Quartz (CGFont) Fonts Font support via CGFont on OS X The Quartz font backend is primarily used to render text on Apple MacOS X systems. The CGFont API is used for the internal implementation of the font backend methods. #cairo_font_face_t Defined if the Quartz font backend is available. This macro can be used to conditionally compile backend-specific code. @font: @Returns: @font_id: @Returns: