Merge pull request #25565 An error occurred from savuor:rv/hal_eq_hist

Merge pull request #25565
  
An error occurred
 
 from savuor/rv/hal_eq_hist

HAL for equalizeHist() added #25565
  
An error occurred
 


fixes #25530
  
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### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgproc/src/hal_replacement.hpp

@@ -903,6 +903,21 @@ inline int hal_ni_boxFilter(const uchar* src_data, size_t src_step, uchar* dst_d
 #define cv_hal_boxFilter hal_ni_boxFilter
 //! @endcond
 
+/**
+   @brief Equalizes the histogram of a grayscale image
+   @param src_data Source image data
+   @param src_step Source image step
+   @param dst_data Destination image data
+   @param dst_step Destination image step
+   @param width Source image width
+   @param height Source image height
+*/
+inline int hal_ni_equalize_hist(const uchar* src_data, size_t src_step, uchar* dst_data, size_t dst_step, int width, int height) { return CV_HAL_ERROR_NOT_IMPLEMENTED; }
+
+//! @cond IGNORED
+#define cv_hal_equalize_hist hal_ni_equalize_hist
+//! @endcond
+
 /**
    @brief Blurs an image using a generic Gaussian filter.
    @param src_data Source image data

modules/imgproc/src/histogram.cpp

@@ -3452,6 +3452,8 @@ void cv::equalizeHist( InputArray _src, OutputArray _dst )
     CV_OVX_RUN(!ovx::skipSmallImages<VX_KERNEL_EQUALIZE_HISTOGRAM>(src.cols, src.rows),
                openvx_equalize_hist(src, dst))
 
+    CALL_HAL(equalizeHist, cv_hal_equalize_hist, src.data, src.step, dst.data, dst.step, src.cols, src.rows);
+
     Mutex histogramLockInstance;
 
     const int hist_sz = EqualizeHistCalcHist_Invoker::HIST_SZ;