WithCacheLimit sets the maximum number of cached glyphs.

A value of 0 disables the cache limit.

func WithCacheLimit(n int) SourceOption {
	return func(c *sourceConfig) {
		c.cacheLimit = n
	}
}

WithCollectionIndex selects a font within a TrueType/OpenType collection

(.ttc/.otc). Index 0 is the first font (default). Ignored for single fonts.

 

Example: msyh.ttc contains Microsoft YaHei (0) and Microsoft YaHei UI (1).

func WithCollectionIndex(index int) SourceOption {
	return func(c *sourceConfig) {
		c.collectionIndex = index
	}
}

WithDirection sets the text direction for the face.

func WithDirection(d Direction) FaceOption {
	return func(c *faceConfig) {
		c.direction = d
	}
}

WithHinting sets the hinting mode for the face.

func WithHinting(h Hinting) FaceOption {
	return func(c *faceConfig) {
		c.hinting = h
	}
}

WithLanguage sets the language tag for the face (e.g., "en", "ja", "ar").

func WithLanguage(lang string) FaceOption {
	return func(c *faceConfig) {
		c.language = lang
	}
}

WithParser specifies the font parser backend.

The default is "ximage" which uses golang.org/x/image/font/opentype.

 

Custom parsers can be registered with RegisterParser.

This allows using alternative font parsing libraries or

a pure Go implementation in the future.

func WithParser(name string) SourceOption {
	return func(c *sourceConfig) {
		c.parserName = name
	}
}