Re: A patch for enforcing double-width CJK character display

[黄建忠]

于 2012年04月17日 15:02, Miles Bader 写道:
> 黄建忠<address@hidden>  writes:
> > Maybe your system have a buggy "Lucida Sans TypeWriter" font, you can
> > try the lucida font released with JDK.
> > Hope the problem can be fixed.
> No, I think my copy of L-S-T is fine here (you can see from the images
> I sent in my previous message).
>
> Now that I've seen both, it looks like the issue is that the version
> of "Sazanami minchou" in Debian includes hand-tuned bitmaps.  These
> look much better in many cases, but because there's a limited number
> of them, and the font-rendering system prefers bitmaps, it chooses a
> slightly smaller size so it can use a bitmap.

Yes, I disabled embed-bitmap support in fontconfig, and only tested the 
OUTLINE glyphs of "Sazanami mincho".
I also found problems with some old PCF/BDF Chinese fonts, for example, 
"Song" and "FangSong" shiped with Xorg.
If I use such a font, the auto-matched Chinese pixelsize is even bigger 
than 2 * monospace width.:-(
By the way, some korean PCF fonts also had this problem.

At first, I disable pcf/bdf support in this patch, If it is a pcf/bdf 
font, just keep it unchanged.
but this is really not a good idea. for example, "SimSun.ttc"(the 
default font of Windowz XP CN version) is a very famous font for 
Chinese, almost everyone use it, it provides 9/10/11pt embedded bitmap 
"song". A lot of users even can not accept "ClearType" and "YaHei" in 
Vizta and Win 7. :-D

> The result is as you can see, that the size of CJK characters is
> smaller than you might expect from the size specified.
>
> Maybe this is such a rare case that it can be ignored, I dunno, but it
> does appear that everything is functioning properly...
Yes, I agree, We should try best to keep everything work well.
I consider to ignore PCF/BDF font again in this patch.
> -miles


--
Huang JianZhong