Merge pull request #25075 from mshabunin:cleanup-imgproc-1

C-API cleanup: apps, imgproc_c and some constants #25075

Merge with https://github.com/opencv/opencv_contrib/pull/3642

* Removed obsolete apps - traincascade and createsamples (please use older OpenCV versions if you need them). These apps relied heavily on C-API
* removed all mentions of imgproc C-API headers (imgproc_c.h, types_c.h) - they were empty, included core C-API headers
* replaced usage of several C constants with C++ ones (error codes, norm modes, RNG modes, PCA modes, ...) - most part of this PR (split into two parts - all modules and calib+3d - for easier backporting)
* removed imgproc C-API headers (as separate commit, so that other changes could be backported to 4.x)

Most of these changes can be backported to 4.x.

modules/ts/include/opencv2/ts/ocl_test.hpp

@@ -48,7 +48,6 @@
 #include "opencv2/videoio.hpp"
 #include "opencv2/highgui.hpp"
 #include "opencv2/imgproc.hpp"
-#include "opencv2/imgproc/types_c.h"
 #include "opencv2/core/ocl.hpp"
 
 namespace cvtest {

modules/ts/src/ts.cpp

@@ -643,7 +643,7 @@ void TS::update_context( BaseTest* test, int test_case_idx, bool update_ts_conte
     current_test_info.test = test;
     current_test_info.test_case_idx = test_case_idx;
     current_test_info.code = 0;
-    cvSetErrStatus( CV_StsOk );
+    cvSetErrStatus( cv::Error::StsOk );
 }
 
 

modules/ts/src/ts_func.cpp

@@ -1,7 +1,6 @@
 #include "precomp.hpp"
 #include <float.h>
 #include <limits.h>
-#include "opencv2/imgproc/types_c.h"
 
 using namespace cv;
 
@@ -407,7 +406,7 @@ void convert(const Mat& src, cv::OutputArray _dst,
             convertTo((const cv::bfloat16_t*)sptr, dptr, dtype, total, alpha, beta);
             break;
         default:
-            CV_Error(CV_StsNotImplemented, "unknown/unsupported depth");
+            CV_Error(cv::Error::StsNotImplemented, "unknown/unsupported depth");
         }
     }
 }