(Информация о версии неизвестна, возможно, только в SVN)
CairoContent is used to describe the content that a surface will contain, whether color information, alpha information (translucence vs. opacity), or both.
Note: The large values here are designed to keep CairoContent values distinct from CairoContent values so that the implementation can detect the error if users confuse the two types.
CairoContent::COLOR
The surface will hold color content only.
CairoContent::ALPHA
The surface will hold alpha content only.
CairoContent::COLOR_ALPHA
The surface will hold color and alpha content.