I've been tinkering with code for moving the current layer around recently:

http://gitorious.org/~achadwick/mypaint/achadwick-mypaint/commits/move-layer-experiments

Does this seem useful, and do the abstractions seem sane to people
from a coding/design perspective? I think the implementation basically
works, and it's about as fast as it's going to get without hacking
around with mipmap layers and rounding to make that work sensibly.

Use case 1: primarily when sketching. Someone has sketched an object
on a new layer but the composition is off slightly. Rather than erase
and redraw, it is sometimes helpful to just move the layer then fix up
any local perspective issues.

Use case 2: effect overlay layers. It's nice to be able to move
glints, shadows, glows and other bling around to see what effect that
has.

-- 
Andrew Chadwick

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