Just to add that you could also be having some electrical issues if you get flickering - I think there's a note on the WS2811 page about using a pullup resistor and putting SPI into Open Drain mode? It might be needed if you're running the panel off a separate 5v supply.
... finally I don't know if Glediator handles the zig-zag pattern of the LEDs? It could be a pain to try and re-order them quickly. About the only thing I can think is to use Graphics with drawImage of the image data you received.
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