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vp9_read_mode_info: limit scope of function params

replace VP9D_COMP usage with the (slightly) more targeted
VP9_COMMON/MACROBLCKD structures.

Change-Id: I09f6c4a5b0bcc20222210831b5b4c1582eced300

--- a/vp9/decoder/vp9_decodemv.c

+++ b/vp9/decoder/vp9_decodemv.c

@@ -666,10 +666,9 @@

   }

 }

-void vp9_read_mode_info(VP9D_COMP* pbi, int mi_row, int mi_col, vp9_reader *r) {

-  VP9_COMMON *const cm = &pbi->common;

-  MACROBLOCKD *const xd = &pbi->mb;

-  MODE_INFO *mi = xd->mi_8x8[0];

+void vp9_read_mode_info(VP9_COMMON *cm, MACROBLOCKD *xd,

+                        int mi_row, int mi_col, vp9_reader *r) {

+  MODE_INFO *const mi = xd->mi_8x8[0];

   const BLOCK_SIZE bsize = mi->mbmi.sb_type;

   const int bw = 1 << mi_width_log2(bsize);

   const int bh = 1 << mi_height_log2(bsize);

--- a/vp9/decoder/vp9_decodemv.h

+++ b/vp9/decoder/vp9_decodemv.h

@@ -14,8 +14,9 @@

 #include "vp9/decoder/vp9_onyxd_int.h"

 #include "vp9/decoder/vp9_dboolhuff.h"

-void vp9_prepare_read_mode_info(VP9D_COMP* pbi, vp9_reader *r);

+void vp9_prepare_read_mode_info(VP9D_COMP *pbi, vp9_reader *r);

-void vp9_read_mode_info(VP9D_COMP* pbi, int mi_row, int mi_col, vp9_reader *r);

+void vp9_read_mode_info(VP9_COMMON *cm, MACROBLOCKD *xd,

+                        int mi_row, int mi_col, vp9_reader *r);

 #endif  // VP9_DECODER_VP9_DECODEMV_H_

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

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

@@ -225,6 +225,7 @@

 static void decode_modes_b(VP9D_COMP *pbi, int tile_col,

                            int mi_row, int mi_col,

                            vp9_reader *r, BLOCK_SIZE bsize, int index) {

+  VP9_COMMON *const cm = &pbi->common;

   MACROBLOCKD *const xd = &pbi->mb;

   const int less8x8 = bsize < BLOCK_8X8;

   MB_MODE_INFO *mbmi;

@@ -235,7 +236,7 @@

       return;

   set_offsets(pbi, bsize, tile_col, mi_row, mi_col);

-  vp9_read_mode_info(pbi, mi_row, mi_col, r);

+  vp9_read_mode_info(cm, xd, mi_row, mi_col, r);

   if (less8x8)

     bsize = BLOCK_8X8;