fixed a few warnings reported by Oleg; restored SSE2 optimization in FAST

modules/features2d/src/fast.cpp

@@ -89,7 +89,9 @@ void FAST_t(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, bo
         if( i < img.rows - 3 )
         {
             j = 3;
-    #if 0 //CV_SSE2
+    #if CV_SSE2
+            if( patternSize == 16 )
+            {
             for(; j < img.cols - 16 - 3; j += 16, ptr += 16)
             {
                 __m128i m0, m1;
@@ -145,6 +147,7 @@ void FAST_t(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, bo
                             curr[j+k] = (uchar)cornerScore<patternSize>(ptr+k, pixel, threshold);
                     }
             }
+            }
     #endif
             for( ; j < img.cols - 3; j++, ptr++ )
             {

modules/features2d/src/fast_score.cpp

@@ -78,6 +78,7 @@ void makeOffsets(int pixel[25], int rowStride, int patternSize)
         pixel[k] = pixel[k - patternSize];
 }
 
+#if 0
 static void testCorner(const uchar* ptr, const int pixel[], int K, int N, int threshold) {
     // check that with the computed "threshold" the pixel is still a corner
     // and that with the increased-by-1 "threshold" the pixel is not a corner anymore
@@ -111,6 +112,7 @@ static void testCorner(const uchar* ptr, const int pixel[], int K, int N, int th
                    (delta == 1 && std::max(c0, c1) <= K) );
     }
 }
+#endif
 
 template<>
 int cornerScore<16>(const uchar* ptr, const int pixel[], int threshold)

modules/highgui/src/cap_v4l.cpp

@@ -1432,7 +1432,7 @@ move_420_block(int yTL, int yTR, int yBL, int yBR, int u, int v,
 
 static inline void
 move_411_block(int yTL, int yTR, int yBL, int yBR, int u, int v,
-           int rowPixels, unsigned char * rgb)
+           int /*rowPixels*/, unsigned char * rgb)
 {
     const int rvScale = 91881;
     const int guScale = -22553;