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The CairoFormat class

Einführung

CairoFormat enums are used to identify the memory format of the image data.

Klassenbeschreibung

CairoFormat

CairoFormat {

/* Konstanten */

const integer CairoFormat::ARGB32 = 0 ;

const integer CairoFormat::RGB24 = 1 ;

const integer CairoFormat::A8 = 2 ;

const integer CairoFormat::A1 = 3 ;

/* Methoden */

public static int strideForWidth ( int $format , int $width )

}

Vordefinierte Konstanten

CairoFormat Node Types

CairoFormat::ARGB32: Each pixel is a 32-bit quantity, with alpha in the upper 8 bits, then red, then green, then blue. The 32-bit quantities are stored native-endian. Pre-multiplied alpha is used. (That is, 50% transparent red is 0x80800000, not 0x80ff0000.)
CairoFormat::RGB24: Each pixel is a 32-bit quantity, with the upper 8 bits unused. Red, Green, and Blue are stored in the remaining 24 bits in that order.
CairoFormat::A8: Each pixel is a 8-bit quantity holding an alpha value.
CairoFormat::A1: Each pixel is a 1-bit quantity holding an alpha value. Pixels are packed together into 32-bit quantities. The ordering of the bits matches the endianess of the platform. On a big-endian machine, the first pixel is in the uppermost bit, on a little-endian machine the first pixel is in the least-significant bit.

Inhaltsverzeichnis

CairoFormat::strideForWidth — Provides an appropiate stride to use

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