83416 - detect bitmap scaled fonts

Status: VERIFIED DUPLICATE of bug 74889

(Core :: Internationalization, defect)

Description

[kill this account]

Bitmapped scaled font are very ugly.

Because we have not had a way to distinguish bitmap scaled fonts (ugly) from
outline scaled fonts (good looking) we ten to avoid using scaled fonts.

The code does avoids scaling by picking "similar" sized bitmap (non-scaled)
fonts. This can cause the font to be larger or smaller than the CSS specified
font sometimes leading to poor results.

Perhaps we should use this test:

> http://www.xfree86.org/archives/fonts/2000-Feb/0012.shtml
>     There's a trick for this that works well with commonly available X 
>     servers, though it probably has no theoretical justification. 
>     Scaleable fonts returned by XListFonts (0 point and pixel size) that 
>     are just scaled bitmaps have non-0 X and Y resolution fields, while 
>     true scaleable fonts have 0 in those fields. 
> 
>     The GTK+ font selector uses this technique, and I haven't heard 
>     of any complaints about it failing there. 
> 
>     Regards, 
> 
>                                            Owen

Comment 1

[kill this account]

Attachment: patch: add test for bitmap scaled fonts, add debug code to examine font properties

Comment 2

[Frank Tang]

I don't think this is critical for moz0.9.2, but I think it will be nice to have 
for moz0.9.3

Comment 3

[kill this account]

bug 74889 includes this

*** This bug has been marked as a duplicate of 74889 ***

Comment 4

[Yuying Long]

Verified as dup.