bugFree UCS Outline Fonts - Bugs: bug #44480, Bàng-uâ-cê letter issue


bug #44480: Bàng-uâ-cê letter issue

Submitted by:  Hsing-yen He <hammerandsickle>
Submitted on:  Sun 08 Mar 2015 04:50:11 AM UTC  
Category: individual character(s)Severity: 3 - Normal
Item Group: letter positioning poorStatus: Fix posted
Privacy: PublicAssigned to: Steve White <Stevan_White>
Open/Closed: OpenRelease: development

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Sat 08 Aug 2015 05:11:23 PM UTC, comment #6:

Hi Hsing-yen,

again, could you be more specific as to what you are seeing, what seems wrong to you.

In the attached, the kerning seems pretty good to me. The macron on i is here and there closer than I would like to capitals...

(file #34602, file #34603)

Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Sat 08 Aug 2015 09:56:43 AM UTC, comment #5:

I found there is a small problem for kerning in BUC words. When I copied the BUC semple text from Wikipedia, I found Nĭk-tàu kerned badly in FreeSerif Italic and Bold Italic, Cī-hâ also kerned badly in FreeSerif Bold Italic.

You can see this sample text from here:

Hsing-yen He <hammerandsickle>
Sun 08 Mar 2015 08:28:07 PM UTC, comment #4:

I found the difference, but I don't understand why it causes this problem.

There are special Unicode characters, U+1E72-3, U and u with dieresis below. But I find no special characters for the other vowels with a dieresis below.

And indeed the dieresis in those precomposed forms was positioned slightly differently from that prescribed by the mark positioning anchors. This in itself is a little bug, which I will fix.

BUT, there is nothing I can think of that would have called for the replacement of the vowel+mark by the precomposed letter. There are table entries to go the other way, which are activated by the small-caps feature.

It remains a mystery, and it worries me. We need to understand how this techonology works.

Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Sun 08 Mar 2015 01:10:47 PM UTC, comment #3:

I also find this problem in FreeSans, but the result is reverse.

(file #33289)

Hsing-yen He <hammerandsickle>
Sun 08 Mar 2015 11:57:43 AM UTC, comment #2:

I see it in Firefox on Linux. The dieresis is very slightly higher under the U and u than under the other vowels.

But its origin is a complete mystery. I double-checked the font, and the y-coordinate of the positioning anchor for u is identical to that for the other vowels.

I'll have to think about it.

(Normally I would first guess it was a quirk of the font rendering software, but I read BabelPad uses MS UniScribe, where Firefox on my system is using Harfbuzz. It would seem unlikely.)

(file #33287, file #33288)

Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Sun 08 Mar 2015 07:42:24 AM UTC, comment #1:

Hi Hsing-yen,

I don't see that effect.

Please send us a screenshot.

Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Sun 08 Mar 2015 04:50:11 AM UTC, original submission:

Hi Steve,

I found in Bàng-uâ-cê, a̤, e̤ and o̤ looks different from ṳ, which diaersis below posotioned farther than ṳ. Please fix it.

See: http://en.wikipedia.org/wiki/Foochow_Romanized

Hsing-yen He <hammerandsickle>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach File(s):

Attached Files
file #33289:  Screenshot 2.zip added by hammerandsickle (220KiB - application/zip)
file #33284:  Screenshots.zip added by hammerandsickle (280KiB - application/zip)


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -unavailable- added by Stevan_White (Posted a comment)
  • -unavailable- added by hammerandsickle (Submitted the item)

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    Follow 12 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sat 08 Aug 2015 05:11:23 PM UTCStevan_WhiteAttached File-=>Added Bàng-uâ-cê.html, #34602
      Attached File-=>Added Bàng-uâ-cê-test.pdf, #34603
    Sun 12 Apr 2015 09:09:01 AM UTCStevan_WhiteStatusProceeding=>Fix posted
    Sun 08 Mar 2015 08:28:07 PM UTCStevan_WhiteStatusConfirmed=>Proceeding
    Sun 08 Mar 2015 01:10:47 PM UTChammerandsickleAttached File-=>Added Screenshot 2.zip, #33289
    Sun 08 Mar 2015 11:57:43 AM UTCStevan_WhiteAttached File-=>Added u_dieresis_below.html, #33287
      Attached File-=>Added u_dieresis_below.png, #33288
      StatusNeed info=>Confirmed
    Sun 08 Mar 2015 08:22:04 AM UTChammerandsickleAttached File-=>Added Screenshots.zip, #33284
    Sun 08 Mar 2015 07:42:24 AM UTCStevan_WhiteItem Groupglyph(s) incorrect=>letter positioning poor
      StatusNone=>Need info
      Assigned toNone=>Stevan_White

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