coreboot-kgpe-d16/payloads
Hung-Te Lin d04b388381 libpayload: cbgfx: Support buffered I/O
For payloads with UI based on CBGFX, they usually start by calling
clear_canvas or clear_screen and then draw the UI elements. However,
that makes the screen flicker.

A typical solution is to identify and minimize the area to redraw.
However for payloads with complicated UI and do not care about latency,
an alternative is to enable buffered I/O.

The new enable_graphics_buffer() will redirect all graphics I/O
into an invisible working buffer. To flush (redraw) the buffer to the
real screen, call flush_graphics_buffer(). To stop buffering, call
disable_graphics_buffer().

BUG=None
TEST=Add the enable, flush and disable calls to payload 'depthcharge',
     built a firmware and boots into Chrome OS recover UI. No more
     flickering. The average rendering time on x86 platform is 1.2ms.

Change-Id: Id60a2824fd9e164feae16b92b68b003beabea8d3
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44654
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2020-08-28 21:40:58 +00:00
..
coreinfo libpayload: Cache physical location of CBMEM entries 2020-08-24 09:13:30 +00:00
external payloads/seabios: Update stable version to 1.14.0 2020-08-17 06:37:57 +00:00
libpayload libpayload: cbgfx: Support buffered I/O 2020-08-28 21:40:58 +00:00
linuxcheck treewide: Remove "this file is part of" lines 2020-05-11 17:11:40 +00:00
nvramcui payloads/nvramcui: Fix `make clean` 2020-08-18 10:24:01 +00:00
Kconfig arch/arm: Enable FIT payloads 2020-08-19 07:16:59 +00:00
Makefile.inc treewide: Remove "this file is part of" lines 2020-05-11 17:11:40 +00:00