Cairo::Format

No such format exists or is supported.

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.)

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.

Each pixel is a 8-bit quantity holding an alpha value.

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.

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.

Like Format::RGB24 but with 10bpc.

Returns true if this enum value equals A1

Returns true if this enum value equals A8

Returns true if this enum value equals ARGB32

Returns true if this enum value equals Invalid

Returns true if this enum value equals RGB16_565

Returns true if this enum value equals RGB24

Returns true if this enum value equals RGB30

This function provides a stride value that will respect all alignment requirements of the accelerated image-rendering code within cairo.

###Parameters

• width The desired width of an image surface to be created.

###Returns The appropriate stride to use given the desired format and width, or -1 if either the format is invalid or the width too large.