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Fontset
[GUI API]

A fontset is an object that maps a character to fonts. More...

Functions
MFontset *	mfontset (char *name)
	Return a fontset.
MSymbol	mfontset_name (MFontset *fontset)
	Return the name of a fontset.
MFontset *	mfontset_copy (MFontset *fontset, char *name)
	Make a copy of a fontset.
int	mfontset_modify_entry (MFontset *fontset, MSymbol script, MSymbol language, MSymbol charset, MFont *spec, MSymbol layouter_name, int how)
	Modify the contents of a fontset.
MPlist *	mfontset_lookup (MFontset *fontset, MSymbol script, MSymbol language, MSymbol charset)
	Lookup a fontset.

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Detailed Description

A fontset is an object of the type MFontset. When drawing an M-text, a fontset provides rules to select a font for each character in the M-text according to the following information.

• The script character property of a character.
• The language text property of a character.
• The charset text property of a character.

The documentation of mdraw_text() describes how that information is used.

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Function Documentation

MFontset * mfontset

(

char *

name

)

The mfontset() function returns a pointer to a fontset object of name name. If name is NULL, it returns a pointer to the default fontset.

If no fontset has the name name, a new one is created. At that time, if there exists a data <fontset, name> in the m17n database, the fontset contents are initialized according to the data. If no such data exists, the fontset contents are left vacant.

The macro M17N_INIT() creates the default fontset. An application program can modify it before the first call of mframe().

Return value:

This function returns a pointer to the found or newly created fontset.

MSymbol mfontset_name

(

MFontset *

fontset

)

The mfontset_name() function returns the name of fontset fontset.

MFontset * mfontset_copy	(	MFontset *	fontset,
		char *	name
	)

The mfontset_copy() function makes a copy of fontset fontset, gives it a name name, and returns a pointer to the created copy. name must not be a name of existing fontset. In such case, this function returns NULL without making a copy.

int mfontset_modify_entry	(	MFontset *	fontset,
		MSymbol	script,
		MSymbol	language,
		MSymbol	charset,
		MFont *	spec,
		MSymbol	layouter_name,
		int	how
	)

The mfontset_modify_entry() function associates, in fontset fontset, a copy of font with the script / language pair or with charset.

Each font in a fontset is associated with a particular script/language pair, with a particular charset, or with the symbol Mnil. The fonts that are associated with the same item make a group.

If script is not Mnil, it must be a symbol identifying a script. In this case, language is either a symbol identifying a language or Mnil, and font is associated with the script / language pair.

If charset is not Mnil, it must be a symbol representing a charset object. In this case, font is associated with that charset.

If both script and charset are not Mnil, two copies of font are created. Then one is associated with the script / language pair and the other with that charset.

If both script and charset are Mnil, font is associated with Mnil. This kind of fonts are called fallback fonts.

The argument how specifies the priority of font. If how is positive, font has the highest priority in the group of fonts that are associated with the same item. If how is negative, font has the lowest priority. If how is zero, font becomes the only available font for the associated item; all the other fonts are removed from the group.

If layouter_name is not Mnil, it must be a symbol representing a flt (font layout table). In that case, if font is selected for drawing an M-text, that font layout table is used to generate a glyph code sequence from a character sequence.

Return value:

If the operation was successful, mfontset_modify_entry() returns 0. Otherwise it returns -1 and assigns an error code to the external variable merror_code.

Errors:

MERROR_SYMBOL

MPlist * mfontset_lookup	(	MFontset *	fontset,
		MSymbol	script,
		MSymbol	language,
		MSymbol	charset
	)

The mfontset_lookup() function lookups fontset and returns a plist that describes the contents of fontset corresponding to the specified script, language, and charset.

If script is Mt, keys of the returned plist are script name symbols for which some fonts are specified and values are NULL.

If script is a script name symbol, the returned plist is decided by language.

• If language is Mt, keys of the plist are language name symbols for which some fonts are specified and values are NULL. A key may be Mt which means some fallback fonts are specified for the script.

• If language is a language name symbol, the plist is a FONT-GROUP for the specified script and language. FONT-GROUP is a plist whose keys are FLT (FontLayoutTable) name symbols (Mt if no FLT is associated with the font) and values are pointers to MFont.

• If language is Mnil, the plist is fallback FONT-GROUP for the script.

If script is Mnil, the returned plist is decided as below.

• If charset is Mt, keys of the returned plist are charset name symbols for which some fonts are specified and values are NULL.

• If charset is a charset name symbol, the plist is a FONT-GROUP for the charset.

• If charset is Mnil, the plist is a fallback FONT-GROUP.

Return value:

It returns a plist describing the contents of a fontset. The plist should be freed by m17n_object_unref().

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