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gl-renderer: Assume axis alignment using node's valid_transform

Loïc Molinari requested to merge molinari/weston:improve_axis_alignment_test into main

Version 1

Derive axis alignment directly from the quad instead of relying on the transform flags of the weston_view struct. This is more reliable since matrix flags could erroneously hang around after a series of transforms. The axis alignment test now also includes rectangles rotated by multiples of 90°.

Version 2

Assume axis alignment using node's valid_transform boolean instead of relying on the transform flags of the weston_view struct. This is more reliable since matrix flags could erroneously hang around after a series of transforms. Additionally, nodes with standard output transforms like translations, flips and rotations by 90° can now take the fast axis aligned path.

Edited by Loïc Molinari

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