296255 - ClearType smoothing pixels are visible when the glyph itself is not

Status: RESOLVED INVALID

(Core :: Layout: Text and Fonts, defect)

Description

[Tim De Pauw]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050529 Firefox/1.0+ (bangbang023)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050529 Firefox/1.0+ (bangbang023)

When ClearType is enabled on Windows XP, glyphs that fall outside the visible
area by one pixel cause their sub-pixel smoothing pixels to be *inside* the
visible area. Those pixels are pretty noticeable, since they're a different
color. I will attach a test case and a screenshot of how it looks on my screen.

Reproducible: Always

Steps to Reproduce:

Comment 1

[Tim De Pauw]

Attachment: Test case (depends on remote CSS and Verdana font)

Comment 2

[Tim De Pauw]

Attachment: Screenshot with 400% view of problem area

Comment 3

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
this problem in the latest version of the product (see below for how to obtain a
copy) or, for feature requests, if it's not present in the latest version and
you still believe we should implement it, please visit the URL of this bug
(given at the top of this mail) and add a comment to that effect, giving more
reproduction information if you have it.

If it is not a problem any longer, you need take no action. If this bug is not
changed in any way in the next two weeks, it will be automatically resolved.
Thank you for your help in this matter.

The latest beta releases can be obtained from:
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Thunderbird: http://www.mozilla.org/products/thunderbird/releases/1.5beta1.html
Seamonkey:   http://www.mozilla.org/projects/seamonkey/

Comment 4

[billyswong]

Is it possible to be resolved?  I can't think up any idea.

Comment 5

[Tim De Pauw]

I have no idea how this all works, but it is probably Windows's job to avoid it. Depends if Windows knows where the viewable area ends, I suppose.

Comment 6

[Tim De Pauw]

Confirming that it's Windows's job. Just noticed the same behavior in Forté Agent.

Comment 7

[Wayne Mery (:wsmwk)]

(In reply to Tim De Pauw (ct^) from comment #6)
> Confirming that it's Windows's job. Just noticed the same behavior in Forté
> Agent.

so iINVALID?

Comment 8

[Tim De Pauw]

(In reply to Wayne Mery (:wsmwk) from comment #7)
> so iINVALID?

Presumably.

Comment 9

[Matthias Versen [:Matti]]

marking invalid (the same issues happens in other applications)