static inline int weightFromFcWeight(int fcweight)
{
// Font Config uses weights from 0 to 215 (the highest enum value) while QFont ranges from
// 0 to 99. The spacing between the values for the enums are uneven so a linear mapping from
// Font Config values to Qt would give surprising results. So, we do a piecewise linear
// mapping. This ensures that where there is a corresponding enum on both sides (for example
// FC_WEIGHT_DEMIBOLD and QFont::DemiBold) we map one to the other but other values map
// to intermediate Qt weights.
if (fcweight <= FC_WEIGHT_THIN)
return QFont::Thin;
if (fcweight <= FC_WEIGHT_ULTRALIGHT)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_THIN, FC_WEIGHT_ULTRALIGHT, QFont::Thin, QFont::ExtraLight);
if (fcweight <= FC_WEIGHT_LIGHT)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_ULTRALIGHT, FC_WEIGHT_LIGHT, QFont::ExtraLight, QFont::Light);
if (fcweight <= FC_WEIGHT_NORMAL)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_LIGHT, FC_WEIGHT_NORMAL, QFont::Light, QFont::Normal);
if (fcweight <= FC_WEIGHT_MEDIUM)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_NORMAL, FC_WEIGHT_MEDIUM, QFont::Normal, QFont::Medium);
if (fcweight <= FC_WEIGHT_DEMIBOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_MEDIUM, FC_WEIGHT_DEMIBOLD, QFont::Medium, QFont::DemiBold);
if (fcweight <= FC_WEIGHT_BOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_DEMIBOLD, FC_WEIGHT_BOLD, QFont::DemiBold, QFont::Bold);
if (fcweight <= FC_WEIGHT_ULTRABOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_BOLD, FC_WEIGHT_ULTRABOLD, QFont::Bold, QFont::ExtraBold);
if (fcweight <= FC_WEIGHT_BLACK)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_ULTRABOLD, FC_WEIGHT_BLACK, QFont::ExtraBold, QFont::Black);
if (fcweight <= FC_WEIGHT_ULTRABLACK)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_BLACK, FC_WEIGHT_ULTRABLACK, QFont::Black, maxWeight);
return maxWeight;
}
static inline int weightFromFcWeight(int fcweight)
{
// Font Config uses weights from 0 to 215 (the highest enum value) while QFont ranges from
// 0 to 99. The spacing between the values for the enums are uneven so a linear mapping from
// Font Config values to Qt would give surprising results. So, we do a piecewise linear
// mapping. This ensures that where there is a corresponding enum on both sides (for example
// FC_WEIGHT_DEMIBOLD and QFont::DemiBold) we map one to the other but other values map
// to intermediate Qt weights.
#if (QT_VERSION >= QT_VERSION_CHECK(5, 5, 0))
if (fcweight <= FC_WEIGHT_THIN)
return QFont::Thin;
if (fcweight <= FC_WEIGHT_ULTRALIGHT)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_THIN, FC_WEIGHT_ULTRALIGHT, QFont::Thin, QFont::ExtraLight);
if (fcweight <= FC_WEIGHT_LIGHT)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_ULTRALIGHT, FC_WEIGHT_LIGHT, QFont::ExtraLight, QFont::Light);
if (fcweight <= FC_WEIGHT_NORMAL)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_LIGHT, FC_WEIGHT_NORMAL, QFont::Light, QFont::Normal);
if (fcweight <= FC_WEIGHT_MEDIUM)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_NORMAL, FC_WEIGHT_MEDIUM, QFont::Normal, QFont::Medium);
if (fcweight <= FC_WEIGHT_DEMIBOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_MEDIUM, FC_WEIGHT_DEMIBOLD, QFont::Medium, QFont::DemiBold);
if (fcweight <= FC_WEIGHT_BOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_DEMIBOLD, FC_WEIGHT_BOLD, QFont::DemiBold, QFont::Bold);
if (fcweight <= FC_WEIGHT_ULTRABOLD)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_BOLD, FC_WEIGHT_ULTRABOLD, QFont::Bold, QFont::ExtraBold);
if (fcweight <= FC_WEIGHT_BLACK)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_ULTRABOLD, FC_WEIGHT_BLACK, QFont::ExtraBold, QFont::Black);
if (fcweight <= FC_WEIGHT_ULTRABLACK)
return mapToQtWeightForRange(fcweight, FC_WEIGHT_BLACK, FC_WEIGHT_ULTRABLACK, QFont::Black, maxWeight);
return maxWeight;
#else
const int maxWeight = 99;
int qtweight;
if (fcweight < 0)
qtweight = 0;
else if (fcweight <= FC_WEIGHT_LIGHT)
qtweight = (fcweight * QFont::Light) / FC_WEIGHT_LIGHT;
else if (fcweight <= FC_WEIGHT_NORMAL)
qtweight = QFont::Light + ((fcweight - FC_WEIGHT_LIGHT) * (QFont::Normal - QFont::Light)) / (FC_WEIGHT_NORMAL - FC_WEIGHT_LIGHT);
else if (fcweight <= FC_WEIGHT_DEMIBOLD)
qtweight = QFont::Normal + ((fcweight - FC_WEIGHT_NORMAL) * (QFont::DemiBold - QFont::Normal)) / (FC_WEIGHT_DEMIBOLD - FC_WEIGHT_NORMAL);
else if (fcweight <= FC_WEIGHT_BOLD)
qtweight = QFont::DemiBold + ((fcweight - FC_WEIGHT_DEMIBOLD) * (QFont::Bold - QFont::DemiBold)) / (FC_WEIGHT_BOLD - FC_WEIGHT_DEMIBOLD);
else if (fcweight <= FC_WEIGHT_BLACK)
qtweight = QFont::Bold + ((fcweight - FC_WEIGHT_BOLD) * (QFont::Black - QFont::Bold)) / (FC_WEIGHT_BLACK - FC_WEIGHT_BOLD);
else if (fcweight <= FC_WEIGHT_ULTRABLACK)
qtweight = QFont::Black + ((fcweight - FC_WEIGHT_BLACK) * (maxWeight - QFont::Black)) / (FC_WEIGHT_ULTRABLACK - FC_WEIGHT_BLACK);
else
qtweight = maxWeight;
return qtweight;
#endif
}
