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vp9_reconintra: specialize d153 4x4

based on webp's HD4()

Change-Id: Icba1e21ec4b8f5026dc92e49741a68b059c8b9b1

--- a/vp9/common/vp9_reconintra.c

+++ b/vp9/common/vp9_reconintra.c

@@ -519,6 +519,30 @@

 }

 intra_pred_allsizes(d135)

+void vp9_d153_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,

+                              const uint8_t *above, const uint8_t *left) {

+  const int I = left[0];

+  const int J = left[1];

+  const int K = left[2];

+  const int L = left[3];

+  const int X = above[-1];

+  const int A = above[0];

+  const int B = above[1];

+  const int C = above[2];

+

+  DST(0, 0) = DST(2, 1) = AVG2(I, X);

+  DST(0, 1) = DST(2, 2) = AVG2(J, I);

+  DST(0, 2) = DST(2, 3) = AVG2(K, J);

+  DST(0, 3)             = AVG2(L, K);

+

+  DST(3, 0)             = AVG3(A, B, C);

+  DST(2, 0)             = AVG3(X, A, B);

+  DST(1, 0) = DST(3, 1) = AVG3(I, X, A);

+  DST(1, 1) = DST(3, 2) = AVG3(J, I, X);

+  DST(1, 2) = DST(3, 3) = AVG3(K, J, I);

+  DST(1, 3)             = AVG3(L, K, J);

+}

+

 static INLINE void d153_predictor(uint8_t *dst, ptrdiff_t stride, int bs,

                                   const uint8_t *above, const uint8_t *left) {

   int r, c;

@@ -544,7 +568,7 @@

     dst += stride;

   }

 }

-intra_pred_allsizes(d153)

+intra_pred_no_4x4(d153)

 static INLINE void v_predictor(uint8_t *dst, ptrdiff_t stride, int bs,

                                const uint8_t *above, const uint8_t *left) {