<p>
  <img class="alignnone size-full" src="images/bltrop.png" alt="" width="640" height="480" />
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<p>
  This test draws a background consisting of gradients, and then draws three objects using three different common Win32 raster operations, specifically SRCCOPY, DSTINVERT, and PATCOPY. The SRCCOPY should be a color palette, the DSTINVERT should invert the background, and the PATCOPY should show a pattern revealed under the object (the object moves, the pattern doesn’t).
</p>