Fixed an issue with text drawing to QImages on Mac/Cocoa.
Fixed an issue with text drawing to QImages on Mac/Cocoa.

We currently don't support subpixel hinting when drawing text to a
QImage on Mac. The alpha map that is returned by the font engine
is a plain 8 bit gray mask, which means we have to switch off subpixel
hinting when we draw the glyph for caching.

Task-number: 249178
Reviewed-by: Samuel

RLovelett/qt,KDE/qt,pruiz/wkhtmltopdf-qt,radekp/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,RLovelett/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,KDE/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,radekp/qt,radekp/qt,RLovelett/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,KDE/qt,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,radekp/qt,igor-sfdc/qt-wk,radekp/qt,igor-sfdc/qt-wk,KDE/qt,radekp/qt,RLovelett/qt,radekp/qt,igor-sfdc/qt-wk,KDE/qt,KDE/qt,RLovelett/qt,KDE/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,igor-sfdc/qt-wk,radekp/qt,RLovelett/qt,KDE/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,RLovelett/qt,pruiz/wkhtmltopdf-qt