From 492a474f5f0b8caafeb1a8859fd52d3d5497e8f5 Mon Sep 17 00:00:00 2001
From: Benign X <1341398182@qq.com>
Date: Thu, 14 Dec 2023 21:22:54 +0800
Subject: [PATCH] feat(lv_math): add lv_rand_set_seed api (#5013)

---
 src/lv_init.c      | 2 +-
 src/misc/lv_math.c | 5 +++++
 src/misc/lv_math.h | 6 ++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/lv_init.c b/src/lv_init.c
index 3affdff0d..9ec104c17 100644
--- a/src/lv_init.c
+++ b/src/lv_init.c
@@ -87,7 +87,7 @@ static inline void lv_global_init(lv_global_t * global)
     global->style_last_custom_prop_id = (uint32_t)_LV_STYLE_LAST_BUILT_IN_PROP;
     global->area_trans_cache.angle_prev = INT32_MIN;
     global->event_last_register_id = _LV_EVENT_LAST;
-    global->math_rand_seed = 0x1234ABCD;
+    lv_rand_set_seed(0x1234ABCD);
 
 #if defined(LV_DRAW_SW_SHADOW_CACHE_SIZE) && LV_DRAW_SW_SHADOW_CACHE_SIZE > 0
     global->sw_shadow_cache.cache_size = -1;
diff --git a/src/misc/lv_math.c b/src/misc/lv_math.c
index c3ead50c9..11f3f50ad 100644
--- a/src/misc/lv_math.c
+++ b/src/misc/lv_math.c
@@ -333,6 +333,11 @@ int32_t lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32
     return ((x - min_in) * delta_out) / delta_in + min_out;
 }
 
+void lv_rand_set_seed(uint32_t seed)
+{
+    rand_seed = seed;
+}
+
 uint32_t lv_rand(uint32_t min, uint32_t max)
 {
     /*Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs"*/
diff --git a/src/misc/lv_math.h b/src/misc/lv_math.h
index af2036e86..9d889d655 100644
--- a/src/misc/lv_math.h
+++ b/src/misc/lv_math.h
@@ -125,6 +125,12 @@ int64_t lv_pow(int64_t base, int8_t exp);
  */
 int32_t lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32_t max_out);
 
+/**
+ * Set the seed of the pseudo random number generator
+ * @param seed a number to initialize the random generator
+ */
+void lv_rand_set_seed(uint32_t seed);
+
 /**
  * Get a pseudo random number in the given range
  * @param min   the minimum value