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

vp9/decoder/vp9_decodemv.c

@@ -666,10 +666,9 @@ 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) {
-  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);

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_

vp9/decoder/vp9_decodframe.c

@@ -225,6 +225,7 @@ static void set_ref(VP9D_COMP *pbi, int i, int mi_row, int mi_col) {
 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 @@ static void decode_modes_b(VP9D_COMP *pbi, int tile_col,
       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;