Write text on BITMAPINFO in memory

问题

I retrieve a frame from a .avi video as BITMAPINFO and I want to write a string on it, and I dont want to use OpenCV.I could write a library which manually changes the pixel color from the image , to form letters, but it would take a lot of time. The image is 32 bits RGBA

pbmi = (BITMAPINFO*)AVIStreamGetFrame(pgf, i);
BYTE *pPixelSrc = (sizeof(BITMAPINFO) + (BYTE*)pbmi);
long width,height;
width = *((long*)(((BYTE*)pbmi)+4));
height = *((long*)(((BYTE*)pbmi)+8));
//Draw string on data pPixelSrc

回答1:

Use the GDI function, or Gdiplus, to draw text with DrawText or TextOut. The bitmap could be upside down, it may have to be flipped. Check the sign for height

int width = pbmi->bmiHeader.biWidth;
int height = pbmi->bmiHeader.biHeight;

auto hdc = GetDC(0);
auto memdc = CreateCompatibleDC(hdc);
auto hbitmap = CreateBitmap(width, height, 1, 32, pPixelSrc);
auto oldbmp = SelectObject(memdc, hbitmap);

TextOut(memdc, 0, 0, "123", 3);

SelectObject(memdc, oldbmp);
GetDIBits(memdc, hbitmap, 0, height, pPixelSrc, pbmi, 0);

DeleteObject(hbitmap);
DeleteDC(memdc);
ReleaseDC(0, hdc);

来源：https://stackoverflow.com/questions/51725207/write-text-on-bitmapinfo-in-memory