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openSUSE:Backports:SLE-15-SP2:Update
libqt4.15252
fix-medium-font.diff
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File fix-medium-font.diff of Package libqt4.15252
From: Ken VanDine <ken.vandine@canonical.com> Description: Default to regular font in X11 Default to Regular/Normal instead of Medium in QFontDatabase for X11. . Tweak the buckets so that Medium has preference over Bold when DemiBold is requested. Bug-Ubuntu: https://launchpad.net/bugs/744812 Bug: https://bugreports.qt-project.org/browse/QTBUG-27301 Forwarded: https://codereview.qt-project.org/#change,35591 Author: Michał Sawicz<michal.sawicz@canonical.com> --- a/src/gui/text/qfontdatabase_x11.cpp +++ b/src/gui/text/qfontdatabase_x11.cpp @@ -729,10 +729,17 @@ static int getFCWeight(int fc_weight) { int qtweight = QFont::Black; - if (fc_weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_MEDIUM) / 2) + if (fc_weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_REGULAR) / 2) qtweight = QFont::Light; - else if (fc_weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2) + else if (fc_weight <= (FC_WEIGHT_REGULAR + FC_WEIGHT_MEDIUM) / 2) qtweight = QFont::Normal; +#if 0 + // FIXME: Uncomment this when it's safe to expand the Enum to include ::Medium + // Will map Medium to DemiBold via fallthrough for the moment, + // but avoids API/ABI break + else if (fc_weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2) + qtweight = QFont::Medium; +#endif else if (fc_weight <= (FC_WEIGHT_DEMIBOLD + FC_WEIGHT_BOLD) / 2) qtweight = QFont::DemiBold; else if (fc_weight <= (FC_WEIGHT_BOLD + FC_WEIGHT_BLACK) / 2) @@ -772,9 +779,13 @@ fontDef.styleHint */ + // Default to Regular and thus to the common case. Previous + // versions of Qt requested Medium as default. This is fine until + // a Medium weight is actually provided by a font, and so gets + // promoted to bold fallthrough. int weight; if (FcPatternGetInteger(pattern, FC_WEIGHT, 0, &weight) != FcResultMatch) - weight = FC_WEIGHT_MEDIUM; + weight = FC_WEIGHT_REGULAR; fontDef.weight = getFCWeight(weight); int slant; @@ -1066,16 +1077,19 @@ // capitalize(value); familyName = QString::fromUtf8((const char *)value); slant_value = FC_SLANT_ROMAN; - weight_value = FC_WEIGHT_MEDIUM; + weight_value = FC_WEIGHT_REGULAR; spacing_value = FC_PROPORTIONAL; file_value = 0; index_value = 0; scalable = FcTrue; + // Fallthroughs in case a match was not found. In previous + // versions of Qt, Medium was requested from FontConfig, + // leading to a promotion from Medium to Bold. if (FcPatternGetInteger (fonts->fonts[i], FC_SLANT, 0, &slant_value) != FcResultMatch) slant_value = FC_SLANT_ROMAN; if (FcPatternGetInteger (fonts->fonts[i], FC_WEIGHT, 0, &weight_value) != FcResultMatch) - weight_value = FC_WEIGHT_MEDIUM; + weight_value = FC_WEIGHT_REGULAR; if (FcPatternGetInteger (fonts->fonts[i], FC_SPACING, 0, &spacing_value) != FcResultMatch) spacing_value = FC_PROPORTIONAL; if (FcPatternGetString (fonts->fonts[i], FC_FILE, 0, &file_value) != FcResultMatch) @@ -1487,14 +1501,32 @@ } int weight_value = FC_WEIGHT_BLACK; + // Default and request Regular font weight if none specified + // Previous versions of Qt default to requesting Medium, even + // though this weight does not typically exist. if (request.weight == 0) - weight_value = FC_WEIGHT_MEDIUM; + weight_value = FC_WEIGHT_REGULAR; else if (request.weight < (QFont::Light + QFont::Normal) / 2) weight_value = FC_WEIGHT_LIGHT; - else if (request.weight < (QFont::Normal + QFont::DemiBold) / 2) +#if 0 + // FIXME: Avoid ABI Break; active this full codepath when + // QFont::Medium enum is available in the future + else if (request.weight < (QFont::Normal + QFont::Medium) / 2) + weight_value = FC_WEIGHT_REGULAR; + else if (request.weight < (QFont::Medium + QFont::DemiBold) / 2) weight_value = FC_WEIGHT_MEDIUM; else if (request.weight < (QFont::DemiBold + QFont::Bold) / 2) weight_value = FC_WEIGHT_DEMIBOLD; +#else + // For the moment This may still not full-circle correctly; via + // Medium->DemiBold->Bold promotion. However It's hard to do much + // about this without an ABI/API tweak to include the fuller set + // of standard TTF/CSS/FontConfig weights. + else if (request.weight < (QFont::Normal + QFont::DemiBold) / 2) + weight_value = FC_WEIGHT_REGULAR; + else if (request.weight < (QFont::DemiBold + QFont::Bold) / 2) + weight_value = (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2; +#endif else if (request.weight < (QFont::Bold + QFont::Black) / 2) weight_value = FC_WEIGHT_BOLD; FcPatternDel(pattern, FC_WEIGHT);
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