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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 4.8.0
Affects Version/s: 4.7.1
Component/s: GUI: Font handling
Labels:
None
Environment:
Tested on OS X 10.6 carbon and cocoa builds of Qt.

Platform/s:

macOS
Commits:
c501403cb5a0c9ec21b00e0c2f640ae85566e0cf

Description

Qt doesn't seem to check if all the characters in a string are of the requested font.

This results in incorrect display of characters that are higher in the substituted font than the selected font.

This is a problem for a number of common fonts, for example helvetica, when trying to show combined latin and CJK characters results in clipping of the non latin characters, as shown in example below:

#include <QtGui>

class W : public QWidget{

public:
    W(){
        layout = new QVBoxLayout;
        l1 = new QLabel(QString::fromUtf8("OK 書体"));
        l1->setFont(QFont("Lucida Grande",24));

        layout->addWidget(l1);

        l2 = new QLabel(QString::fromUtf8("Not OK 書体"));
        l2->setFont(QFont("Helvetica",24));
        layout->addWidget(l2);
        setLayout(layout);
    })
private:
    QVBoxLayout *layout;
    QLabel * l1;
    QLabel * l2;
};

int main( int argc, char** argv )
{
    QApplication app( argc, argv );

    W w;
    w.show();

    return app.exec();
}