shithub: libvpx

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vp9_reconintra: specialize d207 4x4

based on webp's HU4()

Change-Id: I2401ef307cd94e70cc7904f55954af04290c8af9

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

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

@@ -363,6 +363,23 @@

 #define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)

 #define AVG2(a, b) (((a) + (b) + 1) >> 1)

+void vp9_d207_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];

+  (void)above;

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

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

+  DST(2, 1) = DST(0, 2) = AVG2(K, L);

+  DST(1, 0) =             AVG3(I, J, K);

+  DST(3, 0) = DST(1, 1) = AVG3(J, K, L);

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

+  DST(3, 2) = DST(2, 2) =

+      DST(0, 3) = DST(1, 3) = DST(2, 3) = DST(3, 3) = L;

+}

+

 static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,

                                   const uint8_t *above, const uint8_t *left) {

   int r, c;

@@ -390,7 +407,7 @@

     for (c = 0; c < bs - 2; ++c)

       dst[r * stride + c] = dst[(r + 1) * stride + c - 2];

 }

-intra_pred_allsizes(d207)

+intra_pred_no_4x4(d207)

 void vp9_d63_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,

                              const uint8_t *above, const uint8_t *left) {