Implement 2D graphic API (#87)

* Implement 2D graphic library based on LittlevGL

* Add lvgl license file

samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.h

@@ -0,0 +1,71 @@
+/**
+ * @file XPT2046.h
+ *
+ */
+
+#ifndef XPT2046_H
+#define XPT2046_H
+
+#define USE_XPT2046 1
+#ifndef LV_CONF_INCLUDE_SIMPLE
+#define LV_CONF_INCLUDE_SIMPLE
+#endif
+
+#  define XPT2046_HOR_RES     320
+#  define XPT2046_VER_RES     240
+#  define XPT2046_X_MIN       200
+#  define XPT2046_Y_MIN       200
+#  define XPT2046_X_MAX       3800
+#  define XPT2046_Y_MAX       3800
+#  define XPT2046_AVG         4
+#  define XPT2046_INV         0
+
+#define CMD_X_READ  0b10010000
+#define CMD_Y_READ  0b11010000
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+//#include "lv_drv_conf.h"
+#else
+//#include "../../lv_drv_conf.h"
+#endif
+
+#if USE_XPT2046
+#include <autoconf.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "lv_hal/lv_hal_indev.h"
+#include "device.h"
+#include "gpio.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void xpt2046_init(void);
+bool xpt2046_read(lv_indev_data_t * data);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /* USE_XPT2046 */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* XPT2046_H */