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  1. Qt
  2. QTBUG-44345

[REG 5.3->5.4] OS X: Unnecessary error messages about missing fonts

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    • Icon: Bug Bug
    • Resolution: Invalid
    • Icon: P2: Important P2: Important
    • None
    • 5.4.0
    • Core: Plugins, GUI: Font handling
    • None
    • OS X 10.9.5
    • macOS

      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.

        1. dont-warn-missing-fallback-fonts.patch
          0.8 kB
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            vestbo Tor Arne Vestbø
            rjvbertin René Bertin
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