Decode overlapping rectangles in order
diff --git a/common/rfb/Decoder.h b/common/rfb/Decoder.h
index 95c1466..f631a55 100644
--- a/common/rfb/Decoder.h
+++ b/common/rfb/Decoder.h
@@ -53,6 +53,13 @@
// A lock will be held whilst these are called so it is safe to
// read and update internal state as necessary.
+ // getAffectedRegion() returns the parts of the frame buffer will
+ // be either read from or written do when decoding this rect. The
+ // default implementation simply returns the given rectangle.
+ virtual void getAffectedRegion(const Rect& rect, const void* buffer,
+ size_t buflen, const ConnParams& cp,
+ Region* region);
+
// decodeRect() decodes the given rectangle with data from the
// given buffer, onto the ModifiablePixelBuffer. The PixelFormat of
// the PixelBuffer might not match the ConnParams and it is up to