gegl:recursive-transform-plus is an extension of
gegl:recursive-transform, allowing multiple transformations to be
applied simultaneously; it will eventually be merged back into
gegl:recursive-transform. See GEGL commit
9829bc22e85526d789c4e80c05949d4c6202a207.
The GUI uses the new TRANSFORM_GRIDS controller, allowing adding,
duplicating, and removing transformations, and controlling them
through on-canvas transform grids.
gegl:recursive-transform applies a transformation recursively to
an image. The custom GUI allows controlling the transformation
matrix using a transform-grid controller, added in the previous
commit.
Add a specialized propgui constructor for gegl:color-to-alpha-plus.
This op is currently in the workshop, but is set to be merged with
the existing gegl:color-to-alpha, so we omit the '-plus' from file-
and function-names.
The new op adds a pair of properties to control the radii, relative
to the selected color, below which colors become fully transparent,
and above which colors remain fully opaque. Allow these properties
to be set by picking a color from the image, and calculating the
radius accordingly.
