RGtk2 (version 2.12.17)

gdkPixbufRenderThresholdAlpha: 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

[GdkPixbuf] A pixbuf.

bitmap

[GdkBitmap] Bitmap where the bilevel mask will be painted to.

src.x

[integer] Source X coordinate.

src.y

[integer] source Y coordinate.

dest.x

[integer] Destination X coordinate.

dest.y

[integer] Destination Y coordinate.

width

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

height

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

alpha.threshold

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