tktrans apparently implements shaped windows. It is available only for Windows.
lexfiend 4 Dec 2005: The project home page is at [L1 ], but the binary distribution at SourceForge [L2 ] seems to have been stubs-enabled by Jeff Hobbs, so it's probably a better bet.
schlenk 4 Dec 2005: Sadly this doesn't play nice with wm attributes -alpha.
JH The -alpha issue, or any call that causes a rewrap of the toplevel hwnd wraper (like overrideredirect), is that the SetWindowRgn API is applied to the toplevel hwnd wrapper "behind Tk's back", so when it rewraps, that is lost. Tk could look for that - assuming somebody might set it, but you should try and reapply the region after such changes.
DKF: This package works by using the bright magenta parts of an image as a mask. This is a horrible trick. FW: Not bright magenta in general, at least, just #FF00FF.
JH: I have a variant that works based off the transparent pixel (fully trnasparent areas are not drawn - partial transparency isn't supported, but may be possible in Win 2000+).
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