fixed AlgorithmInfo::read for read only parameters (thanks to Vadim)

modules/core/include/opencv2/core/core.hpp

@@ -4312,10 +4312,10 @@ public:
 class CV_EXPORTS AlgorithmInfo
 {
 public:
+    friend class Algorithm;
     AlgorithmInfo(const string& name, Algorithm::Constructor create);
     ~AlgorithmInfo();
     void get(const Algorithm* algo, const char* name, int argType, void* value) const;
-    void set(Algorithm* algo, const char* name, int argType, const void* value) const;
     void addParam_(Algorithm& algo, const char* name, int argType,
                    void* value, bool readOnly, 
                    Algorithm::Getter getter, Algorithm::Setter setter,
@@ -4365,6 +4365,8 @@ public:
                   const string& help=string());
 protected:
     AlgorithmInfoData* data;
+    void set(Algorithm* algo, const char* name, int argType,
+              const void* value, bool force=false) const;
 };
 
 

modules/core/src/algorithm.cpp

@@ -296,9 +296,9 @@ AlgorithmInfo::~AlgorithmInfo()
     
 void AlgorithmInfo::write(const Algorithm* algo, FileStorage& fs) const
 {
-    size_t i = 0, n = data->params.vec.size();
+    size_t i = 0, nparams = data->params.vec.size();
     cv::write(fs, "name", algo->name());
-    for( i = 0; i < n; i++ )
+    for( i = 0; i < nparams; i++ )
     {
         const Param& p = data->params.vec[i].second;
         const string& pname = data->params.vec[i].first;
@@ -327,9 +327,10 @@ void AlgorithmInfo::write(const Algorithm* algo, FileStorage& fs) const
 
 void AlgorithmInfo::read(Algorithm* algo, const FileNode& fn) const
 {
-    size_t i = 0, n = data->params.vec.size();
+    size_t i = 0, nparams = data->params.vec.size();
+    AlgorithmInfo* info = algo->info();
     
-    for( i = 0; i < n; i++ )
+    for( i = 0; i < nparams; i++ )
     {
         const Param& p = data->params.vec[i].second;
         const string& pname = data->params.vec[i].first;
@@ -337,31 +338,43 @@ void AlgorithmInfo::read(Algorithm* algo, const FileNode& fn) const
         if( n.empty() )
             continue;
         if( p.type == Param::INT )
-            algo->set(pname, (int)n);
+        {
+            int val = (int)n;
+            info->set(algo, pname.c_str(), p.type, &val, true);
+        }
         else if( p.type == Param::BOOLEAN )
-            algo->set(pname, (int)n != 0);
+        {
+            bool val = (int)n != 0;
+            info->set(algo, pname.c_str(), p.type, &val, true);
+        }
         else if( p.type == Param::REAL )
-            algo->set(pname, (double)n);
+        {
+            double val = (double)n;
+            info->set(algo, pname.c_str(), p.type, &val, true);
+        }
         else if( p.type == Param::STRING )
-            algo->set(pname, (string)n);
+        {
+            string val = (string)n;
+            info->set(algo, pname.c_str(), p.type, &val, true);
+        }
         else if( p.type == Param::MAT )
         {
             Mat m;
             cv::read(n, m);
-            algo->set(pname, m);
+            info->set(algo, pname.c_str(), p.type, &m, true);
         }
         else if( p.type == Param::MAT_VECTOR )
         {
             vector<Mat> mv;
             cv::read(n, mv);
-            algo->set(pname, mv);
+            info->set(algo, pname.c_str(), p.type, &mv, true);
         }
         else if( p.type == Param::ALGORITHM )
         {
             Ptr<Algorithm> nestedAlgo = Algorithm::_create((string)n["name"]);
             CV_Assert( !nestedAlgo.empty() );
             nestedAlgo->read(n);
-            algo->set(pname, nestedAlgo);
+            info->set(algo, pname.c_str(), p.type, &nestedAlgo, true);
         }
         else
             CV_Error( CV_StsUnsupportedFormat, "unknown/unsupported parameter type");
@@ -392,14 +405,14 @@ union GetSetParam
     void (Algorithm::*set_algo)(const Ptr<Algorithm>&);
 };
 
-void AlgorithmInfo::set(Algorithm* algo, const char* name, int argType, const void* value) const
+void AlgorithmInfo::set(Algorithm* algo, const char* name, int argType, const void* value, bool force) const
 {
     const Param* p = findstr(data->params, name);
 
     if( !p )
         CV_Error_( CV_StsBadArg, ("No parameter '%s' is found", name ? name : "<NULL>") );
 
-    if( p->readonly )
+    if( !force && p->readonly )
         CV_Error_( CV_StsError, ("Parameter '%s' is readonly", name));
 
     GetSetParam f;