Subpixel AA rendering bug

[Seth]

To reproduce, edit a file for a while with subpixel AA and full hinting on, and you should notice some fragments left behind.

http://reboot.zapto.org/~hexy/vimbugaa.png

Using Ubuntu 7.10, vim-gnome 7.1-056. Same thing happens with vim-gtk and latest vim. I am using the Consolas font, but I have tried other fonts and the same thing has happened. ctrl-l fixes it temporarily, but this can get annoying.

[Seth (hexcat)]

The redirect is down. Here is the image: http://76.84.82.20/~hexy/vimbugaa.png

[Tobias Wolf (towolf)]

That's GVim, right? Then I can't confirm for "Slight" hinting and gvim. I use it all the time, I would notice this.

[Seth (hexcat)]

Hello,

It is GVim, yes. I am still noticing it with slight hinting and subpixel AA
with Consolas and DejaVu Sans Mono in Gutsy. It used to look fine with
Feisty, so I'm not sure what changed with the subpixel AA that would cause
this only in GVim...

Thanks

On Tue, Feb 26, 2008 at 8:55 PM, Tobias Wolf <email address hidden> wrote:

> That's GVim, right? Then I can't confirm for "Slight" hinting and gvim.
> I use it all the time, I would notice this.
>
> --
> Subpixel AA rendering bug
> https://bugs.launchpad.net/bugs/190783
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Source Package "vim" in Ubuntu: New
>
> Bug description:
> To reproduce, edit a file for a while with subpixel AA and full hinting
> on, and you should notice some fragments left behind.
>
> http://reboot.zapto.org/~hexy/vimbugaa.png<http://reboot.zapto.org/%7Ehexy/vimbugaa.png>
>
> Using Ubuntu 7.10, vim-gnome 7.1-056. Same thing happens with vim-gtk and
> latest vim. I am using the Consolas font, but I have tried other fonts and
> the same thing has happened. ctrl-l fixes it temporarily, but this can get
> annoying.
>

[Tobias Wolf (towolf)]

Kann you give me a series of keystrokes, that always causes some artifacts? Then I might confirm this. I have Consolas.

[Seth (hexcat)]

Type @ then >> it over 5 or so times. I've attached what I'm seeing when I
do this with slight hinting, subpixel AA, and Consolas 10pt.

[Ilmari Vacklin (wolverian)]

I see this on Hardy. To reproduce, type @ and then press ctrl+t to indent it (or exit to normal mode and press >>). I only see this if any kind of hinting is used.

[Tobias Wolf (towolf)]

Right, I can confirm, too.
I think it is caused by Consolas having certain letters slightly wider or close to the horizontal advance space . If you look at the artifatcs, they seem to correspond to the fringes that fall outside the cursor while it is over the At sign, e.g.
With my font Pragmata, I see no artifacts. But when I select a proportional font with long swashes, I see even solid pixels of these remaining on screen.

[Vaibhav (vnagarnaik)]

I can confirm the issue on Lucid 10.04.1 with vim-gnome 2:7.2.330-1ubuntu3 with default Monospace font.