Re: High-DPI screenshot

[David Chisnall]

Very nice!  Also useful for accessibility, since it allows the user to magnify 
the display nicely.  I wonder if we could improve on that even more, creating a 
floating window that had a copy of the current view drawn into it at 2x 
magnification.

It would also be worth allowing -back to provide a default scale factor that 
can be overridden, since both X11 and Win32 provide mechanisms for 
interrogating the current display and finding the scale factor.

I wonder if you've thought about multi-monitor setups at all?  It's 
increasingly common to have a laptop with one resolution and an external 
display with another.  Ideally, you'd want windows to change their scale when 
they moved from one screen to another, so they retained the same overall size, 
but this is quite difficult to do in practice because you also have the case 
where windows are overlapping two displays.

To do this really nicely, you'd want -back (or Cairo) to have some sort of tee 
layer that could send display commands to two surfaces simultaneously, and then 
split the window into n different parts, with different drawing contexts 
rendering the differently scaled versions.  This would also need 
non-rectangular window support, so would be really messy to get right.  As a 
first approximation, however, just having the windows scale correctly when they 
were moved entirely from one screen to another would be nice.

David

On 12 Apr 2011, at 20:34, Eric Wasylishen wrote:

> Hey,
> Here's a screenshot of a patch I'm working on which scales the UI for high 
> DPI monitors - I think it's pretty cool :-)
> 
> It was surprisingly easy to implement. The actual scaling is done simply by 
> changing the bounds and frame rects in GSWindowDecorationView (no changes in 
> -back, and it works with cairo/art/xlib). You can set an arbitrary scale 
> factor via a GSScaleFactor user default. Other than that, there were just a 
> couple of bugs to fix to get it to work (and still some bugs remaining, but 
> it's at least usable.)
> 
> I'll commit this after the upcoming release.
> 
> Cheers,
> Eric
> 
> <highdpi.png>
> 
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