FillPolygon to view which is child of BBitmap corruption

[smallstepforman]

I have 2 code paths to draw a BPolygon. The first one draws directly from BView::Draw() (via FillPolygon) and works fine . If I add the same BView to a BBitmap, then there is occassional corruption when drawing the BPolygon. See screenshots. The grey polygon is done directly via BView::Draw::FillPolygon. The coloured polygon is drawn when added to bitmap (it creates a mask used for compositing). Saving the BBitmap data also shows the corruption so it's not the compositing code path.

[smallstepforman]

BBitmap::View::FillPolygon

[smallstepforman]

BView::FillPolygon

[smallstepforman]

The dark patch behind 6 is created when drawing via BBitmap::View::FillPolygon. It shouldn't be there (as evidenced when drawing directly to BView (grey screenshot)

[jackburton]

I see the black triangle in both screenshots, actually

[pulkomandy]

It would be a lot easier to investigate if you would share a piece of code reproducing this.

[smallstepforman]

Great, another Heisen bug. I've created a test program, and the test program works fine. However, when I combine it with the OpenGL masking code path, it exhibits the problem on some scenarios. Well, considering that the test program always works, I'm sure the issue is somewhere at my end, the Haiku API works as advertised, so it's safe to close this issue. If I discover more information, I'll create a new ticket.