Messages in this thread |  | | Subject | Re: [PATCH v5] drm/fb-helper: pass physical dimensions to fbdev | From | David Lechner <> | Date | Sat, 5 Aug 2017 10:57:50 -0500 |
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On 08/04/2017 04:53 PM, Laurent Pinchart wrote: > Hi David, > > Thank you for the patch. > > On Friday 04 Aug 2017 11:25:24 David Lechner wrote: >> The fbdev subsystem has a place for physical dimensions (width and height >> in mm) that is readable by userspace. Since DRM also knows these >> dimensions, pass this information to the fbdev device. > > I'm curious, what's your use case for this ? What userspace software do you > use that is still based on fbdev and needs screen dimensions ?
I have dug up an old graphics library called GRX[1] and modernized it[2]. So, I am using the screen dimensions to make it DPI-aware so that the font on my 2.4" screen looks the same size as my 2.8" screen when both are 320x240 pixels. Until this year, all of the displays I have only have fbdev drivers.
[1]: http://grx.gnu.de [2]: https://github.com/ev3dev/grx
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