!Format class methodsFor:'documentation'!

documentation

"

    Cairo::Format is used to identify the memory format of image data.

    New entries may be added in future versions.

    Values

    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 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. (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)

    [author:]

        Jan Vrany <jan.vrany@fit.cvut.cz>

    [instance variables:]

    [class variables:]

    [see also:]

"

! !