From f4ffba10706fc63688ca131316f30545142df5b4 Mon Sep 17 00:00:00 2001
From: Michael Troger <github@troger.app>
Date: Thu, 29 Feb 2024 18:47:07 +0100
Subject: [PATCH] Increase CMAKE version and create constant for thickness

---
 app/src/main/cpp/CMakeLists.txt    |  9 +++++----
 app/src/main/cpp/native_opencv.cpp | 13 +++++++------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt
index 4e88a8a..4e607af 100644
--- a/app/src/main/cpp/CMakeLists.txt
+++ b/app/src/main/cpp/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.1)
+cmake_minimum_required(VERSION 3.22.1)
 
 # register the project for the C++ language
 project(app CXX)
@@ -12,11 +12,12 @@ add_library(
         SHARED
         native_opencv.cpp
 )
+
 # compile with c++20
-set_target_properties(
+target_compile_features(
         app
-        PROPERTIES
-        CXX_STANDARD 20
+        PUBLIC
+        cxx_std_20
 )
 
 # link the required libs together
diff --git a/app/src/main/cpp/native_opencv.cpp b/app/src/main/cpp/native_opencv.cpp
index 89be046..aed3247 100644
--- a/app/src/main/cpp/native_opencv.cpp
+++ b/app/src/main/cpp/native_opencv.cpp
@@ -15,9 +15,10 @@ using namespace cv;
 #define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
 #define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
 
-Mat* mCanny = NULL;
-
 const Scalar RGBA_DRAWING_COLOR = Scalar(0, 255, 0, 255);
+const int LINE_THICKNESS = 4;
+
+Mat* mCanny = NULL;
 
 Ptr<ORB> fd_de;
 BFMatcher dm(NORM_HAMMING);
@@ -119,22 +120,22 @@ extern "C" {
                               scene_corners[0],
                               scene_corners[1],
                               RGBA_DRAWING_COLOR,
-                              4 );
+                              LINE_THICKNESS);
                         line( rgbaImg,
                               scene_corners[1],
                               scene_corners[2],
                               RGBA_DRAWING_COLOR,
-                              4 );
+                              LINE_THICKNESS);
                         line( rgbaImg,
                               scene_corners[2],
                               scene_corners[3],
                               RGBA_DRAWING_COLOR,
-                              4 );
+                              LINE_THICKNESS);
                         line( rgbaImg,
                               scene_corners[3],
                               scene_corners[0],
                               RGBA_DRAWING_COLOR,
-                              4 );
+                              LINE_THICKNESS);
                     }
 
                     catch (Exception e) {