feat(draw): add vg-lite draw unit (#5010)

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>

src/draw/vg_lite/lv_draw_vg_lite_layer.c

@@ -0,0 +1,72 @@
+/**
+ * @file lv_draw_vg_lite_layer.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include "lv_draw_vg_lite.h"
+
+#if LV_USE_DRAW_VG_LITE
+
+#include "lv_vg_lite_utils.h"
+#include "lv_draw_vg_lite_type.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+void lv_draw_vg_lite_layer(lv_draw_unit_t * draw_unit, const lv_draw_image_dsc_t * draw_dsc,
+                           const lv_area_t * coords)
+{
+    lv_layer_t * layer = (lv_layer_t *)draw_dsc->src;
+
+    /*It can happen that nothing was draw on a layer and therefore its buffer is not allocated.
+     *In this case just return. */
+    if(layer->buf == NULL)
+        return;
+
+    lv_image_dsc_t img_dsc;
+    lv_memzero(&img_dsc, sizeof(lv_image_dsc_t));
+    img_dsc.header.w = lv_area_get_width(&layer->buf_area);
+    img_dsc.header.h = lv_area_get_height(&layer->buf_area);
+    img_dsc.header.cf = layer->color_format;
+    img_dsc.header.always_zero = 0;
+    img_dsc.data = layer->buf;
+
+    lv_draw_image_dsc_t new_draw_dsc = *draw_dsc;
+    new_draw_dsc.src = &img_dsc;
+
+    lv_draw_vg_lite_img(draw_unit, &new_draw_dsc, coords);
+    lv_cache_lock();
+    lv_cache_invalidate_by_src(&img_dsc, LV_CACHE_SRC_TYPE_POINTER);
+    lv_cache_unlock();
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+#endif /*LV_USE_DRAW_VG_LITE*/