This patch series implements a framebuffer rotation configuration option which
allows the user to specify a rotation translation to be applied to the video
output from grub, such that user can programatically rotate the display. This
enables grub to be used in nonstandard display mounting schemes such as
portrait mode.
Patch 1: dirty-2d - track and update 2d regions in the framebuffer. This
simplifies the implementation of the framebuffer rotation.
Patch 2: frambuffer rotation - numerous changes in the video_fb subsystem
to enable specifying render_target rotation.
Patch 3: enables setting the framebuffer rotation by setting
GRUB_FB_ROTATION in /etc/default/grub. NOTE. rotation is passed on to linux
unless GRUB_GFXPAYLOAD_LINUX = text
Status: Works as intended, however some optimizations(particularly in the
blitting functions) have been left for future implementation.
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