From 8eb2c8998c23700f8ef143eb407723d483b2adcb Mon Sep 17 00:00:00 2001
From: Alexander Smorkalov <alexander.smorkalov@opencv.ai>
Date: Thu, 9 Jul 2026 16:51:20 +0300
Subject: [PATCH] Drop HAL for cv_hal_cvtColorYUV2Gray as it's just copy.

---
 hal/ipp/include/ipp_hal_imgproc.hpp        |  4 ----
 hal/ipp/src/color_ipp.cpp                  | 14 --------------
 modules/imgproc/src/color_yuv.dispatch.cpp |  1 -
 modules/imgproc/src/hal_replacement.hpp    | 11 -----------
 4 files changed, 30 deletions(-)

diff --git a/hal/ipp/include/ipp_hal_imgproc.hpp b/hal/ipp/include/ipp_hal_imgproc.hpp
index 3e5fc137a0..70c643b830 100644
--- a/hal/ipp/include/ipp_hal_imgproc.hpp
+++ b/hal/ipp/include/ipp_hal_imgproc.hpp
@@ -138,10 +138,6 @@ int ipp_hal_cvtRGBAtoMultipliedRGBA(const uchar * src_data, size_t src_step, uch
 #undef cv_hal_cvtRGBAtoMultipliedRGBA
 #define cv_hal_cvtRGBAtoMultipliedRGBA ipp_hal_cvtRGBAtoMultipliedRGBA
 
-int ipp_hal_cvtColorYUV2Gray(const uchar * src_data, size_t src_step, uchar * dst_data, size_t dst_step, int width, int height);
-#undef cv_hal_cvtColorYUV2Gray
-#define cv_hal_cvtColorYUV2Gray ipp_hal_cvtColorYUV2Gray
-
 #endif // IPP_VERSION_X100 >= 700
 
 #endif //__IPP_HAL_IMGPROC_HPP__
diff --git a/hal/ipp/src/color_ipp.cpp b/hal/ipp/src/color_ipp.cpp
index 7214bfc645..ad791b613e 100644
--- a/hal/ipp/src/color_ipp.cpp
+++ b/hal/ipp/src/color_ipp.cpp
@@ -955,18 +955,4 @@ int ipp_hal_cvtLabtoBGR(const uchar * src_data, size_t src_step, uchar * dst_dat
     return CV_HAL_ERROR_NOT_IMPLEMENTED;
 }
 
-int ipp_hal_cvtColorYUV2Gray(const uchar * src_data, size_t src_step, uchar * dst_data, size_t dst_step,
-                             int width, int height)
-{
-    CV_HAL_CHECK_USE_IPP();
-
-#if IPP_VERSION_X100 >= 201700
-    if (CV_INSTRUMENT_FUN_IPP(ippiCopy_8u_C1R_L, src_data, (IppSizeL)src_step, dst_data, (IppSizeL)dst_step,
-                              ippiSizeL(width, height)) >= 0)
-        return CV_HAL_ERROR_OK;
-#endif
-
-    return CV_HAL_ERROR_NOT_IMPLEMENTED;
-}
-
 #endif // IPP_VERSION_X100 >= 700
diff --git a/modules/imgproc/src/color_yuv.dispatch.cpp b/modules/imgproc/src/color_yuv.dispatch.cpp
index f1f91f51db..361eca16e0 100644
--- a/modules/imgproc/src/color_yuv.dispatch.cpp
+++ b/modules/imgproc/src/color_yuv.dispatch.cpp
@@ -417,7 +417,6 @@ void cvtColorYUV2Gray_420( InputArray _src, OutputArray _dst )
 {
     CvtHelper< Set<1>, Set<1>, Set<CV_8U>, FROM_YUV > h(_src, _dst, 1);
 
-    CALL_HAL(cvtColorYUV2Gray, cv_hal_cvtColorYUV2Gray, h.src.data, h.src.step, h.dst.data, h.dst.step, h.dstSz.width, h.dstSz.height);
     h.src(Range(0, h.dstSz.height), Range::all()).copyTo(h.dst);
 }
 
diff --git a/modules/imgproc/src/hal_replacement.hpp b/modules/imgproc/src/hal_replacement.hpp
index 0e2bc4f305..4d3fe4477d 100644
--- a/modules/imgproc/src/hal_replacement.hpp
+++ b/modules/imgproc/src/hal_replacement.hpp
@@ -1067,16 +1067,6 @@ inline int hal_ni_cvtRGBAtoMultipliedRGBA(const uchar * src_data, size_t src_ste
  */
 inline int hal_ni_cvtMultipliedRGBAtoRGBA(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; }
 
-/** @brief Extract Y-plane from YUV 4:2:0 image.
-   @param src_data Source image data pointer (points to Y plane).
-   @param src_step Source step.
-   @param dst_data Destination data pointer.
-   @param dst_step Destination step.
-   @param width Image width.
-   @param height Image height (of the Y plane, not the full YUV image).
- */
-inline int hal_ni_cvtColorYUV2Gray(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_cvtBGRtoBGR hal_ni_cvtBGRtoBGR
 #define cv_hal_cvtBGRtoBGR5x5 hal_ni_cvtBGRtoBGR5x5
@@ -1110,7 +1100,6 @@ inline int hal_ni_cvtColorYUV2Gray(const uchar * src_data, size_t src_step, ucha
 #define cv_hal_cvtOnePlaneBGRtoYUVApprox hal_ni_cvtOnePlaneBGRtoYUVApprox
 #define cv_hal_cvtRGBAtoMultipliedRGBA hal_ni_cvtRGBAtoMultipliedRGBA
 #define cv_hal_cvtMultipliedRGBAtoRGBA hal_ni_cvtMultipliedRGBAtoRGBA
-#define cv_hal_cvtColorYUV2Gray hal_ni_cvtColorYUV2Gray
 //! @endcond
 
 /**