[vdr] How's the 24 bit OSD VDR coming?

Petri Hintukainen phintuka at users.sourceforge.net
Wed Mar 9 12:54:37 CET 2011


Klaus Schmidinger wrote:
> On 08.03.2011 22:31, Udo Richter wrote:
> > Am 08.03.2011 22:09, schrieb Klaus Schmidinger:
> >> Don't get too excited about the TrueColor OSD, though.
> >> What comes with VDR is only the basic OSD platform that
> >> allows plugins to use full screen 32 bit ARGB color,
> >> with alpha blendable pixmaps and such.
> > 
> > Do you have any numbers on OSD speed for, lets say, some prototype
> > output device you may have at hand?
> > 
> > An old-style 720x576x8 display has just 400k size, HD RGB32 however has
> > 6Mb. This could limit display update speed notably for animations or
> > video overlays using OSD. Would be nice to know how much is possible.
> 
> Sending the full screen OSD with 32 bit ARGB to the TT-S2 6400 takes
> roughly 500ms. Most of the time, though, only small portions of the
> screen are modified and need to be transferred to the hardware (or
> whatever device actually displays the OSD).

What kind of interface is provided to output device plugins ? It would
be nice if output devices could hook to the drawing primitives instead
of plain ARGB OSD plane.
When the output device is behind network, transferring just the
primitives would give huge speed gain (drawing background using filled
rectangle, drawing text using cached pixmaps etc.). Using derived
cBitmap class would allow preloading pixmaps so that those could be
transferred to the device memory in advance.


- Petri




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