RGtk2: gdkPixbufRenderToDrawableAlpha – R documentation

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gdkPixbufRenderToDrawableAlpha

Description

Renders a rectangular portion of a pixbuf to a drawable. The destination drawable must have a colormap. All windows have a colormap, however, pixmaps only have colormap by default if they were created with a non-NULL window argument. Otherwise a colormap must be set on them with gdk_drawable_set_colormap. WARNING: gdk_pixbuf_render_to_drawable_alpha has been deprecated since version 2.4 and should not be used in newly-written code. This function is obsolete. Use gdkDrawPixbuf instead.

Usage

gdkPixbufRenderToDrawableAlpha(object, drawable, src.x = 0, src.y = 0, 
    dest.x, dest.y, width = -1, height = -1, alpha.mode = NULL, 
    alpha.threshold = NULL, dither = "GDK_RGB_DITHER_NORMAL", 
    x.dither = 0, y.dither = 0)

Arguments

`object`	A pixbuf.
`drawable`	Destination drawable.
`src.x`	Source X coordinate within pixbuf.
`src.y`	Source Y coordinates within pixbuf.
`dest.x`	Destination X coordinate within drawable.
`dest.y`	Destination Y coordinate within drawable.
`width`	Width of region to render, in pixels, or -1 to use pixbuf width.
`height`	Height of region to render, in pixels, or -1 to use pixbuf height.
`alpha.mode`	Ignored. Present for backwards compatibility.
`alpha.threshold`	Ignored. Present for backwards compatibility
`dither`	Dithering mode for GdkRGB.
`x.dither`	X offset for dither.
`y.dither`	Y offset for dither.

Details

On older X servers, rendering pixbufs with an alpha channel involves round trips to the X server, and may be somewhat slow.

Author(s)

Derived by RGtkGen from GTK+ documentation

RGtk2

R Bindings for Gtk 2.8.0 and Above

v2.20.36

GPL

Authors

Michael Lawrence <michafla@gene.com> and Duncan Temple Lang <duncan@wald.ucdavis.edu>

Initial release