gdkPixbufRenderThresholdAlpha {RGtk2}R Documentation

gdkPixbufRenderThresholdAlpha

Description

Takes the opacity values in a rectangular portion of a pixbuf and thresholds them to produce a bi-level alpha mask that can be used as a clipping mask for a drawable.

Usage

gdkPixbufRenderThresholdAlpha(object, bitmap, src.x, src.y, dest.x, dest.y, width = -1, height = -1, alpha.threshold)

Arguments

object

A pixbuf.

bitmap

Bitmap where the bilevel mask will be painted to.

src.x

Source X coordinate.

src.y

source Y coordinate.

dest.x

Destination X coordinate.

dest.y

Destination Y coordinate.

width

Width of region to threshold, or -1 to use pixbuf width

height

Height of region to threshold, or -1 to use pixbuf height

alpha.threshold

Opacity values below this will be painted as zero; all other values will be painted as one.

Author(s)

Derived by RGtkGen from GTK+ documentation


[Package RGtk2 version 2.20.21 Index]