Store styleName in font database

So that queries like QFontDatabase::styles() can return exactly
the same styles as the system does. Then application can use
QFont::setStyleName() to select those styles later. With a lot
of fonts not providing correct numeric weight/width values and
even if they did, values are usually not directly mapped to
QFont enums, styleName is probably the only reliable way to
select any possible font in the system.

Reviewed-by: QTBUG-13518
Change-Id: Id8a9469b804f1b5bb81d8c7378e7e8778f9a4fff
Reviewed-on: http://codereview.qt.nokia.com/739
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

1 files changed, 31 insertions, 11 deletions

diff --git a/src/gui/text/qfontdatabase.cpp b/src/gui/text/qfontdatabase.cpp
index 1d07b567f8..2a73223da1 100644
--- a/src/gui/text/qfontdatabase.cpp
+++ b/src/gui/text/qfontdatabase.cpp
@@ -218,16 +218,17 @@ struct QtFontStyle
         Key(const QString &styleString);
         Key() : style(QFont::StyleNormal),
                 weight(QFont::Normal), stretch(0) { }
-        Key(const Key &o) : style(o.style),
+        Key(const Key &o) : styleName(o.styleName), style(o.style),
                               weight(o.weight), stretch(o.stretch) { }
+        QString styleName;
         uint style : 2;
         signed int  weight : 8;
         signed int stretch : 12;
 
         bool operator==(const Key & other) {
-            return (style == other.style &&
+            return styleName == other.styleName && style == other.style &&
                      weight == other.weight &&
-                     (stretch == 0 || other.stretch == 0 || stretch == other.stretch));
+                     (stretch == 0 || other.stretch == 0 || stretch == other.stretch);
         }
         bool operator!=(const Key &other) {
             return !operator==(other);
@@ -292,7 +293,7 @@ struct QtFontStyle
 };
 
 QtFontStyle::Key::Key(const QString &styleString)
-    : style(QFont::StyleNormal), weight(QFont::Normal), stretch(0)
+    : styleName(styleString), style(QFont::StyleNormal), weight(QFont::Normal), stretch(0)
 {
     weight = getFontWeight(styleString);
 
@@ -1139,6 +1140,12 @@ static QtFontStyle *bestStyle(QtFontFoundry *foundry, const QtFontStyle::Key &st
     for ( int i = 0; i < foundry->count; i++ ) {
         QtFontStyle *style = foundry->styles[i];
 
+        if (!styleKey.styleName.isEmpty() && styleKey.styleName == style->key.styleName) {
+            dist = 0;
+            best = i;
+            break;
+        }
+
         int d = qAbs( styleKey.weight - style->key.weight );
 
         if ( styleKey.stretch != 0 && style->key.stretch != 0 ) {
@@ -1532,7 +1539,8 @@ static QString styleStringHelper(int weight, QFont::Style style)
 */
 QString QFontDatabase::styleString(const QFont &font)
 {
-    return styleStringHelper(font.weight(), font.style());
+    return font.styleName().isEmpty() ? styleStringHelper(font.weight(), font.style())
+                                      : font.styleName();
 }
 
 /*!
@@ -1542,7 +1550,8 @@ QString QFontDatabase::styleString(const QFont &font)
 */
 QString QFontDatabase::styleString(const QFontInfo &fontInfo)
 {
-    return styleStringHelper(fontInfo.weight(), fontInfo.style());
+    return fontInfo.styleName().isEmpty() ? styleStringHelper(fontInfo.weight(), fontInfo.style())
+                                          : fontInfo.styleName();
 }
 
 
@@ -1793,8 +1802,12 @@ QStringList QFontDatabase::styles(const QString &family) const
         }
     }
 
-    for (int i = 0; i < allStyles.count; i++)
-        l.append(styleStringHelper(allStyles.styles[i]->key.weight, (QFont::Style)allStyles.styles[i]->key.style));
+    for (int i = 0; i < allStyles.count; i++) {
+        l.append(allStyles.styles[i]->key.styleName.isEmpty() ?
+                 styleStringHelper(allStyles.styles[i]->key.weight,
+                                   (QFont::Style)allStyles.styles[i]->key.style) :
+                 allStyles.styles[i]->key.styleName);
+    }
     return l;
 }
 
@@ -2017,9 +2030,16 @@ QFont QFontDatabase::font(const QString &family, const QString &style,
 
     if (!s) // no styles found?
         return QApplication::font();
-    QFont fnt(family, pointSize, s->key.weight);
-    fnt.setStyle((QFont::Style)s->key.style);
-    return fnt;
+    if (s->key.styleName.isEmpty()) {
+        QFont fnt(family, pointSize, s->key.weight);
+        fnt.setStyle((QFont::Style)s->key.style);
+        return fnt;
+    } else {
+        // found a perfect match
+        QFont fnt(family, pointSize);
+        fnt.setStyleName(s->key.styleName);
+        return fnt;
+    }
 }