Re: Painting Cursor Invisible

I guess you're talking about bitwise manipulation as in AND, OR, NOT, XOR.
I've programmed some in C years ago and I did some of that in Windows. I'm
sure I've seen bit inversions done on graphics. I don't know, maybe the
cursor is a special animal that
has very narrow programming options. Many years ago when I had an Amiga all
that stuff was a no brainer. All kinds of creative flexibility was built
in - of course after all the brilliant design work Commodore just let it
die.

"tacit" <tacitr@xxxxxxx> wrote in message
news:tacitr-2FFCCD.15445319122005@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> In article <gsjpf.7680$nm.3010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
> "dave" <dave268@xxxxxxxxxxxxxx> wrote:
>
>> Possibly it's a windows issue, but I have to wonder since after all, the
>> windows pointer is black and white which allows it to
>> be visible against any background.
>
> But the Windows cursor is more than one pixel wide.
>
> The Photoshop precise cursor is exactly one pixel wide, so you can't
> have it outlined in black or white.
>
> If you want to know the technical reason for the limitation: The Mac
> provides a number of cursor overlay modes, which tell the computer how
> to draw the cursor against the background. One of these overlay modes is
> called "xover." In this mode, a 50% gray cursor still shows up against a
> 50% gray background, because in xover mode the cursor's color is changed
> using a mathematical function involving the background it's over.
>
> Windows does not provide an xover mode. On a Windows machine, a 50% gray
> cursor vanishes against a 50% gray background.
>
> Photoshop CS2 on Windows solves this problem by not using the Windows
> cursor overlay modes at all; drawing the cursor is handled by Photoshop
> itself, not by Windows, and the Photoshop programmers used the Mac xover
> mode in the Windows version of Photoshop.
>
> The problem with doing this, which becomes obvious to anyone using a
> cursor in Brush Size mode (especially with a very large brush), is that
> handling tasks like drawing the cursor within the application is slow. A
> common complaint in CS2 for Windows, which does not affect CS2 for Mac,
> is poor cursor responsiveness, especially with large brushes.
>
> --
> Art, photography, shareware, polyamory, literature, kink:
> all at http://www.xeromag.com/franklin.html


.

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