GdkPixbuf* gdk_pixbuf_get_from_window ( GdkWindow* window, gint src_x, gint src_y, gint width, gint height )
Transfers image data from a
GdkWindow and converts it to an RGB(A)
representation inside a
GdkPixbuf. In other words, copies
image data from a server-side drawable to a client-side RGB(A) buffer.
This allows you to efficiently read individual pixels on the client side.
This function will create an RGB pixbuf with 8 bits per channel with
the size specified by the
height arguments scaled by the
scale factor of
window. The pixbuf will contain an alpha channel if
window contains one.
If the window is off the screen, then there is no image data in the obscured/offscreen regions to be placed in the pixbuf. The contents of portions of the pixbuf corresponding to the offscreen region are undefined.
If the window you’re obtaining data from is partially obscured by other windows, then the contents of the pixbuf areas corresponding to the obscured regions are undefined.
If the window is not mapped (typically because it’s iconified/minimized
or not on the current workspace), then
NULL will be returned.
If memory can’t be allocated for the return value,
NULL will be returned instead.
(In short, there are several ways this function can fail, and if it fails
NULL; so check the return value.)
The data is owned by the caller of the function.
Source X coordinate within
Source Y coordinate within
Width in pixels of region to get.
Height in pixels of region to get.
A newly-created pixbuf with a
reference count of 1, or
NULL on error.
|The caller of the function takes ownership of the data, and is responsible for freeing it.|
|The return value can be |