Re: [RFC weston 13/16] compositor: Add a function to test if images transformed by a matrix should be bilinearly filtered

[Bill Spitzak]

Actually the third column is irrelevant if you know the source is a flat 
plane at z=0, which is what the wayland buffers are.

So only 9 numbers in the matrix need to be examined:
 |sx 0  ? tx|
 |0  sy ? ty|
 |?  ?  ?  ?|
 |0  0  ?  1|

or

 |0  sx ? tx|
 |sy 0  ? ty|
 |?  ?  ?  ?|
 |0  0  ?  1|

sx and sy must be ±1, tx and ty must be integers.
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