[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped (using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

--- Comment #10 from Volga  ---
Costas, you can contact him with this email site: nem...@numbertext.org

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped (using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

V Stuart Foote  changed:

   What|Removed |Added

   See Also||https://bugs.documentfounda
   ||tion.org/show_bug.cgi?id=10
   ||5346

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped (using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

--- Comment #9 from Costas  ---
I think this should be revisited, because the fonts print exactly as intended
and in PDF too even if they don't display properly (even in current stable
version). 

With openGL on, it requires a screen refresh (even by scrolling beyond the
character) to display the ligatures but then they dissappear again randomly. 

Since openGL was not on by default, I spent a considerable amount of time
trying to find out why the ligatures were not displaying properly, and I was in
the process of opening a new bug.

It makes me wonder if other fonts (complex languages) have the same problem.

I tried to find out who to contact for the font but cannot find who is
responsible for maintenance of th G version. :(

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

--- Comment #8 from Volga  ---
Is there anyway to make such glyphs not being clipped?

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

--- Comment #7 from V Stuart Foote  ---
(In reply to Khaled Hosny from comment #6)
> This is a font bug; the font has glyphs with large descenders that goes
> below the font clipping metrics (usWinDescent of the “OS/2” table). The font
> has to be fixed.

I don't doubt the metrics to be bad, but there still is an issue with composing
the table with the OpenGL rendering.  Try the STR from comment 3, restated
here.

1. Download László's Graphite "fontfeatures.odt" sampler [1]
2. Open with recent build of master or 5.3.1
3. With OpenGL rendering enabled
4. scroll to the first tables row holding the liga examples
5. zoom to 400% and pan to show the "Result column" ending with the "gf"
ligature
6. note that glyphs on the bottom row of the table cell are clipped
7. "adjust the table column" by grabbing the right edge and dragging
8. drag wider to bring the "gfi" and "gj" ligature result up a line
9. note glyphs that had been clipped, are fully formed
10. drag narrower to push back down and they are again clipped.

11. close document, and disable OpenGL rendering restart with Default rendering
12. repeat opening and zoom & pan to the liga row
13. the "gf", "gfi", and "gj" ligature results are clipped regardless of
position--so different handling of layout between the Default rendering and the
OpenGL rendering.

So, rather than just the font metrics which are bad, there is a
DirectWrite/Direct2D aspect here in composing to canvas.  Not sure we can
entirely NOTOURBUG this--at the least it is something to test against when the
DirectWrite calls are eventually refactored.

=-ref-=
[1] http://www.numbertext.org/linux/fontfeatures.odt

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

Khaled Hosny  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 CC||khaledho...@eglug.org
 Resolution|--- |NOTOURBUG

--- Comment #6 from Khaled Hosny  ---
This is a font bug; the font has glyphs with large descenders that goes below
the font clipping metrics (usWinDescent of the “OS/2” table). The font has to
be fixed.

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

--- Comment #5 from V Stuart Foote  ---
(In reply to Volga from comment #4)
> Since bug 105346, I’m sure this is an issue for glyphs with over height
> ascenders and descenders.

Well of course, but the issue is not with the glyphs alone but with the object
that contains them and its rendering to canvas. The ligature samples here are
held in a paragraph within a table cell. Only glyphs along the bottom edge of
the table cell are clipped.  

Unlike in bug 105346 neither scrolling canvas off the page and back, nor
zooming the canvas in or out affects the clipping that occurs for glyphs
positioned at the bottom edge of the cell.

The same glyphs copied to a paragraph are clipped, but that is transient and
cleared by canvas refresh or zoom.

Believe there are different rendering actions between table cell content and
simple paragraph content--the rendering of table cells is the issue here.

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

Volga  changed:

   What|Removed |Added

   See Also|https://bugs.documentfounda |
   |tion.org/show_bug.cgi?id=10 |
   |5346|

--- Comment #4 from Volga  ---
(In reply to V Stuart Foote from comment #3)
> So, not sure this is a shapping issue for the Graphite fonts, or an issue
> with the table cells and the way "spacing to border" is applied to glyphs
> with over height ascenders and descenders. 

Since bug 105346, I’m sure this is an issue for glyphs with over height
ascenders and descenders.

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

Volga  changed:

   What|Removed |Added

   See Also||https://bugs.documentfounda
   ||tion.org/show_bug.cgi?id=10
   ||5346

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[Libreoffice-bugs] [Bug 104846] The bottom edge of certain glyphs are clipped ( using Linux Libertine G)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104846

Volga  changed:

   What|Removed |Added

Summary|The bottom edge of glyph|The bottom edge of certain
   |are clipped (using Linux|glyphs are clipped (using
   |Libertine G)|Linux Libertine G)

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