The CairoContent class

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簡介

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.

類別摘要

CairoContent {

/* 常數 */

const integer COLOR = 4096 ;

const integer ALPHA = 8192 ;

const integer COLOR_ALPHA = 12288 ;

}

預設常數

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.

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