Merge "Adds a source variance computation function"

vp9/common/vp9_common_data.c

@@ -35,6 +35,9 @@ const int num_8x8_blocks_high_lookup[BLOCK_SIZE_TYPES] =
 const int size_group_lookup[BLOCK_SIZE_TYPES] =
   {0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3};
 
+const int num_pels_log2_lookup[BLOCK_SIZE_TYPES] =
+  {4, 5, 5, 6, 7, 7, 8, 9, 9, 10, 11, 11, 12};
+
 
 const PARTITION_TYPE partition_lookup[][BLOCK_SIZE_TYPES] = {
   {  // 4X4

vp9/common/vp9_common_data.h

@@ -22,6 +22,7 @@ extern const int num_8x8_blocks_high_lookup[BLOCK_SIZE_TYPES];
 extern const int num_4x4_blocks_high_lookup[BLOCK_SIZE_TYPES];
 extern const int num_4x4_blocks_wide_lookup[BLOCK_SIZE_TYPES];
 extern const int size_group_lookup[BLOCK_SIZE_TYPES];
+extern const int num_pels_log2_lookup[BLOCK_SIZE_TYPES];
 
 extern const PARTITION_TYPE partition_lookup[][BLOCK_SIZE_TYPES];
 

vp9/encoder/vp9_encodeframe.c

@@ -60,8 +60,25 @@ static void adjust_act_zbin(VP9_COMP *cpi, MACROBLOCK *x);
  * Eventually this should be replaced by custom no-reference routines,
  *  which will be faster.
  */
-static const uint8_t VP9_VAR_OFFS[16] = {128, 128, 128, 128, 128, 128, 128, 128,
-    128, 128, 128, 128, 128, 128, 128, 128};
+static const uint8_t VP9_VAR_OFFS[64] = {
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128,
+  128, 128, 128, 128, 128, 128, 128, 128
+};
+
+static unsigned int get_sb_variance(VP9_COMP *cpi, MACROBLOCK *x,
+                                    BLOCK_SIZE_TYPE bs) {
+  unsigned int var, sse;
+  var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
+                           x->plane[0].src.stride,
+                           VP9_VAR_OFFS, 0, &sse);
+  return var >> num_pels_log2_lookup[bs];
+}
 
 // Original activity measure from Tim T's code.
 static unsigned int tt_activity_measure(VP9_COMP *cpi, MACROBLOCK *x) {