moved gpu cvtColor tests to separate file

added more tests for gpu cvtColor
fixed RGB->YUV conversion

modules/gpu/src/opencv2/gpu/device/detail/color_detail.hpp

@@ -455,22 +455,7 @@ namespace cv { namespace gpu { namespace device
             dst.y = saturate_cast<T>(Cr);
             dst.z = saturate_cast<T>(Cb);
         }
-        template <int bidx> static __device__ uint RGB2YUVConvert(uint src)
-        {
-            const uint delta = ColorChannel<uchar>::half() * (1 << yuv_shift);
-
-            const uint Y = CV_DESCALE((0xffu & src) * c_RGB2YUVCoeffs_i[bidx^2] + (0xffu & (src >> 8)) * c_RGB2YUVCoeffs_i[1] + (0xffu & (src >> 16)) * c_RGB2YUVCoeffs_i[bidx], yuv_shift);
-            const uint Cr = CV_DESCALE(((0xffu & (src >> ((bidx ^ 2) * 8))) - Y) * c_RGB2YUVCoeffs_i[3] + delta, yuv_shift);
-            const uint Cb = CV_DESCALE(((0xffu & (src >> (bidx * 8))) - Y) * c_RGB2YUVCoeffs_i[4] + delta, yuv_shift);
-
-            uint dst = 0;
-
-            dst |= saturate_cast<uchar>(Y);
-            dst |= saturate_cast<uchar>(Cr) << 8;
-            dst |= saturate_cast<uchar>(Cb) << 16;
 
-            return dst;
-        }
         template <int bidx, typename D> static __device__ __forceinline__ void RGB2YUVConvert(const float* src, D& dst)
         {
             dst.x = src[0] * c_RGB2YUVCoeffs_f[bidx^2] + src[1] * c_RGB2YUVCoeffs_f[1] + src[2] * c_RGB2YUVCoeffs_f[bidx];
@@ -487,13 +472,6 @@ namespace cv { namespace gpu { namespace device
                 return dst;
             }
         };
-        template <int bidx> struct RGB2YUV<uchar, 4, 4, bidx> : unary_function<uint, uint>
-        {
-            __device__ __forceinline__ uint operator ()(uint src) const
-            {
-                return RGB2YUVConvert<bidx>(src);
-            }
-        };
     }
 
 #define OPENCV_GPU_IMPLEMENT_RGB2YUV_TRAITS(name, scn, dcn, bidx) \
@@ -527,9 +505,9 @@ namespace cv { namespace gpu { namespace device
             const int y = 0xff & (src >> 8);
             const int z = 0xff & (src >> 16);
 
-            const uint b = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[3], yuv_shift);
-            const uint g = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[2] + (y - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[1], yuv_shift);
-            const uint r = x + CV_DESCALE((y - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[0], yuv_shift);
+            const int b = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[3], yuv_shift);
+            const int g = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[2] + (y - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[1], yuv_shift);
+            const int r = x + CV_DESCALE((y - ColorChannel<uchar>::half()) * c_YUV2RGBCoeffs_i[0], yuv_shift);
 
             uint dst = 0xffu << 24;
 
@@ -600,9 +578,9 @@ namespace cv { namespace gpu { namespace device
         {
             const int delta = ColorChannel<uchar>::half() * (1 << yuv_shift);
 
-            const uint Y = CV_DESCALE((0xffu & src) * c_RGB2YCrCbCoeffs_i[bidx^2] + (0xffu & (src >> 8)) * c_RGB2YCrCbCoeffs_i[1] + (0xffu & (src >> 16)) * c_RGB2YCrCbCoeffs_i[bidx], yuv_shift);
-            const uint Cr = CV_DESCALE(((0xffu & (src >> ((bidx ^ 2) * 8))) - Y) * c_RGB2YCrCbCoeffs_i[3] + delta, yuv_shift);
-            const uint Cb = CV_DESCALE(((0xffu & (src >> (bidx * 8))) - Y) * c_RGB2YCrCbCoeffs_i[4] + delta, yuv_shift);
+            const int Y = CV_DESCALE((0xffu & src) * c_RGB2YCrCbCoeffs_i[bidx^2] + (0xffu & (src >> 8)) * c_RGB2YCrCbCoeffs_i[1] + (0xffu & (src >> 16)) * c_RGB2YCrCbCoeffs_i[bidx], yuv_shift);
+            const int Cr = CV_DESCALE(((0xffu & (src >> ((bidx ^ 2) * 8))) - Y) * c_RGB2YCrCbCoeffs_i[3] + delta, yuv_shift);
+            const int Cb = CV_DESCALE(((0xffu & (src >> (bidx * 8))) - Y) * c_RGB2YCrCbCoeffs_i[4] + delta, yuv_shift);
 
             uint dst = 0;
 
@@ -668,9 +646,9 @@ namespace cv { namespace gpu { namespace device
             const int y = 0xff & (src >> 8);
             const int z = 0xff & (src >> 16);
 
-            const uint b = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[3], yuv_shift);
-            const uint g = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[2] + (y - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[1], yuv_shift);
-            const uint r = x + CV_DESCALE((y - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[0], yuv_shift);
+            const int b = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[3], yuv_shift);
+            const int g = x + CV_DESCALE((z - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[2] + (y - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[1], yuv_shift);
+            const int r = x + CV_DESCALE((y - ColorChannel<uchar>::half()) * c_YCrCb2RGBCoeffs_i[0], yuv_shift);
 
             uint dst = 0xffu << 24;