Add gimp_plugin_enable_precision() in libgimp which switches the
plug-in to deal with the drawables' real precision, call it from the
libgimp GeglBuffer and Babl format APIs. If it's not enabled, let the
core's plug-in convert the tiles to legacy formats when sending them
over the wire.
GIMP was doing evil hacks lying to GEGL about it's pixels being in a linear
color space when they are not. This causes incorrect rendering, makes gaussian
blur misbehave etc.
The legacy projection modes should be implemented using the same 2.2 gamma
formats that are correct to specify for sRGB data. (for proper color
management in higher bitdepths; icc backend babl formats should be used.)
For the old image modes correct babl formats are:
R'G'B'A u8 - 8 bit RGB with 2.2 gamma (sRGB) with linear alpha component
R'G'B' u8 - 8 bit RGB with 2.2 gamma (sRGB)
Y'A u8 - 8 bit Grayscale with 2.2 gamma with linear alpha component
Y' u8 - 8 bit Grayscale with 2.2 gamma
Y u8 - 8 bit linear data, used for masks/channels
A u8 - 8 bit linear alpha
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RGBA float - 32bit floating point linear light RGB
RaGaBaA float - 32bit floating point linear light RGB, premultiplied alpha
to be used for processing that needs to scale by the alpha,
(blurs, resampling etc)
R'G'B'A float - 32bit floating point sRGB with gamma, to be used where
the result depends on being closer to perceptual when
processing, can be used a cheaper alternative to CIE Lab
based modes.
-----------------------------------------------
The legacy layer modes should use the formats with gamma 2.2 only for loading
and rendering legacy XCF files correctly, in the brave new world compositing
should most likely be done in linear light with "RGBA float" and even better
"RaGaBaA float" like GEGL does for porter duff and other compositing modes.
The ability to chose the legacy layer modes should probably be hidden from the
user unless an old .xcf has been opened.
Apply heavily modified patch from Es Swartz which adds PDB API for
brush size, angle and aspect ratio, as well as a full interface for
ink. Changed to patch to add all procedures to the "context" group
instead of creating new PDB groups, properly use the new
GimpPDBContext APIs for paint options, and did some general cleanup.
(Warning, completely untested).
Make gimp_image_get_uri() and gimp_image_get_filename() behave as in
the GIMP 2.6 days. Add new functions gimp_image_get_xcf_uri(),
gimp_image_get_exported_uri() and gimp_image_get_imported_uri().
