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Kenneth Moreland authored
Previously, the `TransferFunction` worklet required you to call `PrepareForExecution` on the `ColorTable` and give that to the constructor. Bad things can happen if the `ColorTable` used in the constructor does not match the device the worklet actually gets invoked on. Change this to make the `ColorTable` a worklet argument of type `ExecObj`. The dispatcher will automatically call `ColorTable::PrepareForInput` and guarantee that the devices match.
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