[Bug 37431] New: Incorrect handling of SetBkMode(dc, TRANSPARENT) with hatch brush

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=37431

            Bug ID: 37431
           Summary: Incorrect handling of SetBkMode(dc, TRANSPARENT) with
                    hatch brush
           Product: Wine
           Version: 1.6.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
          Assignee: wine-bugs at winehq.org
          Reporter: matteo at mitalia.net
      Distribution: ---

Created attachment 49789
  --> https://bugs.winehq.org/attachment.cgi?id=49789
Sample program

On some kind of DCs (tested: memory DCs, DC provided by BeginPaint) a hatch
brush (created by CreateHatchBrush) performs fills incorrectly when setting the
background mode of the DC to TRANSPARENT. The pixels that should be transparent
are black instead (see attachments for example); ExtTextOut in the same
conditions instead performs correctly.

Interestingly, the behavior seems to be correct when painting over the screen
DC (obtained via GetDC(NULL)). The attached sample program (also at
https://bitbucket.org/mitalia/hatchbrushbug/src/hatchbrushbug.cpp) demonstrates
the problem.

My tests were performed with the wine 1.6.2 packages shipped with KUbuntu 14.04
x86-64; the problem is present also compiling a winelib executable with
wineg++. Native works fine.

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