Missing BMP 565RGB video support

[Trommel, Kees (Contractor)]

Anatolij,

> Did you define CONFIG_BMP_24BPP in your board config file?

Yes. Without this define the command "bmp display <addr>" does not do anything if the given BMP is a 24BPP BMP. With this define the a 24 BPP BMP I displayed but with wrong colors because the framebuffer of my (i.MX6) board expects 56RGB encoded colors.

The issue is that the video_priv struct  does not have sufficient information to describe all the properties of the associated framebuffer. Current it only knows the BPP (defined by the field bpix) but not the required encoding. This could be fixe to the video_fb.h "gdfIndex" rather than the video.h "bpix" in the video_priv struct.

Kees.

-----Original Message-----
From: Anatolij Gustschin [mailto:agust at denx.de]
Sent: 01 September 2020 13:08
To: Trommel, Kees (Contractor) <kees.trommel.contractor at draeger.com>
Cc: u-boot at lists.denx.de
Subject: Re: Missing BMP 565RGB video support

Hi,

On Fri, 28 Aug 2020 10:44:55 +0000
Trommel, Kees (Contractor) kees.trommel.contractor at draeger.com wrote:

> Hi Agust,
>
> The latest version of the U-Boot does not support conversion from
> 24BPP BMP to a 16BPP 565RGB encoded frame buffer. It uses always
> 555RGB encoding (see function video_bmp_display in video_bmp.c).
> Older versions of the U-Boot (e.g. 2015.04) supported this because the
> platform specific device driver passed not only the BPP but also the
> encoding.

in recent U-Boot we do not use old cfb_console driver which supported 24bpp bitmaps. The DM video console driver still dosn't support some framebuffer/bitmap BPP combinations, or maybe your board config file does not define CONFIG_BMP_24BPP.

> Do you know whether this lost support was done on purpose or lost by
> accident?

This is probably due to DM video conversion, not all BPP variants have been implemented with this yet.

> I encountered this issue when trying to display a 24BPP BMP splash
> screen at an i.MX6 platform.

Did you define CONFIG_BMP_24BPP in your board config file?
If not, could you do so and test the result? Thanks.

--
Anatolij
---
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