/* 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
/* note that changing the level at runtime requies
 * a numeric value from 0 to 3 */

/* if you really, really, really want to save some bytes...
 * it is possible to disable text information in PNG file, just uncomment
 * below to undefine PNG_TEXT_SUPPORTED */
/* #undef PNG_TEXT_SUPPORTED */