We currently use ARGB8888 unconditionally, assuming it will be supported by all drivers. We should query the driver for the list of supported formats and modifiers and create the GBM buffer with modifiers to make sure the optimal format and modifier is used.
Pull request: https://github.com/WebKit/WebKit/pull/19213
Committed 269634@main (d3a9830bb678): <https://commits.webkit.org/269634@main> Reviewed commits have been landed. Closing PR #19213 and removing active labels.