Allow selecting fonts with irregular style names

Fonts like "Helvetica Neue UltraLight" or "Skia Regular Black
Condensed" can't be selected in Qt because either they don't
report correct numeric values for weight/stretch/etc. or these
values are not mapped from QFont enums in a linear way. Thus
we provide a shortcut to select these fonts with PostScript
name or full name without resorting to family name matching in
QFontDatabase (these fonts are not registered in font database
anyway). After this, we can simply use:

    QFont font("Helvetica Neue");
    font.setStyleName("UltraLight");

to select these fonts. QCoreTextFontEngineMulti matched like
this can be created directly from the CTFontRef instance
instead of creating from the font name, making this process
faster.

The commit also cleaned up the font loading process in Mac
font database a bit, moving the code for family matching into
a separate function.

Add QFontInfo::styleName() and QRawFont::styleName() to access
the resolved style name for a font.

Task-number: QTBUG-19366
Change-Id: Iad07768c02ed06cc8d6b7395dec554384f410506
Reviewed-on: http://codereview.qt.nokia.com/333
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jiang Jiang <jiang.jiang@nokia.com>
(cherry picked from commit 97391be5ebddc62545ddb88f92fc2045bfa10711)

1 files changed, 50 insertions, 0 deletions

diff --git a/src/gui/text/qfont.cpp b/src/gui/text/qfont.cpp
index 90dd029..d4c81b9 100644
--- a/src/gui/text/qfont.cpp
+++ b/src/gui/text/qfont.cpp
@@ -348,6 +348,9 @@ void QFontPrivate::resolve(uint mask, const QFontPrivate *other)
     if (! (mask & QFont::FamilyResolved))
         request.family = other->request.family;
 
+    if (! (mask & QFont::StyleNameResolved))
+        request.styleName = other->request.styleName;
+
     if (! (mask & QFont::SizeResolved)) {
         request.pointSize = other->request.pointSize;
         request.pixelSize = other->request.pixelSize;
@@ -897,6 +900,38 @@ void QFont::setFamily(const QString &family)
 }
 
 /*!
+    \since 4.8
+
+    Returns the requested font style name, it will be used to match the
+    font with irregular styles (that can't be normalized in other style
+    properties). It depends on system font support, thus only works for
+    Mac OS X and X11 so far. On Windows irregular styles will be added
+    as separate font families so there is no need for this.
+
+    \sa setFamily() setStyle()
+*/
+QString QFont::styleName() const
+{
+    return d->request.styleName;
+}
+
+/*!
+    \since 4.8
+
+    Sets the style name of the font. When set, other style properties
+    like \a style() and \a weight() will be ignored for font matching.
+
+    \sa styleName()
+*/
+void QFont::setStyleName(const QString &styleName)
+{
+    detach();
+
+    d->request.styleName = styleName;
+    resolve_mask |= QFont::StyleNameResolved;
+}
+
+/*!
     Returns the point size of the font. Returns -1 if the font size
     was specified in pixels.
 
@@ -2509,6 +2544,21 @@ QString QFontInfo::family() const
 }
 
 /*!
+    \since 4.8
+
+    Returns the style name of the matched window system font on
+    system that supports it.
+
+    \sa QFont::styleName()
+*/
+QString QFontInfo::styleName() const
+{
+    QFontEngine *engine = d->engineForScript(QUnicodeTables::Common);
+    Q_ASSERT(engine != 0);
+    return engine->fontDef.styleName;
+}
+
+/*!
     Returns the point size of the matched window system font.
 
     \sa pointSizeF() QFont::pointSize()