From a5479bf5026913806b6efc6db6b716bc5bba7793 Mon Sep 17 00:00:00 2001
From: Nano <nanoapezlk@gmail.com>
Date: Wed, 10 May 2023 19:46:35 +0800
Subject: [PATCH 1/2] fix(wechat_code): Modify `isnan` for compatibility with
 -ffast_math

fix #3150
---
 modules/wechat_qrcode/src/zxing/zxing.hpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/modules/wechat_qrcode/src/zxing/zxing.hpp b/modules/wechat_qrcode/src/zxing/zxing.hpp
index 76efae22c87..1cfb8f0e3a1 100644
--- a/modules/wechat_qrcode/src/zxing/zxing.hpp
+++ b/modules/wechat_qrcode/src/zxing/zxing.hpp
@@ -54,8 +54,14 @@ typedef unsigned char boolean;
 #include <cmath>
 
 namespace zxing {
-inline bool isnan(float v) { return std::isnan(v); }
-inline bool isnan(double v) { return std::isnan(v); }
+inline bool isnan(float v) { 
+    union { float v; uint32_t x; } u = { v };
+    return (u.x & 0x7fffffffu) > 0x7f800000u;
+}
+inline bool isnan(double v) { 
+    union { double v; uint64_t x; } u = { v };
+    return (u.x & ~0x8000000000000000uLL) > 0x7ff0000000000000uLL;
+}
 inline float nan() { return std::numeric_limits<float>::quiet_NaN(); }
 }  // namespace zxing
 

From c10eb882a05a96936add671823f7c5b786330138 Mon Sep 17 00:00:00 2001
From: Alexander Smorkalov <alexander.smorkalov@xperience.ai>
Date: Tue, 27 Jun 2023 21:48:41 +0300
Subject: [PATCH 2/2] Use OpenCV cvInf/cvNan

---
 modules/wechat_qrcode/src/zxing/zxing.hpp | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/modules/wechat_qrcode/src/zxing/zxing.hpp b/modules/wechat_qrcode/src/zxing/zxing.hpp
index 1cfb8f0e3a1..d735c830f2f 100644
--- a/modules/wechat_qrcode/src/zxing/zxing.hpp
+++ b/modules/wechat_qrcode/src/zxing/zxing.hpp
@@ -11,6 +11,7 @@
 #ifndef __ZXING_ZXING_HPP__
 #define __ZXING_ZXING_HPP__
 
+#include "opencv2/core/fast_math.hpp"
 
 #define COUNTER_TYPE short
 
@@ -54,14 +55,8 @@ typedef unsigned char boolean;
 #include <cmath>
 
 namespace zxing {
-inline bool isnan(float v) { 
-    union { float v; uint32_t x; } u = { v };
-    return (u.x & 0x7fffffffu) > 0x7f800000u;
-}
-inline bool isnan(double v) { 
-    union { double v; uint64_t x; } u = { v };
-    return (u.x & ~0x8000000000000000uLL) > 0x7ff0000000000000uLL;
-}
+inline bool isnan(float v) { return (bool)cvIsNaN(v); }
+inline bool isnan(double v) { return (bool)cvIsNaN(v); }
 inline float nan() { return std::numeric_limits<float>::quiet_NaN(); }
 }  // namespace zxing