#cairo_format_t is used to identify the memory format of image data.

cairo_format_t

Format

An object of class list of length 9.

Details

New entries may be added in future versions.

Since: 1.0

CAIRO_FORMAT_INVALID

no such format exists or is supported.

CAIRO_FORMAT_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.) (Since 1.0)

CAIRO_FORMAT_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. (Since 1.0)

CAIRO_FORMAT_A8

each pixel is a 8-bit quantity holding an alpha value. (Since 1.0)

CAIRO_FORMAT_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 endianness 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. (Since 1.0)

CAIRO_FORMAT_RGB16_565

each pixel is a 16-bit quantity with red in the upper 5 bits, then green in the middle 6 bits, and blue in the lower 5 bits. (Since 1.2)

CAIRO_FORMAT_RGB30

like RGB24 but with 10bpc. (Since 1.12)

CAIRO_FORMAT_RGB96F

3 floats, R, G, B. (Since 1.17.2)

CAIRO_FORMAT_RGBA128F

4 floats, R, G, B, A. (Since 1.17.2)

See also