Basically, I replaced all methods in the font_metrics namespace by a proper virtual interface FontMetrics. The FontLoader is _the_ container for FontMetrics.
This patch should also bring some optimizations in a number of place in the code. This is because we do not need any more to search for the LyXFont at each font_metrics call. In effect, the speed advantage is not as sensible and this is a bit deceiving considering that this was my primary motivation behind the patch. But I like the patch anyway as it cleans up the relation and interfacing between fonts, metrics and frontends.
* frontends/FontMetrics.h: new virtual interface. Renamed from font_metrics.h
* qt4/GuiFontMetrics: corresponding qt4 implememtation. Renamed from qfont_metrics.C. The smallCaps particular case treatment has been transfered here as well as the width cache for MacOSX and Windows.
* qt4/QLPainter.C: the smallCapsText has been reworked to return the width of the drawn text.C
all other files: replace font_metric helper function call with corresponding FontMetrics method calls.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15265 a592a061-630c-0410-9148-cb99ea01b6c8
* frontends/FontLoader.h: new interface class.
* frontends/Application.h: new FontLoader() pure virtual method
* frontends/lyx_gui: update_fonts() and font_available() methods deleted
* [qt3/qt4/gtk]/GuiApplication: implement the new interface
* qt4/GuiFontLoader:
- renamed from FontLoader
- now derives from FontLoader
- now in the lyx::frontend namespace
* qt3/qfont_loader
- now derives from FontLoader
* gtk/xftFontLoader
- now derives from FontLoader
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15220 a592a061-630c-0410-9148-cb99ea01b6c8
