LCL on framebuffer (without X)
lazarus / 32-Linux

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pleumann · 2023-08-03 14:04

Hello,

is it possible to build a Lazarus app for a Linux (embedded) system
that does not run a full-blown X server? Can the LCL render directly
into the framebuffer?

Cheers
Joerg

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Thaddy · 2023-08-03 15:11

I only used the framebuffer directly with FPC on Raspberry Pie's.
(I wrote some demo's that are possibly still available from the RPI
websites somewhere, translated C code to Freepascal.)
But, probably, yes, although it might prove to be a mammoth task.
In effect writing a kind of X. But Possible.

A good starting point is possibly the custom drawn widget set.

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lagprogramming · 2023-08-03 18:16

Have a look at MSEide/MSEgui. For now it can't do that either but
compared to LCL's customdrawn, MSEgui is much closer to achieving
that.
https://github.com/mse-org/mseide-msegui
Unfortunately, at the moment, unlike LCL, MSEgui is not able to save
forms to bitmaps, which is something very important for MSEgui. Much
more important than it is for LCL.

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zeljko · 2023-08-03 19:16

Qt5 an qt6 ws should support framebuffer via platform integration
driver

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pleumann · 2023-08-06 11:12

Thanks for the responses!

The application already exists using LCL, so a complete rewrite using
a different UI library is probably not an option.

We'll have a look at the Qt and custom widgets options.

Google also got me some references to "GTK on frame buffer", but they
are all very old (like, 10 years or so). Is that still a thing or has
it ever been?