GetDIBits(): Handle Bitfields properly

[Michael Kaufmann]

Changelog:

GetDIBits():
   - Don't set the bitfields if biBitCount == 0 (this was a memory 
corruption bug)
   - Support the BI_BITFIELDS compression mode by setting bitfield masks 
that use the same bits as the BI_RGB compression mode (Windows does this 
too on my system)
   - Check the input values in the BITMAPINFO structure (width, height, 
and planes must be valid if biBitCount != 0)
   - Add a new test.
---
  dlls/gdi32/dib.c          |   72 ++++++++++++++++++++++++++++++++---------
  dlls/gdi32/tests/bitmap.c |   80 
+++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 136 insertions(+), 16 deletions(-)
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