php man page for cairoformat

CAIROFORMAT(3)								 1							    CAIROFORMAT(3)

The CairoFormat class

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

CLASS SYNOPSIS
       CairoFormat

       CairoFormat

       Constants

       o const integer$CairoFormat::ARGB320

       o const integer$CairoFormat::RGB241

       o const integer$CairoFormat::A82

       o const integer$CairoFormat::A13

       Methods

       o publicstatic int CairoFormat::strideForWidth (int  $format, int  $width)

PREDEFINED CONSTANTS
	      o 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.)

	      o CairoFormat::RGB24 - Each pixel is a 32-bit quantity, with the upper 8 bits unused. Red, Green, and Blue are stored in the remain-
		ing 24 bits in that order.

	      o CairoFormat::A8 -Each pixel is a 8-bit quantity holding an alpha value.

	      o 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.

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