Follow-up Comment #1, bug #19732 (project mypaint):
Implementation strategy for initial porting:
1. Brush engine: Use a GeglBuffer to back the Surface API instead of
lib/tiledsurface.{hpp,py}
2. Document model: Let each Layer have a GeglNode representing that layer.
Compositing is done by a GEGL graph that combines these nodes together. This
removes the need for lib/pixelops.hpp and lib/composite_rgbx.hpp
3. Import/export: Use GEGL file operations like file-png and file-jpeg instead
of GdkPixbuf and lib/fastpng.hpp
4. Rendering: Use GeglGtkView from the gegl-gtk library instead of
gui/tileddrawwidget.py. Pass the GeglNode of the composited node to the
widget.
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