---
name: "display-sub"
section: "7ggi"
platform: "linux"
package: "libggi2"
version: "1:2.0.1-2"
release: "Debian 3.0 (Woody)"
platforms: ["linux"]
url: "https://new.carta.tech/display-sub/7ggi"
---

# display-sub(7ggi)

Make a child visual that is a window to the parent

## NAME

display-sub - Make a child visual that is a window to the parent

## DESCRIPTION

Creates a \`child' visual within a "parent". This can be thought of as a window and the **sub** target is intended for simple windowing systems.

No textual arguments. *argptr* must contain the parent visual.

The sub target behaves a bit special with respect to (i.e. abuses the semantics of :) the **ggiSetMode** call. It uses the "visible" size for the top left corner position of the window within the visual, and the "virtual" size for window width and height. Note, that moving/resizing the window does **not** cause any drawing action. You have to perform those yourself. All it does for you is providing a virtual visual within an existing one, which is convenient to allow for window system canvases to be about any GGI program.

## FEATURES

DirectBuffer not supported.

Accelerated to the point of the parent. Calls are mapped through with modified clipping and coordinates.