How to tell HDR panels from chrome:\\gpu ?

[Sushanth Rajasankar]

I am wondering if information about HDR is available in from the chrome:\\gpu page.

For example, I see

Display(s) Information

Info	Display[2528732444] bounds=[0,0 1920x1080], workarea=[0,0 1920x1040], scale=1, rotation=0, panel_rotation=0 external.
Color space (sRGB/no-alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (sRGB/no-alpha)	BGRX_8888
Color space (sRGB/alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (sRGB/alpha)	BGRA_8888
Color space (WCG/no-alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (WCG/no-alpha)	BGRX_8888
Color space (WCG/alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (WCG/alpha)	BGRA_8888
Color space (HDR/no-alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (HDR/no-alpha)	BGRX_8888
Color space (HDR/alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (HDR/alpha)	BGRA_8888
SDR white level in nits	80
Bits per color component	8
Bits per pixel	24
Refresh Rate in Hz	59

Should I see something else in the Color Space entries if my monitor supported HDR or EDR ?

Also is there a decoder ring for the number that follows Display - "Display[2528732444]" ?

Thanks,

Sushanth

[Dale Curtis]

If your display is configured for HDR you'll see something like this:

Display(s) Information

Info	Display[2528732444] bounds=[2195,0 2195x1235], workarea=[2195,0 2195x1235], scale=1.75, rotation=0, panel_rotation=0 external.

Color space (sRGB/no-alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (sRGB/no-alpha)	BGRX_8888
Color space (sRGB/alpha)	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Buffer format (sRGB/alpha)	BGRA_8888

Color space (WCG/no-alpha,WCG/alpha,HDR/no-alpha,HDR/alpha)	{primaries:BT709, transfer:LINEAR_HDR (slope 0.3333, SDR white point 240.0000 nits), matrix:RGB, range:FULL}
Buffer format (WCG/no-alpha,WCG/alpha,HDR/no-alpha,HDR/alpha)	RGBA_F16

SDR white level in nits

240
Bits per color component	10
Bits per pixel	30
Refresh Rate in Hz	60

[Sushanth Rajasankar]

Thank you Dale, that answers it for me. 👍

---

From: Dale Curtis <dalec...@chromium.org>
Sent: Monday, October 5, 2020 1:51 PM
To: Sushanth Rajasankar <Sushanth....@microsoft.com>
Cc: Graphics-dev <graphi...@chromium.org>
Subject: [EXTERNAL] Re: [Graphics-Dev] How to tell HDR panels from chrome:\\gpu ?