diff options
Diffstat (limited to 'src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp')
| -rw-r--r-- | src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp | 67 |
1 files changed, 50 insertions, 17 deletions
diff --git a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp index 8c3ca2d229..da4007ff21 100644 --- a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp +++ b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp @@ -69,21 +69,52 @@ static inline bool requiresOpenType(int writingSystem) || writingSystem == QFontDatabase::Khmer || writingSystem == QFontDatabase::Nko); } -static int getFCWeight(int fc_weight) +static inline int weightFromFcWeight(int fcweight) { - int qtweight = QFont::Black; - if (fc_weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_REGULAR) / 2) - qtweight = QFont::Light; - else if (fc_weight <= (FC_WEIGHT_REGULAR + FC_WEIGHT_MEDIUM) / 2) - qtweight = QFont::Normal; - else if (fc_weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_BOLD) / 2) - qtweight = QFont::DemiBold; - else if (fc_weight <= (FC_WEIGHT_BOLD + FC_WEIGHT_BLACK) / 2) - qtweight = QFont::Bold; + // 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. + 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; } +static inline int stretchFromFcWidth(int fcwidth) +{ + // Font Config enums for width match pretty closely with those used by Qt so just use + // Font Config values directly while enforcing the same limits imposed by QFont. + const int maxStretch = 4000; + int qtstretch; + if (fcwidth < 1) + qtstretch = 1; + else if (fcwidth > maxStretch) + qtstretch = maxStretch; + else + qtstretch = fcwidth; + + return qtstretch; +} + static const char *specialLanguages[] = { "", // Unknown "", // Inherited @@ -309,6 +340,7 @@ void QFontconfigDatabase::populateFontDatabase() int weight_value; int slant_value; int spacing_value; + int width_value; FcChar8 *file_value; int indexValue; FcChar8 *foundry_value; @@ -322,7 +354,7 @@ void QFontconfigDatabase::populateFontDatabase() const char *properties [] = { FC_FAMILY, FC_STYLE, FC_WEIGHT, FC_SLANT, FC_SPACING, FC_FILE, FC_INDEX, - FC_LANG, FC_CHARSET, FC_FOUNDRY, FC_SCALABLE, FC_PIXEL_SIZE, FC_WEIGHT, + FC_LANG, FC_CHARSET, FC_FOUNDRY, FC_SCALABLE, FC_PIXEL_SIZE, FC_WIDTH, #if FC_VERSION >= 20297 FC_CAPABILITY, @@ -356,6 +388,8 @@ void QFontconfigDatabase::populateFontDatabase() slant_value = FC_SLANT_ROMAN; if (FcPatternGetInteger (fonts->fonts[i], FC_WEIGHT, 0, &weight_value) != FcResultMatch) weight_value = FC_WEIGHT_REGULAR; + if (FcPatternGetInteger (fonts->fonts[i], FC_WIDTH, 0, &width_value) != FcResultMatch) + width_value = FC_WIDTH_NORMAL; 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) @@ -417,17 +451,16 @@ void QFontconfigDatabase::populateFontDatabase() : ((slant_value == FC_SLANT_OBLIQUE) ? QFont::StyleOblique : QFont::StyleNormal); - QFont::Weight weight = QFont::Weight(getFCWeight(weight_value)); + // Note: weight should really be an int but registerFont incorrectly uses an enum + QFont::Weight weight = QFont::Weight(weightFromFcWeight(weight_value)); double pixel_size = 0; - if (!scalable) { - int width = 100; - FcPatternGetInteger (fonts->fonts[i], FC_WIDTH, 0, &width); + if (!scalable) FcPatternGetDouble (fonts->fonts[i], FC_PIXEL_SIZE, 0, &pixel_size); - } bool fixedPitch = spacing_value >= FC_MONO; - QFont::Stretch stretch = QFont::Unstretched; + // Note: stretch should really be an int but registerFont incorrectly uses an enum + QFont::Stretch stretch = QFont::Stretch(stretchFromFcWidth(width_value)); QString styleName = style_value ? QString::fromUtf8((const char *) style_value) : QString(); QPlatformFontDatabase::registerFont(familyName,styleName,QLatin1String((const char *)foundry_value),weight,style,stretch,antialias,scalable,pixel_size,fixedPitch,writingSystems,fontFile); // qDebug() << familyName << (const char *)foundry_value << weight << style << &writingSystems << scalable << true << pixel_size; |