libpayload: cbgfx: Replace bilinear resampling with Lanczos

This patch improves the image resampling (scaling) code in CBGFX to use
the Lanczos algorithm that is widely considered the "best" resampling
algorithm (e.g. also the first choice in Python's PIL library). It is of
course much more elaborate and therefore slower than bilinear
resampling, but a lot of the difference can be made up with
optimizations, and the resulting code was found to still produce
acceptable speeds for existing Chrome OS UI use cases (on an Arm
Cortex-A55 device, time to scale an image to 1101x593 went from ~88ms to
~275ms, a little over 3x slowdown). Nevertheless, if this should be too
slow for anyone there's also an option to tune it down a little, but
still much better than bilinear (same operation was ~170ms with this).

Example images (scaled up by a factor of 7):
Old (bilinear): https://i.imgur.com/ytr2n4Z.png
New (Lanczos a=3): https://i.imgur.com/f0vKluM.png

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Idde6f61865bfac2801ee4fff40ac64e4ebddff1a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42792
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

payloads/libpayload/Kconfig

@@ -334,6 +334,19 @@ config FONT_SCALE_FACTOR
 	  By default (value of 0), the scale factor is automatically
 	  calculated to ensure at least 130 columns (when possible).
 
+config CBGFX_FAST_RESAMPLE
+	bool "CBGFX: use faster (less pretty) image scaling"
+	default n
+	help
+	  When payloads use the CBGFX library to draw .BMPs on the screen,
+	  they will be resampled with an anti-aliasing filter to scale to the
+	  requested output size. The default implementation should normally be
+	  fast enough, but if desired this option can make it about 50-100%
+	  faster at the cost of quality. (It changes the 'a' parameter in the
+	  Lanczos resampling algorithm from 3 to 2.)
+
+	  Only affects .BMPs that aren't already provided at the right size.
+
 config PC_I8042
 	bool "A common PC i8042 driver"
 	default y if PC_KEYBOARD || PC_MOUSE