capturer

Screen capture and available sources.

• Kind: module (.owm), optional
• Version: 0.1.0
• Platforms: Linux (X11), Windows

v1 limitation: on Linux capture works on X11 only. Under Wayland the functions return a clear capture is only supported on an X11 session error (an xdg-desktop-portal backend is planned).

Functions

getSources

Returns one entry per monitor:

{
  type: 'screen',
  id: number,
  name: string,
  bounds: { x, y, width, height },
  thumbnail: { id: string, size: number }   // PNG in shared memory
}[]

Each thumbnail is a shared-memory handle; read it with ow.readShared.

captureScreen

Captures a full-resolution PNG of a monitor (default index 0):

const shot = await ow.invoke<any>('capturer', 'captureScreen', 0)
const png = await ow.readShared(shot.__ow_shm)   // ArrayBuffer
console.log(shot.width, shot.height, shot.format) // 'png'

Implementation notes

• X11: XGetImage on the root window, converted to a GdkPixbuf and encoded as PNG.
• The module is marked optional.
• Windows (BitBlt) is the intended backend; verify in CI.

See also

• Screen and power guide
• screen