[Spectacle] [Bug 516970] After I bought a 4k monitor, all the screenshots became blurry.

https://bugs.kde.org/show_bug.cgi?id=516970

--- Comment #20 from Noah Davis <[email protected]> ---
(In reply to Konstantin from comment #19)
> Read the message above and this.
> 
> I suggest making Rectangular Region use the same native-resolution capture
> path as Full Screen.
> 
> Instead of asking the backend/compositor to capture the selected region
> separately, capture the screen at native physical resolution first, convert
> the selected rectangle from logical coordinates to physical pixel
> coordinates, and crop the resulting image with QImage::copy().
> 
> There should be no scaling or resampling involved.
> 
> For example, at 125% scaling, an 800×400 logical-pixel selection should
> correspond to a 1000×500 crop from the native screenshot:
> 
> 800 × 1.25 = 1000
> 
> 400 × 1.25 = 500
> 
> This would guarantee that Rectangular Region contains exactly the same
> pixels as the corresponding area of a Full Screen screenshot.

This actually is what Spectacle does. If both screens have the same scale,
there shouldn't be any re-scaling within Spectacle, as far as I can recall.
It's only when there are multiple screen scales that rescaling becomes
inevitable.

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