QR Code (gfx_qrcode)
====================

Types
-----

gfx_qrcode_ecc_t
~~~~~~~~~~~~~~~~

.. code-block:: c

   typedef enum {
       GFX_QRCODE_ECC_LOW = 0,      /**< The QR Code can tolerate about 7% erroneous codewords */
       GFX_QRCODE_ECC_MEDIUM,       /**< The QR Code can tolerate about 15% erroneous codewords */
       GFX_QRCODE_ECC_QUARTILE,     /**< The QR Code can tolerate about 25% erroneous codewords */
       GFX_QRCODE_ECC_HIGH          /**< The QR Code can tolerate about 30% erroneous codewords */
   } gfx_qrcode_ecc_t;

Functions
---------

gfx_qrcode_create()
~~~~~~~~~~~~~~~~~~~

.. code-block:: c

   gfx_obj_t * gfx_qrcode_create(gfx_disp_t *disp);

gfx_qrcode_set_data()
~~~~~~~~~~~~~~~~~~~~~

Set the data/text for a QR Code object

.. code-block:: c

   esp_err_t gfx_qrcode_set_data(gfx_obj_t *obj, const char *data);

**Parameters:**

* ``obj`` - Pointer to the QR Code object
* ``data`` - Pointer to the null-terminated string to encode

**Returns:**

* ESP_OK on success, error code otherwise

**Note:**

The length is automatically calculated using strlen()

gfx_qrcode_set_size()
~~~~~~~~~~~~~~~~~~~~~

Set the size for a QR Code object

.. code-block:: c

   esp_err_t gfx_qrcode_set_size(gfx_obj_t *obj, uint16_t size);

**Parameters:**

* ``obj`` - Pointer to the QR Code object
* ``size`` - Size in pixels (both width and height)

**Returns:**

* ESP_OK on success, error code otherwise

gfx_qrcode_set_ecc()
~~~~~~~~~~~~~~~~~~~~

Set the error correction level for a QR Code object

.. code-block:: c

   esp_err_t gfx_qrcode_set_ecc(gfx_obj_t *obj, gfx_qrcode_ecc_t ecc);

**Parameters:**

* ``obj`` - Pointer to the QR Code object
* ``ecc`` - Error correction level

**Returns:**

* ESP_OK on success, error code otherwise

gfx_qrcode_set_color()
~~~~~~~~~~~~~~~~~~~~~~

Set the foreground color for a QR Code object

.. code-block:: c

   esp_err_t gfx_qrcode_set_color(gfx_obj_t *obj, gfx_color_t color);

**Parameters:**

* ``obj`` - Pointer to the QR Code object
* ``color`` - Foreground color (QR modules color)

**Returns:**

* ESP_OK on success, error code otherwise

gfx_qrcode_set_bg_color()
~~~~~~~~~~~~~~~~~~~~~~~~~

Set the background color for a QR Code object

.. code-block:: c

   esp_err_t gfx_qrcode_set_bg_color(gfx_obj_t *obj, gfx_color_t bg_color);

**Parameters:**

* ``obj`` - Pointer to the QR Code object
* ``bg_color`` - Background color

**Returns:**

* ESP_OK on success, error code otherwise