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IDProjectCategoryView StatusDate SubmittedLast Update
0030334Open CASCADE[OCCT] OCCT:Visualizationpublic2018-11-02 14:272019-05-06 15:37
Assigned Tobugmaster 
PlatformLinuxOSOS Version
Product Version 
Target Version[OCCT] 7.4.0Fixed in Version 
Summary0030334: Visualization - missing fonts are not properly reported by Font_FontMgr::FindFont()
Description- Font is not changed after changing font after -font
- The inscription is beyond the limits of the face (see attached picture)

Found on test case demo samples pencil
TagsNo tags attached.
Test case number
Attached Filespng file icon pencil.png (13,478 bytes) 2018-11-02 14:28
png file icon pensil_OK.png (9,293 bytes) 2019-01-16 00:16

- Relationships
duplicate of 0030439closedbugmaster Visualization - extend fonts search within Font_FontMgr::FindFont() on Linux 

-  Notes
kgv (developer)
2019-01-10 21:26
edited on: 2019-01-10 21:27

There are two issues:
1. text2brep never returns FALSE for unknown font, because historically font manager returns the following 2 fallbacks:
// Requested family name not found -> search for any font family with given aspect and height
// The last resort: trying to use ANY font available in the system

so that error will occur ONLY if font manager is completely empty.
Without any warning.

2. Modern Linux distributions might ignore X11 fonts registration (probably in attempt to go for Wayland, etc.),
so that the list of registered fonts detected by OCCT is very poor on not customized system (Xubuntu 18.04):
Draw[22]> vfont
Courier 10 Pitch regular /usr/share/fonts/X11/Type1/c0419bt_.pfb
Courier 10 Pitch italic /usr/share/fonts/X11/Type1/c0582bt_.pfb
Courier 10 Pitch bold /usr/share/fonts/X11/Type1/c0583bt_.pfb
Courier 10 Pitch bolditalic /usr/share/fonts/X11/Type1/c0611bt_.pfb
Bitstream Charter bold /usr/share/fonts/X11/Type1/c0632bt_.pfb
Bitstream Charter bolditalic /usr/share/fonts/X11/Type1/c0633bt_.pfb
Bitstream Charter regular /usr/share/fonts/X11/Type1/c0648bt_.pfb
Bitstream Charter italic /usr/share/fonts/X11/Type1/c0649bt_.pfb

while system actually has more fonts installed in standard folders.

It seems that problem 2 can be solved by relaxing conditions on Linux and reusing font searching code already used for macOS and Android.

The problem 1 is more difficult to fix, because if fallbacks will be removed from Font_FontMgr::FindFont(), then it should be moved to other places calling Font_FontMgr::FindFont() or otherwise text will not be displayed at all. Font_FontMgr::FindFont() can be extended with extra flag defining if fallback should be provided or not, but this would look confusing.

Alternatively, we may just emit Error messages within Font_FontMgr::FindFont(), so that fallback will be still provided, but user will be able to see that something going wrong.

kgv (developer)
2019-04-30 14:57
edited on: 2019-04-30 14:57

Dear bugmaster.

Please close as duplicate of 0030439.

- Issue History
Date Modified Username Field Change
2018-11-02 14:27 bugmaster New Issue
2018-11-02 14:27 bugmaster Assigned To => apn
2018-11-02 14:28 bugmaster Description Updated View Revisions
2018-11-02 14:28 bugmaster File Added: pencil.png
2018-11-02 14:29 bugmaster Assigned To apn => abv
2018-11-02 14:30 bugmaster Description Updated View Revisions
2019-01-10 21:26 kgv Note Added: 0081735
2019-01-10 21:26 kgv Status new => feedback
2019-01-10 21:27 kgv Note Edited: 0081735 View Revisions
2019-01-10 21:28 kgv Category OCCT:DRAW => OCCT:Visualization
2019-01-10 21:28 kgv Summary -font option of command text2brep works incorrectly on Linux platform when applied to the face => Visualization - missing fonts are not properly reported by Font_FontMgr::FindFont()
2019-01-10 23:13 kgv Relationship added related to 0030439
2019-01-16 00:16 kgv File Added: pensil_OK.png
2019-01-21 10:58 kgv Resolution open => duplicate
2019-01-21 10:58 kgv Relationship replaced duplicate of 0030439
2019-04-30 14:57 kgv Note Added: 0084076
2019-04-30 14:57 kgv Assigned To abv => bugmaster
2019-04-30 14:57 kgv Note Edited: 0084076 View Revisions
2019-05-06 15:37 bugmaster Status feedback => closed

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