[Mono-bugs] [Bug 80323][Nor] New - Incorrect ColorMatrix alpha processing

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Wed Dec 20 05:13:19 EST 2006

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Changed by josecoig at cae.net.


--- shadow/80323	2006-12-20 05:13:19.000000000 -0500
+++ shadow/80323.tmp.31778	2006-12-20 05:13:19.000000000 -0500
@@ -0,0 +1,49 @@
+Bug#: 80323
+Product: Mono: Runtime
+Version: 1.2
+OS: other
+OS Details: SUSE 10.1
+Status: NEW   
+Priority: Normal
+Component: misc
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: josecoig at cae.net               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+Summary: Incorrect ColorMatrix alpha processing
+Description of Problem:
+When using ColorMatrix effects on bitmap displaying, the returned picture 
+doesn't show the expected results.
+The attached test case shows two examples: 
+   1) a blue color is drawn over the same blue background, applying an 
+alpha effect using a ColorMatrix.
+   2) a semi-transparent red circle is rendered before, and after 
+applying an alpha effect using a ColorMatrix.
+Steps to reproduce the problem:
+1. Run the attached executable
+Actual Results:
+   The first example shows different shades of blue depending on the 
+value of the alpha effect being used
+   The second example shows the first circle correctly, but the second 
+one is invisible.
+Expected Results:
+   The first example should always show the same blue, no matter the 
+level of alpha being used, as the background color is exactly the same as 
+the foreground one.
+   The second example should show the second circle, and it should look 
+fainter than the first one.
+How often does this happen? 
+   Always
+Additional Information:

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