start a brand new line drawing algorithm

lv_draw/lv_draw.h

@@ -128,6 +128,9 @@ void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
 void lv_draw_line(const lv_point_t * p1, const lv_point_t * p2, const lv_area_t * mask_p,
                   const lv_style_t * style_p);
 
+#if LV_ANTIALIAS != 0
+lv_opa_t antialias_get_opa(lv_coord_t seg, lv_coord_t px_id, lv_opa_t line_opa);
+#endif
 
 /**********************
  *  GLOBAL VARIABLES

lv_draw/lv_draw_line.h

+/**
+ * @file lv_draw_line.h
+ *
+ */
+
+#ifndef LV_DRAW_LINE_H
+#define LV_DRAW_LINE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DRAW_LINE_H*/