Simple games that do not require fast graphics rendering use GDI. This capability is at the center of all What You See Is What You Get applications for Microsoft Windows. Using GDI, it is very easy to draw on multiple devices, such as a screen and a printer, and expect proper reproduction in each case. Perhaps the most significant capability of GDI over more direct methods of accessing the hardware are its scaling capabilities, and its abstract representation of target devices. Other systems have components that are similar to GDI, for example Macintosh's Quartz (originally QuickDraw) and GTK's GDK/ Xlib. that task is reserved for the user subsystem, which resides in user32.dll and is built atop GDI. It is not directly responsible for drawing windows, menus, etc. GDI is responsible for tasks such as drawing lines and curves, rendering fonts and handling palettes. The Graphics Device Interface (GDI) is a Microsoft Windows application programming interface and core operating system component responsible for representing graphical objects and transmitting them to output devices such as monitors and printers.
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