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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