From 102123821def76227f0f290e64b7e570c7c374b9 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Fri, 29 May 2015 20:09:51 -0700
Subject: [PATCH] vp9_reconintra: specialize d63 4x4

based on webp's VL4()

Change-Id: Ibab962053843eae8752b4e74b6481a53bb034ae9
---
 vp9/common/vp9_reconintra.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/vp9/common/vp9_reconintra.c b/vp9/common/vp9_reconintra.c
index bb94c2cfe..bea239728 100644
--- a/vp9/common/vp9_reconintra.c
+++ b/vp9/common/vp9_reconintra.c
@@ -361,6 +361,7 @@ static INLINE void highbd_dc_predictor(uint16_t *dst, ptrdiff_t stride,
 
 #define DST(x, y) dst[(x) + (y) * stride]
 #define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2)
+#define AVG2(a, b) (((a) + (b) + 1) >> 1)
 
 static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                   const uint8_t *above, const uint8_t *left) {
@@ -391,6 +392,30 @@ static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
 }
 intra_pred_allsizes(d207)
 
+void vp9_d63_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,
+                             const uint8_t *above, const uint8_t *left) {
+  const int A = above[0];
+  const int B = above[1];
+  const int C = above[2];
+  const int D = above[3];
+  const int E = above[4];
+  const int F = above[5];
+  const int G = above[6];
+  const int H = above[7];
+  (void)left;
+  DST(0, 0) =             AVG2(A, B);
+  DST(1, 0) = DST(0, 2) = AVG2(B, C);
+  DST(2, 0) = DST(1, 2) = AVG2(C, D);
+  DST(3, 0) = DST(2, 2) = AVG2(D, E);
+
+  DST(0, 1) =             AVG3(A, B, C);
+  DST(1, 1) = DST(0, 3) = AVG3(B, C, D);
+  DST(2, 1) = DST(1, 3) = AVG3(C, D, E);
+  DST(3, 1) = DST(2, 3) = AVG3(D, E, F);
+              DST(3, 2) = AVG3(E, F, G);
+              DST(3, 3) = AVG3(F, G, H);
+}
+
 static INLINE void d63_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                  const uint8_t *above, const uint8_t *left) {
   int r, c;
@@ -405,7 +430,7 @@ static INLINE void d63_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
     dst += stride;
   }
 }
-intra_pred_allsizes(d63)
+intra_pred_no_4x4(d63)
 
 void vp9_d45_predictor_4x4_c(uint8_t *dst, ptrdiff_t stride,
                              const uint8_t *above, const uint8_t *left) {