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X Drawables to Pixbufs

X Drawables to Pixbufs — Getting parts of an X drawable's image data into a pixbuf.

Includes

#include <gdk-pixbuf/gdk-pixbuf.h>

Description

The functions in this section allow you to take the image data from an X drawable and dump it into a GdkPixbuf. This can be used for screenshots and other special effects. Note that these operations can be expensive, since the image data has to be transferred from the X server to the client program and converted.

These functions are analogous to those for the GDK version of &gdk-pixbuf;.

Functions

gdk_pixbuf_xlib_get_from_drawable ()

GdkPixbuf *
gdk_pixbuf_xlib_get_from_drawable (GdkPixbuf *dest,
                                   Drawable src,
                                   Colormap cmap,
                                   Visual *visual,
                                   int src_x,
                                   int src_y,
                                   int dest_x,
                                   int dest_y,
                                   int width,
                                   int height);

Transfers image data from a Gdk drawable and converts it to an RGB(A) representation inside a GdkPixbuf.

If the drawable src is a pixmap, then a suitable colormap must be specified, since pixmaps are just blocks of pixel data without an associated colormap. If the drawable is a window, the cmap argument will be ignored and the window's own colormap will be used instead.

If the specified destination pixbuf dest is NULL, then this function will create an RGB pixbuf with 8 bits per channel and no alpha, with the same size specified by the width and height arguments. In this case, the dest_x and dest_y arguments must be specified as 0, otherwise the function will return NULL. If the specified destination pixbuf is not NULL and it contains alpha information, then the filled pixels will be set to full opacity.

If the specified drawable is a pixmap, then the requested source rectangle must be completely contained within the pixmap, otherwise the function will return NULL.

If the specified drawable is a window, then it must be viewable, i.e. all of its ancestors up to the root window must be mapped. Also, the specified source rectangle must be completely contained within the window and within the screen. If regions of the window are obscured by noninferior windows, the contents of those regions are undefined. The contents of regions obscured by inferior windows of a different depth than that of the source window will also be undefined.

Parameters

dest

Destination pixbuf, or NULL if a new pixbuf should be created.

 

src

Source drawable.

 

cmap

A colormap if src is a pixmap. If it is a window, this argument will be ignored.

 

visual

A visual if src is a pixmap. If it is a window, this argument will be ignored.

 

src_x

Source X coordinate within drawable.

 

src_y

Source Y coordinate within drawable.

 

dest_x

Destination X coordinate in pixbuf, or 0 if dest is NULL.

 

dest_y

Destination Y coordinate in pixbuf, or 0 if dest is NULL.

 

width

Width in pixels of region to get.

 

height

Height in pixels of region to get.

 

Returns

The same pixbuf as dest if it was non-NULL, or a newly-created pixbuf with a reference count of 1 if no destination pixbuf was specified; in the latter case, NULL will be returned if not enough memory could be allocated for the pixbuf to be created.

Types and Values

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