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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.