Details
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Type:
Bug
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Status: Closed
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Priority:
P2: Important
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Resolution: Done
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Affects Version/s: 4.7.4, 4.8.0
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Fix Version/s: 4.8.7
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Component/s: GUI: Font handling, GUI: Printing
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Labels:None
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Environment:Windows
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Commits:8960f7356796948b161159cff404a9ebd1624c5f
Description
Our application sometimes crashes when using cached fonts after exporting a PDF, because a font engine that is in the cache has been deleted. I tried to reproduce this in a smaller test case, but unfortunately couldn't - however we have a 100% reproducible case in our application.
Exporting a PDF (or EPS) file with QPrinter uses a QFontSubset when embedding fonts. The destructor of this class deletes its QFontEngine if the reference count is zero, but it doesn't check the cache count. I think this is the problem - there's nothing stopping the font engine from being destroyed when it's still stored in the cache.
The fix should be simple: just add a check for cache_count == 0 in the QFontSubset destructor, before the font engine is destroyed.
Attachments
Issue Links
- is required for
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QTBUG-25378 QtPrintSupport - Font Issues
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- Open
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