Exclude some tests in Windows RDP session

It seems that RDP may change (limit?) color space (even configured
to use 32-bit colors), and then some tests start failing like this:

Test name: BackendTest::testDrawAlphaBitmapMirrored
equality assertion failed
- Expected: c[80000000]
- Actual  : c[84000000]

Debugging ImplDrawBitmap in vcl/win/gdi/gdiimpl.cxx, and adding a
call to GetPixel immediately after the call to StretchDIBits, shows
that the resulting color on the device is different from the color
in the bitmap data: e.g., for original color {128, 0, 0} the result
is {132, 0, 0}.

Calling GetColorAdjustment shows that there's no color adjustments
set for the device, so I can't detect or modify the behavior this
way. So just disable the tests for now when running in RDP sessions.

Change-Id: Ie89d07f18f53e56bed6f7fa58432b8575b4d9f12
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113388
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/unotest/bootstrapfixturebase.hxx b/include/unotest/bootstrapfixturebase.hxx
index 85f270b02c2c..ac0e1166f8a6 100644
--- a/include/unotest/bootstrapfixturebase.hxx
+++ b/include/unotest/bootstrapfixturebase.hxx
@@ -66,6 +66,7 @@ public:
   virtual void setUp() override;
   virtual void tearDown() override;
 
+  bool isWindowsRDP() const;
 };
 
 }