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This document uses PHP Chinese website manual Release
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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.