That's xor of the color bits. The blue/red is due to xor'ing with the
subpixel antialiasing. It is more obvious if you put the cursor over a
solid colored area where you will see strange colors.
It cannot be achieved with Porter-Duff combinations. I am not sure if
OpenGL or DirectX supports it. I am also suspicious that overlay
hardware designed for cursors may not support it either.
This would either require adding something to Wayland to enable xor of a
cursor, or (more likely) you will have to just set the cursor to blank
and draw the desired graphics yourself.
Linux programs seem to use a white insertion bar with a black outline,
so it is visible against all backgrounds. This is despite the fact that
X11 still supports xor cursors, everybody dropped that as obsolete. OS/X
appears to use a black insertion bar with a very thin white outline (ie
partially-transparent white pixels). Both of these work with normal
compositing.
On 10/14/2015 06:13 AM, John Doerthy wrote:
Hi,
Could you please comment on this issue, if you are currently working on
the Windows-like implementation of the I-beam cursor (cursor for text
selection) in the graphical interface?
In Windows, the I-beam cursor, change color based on the background. So,
most of the time it's black, but when you are on the dark background its
color cahnges and not only that, but if part of the cursor is on the
white background and part on the dark background, only the affected
areas of teh I-beam cursor change the color. Plus if you are over a text
the part of the cursor that overlays some character has a slightly blue
or red color (as you can see in the screenshots below)
Here are some real world examples(screenshots) from Windows 7:
http://imgur.com/a/IxG7w
Thank for your response how far are you guys in implementing this feature.
John
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