shithub: libvpx

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Add dynamic range comment to vp9_int_pro_row

Change-Id: Icaa643568159c4e2db24eef42090b002ae02a45e

--- a/vp9/encoder/vp9_avg.c

+++ b/vp9/encoder/vp9_avg.c

@@ -128,15 +128,18 @@

 }

 // Integer projection onto row vectors.

-void vp9_int_pro_row_c(int16_t *hbuf, uint8_t const *ref,

+// height: value range {16, 32, 64}.

+void vp9_int_pro_row_c(int16_t hbuf[16], uint8_t const *ref,

                        const int ref_stride, const int height) {

   int idx;

-  const int norm_factor = MAX(8, height >> 1);

+  const int norm_factor = height >> 1;

   for (idx = 0; idx < 16; ++idx) {

     int i;

     hbuf[idx] = 0;

+    // hbuf[idx]: 14 bit, dynamic range [0, 16320].

     for (i = 0; i < height; ++i)

       hbuf[idx] += ref[i * ref_stride];

+    // hbuf[idx]: 9 bit, dynamic range [0, 510].

     hbuf[idx] /= norm_factor;

     ++ref;

   }