CV_ColorCvtBaseTest: added methods for 8u implementations

modules/imgproc/test/test_color.cpp

@@ -68,6 +68,14 @@ protected:
     // called from default implementation of convert_backward
     virtual void convert_row_abc2bgr_32f_c3( const float* src_row, float* dst_row, int n );
 
+    // called from default implementation of convert_backward
+    // for cases of bit-exact functions
+    virtual int convert_row_abc2bgr_8u_c3( const uchar* src_row, uchar* dst_row, int n );
+
+    // called from default implementation of convert_forward
+    // for cases of bit-exact functions
+    virtual int convert_row_bgr2abc_8u_c3(const uchar *src_row, uchar *dst_row, int n );
+
     const char* fwd_code_str;
     const char* inv_code_str;
 
@@ -226,6 +234,9 @@ void CV_ColorCvtBaseTest::convert_forward( const Mat& src, Mat& dst )
                 const uchar* src_row = src.ptr(i);
                 uchar* dst_row = dst.ptr(i);
 
+                int processed = convert_row_bgr2abc_8u_c3( src_row, dst_row, cols );
+                if(processed != cols)
+                {
                     for( j = 0; j < cols; j++ )
                     {
                         src_buf[j*3] = src_row[j*cn + blue_idx]*c8u;
@@ -241,6 +252,7 @@ void CV_ColorCvtBaseTest::convert_forward( const Mat& src, Mat& dst )
                         dst_row[j] = saturate_cast<uchar>(t);
                     }
                 }
+            }
             break;
         case CV_16U:
             {
@@ -297,6 +309,19 @@ void CV_ColorCvtBaseTest::convert_row_abc2bgr_32f_c3( const float* /*src_row*/,
 }
 
 
+int CV_ColorCvtBaseTest::convert_row_abc2bgr_8u_c3(const uchar * /*src_row*/,
+                                                   uchar * /*dst_row*/, int /*n*/ )
+{
+    return 0;
+}
+
+
+int CV_ColorCvtBaseTest::convert_row_bgr2abc_8u_c3( const uchar* /*src_row*/,
+                                                    uchar* /*dst_row*/, int /*n*/ )
+{
+    return 0;
+}
+
 void CV_ColorCvtBaseTest::convert_backward( const Mat& src, const Mat& dst, Mat& dst2 )
 {
     if( custom_inv_transform )
@@ -321,6 +346,10 @@ void CV_ColorCvtBaseTest::convert_backward( const Mat& src, const Mat& dst, Mat&
                     const uchar* src_row = dst.ptr(i);
                     uchar* dst_row = dst2.ptr(i);
 
+                    int processed = convert_row_abc2bgr_8u_c3(src_row, dst_row, dst_cols);
+
+                    if(processed != dst_cols)
+                    {
                         for( j = 0; j < cols_n; j++ )
                             src_buf[j] = src_row[j];
 
@@ -338,6 +367,7 @@ void CV_ColorCvtBaseTest::convert_backward( const Mat& src, const Mat& dst, Mat&
                                 dst_row[j*cn + 3] = 255;
                         }
                     }
+                }
                 break;
             case CV_16U:
                 {