Disregard colorful areas, assumes that codes are printed black on white. This is an advanced configuration option, use with care.
An advanced option for disabling asynchronous reads from GPU when using 'webgl2'. Some older iOS versions have issues with WebGL2 asynchronous readbacks.
The locator implementation to use. This should normally not be changed, unless it is specifically required to target WebGL 1.
The region of interest in viewport coordinates.
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