From 4c9af0232625d598889c4c4912f142e0dff14452 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Fri, 1 May 2015 20:03:57 -0700
Subject: [PATCH] dec_neon: add DC8uvNoTopLeft

~93% faster

Change-Id: Icf0fd5f85ac53c306a1b69d84275023e5b24a602
---
 src/dsp/dec_neon.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/dsp/dec_neon.c b/src/dsp/dec_neon.c
index 86a830da..36283425 100644
--- a/src/dsp/dec_neon.c
+++ b/src/dsp/dec_neon.c
@@ -1425,8 +1425,10 @@ static WEBP_INLINE void DC8(uint8_t* dst, int do_top, int do_left) {
     dc0 = vrshrn_n_u16(sum, 4);
   } else if (do_top) {
     dc0 = vrshrn_n_u16(sum_top, 3);
-  } else {
+  } else if (do_left) {
     dc0 = vrshrn_n_u16(sum_left, 3);
+  } else {
+    dc0 = vdup_n_u8(0x80);
   }
 
   {
@@ -1441,6 +1443,7 @@ static WEBP_INLINE void DC8(uint8_t* dst, int do_top, int do_left) {
 static void DC8uv(uint8_t* dst) { DC8(dst, 1, 1); }
 static void DC8uvNoTop(uint8_t* dst) { DC8(dst, 0, 1); }
 static void DC8uvNoLeft(uint8_t* dst) { DC8(dst, 1, 0); }
+static void DC8uvNoTopLeft(uint8_t* dst) { DC8(dst, 0, 0); }
 
 static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
 
@@ -1482,6 +1485,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
   VP8PredChroma8[1] = TM8uv;
   VP8PredChroma8[4] = DC8uvNoTop;
   VP8PredChroma8[5] = DC8uvNoLeft;
+  VP8PredChroma8[6] = DC8uvNoTopLeft;
 }
 
 #else  // !WEBP_USE_NEON