gdkPixbufAddAlpha {RGtk2} | R Documentation |
Takes an existing pixbuf and adds an alpha channel to it. If the existing pixbuf already had an alpha channel, the channel values are copied from the original; otherwise, the alpha channel is initialized to 255 (full opacity).
gdkPixbufAddAlpha(object, substitute.color, r, g, b)
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[GdkPixbuf ] A GdkPixbuf . |
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[logical] Whether to set a color to zero opacity. If this
is FALSE , then the (r , g , b ) arguments will be ignored. |
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[raw] Red value to substitute. |
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[raw] Green value to substitute. |
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[raw] Blue value to substitute. |
If substitute.color
is TRUE
, then the color specified by (r
, g
, b
) will be
assigned zero opacity. That is, if you pass (255, 255, 255) for the
substitute color, all white pixels will become fully transparent.
[GdkPixbuf
] A newly-created pixbuf with a reference count of 1.
Derived by RGtkGen from GTK+ documentation