[Libreoffice-bugs] [Bug 142560] New: Fallback glyphs are missing and the result text layout mess up

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=142560

            Bug ID: 142560
           Summary: Fallback glyphs are missing and the result text layout
                    mess up
           Product: LibreOffice
           Version: 7.2.0.0 alpha1+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: marklh9 at gmail.com

Description:
If the text contains glyphs that use level 2 fallback layout, the glyphs will
be missing and the text layout will mess up. The attached document contains two
lines. Two lines are identical except their formatting. The lines contain rare
used Chinese characters can be completely displayed with two different fonts,
MingLiU and MingLiU-Extb, as in the second line. The first line is formatted
with DFKAI-SB, so it uses up to two level fallback layout.

The first line can be displayed properly with Impress, which does not use
DrawTextArray of outdev, and can be fixed with [1], which disabled precomputed
cache items for fallback layout.

[1] https://gerrit.libreoffice.org/c/core/+/116134

Steps to Reproduce:
1.Open the attached file on Windows.


Actual Results:
The first line of the document can not be displayed properly.

Expected Results:
The first line of the document can be displayed properly.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.2.0.0.alpha1+ (x64) / LibreOffice Community
Build ID: 14e52313e4d350d9960cdd972e87b7f206ee4e2d
CPU threads: 16; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win
Locale: zh-TW (zh_TW); UI: en-US
Calc: CL

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/libreoffice-bugs/attachments/20210530/e63437b5/attachment.htm>