broken backwards compatibility

[Cyrille Berger Skott]

On Thursday 28 April 2011, Boudewijn Rempt wrote:
> I tried loading the Wasted Mutants showcase file in Krita today and
> discovered that it doesn't look like the original version on krita.org
> anymore... Maybe that's because the background gradient layer was
> disabled, but I fear we have a regression here. Animtim, can you check?
It is probably related to this unit test failure:
http://my.cdash.org/testDetails.php?test=5883333&build=182488

Since the file use the "screen" Composite op which now return totally different 
values:
FAIL!  : TestKoCompositeOps::testCompositeScreen() Compared values are not the 
same
   Actual (p16f1.red): 15014
   Expected ((quint16)18840): 18840
   Loc: 
[/home/cyrille/src/calligra/libs/pigment/tests/TestKoCompositeOps.cpp(1072)]


And if you click on the "Alpha channel" icon for layer "21" then the file is 
fixed.

My opinion is that the default value for "Alpha channel" should be inversed. 
Especially since it would give the same behaviour as in other applications.

-- 
Cyrille Berger Skott