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-Dirty marking and rendering
-
-Krita organizes layers in the form of a tree, with a grouplayer at the root:
-
-group1 == image->rootLayer()
-    layer2
-    layer3
-    layer4
-    group2
-        layer6
-        layer7
-        adjustmentlayer 1
-        layer9
-    group3
-        adjustmentlayer 2
-        layer10
-        layer11
-        group4
-            layer12
-            layer13
-
-
-In this example, group1 is the rootlayer; layer13 is group3 is shown topmost
-in the layerbox, with group4 right under that, and layer13 is the "highest"
-paint layer in the complete tree.
-
-Compositing
-
-At every group level, a projection layer caches the result of compositing
-the layerstack in a projection paint device. The cached projection is then
-composited with the layers of that level, etc, until everything is composited
-onto the projection or the root layer. The image does _not_ have a projection
-anymore.
-
-We composite from layer2 downwards onto the projection of rootLayer, group1.
-
-
-Dirty marking
-
-In order to do the least possible amount of work (which is very important,
-especially with large amounts of layers and adjustment layers), we keep track
-of which layer is dirty. Groups without dirty layers are not recomposited; this
-dirtiness of course travels upwards, meaning that the rootlayer will always be
-dirty.
-
-XXX: Should we keep a structure with dirty rects for every layer, so we
-can determine whether the changed rect in a layer is actually in the area
-we are recompositing? I don't think so, since we should always try to keep
-
-Adjustment layers also keep a copy of the result of their work; if in group 2,
-layer 9 is adjusted, we do not want to composite layer 6 and 7 and filter the
-result through adjustmentlayer 1; we want to composite the changes in layer 9
-directly onto the cached result of the adjustment layer.
-\ No newline at end of file