Details
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Bug
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Resolution: Invalid
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P2: Important
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None
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5.4.0
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None
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OS X 10.9.5
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macOS
Description
Qt 5.4.0 introduced handling of Apple's fallback font list or at least it introduced a warning message if the lookup of fonts in that list fails. This means that each and every application prints a list of repeated error messages about fonts that the user might have removed because they're of no use to him. In my case:
QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "STSongti-SC-Regular" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "STSongti-TC-Regular" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "DFKaiShu-SB-Estd-BF" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "DFKaiShu-SB-Estd-BF" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "Baghdad" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "Ayuthaya" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "BanglaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "SinhalaSangamMN" QCoreTextFontDatabase: Failed to resolve family name for PostScript name "TeluguSangamMN"
The question why Apple doesn't implement a locale-specific fallback font list aside, Qt doesn't need to warn about the lookup failure at all because these fallback fonts don't appear to serve any purpose.
The culprit is a qWarning() statement around line 449 in qtbase/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm .
I've attached a patch that activates the warning only when Qt is in debug build.
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