Graphics Device Interface

Component of Windows to create Raster images like:

• Bitmap
• PNG
• Fonts
• Vector graphics For printing, it will convert all it sees as input including fonts into Bitmap images before sending it to the printer.

In Win32 API, it can be used to draw images to the screen. https://zetcode.com/gui/winapi/gdi/

Graphics Process

1. Create a painstruct PAINTSTRUCT ps;
2. Obtain a HDC using BeginPaint HDC hdc = BeginPaint(hWnd, &ps); This prepares a window and a paintstruct for painting
3. You can either:
   1. Draw pixels with SetPixel()
   2. Draw a bitmap with BitBlt()
4. Close the HDC with EndPaint BOOL _ = EndPaint(hWnd, &ps);