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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