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

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

--- Comment #21 from Konstantin <[email protected]> ---
> 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.

Yes, I have a different scale on the screens. Maybe it can be done so that the
screenshots don't get blurry? After all, the screenshot of the entire screen is
clear.

I agree that rescaling is unavoidable if the selected rectangle actually spans
outputs with different scale factors.

But I don't think it should be unavoidable when the rectangular selection is
entirely contained within a single output.

Could Spectacle detect that case and use the native capture of that output as
the source for the final image?

The combined/workspace image could still be used for the rectangular-selection
UI, but after the selection is confirmed:

determine whether the selection is fully contained in one output;
use that output's native-resolution screenshot;
transform the selection coordinates into that output's native pixel
coordinates;
crop it directly, without rescaling.

Only selections that actually intersect multiple outputs with different scale
factors would need the current stitching/rescaling path.

In my case, if a Full Screen capture of the 4K@125% output already has perfect
native quality, a rectangular selection entirely inside that same output should
theoretically be obtainable from exactly those same pixels.

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