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clients/simple-dmabuf-egl: drop Y_INVERT flag

Simon Ser requested to merge emersion/weston:simple-dmabuf-egl-y-invert into main

The motivations for this are:

  • Y_INVERT is not used by real-world clients. weston-simple-dmabuf-egl is the only known user. Thus this creates a special case just for a demo client.
  • Some compositors (wlroots) have dropped support for DMA-BUF flags, so the client no longer runs there.
  • Dropping the flag allows compositors to use a KMS hardware plane to display the buffer.

Instead of trying to maintain the previous visual appearance, let's just leave it as-is since it doesn't really matter that the animation bounces between the two opposite corners.

Closes: #675 (closed)

Edited by Simon Ser

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