[Linux-fbdev-devel] Re: New logo code

[Geert U. <ge...@li...>]

On Sun, 12 Jan 2003, Geert Uytterhoeven wrote:
> The current logo code is messy, complex, and inflexible. So I decided to
> rewrite it. My goals were:
>   - Logos must be accessible easily by an image editor (currently: hex C source
>     data must be converted to another format first)
>   - Logos must be stored in ASCII-form in the source tree
>   - Support arbitrary logo sizes (currently: fixed 80x80)
>   - Allow the logo to be selected statically (at compile time) and/or
>     dynamically (at run-time, based on machine type) (currently: at compile
>     time only).
>   - Allow simple adition of new logos
>   - Support grayscale logos (not used yet)
> 
> The patch achieves all of these. Logos are stored in ASCII PNM format in
> drivers/video/logo/, and automatically converted to hex C source arrays using
> scripts/pnmtologo. I chose ASCII PNM because (a) it's ASCII, (b) it's very
> simple to parse without an external library (XPM is more difficult to parse),
> and (c) it can be handled by many image manipulation programs.
> 
> Code that wants to display a logo just calls fb_find_logo(), specifying the
> wanted logo type, and receives a pointer to a suitable logo (or NULL).
> 
> I also modified fb_show_logo() to return the number of scanlines that are used
> by the logo, so fbcon knows how many lines to reserve.
> 
> So far I tested it on Amiga only (with amifb), using the standard 3 logos
> (mono, vga16, and clut224, all 80x80), and using resized (171x171) versions of
> the standard logos, to verify that arbitrary logo sizes are working.
> 
> Initial logo display is still a bit weird, because fbcon is initialized before
> the logo is drawn. What you see is this:
>   - Initial text screen contents are drawn, starting at the top of the screen,
>   - The logo is drawn,
>   - New kernel messages are printed, until the bottom of the screen is reached,
>   - The logo is drawn again, and the top of the screen is reserved for the
>     logo,
>   - New kernel messages are printed, and scrolling scrolls the text part only,
>     leaving the logo at the top
> 
> To do:
>   - More testing
>   - Clean ups:
>       o Protect all drawing code by CONFIG_FB_LOGO
>       o Move logo drawing code from fbmem.c to logo/logo.c?
>       o Logo selection in Kconfig and logo.c?

I put a new version at

    http://home.tvd.be/cr26864/Linux/fbdev/linux-logo-2.5.59.diff.bz2

Changes:
  - Merge with 2.5.59
  - New logo (CLUT224 only) for PA-RISC
  - Let hgafb and newport_con include logo sources directly, since they need
    access to the logos in non-init code

All comments are welcomed! Thanks!

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds