[mythtv] A couple of 16:9 questions and HDTV

Rick Weldon rick at nova.org
Sat Aug 30 01:36:15 EDT 2003

Okay, I'll answer my own post. Ignore my original drivel I should have just 
dug in the code first.

I think the fix for getting "round" icons on 16:9 format would be to "square" 
up the scaling so to speak. (sorry for the cheap pun)  In the mythcontext 
code I see where the scaling factors are set in  InitializeScreenSettings(). 

    m_wmult = width / 800.0;
    m_hmult = height / 600.0;
    m_screenwidth = width;
    m_screenheight = height;

m_wmult and m_hmult should be the same for 4:3 screens and different when 
dealing with wide screens with width larger. Good thing this, as its used in 
the layout calculations. But in the routines that scale the icons 
LoadScaleImage and LoadScalePixmap the width and height multipliers are 
different for the 16:9 case and shouldn't be. As is here:

 QImage tmp2 = tmpimage.smoothScale((int)(tmpimage.width() * wmult),
                                           (int)(tmpimage.height() * hmult));

my thought is to make the multiplier for both hmult. I believe this will give 
a round result instead of an oval for both 16:9 and 4:3 displays. As well as 
the right size icons.  I tried changing both to hmult and built and ran both 
resolutions and got correctly scaled icons. Will this work in all situations 
though?  If so the fix is trivial. Change wmult to hmult in the LoadScale 


On Friday 29 August 2003 08:34 pm, Rick Weldon wrote:
> Second I found the routines that do the pre-scaling for the interface icons
> and they seem to do nothing if the display is 800x600 and otherwise they
> calculate the scaling based on screen res. In my case that's 1368x720 which
> yields ovular icons. Again, whats the correct way to fix this or to take
> into consideration a non 4:3 display? My guess on choices would be A. to
> create icons that look right on a 16:9 format screen and detect that and
> use them or B. force a 4:3 scale and have the display realize it has more
> room for displaying the icons.  Am I even close here? Option A would mean
> 16x9 and 4x3 themes. ick. B sounds right, but I'm not sure.
> Also I ordered the pchdtv card 2 days ago. I can't wait till it gets here
> to play with it and test out the new code that supports this card.  I'll
> let folks know how it goes.
> Rick

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