shithub: libvpx

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check_bsize_coverage cleanup.

Change-Id: Ib7803857b35c00e317c9deb8630e777e25eb278f

--- a/vp9/common/vp9_onyxc_int.h

+++ b/vp9/common/vp9_onyxc_int.h

@@ -255,25 +255,20 @@

   xd->left_seg_context = cm->left_seg_context + (mi_row & MI_MASK);

 }

-static int check_bsize_coverage(VP9_COMMON *cm, int mi_row, int mi_col,

-                                BLOCK_SIZE_TYPE bsize) {

-  int bsl = mi_width_log2(bsize), bs = 1 << bsl;

-  int ms = bs / 2;

+// return the node index in the prob tree for binary coding

+static int check_bsize_coverage(int bs, int mi_rows, int mi_cols,

+                                int mi_row, int mi_col) {

+  const int r = (mi_row + bs < mi_rows);

+  const int c = (mi_col + bs < mi_cols);

-  if ((mi_row + ms < cm->mi_rows) && (mi_col + ms < cm->mi_cols))

+  if (r && c)

     return 0;

-  // frame width/height are multiples of 8, hence 8x8 block should always

-  // pass the above check

-  assert(bsize > BLOCK_8X8);

+  if (c && !r)

+    return 1;  // only allow horizontal/split partition types

-  // return the node index in the prob tree for binary coding

-  // only allow horizontal/split partition types

-  if ((mi_col + ms < cm->mi_cols) && (mi_row + ms >= cm->mi_rows))

-    return 1;

-  // only allow vertical/split partition types

-  if ((mi_row + ms < cm->mi_rows) && (mi_col + ms >= cm->mi_cols))

-    return 2;

+  if (r && !c)

+    return 2;  // only allow vertical/split partition types

   return -1;

 }

--- a/vp9/decoder/vp9_decodframe.c

+++ b/vp9/decoder/vp9_decodframe.c

@@ -264,7 +264,7 @@

                             vp9_reader* r, BLOCK_SIZE_TYPE bsize) {

   VP9_COMMON *const pc = &pbi->common;

   MACROBLOCKD *const xd = &pbi->mb;

-  int bs = (1 << mi_width_log2(bsize)) / 2, n;

+  const int bs = (1 << mi_width_log2(bsize)) / 2;

   PARTITION_TYPE partition = PARTITION_NONE;

   BLOCK_SIZE_TYPE subsize;

@@ -276,7 +276,8 @@

       return;

   } else {

     int pl;

-    const int idx = check_bsize_coverage(pc, mi_row, mi_col, bsize);

+    const int idx = check_bsize_coverage(bs, pc->mi_rows, pc->mi_cols,

+                                         mi_row, mi_col);

     set_partition_seg_context(pc, xd, mi_row, mi_col);

     pl = partition_plane_context(xd, bsize);

@@ -311,13 +312,14 @@

       if (mi_col + bs < pc->mi_cols)

         decode_modes_b(pbi, mi_row, mi_col + bs, r, subsize);

       break;

-    case PARTITION_SPLIT:

+    case PARTITION_SPLIT: {

+      int n;

       for (n = 0; n < 4; n++) {

-        int j = n >> 1, i = n & 0x01;

+        const int j = n >> 1, i = n & 1;

         *(get_sb_index(xd, subsize)) = n;

         decode_modes_sb(pbi, mi_row + j * bs, mi_col + i * bs, r, subsize);

       }

-      break;

+    } break;

     default:

       assert(!"Invalid partition type");

   }

--- a/vp9/encoder/vp9_bitstream.c

+++ b/vp9/encoder/vp9_bitstream.c

@@ -628,7 +628,8 @@

   if (bsize >= BLOCK_8X8) {

     int pl;

-    const int idx = check_bsize_coverage(cm, mi_row, mi_col, bsize);

+    const int idx = check_bsize_coverage(bs, cm->mi_rows, cm->mi_cols,

+                                         mi_row, mi_col);

     set_partition_seg_context(cm, xd, mi_row, mi_col);

     pl = partition_plane_context(xd, bsize);

     // encode the partition information

-- 

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