Re: [freesci-develop] Alpha on mouse pointer

[Christoph Reichenbach]

Alex,

On Mon, Feb 06, 2006 at 08:38:18AM +0930, Alex Angas wrote:
> Can someone please help me out with the correct way to the
> determine the alpha mask for the mouse pointer?

  If you have a look at the pointer's index data, all colours except for
GFX_COLOR_INDEX_TRANSPARENT are opaque.  So you can calculate the alpha mask
by going through the index data.

  Since this is evidently a bugfixing task and thus meets the qualifications
of the code freeze, I've taken the liberty of moving the xlib implementation
of this process (now documented in gfx_driver.h as
gfx_create_mono_cursor_mask()) into a more accessible place, i.e. you should
be able to use the prototype directly now.

  This can give you the opacity/alpha mask directly as a bitmask (scaled, if
neccessary), which is most likely what you want. Let me know if it is not.

-- Christoph

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