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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">There is an other issue with systemLocked, it locks the entire layer, even if some area are now free for more processing. With a clever queue, it would be possible to know on which area an action needs to process. For instance, if we have a filter on the whole image and freehand stroke on a subpart of the image, as soon as the filter is finished with the subpart of the image, it will be possible to execute the freehand action, while the filter works on other area (and with a clever scheduler, you can give priority to that subpart).</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Second point, actions queue is the best solution for collaborative editing, since it would make collaborative editing as easy as adding an action on the queue of the node as soon as it is received.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Now I agree with Boudewijn and Sven, visual feedback when drawing is important, but it does not have to be accurate, for instance, for indirect painting (and paintop that do not needs layer data), we could keep the temporary layer and delay the merging, and for direct painting just show a line that represents the stroke.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">-- </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Cyrille Berger</p></body></html>