vp9_reconintra: specialize d207 4x4

based on webp's HU4()

Change-Id: I2401ef307cd94e70cc7904f55954af04290c8af9

diff --git a/vp9/common/vp9_reconintra.c b/vp9/common/vp9_reconintra.c
index de9ba43..4c1dce9 100644 (file)
--- a/vp9/common/vp9_reconintra.c
+++ b/vp9/common/vp9_reconintra.c
@@ -363,6 +363,23 @@ static INLINE void highbd_dc_predictor(uint16_t *dst, ptrdiff_t stride,
 #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 @@ static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
     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) {