arial字體，也可以設置成操作系統中已經安裝的字體，如“宋體”、“微軟雅黑”、“Times New Roman”等；默認顯示非斜體、非下劃線。

#include "putText.h"

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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;

}

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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));

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??? 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;

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??? LOGFONTA lf;

??? lf.lfHeight = -fontSize;

??? lf.lfWidth = 0;

??? lf.lfEscapement = 0;

??? lf.lfOrientation = 0;

??? lf.lfWeight = 5;

??? lf.lfItalic = italic;?? //斜體

??? lf.lfUnderline = underline; //下劃線

??? 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);

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??? HFONT hf = CreateFontIndirectA(&lf);

??? HDC hDC = CreateCompatibleDC(0);

??? HFONT hOldFont = (HFONT)SelectObject(hDC, hf);

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??? int strBaseW = 0, strBaseH = 0;

??? int singleRow = 0;

??? char buf[1 << 12];

??? strcpy_s(buf, str);

??? char *bufT[1 << 12];? // 這個用于分隔字符串后剩余的字符，可能會超出。

??????????????????????? ? //處理多行

??? {

??????? int nnh = 0;

??????? int cw, ch;

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??????? const char* ln = strtok_s(buf, "\n", bufT);

??????? while (ln != 0)

??????? {

??????????? GetStringSize(hDC, ln, &cw, &ch);

??????????? strBaseW = max(strBaseW, cw);

??????????? strBaseH = max(strBaseH, ch);

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??????????? ln = strtok_s(0, "\n", bufT);

??????????? nnh++;

??????? }

??????? singleRow = strBaseH;

??????? strBaseH *= nnh;

??? }

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??? if (org.x + strBaseW < 0 || org.y + strBaseH < 0)

??? {

??????? SelectObject(hDC, hOldFont);

??????? DeleteObject(hf);

??????? DeleteObject(hDC);

??????? return;

??? }

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??? 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;

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??? BITMAPINFO bmp = { 0 };

??? BITMAPINFOHEADER& bih = bmp.bmiHeader;

??? int strDrawLineStep = strBaseW * 3 % 4 == 0 ? strBaseW * 3 : (strBaseW * 3 + 4 - ((strBaseW * 3) % 4));

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??? 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;

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??? void* pDibData = 0;

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

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??? CV_Assert(pDibData != 0);

??? HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);

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??? //color.val[2], color.val[1], color.val[0]

??? SetTextColor(hDC, RGB(255, 255, 255));

??? SetBkColor(hDC, 0);

??? //SetStretchBltMode(hDC, COLORONCOLOR);

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??? 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);

??????????? }

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??????????? subStr += 3;

??????????? subImg += dst.channels();

??????? }

??? }

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??? SelectObject(hDC, hOldBmp);

??? SelectObject(hDC, hOldFont);

??? DeleteObject(hf);

??? DeleteObject(hBmp);

??? DeleteDC(hDC);

}

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演示

讀取一個圖片加入字體，顯示。

#include "opencv2/opencv.hpp"

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#include "putText.h"

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using namespace std;

using namespace cv;

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int main()

{

??? Mat img = imread("1000.jpg");

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??? putTextZH(img, "Arial字體換...\n行顯示!", Point(50, 50), Scalar(0, 0, 255), 30, "Arial");

??? putTextZH(img, "微軟雅黑字體換...\n行，斜體，下劃線，顯示!", Point(50, 100), Scalar(0, 255, 0), 30, "微軟雅黑", true, true);

??? putTextZH(img, "楷體字體換...\n行，斜體，下劃線，顯示!", Point(50, 200), Scalar(128, 255, 0), 30, "楷體", true, true);

??? putTextZH(img, "梁朝偉", Point(500, 500), Scalar(0, 0, 255), 30, "楷體", false, false);

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??? imshow("test", img);

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??? waitKey();

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??? return 0;

}

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