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#!/usr/bin/env python3
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import gi
gi.require_version('Gimp', '3.0')
from gi.repository import Gimp
from gi.repository import GObject
from gi.repository import GLib
from gi.repository import Gio
import sys
def N_(message): return message
def _(message): return GLib.dgettext(None, message)
def make_gradient(palette, num_segments, num_colors):
# name the gradient same as the source palette
# For now, the name of a resource is the same as the ID
palette_name = palette.get_name()
gradient = Gimp.Gradient.new(palette_name)
# assert gradient is valid but is has only one segment
assert gradient.get_number_of_segments() == 1
# split one segment into desired count
# index is zero-based
gradient.segment_range_split_uniform(0, 0, num_segments)
palette_colors = palette.get_colors()
for color_number in range(0, num_segments):
if color_number == num_colors - 1:
color_number_next = 0
else:
color_number_next = color_number + 1
color_left = palette_colors[color_number]
color_right = palette_colors[color_number_next]
gradient.segment_set_left_color(color_number, color_left)
gradient.segment_set_right_color(color_number, color_right)
# Side effects on the context. Probably not what most would expect.
Gimp.context_set_gradient(gradient)
return gradient
def run(procedure, config, data):
# Get the parameters
run_mode = config.get_property("run-mode")
if run_mode == Gimp.RunMode.INTERACTIVE:
gi.require_version('GimpUi', '3.0')
from gi.repository import GimpUi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
GimpUi.init(procedure.get_name())
dialog = GimpUi.ProcedureDialog(procedure=procedure, config=config)
# Add palette button
config.set_property("palette", None)
dialog.fill (["palette"])
if not dialog.run():
dialog.destroy()
return procedure.new_return_values(Gimp.PDBStatusType.CANCEL, GLib.Error())
dialog.destroy()
palette = config.get_property("palette")
if palette is None or not palette.is_valid():
if palette is not None:
sys.stderr.write(f'Invalid palette id: {palette.get_id()}\n')
sys.stderr.write('This should not happen. Please report to GIMP project.\n')
sys.stderr.write('Falling back to context palette instead.\n')
palette = Gimp.context_get_palette()
config.set_property("palette", palette)
num_colors = palette.get_color_count()
if procedure.get_name() == 'python-fu-palette-to-gradient':
num_segments = num_colors - 1
else: # 'python-fu-palette-to-gradient-repeating'
num_segments = num_colors
gradient = make_gradient(palette, num_segments, num_colors)
# XXX: for the error parameter, we want to return None.
# Unfortunately even though the argument is (nullable), pygobject
# looks like it may have a bug. So workaround is to just set a
# generic GLib.Error() since anyway the error won't be process with
# GIMP_PDB_SUCCESS status.
# See pygobject#351
retval = procedure.new_return_values(Gimp.PDBStatusType.SUCCESS, GLib.Error())
# XXX: I don't try to get the GValue with retval.index(1) because it
# actually return a string (cf. pygobject#353). Just create a new
# GValue and replace the default one with this one.
# This comment dates from when resources are strings:
# value = GObject.Value(GObject.TYPE_STRING, gradient)
value = GObject.Value(Gimp.Gradient, gradient)
retval.remove(1)
retval.insert(1, value)
return retval
class PaletteToGradient (Gimp.PlugIn):
## GimpPlugIn virtual methods ##
def do_set_i18n(self, procname):
return True, 'gimp30-python', None
def do_query_procedures(self):
return ['python-fu-palette-to-gradient',
'python-fu-palette-to-gradient-repeating']
def do_create_procedure(self, name):
procedure = Gimp.Procedure.new(self, name,
Gimp.PDBProcType.PLUGIN,
run, None)
if name == 'python-fu-palette-to-gradient':
procedure.set_menu_label(_("Palette to _Gradient"))
procedure.set_documentation(_("Create a gradient using colors from the palette"),
_("Create a new gradient using colors from the palette."),
"")
elif name == 'python-fu-palette-to-gradient-repeating':
procedure.set_menu_label(_("Palette to _Repeating Gradient"))
procedure.set_documentation(_("Create a repeating gradient using colors from the palette"),
_("Create a new repeating gradient using colors from the palette."),
"")
else:
procedure = None
if procedure is not None:
procedure.set_attribution("Carol Spears, reproduced from previous work by Adrian Likins and Jeff Trefftz",
"Carol Spears", "2006")
procedure.add_enum_argument ("run-mode", _("Run mode"),
_("The run mode"), Gimp.RunMode,
Gimp.RunMode.NONINTERACTIVE,
GObject.ParamFlags.READWRITE)
procedure.add_palette_argument ("palette", _("_Palette"),
_("Palette"), True,
None, True, # Default to context.
GObject.ParamFlags.READWRITE)
procedure.add_gradient_return_value ("new-gradient", _("The newly created gradient"),
_("The newly created gradient"),
GObject.ParamFlags.READWRITE)
procedure.add_menu_path ('<Palettes>/Palettes Menu')
return procedure
Gimp.main(PaletteToGradient.__gtype__, sys.argv)
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