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"""Various utilities relating to the OCIOCDLTransform node
"""
import nuke
import nukescripts
import PyOpenColorIO as OCIO
import xml.etree.ElementTree as ET
def _node_to_cdltransform(node):
"""From an OCIOCDLTransform node, returns a PyOpenColorIO
CDLTransform object, which could be used to write XML
"""
# Color_Knob.value returns single float if control is not
# expanded, so use value(index=...) to always get three values
slope = [node['slope'].value(x) for x in range(3)]
offset = [node['offset'].value(x) for x in range(3)]
power = [node['power'].value(x) for x in range(3)]
sat = node['saturation'].value()
cccid = node['cccid'].value()
cdl = OCIO.CDLTransform()
cdl.setSlope(slope)
cdl.setOffset(offset)
cdl.setPower(power)
cdl.setSat(sat)
cdl.setID(cccid)
return cdl
def _cdltransform_to_node(cdl, node):
"""From an XML string, populates the parameters on an
OCIOCDLTransform node
"""
# Treat "node" as a dictionary of knobs, as the "node" argument could be
# a the return value of PythonPanel.knob(), as in SelectCCCIDPanel
node['slope'].setValue(cdl.getSlope())
node['offset'].setValue(cdl.getOffset())
node['power'].setValue(cdl.getPower())
node['saturation'].setValue(cdl.getSat())
node['cccid'].setValue(cdl.getID())
def _xml_to_cdltransforms(xml):
"""Given some XML as a string, returns a list of CDLTransform
objects for each ColorCorrection (returns a one-item list for a
.cc file)
"""
tree = ET.fromstring(xml)
# Strip away xmlns
for elem in tree.getiterator():
if elem.tag.startswith("{"):
elem.tag = elem.tag.partition("}")[2]
filetype = tree.tag
if filetype == "ColorCorrection":
ccxml = ET.tostring(tree)
cdl = OCIO.CDLTransform()
cdl.setXML(ccxml)
return [cdl]
elif filetype == "ColorCorrectionCollection":
allcdl = []
for cc in tree.getchildren():
if cc.tag != "ColorCorrection": continue
ccxml = ET.tostring(cc)
cdl = OCIO.CDLTransform()
cdl.setXML(ccxml)
allcdl.append(cdl)
return allcdl
else:
raise RuntimeError(
"The supplied file did not have the correct root element, expected"
" 'ColorCorrection' or 'ColorCorrectionCollection', got %r" % (filetype))
def _cdltransforms_to_xml(allcc):
"""Given a list of CDLTransform objects, returns an XML string
"""
root = ET.Element("ColorCorrectionCollection")
root.attrib['xmlns'] = 'urn:ASC:CDL:v1.2'
for cc in allcc:
cur = ET.fromstring(cc.getXML())
# Strip away xmlns
for elem in cur.getiterator():
if elem.tag.startswith("{"):
elem.tag = elem.tag.partition("}")[2]
root.append(cur)
return ET.tostring(root)
class SelectCCCIDPanel(nukescripts.PythonPanel):
"""Allows the user to select from a list of CDLTransform
objects
"""
def __init__(self, allcdl):
super(SelectCCCIDPanel, self).__init__()
self.available = {}
for cur in allcdl:
self.available[cur.getID()] = cur
self.addKnob(nuke.Enumeration_Knob("cccid", "cccid", self.available.keys()))
self.addKnob(nuke.Text_Knob("divider"))
self.addKnob(nuke.Color_Knob("slope"))
self.addKnob(nuke.Color_Knob("offset"))
self.addKnob(nuke.Color_Knob("power"))
self.addKnob(nuke.Double_Knob("saturation"))
def selected(self):
return self.available[self.knobs()['cccid'].value()]
def knobChanged(self, knob):
"""When the user selects a cccid, a grade-preview knobs are set.
This method is triggered when any knob is changed, which has the
useful side-effect of preventing changing the preview values, while
keeping them selectable for copy-and-paste.
