[PATCH libdrm v2 01/10] util: Improve SMPTE color LUT accuracy

[Sam Ravnborg]

Hi Geert,

On Fri, Jul 08, 2022 at 08:21:31PM +0200, Geert Uytterhoeven wrote:
> Fill in the LSB when converting color components from 8-bit to 16-bit.
> 
> Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
> ---
> v2:
>   - New.
> ---
>  tests/util/pattern.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tests/util/pattern.c b/tests/util/pattern.c
> index 178aee8341a38920..3753ebc1eeae6c9a 100644
> --- a/tests/util/pattern.c
> +++ b/tests/util/pattern.c
> @@ -646,9 +646,9 @@ void util_smpte_c8_gamma(unsigned size, struct drm_color_lut *lut)
>  	memset(lut, 0, size * sizeof(struct drm_color_lut));
>  
>  #define FILL_COLOR(idx, r, g, b) \
> -	lut[idx].red = (r) << 8; \
> -	lut[idx].green = (g) << 8; \
> -	lut[idx].blue = (b) << 8
> +	lut[idx].red = (r) * 0x101; \

	(lut[idx].red = (r) << 8) | 1;

had IMO been easier to read.

Patch is:
Acked-by: Sam Ravnborg <sam at ravnborg.org>

for both ways to do it.


> +	lut[idx].green = (g) * 0x101; \
> +	lut[idx].blue = (b) * 0x101
>  
>  	FILL_COLOR( 0, 192, 192, 192);	/* grey */
>  	FILL_COLOR( 1, 192, 192, 0  );	/* yellow */
> -- 
> 2.25.1