nsIFontEnumerator Interface

 Return a sorted array of the names of all installed fonts.

 @param  aCount     returns number of names returned
 @param  aResult    returns array of names
 @return void

void EnumerateAllFonts(out PRUint32 aCount, [array, retval, size_is(aCount)] out wstring aResult)

 Return a sorted array of names of fonts that support the given language
 group and are suitable for use as the given CSS generic font.

 @param  aLangGroup language group
 @param  aGeneric   CSS generic font
 @param  aCount     returns number of names returned
 @param  aResult    returns array of names
 @return void

void EnumerateFonts(in string aLangGroup, in string aGeneric, out PRUint32 aCount, [array, retval, size_is(aCount)] out wstring aResult)

    @param  aLangGroup language group
    @return bool do we have a font for this language group

void HaveFontFor(in string aLangGroup, [retval] out boolean aResult)

 @param  aLangGroup language group
 @param  aGeneric CSS generic font
 @return suggested default font for this language group and generic family

wstring getDefaultFont(in string aLangGroup, in string aGeneric)

 update the global font list
 return true if font list is changed

boolean updateFontList()