implemented Malvar, He, and Cutler Bayer Demosaicing on gpu

modules/gpu/perf/perf_imgproc.cpp

@@ -1374,6 +1374,50 @@ PERF_TEST_P(Sz_Depth_Code, ImgProc_CvtColorBayer,
     }
 }
 
+CV_ENUM(DemosaicingCode,
+        cv::COLOR_BayerBG2BGR, cv::COLOR_BayerGB2BGR, cv::COLOR_BayerRG2BGR, cv::COLOR_BayerGR2BGR,
+        cv::COLOR_BayerBG2GRAY, cv::COLOR_BayerGB2GRAY, cv::COLOR_BayerRG2GRAY, cv::COLOR_BayerGR2GRAY,
+        cv::gpu::COLOR_BayerBG2BGR_MHT, cv::gpu::COLOR_BayerGB2BGR_MHT, cv::gpu::COLOR_BayerRG2BGR_MHT, cv::gpu::COLOR_BayerGR2BGR_MHT,
+        cv::gpu::COLOR_BayerBG2GRAY_MHT, cv::gpu::COLOR_BayerGB2GRAY_MHT, cv::gpu::COLOR_BayerRG2GRAY_MHT, cv::gpu::COLOR_BayerGR2GRAY_MHT)
+
+DEF_PARAM_TEST(Sz_Code, cv::Size, DemosaicingCode);
+
+PERF_TEST_P(Sz_Code, ImgProc_Demosaicing,
+            Combine(GPU_TYPICAL_MAT_SIZES,
+                    ValuesIn(DemosaicingCode::all())))
+{
+    const cv::Size size = GET_PARAM(0);
+    const int code = GET_PARAM(1);
+
+    cv::Mat src(size, CV_8UC1);
+    declare.in(src, WARMUP_RNG);
+
+    if (PERF_RUN_GPU())
+    {
+        const cv::gpu::GpuMat d_src(src);
+        cv::gpu::GpuMat dst;
+
+        TEST_CYCLE() cv::gpu::demosaicing(d_src, dst, code);
+
+        GPU_SANITY_CHECK(dst);
+    }
+    else
+    {
+        if (code >= cv::COLOR_COLORCVT_MAX)
+        {
+            FAIL_NO_CPU();
+        }
+        else
+        {
+            cv::Mat dst;
+
+            TEST_CYCLE() cv::cvtColor(src, dst, code);
+
+            CPU_SANITY_CHECK(dst);
+        }
+    }
+}
+
 //////////////////////////////////////////////////////////////////////
 // SwapChannels