libwebp: upgrade from 0.6.0-rc1 to 0.6.0-final

third_party/libwebp/dsp/filters_neon.c

Index: third_party/libwebp/dsp/filters_neon.c
diff --git a/third_party/libwebp/dsp/filters_neon.c b/third_party/libwebp/dsp/filters_neon.c
index 7e1338fc835a522e8c139bbd172863dc49401e58..4d6e50cc764106d1a6099199b9e53bc8ab4bfb7b 100644
--- a/third_party/libwebp/dsp/filters_neon.c
+++ b/third_party/libwebp/dsp/filters_neon.c
@@ -248,6 +248,12 @@ static void VerticalUnfilter_NEON(const uint8_t* prev, const uint8_t* in,
   }
 }
 
+// GradientUnfilter_NEON is correct but slower than the C-version,
+// at least on ARM64. For armv7, it's a wash.
+// So best is to disable it for now, but keep the idea around...
+// #define USE_GRADIENT_UNFILTER
+
+#if defined(USE_GRADIENT_UNFILTER)
 #define GRAD_PROCESS_LANE(L)  do {                                             \
   const uint8x8_t tmp1 = ROTATE_RIGHT_N(pred, 1);  /* rotate predictor in */   \
   const int16x8_t tmp2 = vaddq_s16(BC, U8_TO_S16(tmp1));                       \
@@ -295,6 +301,8 @@ static void GradientUnfilter_NEON(const uint8_t* prev, const uint8_t* in,
   }
 }
 
+#endif   // USE_GRADIENT_UNFILTER
+
 //------------------------------------------------------------------------------
 // Entry point
 
@@ -303,7 +311,9 @@ extern void VP8FiltersInitNEON(void);
 WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInitNEON(void) {
   WebPUnfilters[WEBP_FILTER_HORIZONTAL] = HorizontalUnfilter_NEON;
   WebPUnfilters[WEBP_FILTER_VERTICAL] = VerticalUnfilter_NEON;
+#if defined(USE_GRADIENT_UNFILTER)
   WebPUnfilters[WEBP_FILTER_GRADIENT] = GradientUnfilter_NEON;
+#endif
 
   WebPFilters[WEBP_FILTER_HORIZONTAL] = HorizontalFilter_NEON;
   WebPFilters[WEBP_FILTER_VERTICAL] = VerticalFilter_NEON;