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drm/sun4i: backend: Detail the YUV to RGB values coding explanation

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The values in the BT601 YUV to RGB colorspace translation are not
simply coded as multiples, but rather as fixed-point signed fractional
values on a given number of bits. Add an explanation about that.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181123092515.2511-24-paul.kocialkowski@bootlin.com
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Paul Kocialkowski 2018-11-23 10:24:55 +01:00 committed by Maxime Ripard
parent b636d3f97d
commit dc7d4b655a
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1 changed files with 6 additions and 2 deletions
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drivers/gpu/drm/sun4i/sun4i_backend.c
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@ -48,8 +48,12 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
/*
* These coefficients are taken from the A33 BSP from Allwinner.
*
* The formula is for each component, each coefficient being multiplied by
* 1024 and each constant being multiplied by 16:
* The first three values of each row are coded as 13-bit signed fixed-point
* numbers, with 10 bits for the fractional part. The fourth value is a
* constant coded as a 14-bit signed fixed-point number with 4 bits for the
* fractional part.
*
* The values in table order give the following colorspace translation:
* G = 1.164 * Y - 0.391 * U - 0.813 * V + 135
* R = 1.164 * Y + 1.596 * V - 222
* B = 1.164 * Y + 2.018 * U + 276