Add a README note about building with DQUIRC_MAX_REGIONS
Question about decoding large images has come up several times, let's document it better.
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@ -59,8 +59,12 @@ additional information on stdout.
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Installation
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------------
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To build the library and associated demos/tests, type `make`. Type
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`make install` to install the library, header file and camera demos.
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To build the library and associated demos/tests, type `make`. If you need to
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decode "large" image files build with `CFLAGS="-DQUIRC_MAX_REGIONS=65534" make`
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instead. Note that this will increase the memory usage, it is discouraged for
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low resource devices (i.e. embedded).
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Type `make install` to install the library, header file and camera demos.
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You can specify one or several of the following targets if you don't want, or
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are unable to build everything:
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