OpenCV实现图像上添加汉字 转

<span style="font-size:18px;">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 paDrawString(Mat& dst, const char* str, Point org, Scalar color, int fontSize, 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 (lf.lfFaceName, "华文行楷" );

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(buf, str);

//处理多行
{
int nnh = 0;
int cw, ch;
const char* ln = strtok(buf, "\n");
while(ln != 0)
{
GetStringSize(hDC, ln, &cw, &ch);
strBaseW = max(strBaseW, cw);
strBaseH = max(strBaseH, ch);

ln = strtok(0, "\n");
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(buf, str);
const char* ln = strtok(buf, "\n");
int outTextY = 0;
while(ln != 0)
{
TextOutA(hDC, 0, outTextY, ln, strlen(ln));
outTextY += singleRow;
ln = strtok(0, "\n");
}
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
/ 255.0;
int cvv =  vtxt * color.val
+ (1 - vtxt) * subImg
;
subImg
= cvv > 255 ? 255 : (cvv < 0 ? 0 : cvv);
}

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

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

void main()
{
Mat img = imread("cat.jpg");
if(!img.data)
{
cout<<"load image error"<<endl;
return;
}
paDrawString(img, "测试汉字哈...\n换行了哟\n真的可以啊！！！~",Point(10, 10), Scalar(255,0,0), 50, true, true);
imshow("img", img);
waitKey();
}