javascript 人工智能 opencv之坑（八）——putText中文乱码解决

opencv4.0之前版本和部分4.0版本的putText仅支持英文，如果中文会乱码，可以用下面方法构造函数解决： 头文件如下：

#pragma once

#ifndef PUTTEXT_H_

#define PUTTEXT_H_

#include

#include

#include

using namespace cv;

void GetStringSize(HDC hDC, const char* str, int* w, int* h);

void putTextHusky(Mat &dst, const char* str, Point org, Scalar color, int fontSize,

const char *fn = "Arial", bool italic = false, bool underline = false);

#endif // PUTTEXT_H_

源文件如下：

#include "putText.h"

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;

}

void putTextHusky(Mat &dst, const char* str, Point org, Scalar color, int fontSize, const char* fn, bool italic, bool underline)//后俩参数：斜体，下划线

{

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);

}

之后调用putTextHusky就行

好文链接