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import os
import unittest

import IECore

import Gaffer
import GafferImage
import GafferImageTest

class ObjectToImageTest( GafferImageTest.ImageTestCase ) :

	fileName = os.path.expandvars( "$GAFFER_ROOT/python/GafferImageTest/images/checker.exr" )
	negFileName = os.path.expandvars( "$GAFFER_ROOT/python/GafferImageTest/images/checkerWithNegativeDataWindow.200x150.exr" )

	def test( self ) :

		i = IECore.Reader.create( self.fileName ).read()

		n = GafferImage.ObjectToImage()
		n["object"].setValue( i )

		self.assertEqual( n["out"].image(), i )

	def testImageWithANegativeDataWindow( self ) :

		i = IECore.Reader.create( self.negFileName ).read()

		n = GafferImage.ObjectToImage()
		n["object"].setValue( i )

		self.assertEqual( n["out"].image(), i )

	def testHashVariesPerTileAndChannel( self ) :

		n = GafferImage.ObjectToImage()
		n["object"].setValue( IECore.Reader.create( self.fileName ).read() )

		self.assertNotEqual(
			n["out"].channelDataHash( "R", IECore.V2i( 0 ) ),
			n["out"].channelDataHash( "G", IECore.V2i( 0 ) )
		)

		self.assertNotEqual(
			n["out"].channelDataHash( "R", IECore.V2i( 0 ) ),
			n["out"].channelDataHash( "R", IECore.V2i( GafferImage.ImagePlug.tileSize() ) )
		)

if __name__ == "__main__":
	unittest.main()
