CI : Update to GafferHQ/dependencies 8.0.0a9

This contains fixes to handling of DWA compression in OpenEXRCore, as demonstrated in the new ImageReader unit tests.

.github/workflows/main/installDependencies.py

@@ -49,7 +49,7 @@
 
 # Determine default archive URL.
 
-defaultURL = "https://github.com/GafferHQ/dependencies/releases/download/8.0.0a8/gafferDependencies-8.0.0a8-{platform}{buildEnvironment}.{extension}"
+defaultURL = "https://github.com/GafferHQ/dependencies/releases/download/8.0.0a9/gafferDependencies-8.0.0a9-{platform}{buildEnvironment}.{extension}"
 
 # Parse command line arguments.
 

Changes.md

@@ -23,6 +23,9 @@ Fixes
   - Fixed error message to include filename [^1].
 - Expression : `setExpression()` now respects configs that provide backwards compatibility for old plug names.
 - Shuffle : Fixed default name for plugs constructed via the legacy `ChannelPlug( out, in )` constructor [^1].
+- ImageReader :
+  - Fixed loading of OpenEXR images with 32 bit float data and DWA compression [^1].
+  - Fixed loading of secondary layers in OpenEXR images with DWA compression [^1].
 
 API
 ---
@@ -36,6 +39,13 @@ Breaking Changes
 
 - StandardLightVisualiser : Added `attributeName` argument to `surfaceTexture()` virtual method.
 
+Build
+-----
+
+- OpenEXR : Applied patches from the following pull requests :
+  - https://github.com/AcademySoftwareFoundation/openexr/pull/1591
+  - https://github.com/AcademySoftwareFoundation/openexr/pull/1684
+
 [^1]: To be omitted from final release notes for 1.4.0.0.
 
 1.4.0.0b4 (relative to 1.4.0.0b3)

python/GafferImageTest/ImageReaderTest.py

@@ -959,5 +959,26 @@ def testSerialisation( self ) :
 		script2.execute( serialisation )
 		self.assertIsInstance( script2["reader"], GafferImage.ImageReader )
 
+	def testDWACompression( self ) :
+
+		reader = GafferImage.ImageReader()
+
+		stats = GafferImage.ImageStats()
+		stats["in"].setInput( reader["out"] )
+		stats["areaSource"].setValue( stats.AreaSource.DataWindow )
+
+		for file in [
+			"dwaHalfWithLayerPrefix.exr",
+			"dwaFloat.exr"
+		] :
+			with self.subTest( file = file ) :
+
+				reader["fileName"].setValue( self.imagesPath() / file )
+				stats["channels"].setValue( reader["out"].channelNames() )
+
+				for stat in ( "min", "max", "average" ) :
+					for c, expected in zip( stats[stat].getValue(), imath.Color4f( 0.3, 0.6, 0.9, 0 ) ) :
+						self.assertAlmostEqual( c, expected, delta = 0.0001 )
+
 if __name__ == "__main__":
 	unittest.main()