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Increase maximum FFT resolution#176

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Commits on Sep 20, 2020

• split waterfall over multiple canvas elements to increase maximum fft resolution

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  0987a67

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• measure waterfall min/max in two passes, to prevent stack overflow on high fft sizes.

  jwt27

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  9e70473

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Commits on Sep 29, 2020

• clamp waterfall canvas width to 100% for fft_size < canvas_max_width

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  cebe7c7

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