Do not render parts of image not used for display

bmeaut / grainautline

GrainAutLine: image processing for geology and material sciences

GNU General Public License v3.0

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Do not render parts of image not used for display #86

Closed csorbakristof closed 8 years ago

csorbakristof commented 9 years ago

Use RoI calculated from Pan and Zoom (but that needs to take the automatic rendering out of the hand of QML), OR
instead of dirty flags, introduce invalidated region, so that the remaining parts can be cached.

csorbakristof commented 8 years ago

Everything is rendered, but cached. AuxDrawer redraws only the RoI, and ImageBlenderImage takes RoI also into account.

After these changes, there seems to be no direct reason to restrict rendering to visible area. (For that, we would need to render ourselves, currently, many things are done by QML.)