enum Cairo::Format

Overview

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

Defined in:

cairo/format.cr

Enum Members

Invalid = -1

No such format exists or is supported.

ARGB32 = 0

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.)

RGB24 = 1

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.

A8 = 2

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

A1 = 3

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.

RGB16_565 = 4

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.

RGB30 = 5

Like Format::RGB24 but with 10bpc.

Instance Method Summary

• #a1?
• #a8?
• #argb32?
• #invalid?
• #rgb16_565?
• #rgb24?
• #rgb30?
• #stride_for_width(width : Int32) : Int32

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

Instance Method Detail