From f806f8c526adfc23dafefd42ec7690cc99a8cd4e Mon Sep 17 00:00:00 2001
From: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
Date: Wed, 26 Jun 2019 15:56:41 +0200
Subject: [PATCH] add lv_draw_free_buf

---
 src/lv_core/lv_refr.c | 2 ++
 src/lv_draw/lv_draw.c | 9 +++++++++
 src/lv_draw/lv_draw.h | 2 ++
 3 files changed, 13 insertions(+)

diff --git a/src/lv_core/lv_refr.c b/src/lv_core/lv_refr.c
index 40ef7c2c1..7bdb3022b 100644
--- a/src/lv_core/lv_refr.c
+++ b/src/lv_core/lv_refr.c
@@ -217,6 +217,8 @@ void lv_disp_refr_task(lv_task_t * task)
         }
     }
 
+    lv_draw_free_buf();
+
     LV_LOG_TRACE("lv_refr_task: ready");
 }
 
diff --git a/src/lv_draw/lv_draw.c b/src/lv_draw/lv_draw.c
index 0f26b7d32..dd8e0ebc5 100644
--- a/src/lv_draw/lv_draw.c
+++ b/src/lv_draw/lv_draw.c
@@ -58,6 +58,15 @@ void * lv_draw_get_buf(uint32_t size)
     return draw_buf;
 }
 
+void lv_draw_free_buf(void)
+{
+    if(draw_buf) {
+        lv_mem_free(draw_buf);
+        draw_buf = NULL;
+        draw_buf_size = 0;
+    }
+}
+
 
 #if LV_ANTIALIAS
 
diff --git a/src/lv_draw/lv_draw.h b/src/lv_draw/lv_draw.h
index 442c4cc5f..0cec906e7 100644
--- a/src/lv_draw/lv_draw.h
+++ b/src/lv_draw/lv_draw.h
@@ -37,6 +37,8 @@ extern "C" {
 
 void * lv_draw_get_buf(uint32_t size);
 
+void lv_draw_free_buf(void);
+
 #if LV_ANTIALIAS
 
 /**