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<title>X Drawables to Pixbufs: GDK-PixBuf Reference Manual</title>
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<link rel="prev" href="gdk-pixbuf-Xlib-Rendering.html" title="Xlib Rendering">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Description
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X Drawables to Pixbufs
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X Drawables to Pixbufs — Getting parts of an X drawable's image data into a pixbuf.
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Functions
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GdkPixbuf *
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gdk_pixbuf_xlib_get_from_drawable ()
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Includes
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#include <gdk-pixbuf/gdk-pixbuf.h>
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Description
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The functions in this section allow you to take the image data
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from an X drawable and dump it into a GdkPixbuf. This can be
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used for screenshots and other special effects. Note that these
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operations can be expensive, since the image data has to be
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transferred from the X server to the client program and converted.
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These functions are analogous to those for the GDK version of
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&gdk-pixbuf;.
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Functions
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gdk_pixbuf_xlib_get_from_drawable ()
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GdkPixbuf *
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gdk_pixbuf_xlib_get_from_drawable (GdkPixbuf *dest,
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Drawable src,
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Colormap cmap,
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Visual *visual,
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int src_x,
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int src_y,
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int dest_x,
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int dest_y,
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int width,
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int height);
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Transfers image data from a Gdk drawable and converts it to an RGB(A)
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representation inside a GdkPixbuf.
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If the drawable src
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is a pixmap, then a suitable colormap must be specified,
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since pixmaps are just blocks of pixel data without an associated colormap.
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If the drawable is a window, the cmap
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argument will be ignored and the
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window's own colormap will be used instead.
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If the specified destination pixbuf dest
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is NULL, then this function will
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create an RGB pixbuf with 8 bits per channel and no alpha, with the same size
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specified by the width
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and height
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arguments. In this case, the dest_x
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and
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dest_y
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arguments must be specified as 0, otherwise the function will return
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NULL. If the specified destination pixbuf is not NULL and it contains alpha
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information, then the filled pixels will be set to full opacity.
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If the specified drawable is a pixmap, then the requested source rectangle
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must be completely contained within the pixmap, otherwise the function will
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return NULL.
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If the specified drawable is a window, then it must be viewable, i.e. all of
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its ancestors up to the root window must be mapped. Also, the specified
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source rectangle must be completely contained within the window and within
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the screen. If regions of the window are obscured by noninferior windows, the
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contents of those regions are undefined. The contents of regions obscured by
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inferior windows of a different depth than that of the source window will also
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be undefined.
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Parameters
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dest
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Destination pixbuf, or NULL if a new pixbuf should be created.
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src
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Source drawable.
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cmap
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A colormap if src
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is a pixmap. If it is a window, this argument will
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be ignored.
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visual
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A visual if src
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is a pixmap. If it is a window, this argument will
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be ignored.
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src_x
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Source X coordinate within drawable.
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src_y
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Source Y coordinate within drawable.
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dest_x
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Destination X coordinate in pixbuf, or 0 if dest
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is NULL.
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dest_y
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Destination Y coordinate in pixbuf, or 0 if dest
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is NULL.
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width
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Width in pixels of region to get.
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height
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Height in pixels of region to get.
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Returns
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The same pixbuf as dest
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if it was non-NULL, or a newly-created
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pixbuf with a reference count of 1 if no destination pixbuf was specified; in
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the latter case, NULL will be returned if not enough memory could be
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allocated for the pixbuf to be created.
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Types and Values
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Generated by GTK-Doc V1.25.1
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