Add dynamic range comment to vp9_int_pro_col

Change-Id: If14d9f874bd0bf2c5a455982088fd70591f5ea5a

diff --git a/vp9/encoder/vp9_avg.c b/vp9/encoder/vp9_avg.c
index 223c923a45f5cd1ad284c755d39eee349cf4a2c9..99bc12e81b95dae4c8a0d0db8b8097c6a2f8715c 100644 (file)
--- a/vp9/encoder/vp9_avg.c
+++ b/vp9/encoder/vp9_avg.c
@@ -142,9 +142,11 @@ void vp9_int_pro_row_c(int16_t *hbuf, uint8_t const *ref,
   }
 }
 
+// width: value range {16, 32, 64}.
 int16_t vp9_int_pro_col_c(uint8_t const *ref, const int width) {
   int idx;
   int16_t sum = 0;
+  // sum: 14 bit, dynamic range [0, 16320]
   for (idx = 0; idx < width; ++idx)
     sum += ref[idx];
   return sum;