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We're already OpenGL-dependent in the compositor. All this does is expand the set of GL features we use a bit.

I was thinking more about passing the reference test suites. Or in the case this case failing since GPUs won't all render identically.

We still need a headless GL compositor even today to pass the reftests. The only way to composite layers together is GL. (This will probably change when we support printing though.)

> The only way to composite layers together is GL. (This will probably change when we support printing though.)

If not for the (very reasonable) expectation that things like "print to PDF" should produce vectors and selectable text rather than raster images of pages, you could render pages for printing using GL, too.

Yeah, I mainly mean PDF output here.

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