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/* pixels are scaled up by this factor */
#define QRCODE_SCALE 2
/* this is the maximum scale factor */
#define QRCODE_MAX_SCALE 8
/* width of the border
* this is defined to at least 4, but works well with less */
# define QRCODE_BORDER 1
/* this is the maximum border width */
# define QRCODE_MAX_BORDER 8
/* error correction level used for QR code
* possible values: QR_ECLEVEL_L (lowest, about 7% error can be corrected)
* QR_ECLEVEL_M (about 15%)
* QR_ECLEVEL_Q (about 25%)
* QR_ECLEVEL_H (highest, about 30%)
* image size raises with higher levels */
#define QRCODE_LEVEL QR_ECLEVEL_L
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