"""
_cdltransform_to_node(self.selected(), self.knobs())
def export_as_cc(node = None, filename = None):
"""Export a OCIOCDLTransform node as a ColorCorrection XML file
(.cc)
If node is None, "nuke.thisNode()" will be used. If filename is
not specified, the user will be prompted.
"""
if node is None:
node = nuke.thisNode()
cdl = _node_to_cdltransform(node)
if filename is None:
ccfilename = nuke.getFilename("Color Correction filename", pattern = "*.cc")
if ccfilename is None:
# User clicked cancel
return
xml = cdl.getXML()
print "Writing to %s - contents:\n%s" % (ccfilename, xml)
open(ccfilename, "w").write(xml)
def import_cc_from_xml(node = None, filename = None):
"""Import a ColorCorrection XML (.cc) into a OCIOCDLTransform node.
If node is None, "nuke.thisNode()" will be used. If filename is
not specified, the user will be prompted.
"""
if node is None:
node = nuke.thisNode()
if filename is None:
ccfilename = nuke.getFilename("Color Correction filename", pattern = "*.cc *.ccc")
if ccfilename is None:
# User clicked cancel
return
xml = open(ccfilename).read()
allcc = _xml_to_cdltransforms(xml)
if len(allcc) == 1:
_cdltransform_to_node(allcc[0], node)
elif len(allcc) > 1:
do_selectcccid = nuke.ask(
"Selected a ColorCorrectionCollection, do you wish to select a ColorCorrection from this file?")
if do_selectcccid:
sel = SelectCCCIDPanel(allcc)
okayed = sel.showModalDialog()
if okayed:
cc = sel.selected()
_cdltransform_to_node(cc, node)
else:
return
else:
nuke.message("The supplied file (%r) contained no ColorCorrection's" % ccfilename)
return
def export_multiple_to_ccc(filename = None):
"""Exported all selected OCIOCDLTransform nodes to a
ColorCorrectionCollection XML file (.ccc)
"""
if filename is None:
filename = nuke.getFilename("Color Correction XML file", pattern = "*.cc *.ccc")
if filename is None:
# User clicked cancel
return
allcc = []
for node in nuke.selectedNodes("OCIOCDLTransform"):
allcc.append(_node_to_cdltransform(node))
xml = _cdltransforms_to_xml(allcc)
print "Writing %r, contents:\n%s" % (filename, xml)
open(filename, "w").write(xml)
def import_multiple_from_ccc(filename = None):
"""Import a ColorCorrectionCollection file (.ccc) into multiple
OCIOCDLTransform nodes. Also creates a single node for a .cc file
"""
if filename is None:
filename = nuke.getFilename("Color Correction XML file", pattern = "*.cc *.ccc")
if filename is None:
# User clicked cancel
return
xml = open(filename).read()
allcc = _xml_to_cdltransforms(xml)
def _make_node(cdl):
newnode = nuke.nodes.OCIOCDLTransform(inputs = nuke.selectedNodes()[:1])
_cdltransform_to_node(cdl, newnode)
newnode['label'].setValue("id: [value cccid]")
if len(allcc) > 0:
for cc in allcc:
_make_node(cc)
else:
nuke.message("The supplied file (%r) contained no ColorCorrection's" % filename)
def select_cccid_for_filetransform(node = None, fileknob = 'file', cccidknob = 'cccid'):
"""Select cccid button for the OCIOFileTransform node, also used
in OCIOCDLTransform. Presents user with list of cccid's within the
specified .ccc file, and sets the cccid knob to the selected ID.
"""
if node is None:
node = nuke.thisNode()
filename = node[fileknob].value()
try:
xml = open(filename).read()
except IOError, e:
nuke.message("Error opening src file: %s" % e)
raise
allcc = _xml_to_cdltransforms(xml)
if len(allcc) == 0:
nuke.message("The file (%r) contains no ColorCorrection's")
return
sel = SelectCCCIDPanel(allcc)
okayed = sel.showModalDialog()
if okayed:
node[cccidknob].setValue(sel.selected().getID())
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