PHP - Manual: CairoFontType
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CairoFontType class is an abstract final class that contains constants used to describe the type of a given CairoFontFace or CairoScaledFont. The font types are also known as "font backends" within cairo.
The type of a CairoFontFace is determined by the how it is created, an example would be the CairoToyFontFace::__construct(). The CairoFontFace type can be queried with CairoFontFace::getType() or cairo_font_face_get_type()
The various CairoFontFace functions can be used with a font face of any type.
The type of a CairoScaledFont is determined by the type of the CairoFontFace passed to CairoScaledFont::__construct() or cairo_scaled_font_create(). The scaled font type can be queried with CairoScaledFont::getType() or cairo_scaled_font_get_type().
The font was created using CairoToyFont api
The font is of type CairoFreeType
The font is of type Win32
The font is of type Quartz
The font was create using cairo's user font api