CAIRO-FORMAT-A8:CAPS"></a>CAIRO_FORMAT_A8</p></td>
<td class="enum_member_description">
<p>each pixel is a 8-bit quantity holding
  an alpha value. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-A1:CAPS"></a>CAIRO_FORMAT_A1</p></td>
<td class="enum_member_description">
<p>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
  endian