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Thank you, this is a great idea. I like it so much, I think it's the perfect approach to panning (and rotation, maybe zoom). I think I'll try that in the PDF viewer. Since we have no pressed finger, probably a lazy grayscale repaint is in order. (And thanks for the pointer to the Hessian matrix!)
Sorry for bringing this thread somewhat further OT, but it will be a nice knowledge source for "doing fast updates" on e-ink in the future :-)
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