From 95347b768b17ffc5d6b0f1aac648ad84421656ad Mon Sep 17 00:00:00 2001
From: SmartAnda <908656706@qq.com>
Date: Wed, 28 Jul 2021 14:58:25 +0800
Subject: [PATCH] fix circle drawing algorithms (#2413)

---
 src/draw/lv_draw_mask.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/draw/lv_draw_mask.c b/src/draw/lv_draw_mask.c
index 69fccc78a..d35c4720c 100644
--- a/src/draw/lv_draw_mask.c
+++ b/src/draw/lv_draw_mask.c
@@ -1291,20 +1291,20 @@ static void circ_calc_aa4(_lv_draw_mask_radius_circle_dsc_t * c, lv_coord_t radi
     int32_t mid = radius * 723;
     int32_t mid_int = mid >> 10;
     if(cir_x[cir_size-1] != mid_int || cir_y[cir_size-1] != mid_int) {
-        tmp = mid - (mid_int << 10);
-        if(tmp <= 512) {
-            tmp = tmp * tmp * 2;
-            tmp = tmp >> (10 + 6);
+        int32_t tmp_val = mid - (mid_int << 10);
+        if(tmp_val <= 512) {
+            tmp_val = tmp_val * tmp_val * 2;
+            tmp_val = tmp_val >> (10 + 6);
         } else {
-            tmp = 1024 - tmp;
-            tmp = (int32_t)tmp * tmp * 2;
-            tmp = (int32_t)tmp >> (10 + 6);
-            tmp = 15 - tmp;
+            tmp_val = 1024 - tmp_val;
+            tmp_val = tmp_val * tmp_val * 2;
+            tmp_val = tmp_val >> (10 + 6);
+            tmp_val = 15 - tmp_val;
         }
 
         cir_x[cir_size] = mid_int;
         cir_y[cir_size] = mid_int;
-        c->cir_opa[cir_size] = tmp;
+        c->cir_opa[cir_size] = tmp_val;
         c->cir_opa[cir_size] *= 16;
         cir_size++;
     }