Merge changes If8887e1d,I36bfc9c8,I3d1e6c42 * changes: vp9_dthread: simplify loop_filter_row_worker signature simplify vp9_loop_filter_worker signature vp9_decodeframe: simplify tile_work_hook signature

diff --git a/vp9/common/vp9_loopfilter.c b/vp9/common/vp9_loopfilter.c
index 3b39d42..a6862e4 100644
--- a/vp9/common/vp9_loopfilter.c
+++ b/vp9/common/vp9_loopfilter.c

@@ -1247,9 +1247,8 @@
                        y_only);
 }
 
-int vp9_loop_filter_worker(void *arg1, void *arg2) {
-  LFWorkerData *const lf_data = (LFWorkerData*)arg1;
-  (void)arg2;
+int vp9_loop_filter_worker(LFWorkerData *const lf_data, void *unused) {
+  (void)unused;
   vp9_loop_filter_rows(lf_data->frame_buffer, lf_data->cm, lf_data->planes,
                        lf_data->start, lf_data->stop, lf_data->y_only);
   return 1;

diff --git a/vp9/common/vp9_loopfilter.h b/vp9/common/vp9_loopfilter.h
index 6fa2773..0f3838b 100644
--- a/vp9/common/vp9_loopfilter.h
+++ b/vp9/common/vp9_loopfilter.h

@@ -129,8 +129,8 @@
   int num_lf_workers;
 } LFWorkerData;
 
-// Operates on the rows described by LFWorkerData passed as 'arg1'.
-int vp9_loop_filter_worker(void *arg1, void *arg2);
+// Operates on the rows described by 'lf_data'.
+int vp9_loop_filter_worker(LFWorkerData *const lf_data, void *unused);
 #ifdef __cplusplus
 }  // extern "C"
 #endif

diff --git a/vp9/decoder/vp9_decodeframe.c b/vp9/decoder/vp9_decodeframe.c
index aecd906..7b1ed5a 100644
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c

@@ -960,9 +960,8 @@
   return vp9_reader_find_end(&tile_data->bit_reader);
 }
 
-static int tile_worker_hook(void *arg1, void *arg2) {
-  TileWorkerData *const tile_data = (TileWorkerData*)arg1;
-  const TileInfo *const tile = (TileInfo*)arg2;
+static int tile_worker_hook(TileWorkerData *const tile_data,
+                            const TileInfo *const tile) {
   int mi_row, mi_col;
 
   for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end;

diff --git a/vp9/decoder/vp9_dthread.c b/vp9/decoder/vp9_dthread.c
index 1572aa4..6635880 100644
--- a/vp9/decoder/vp9_dthread.c
+++ b/vp9/decoder/vp9_dthread.c

@@ -121,10 +121,10 @@
 }
 
 // Row-based multi-threaded loopfilter hook
-static int loop_filter_row_worker(void *arg1, void *arg2) {
-  TileWorkerData *const tile_data = (TileWorkerData*)arg1;
+static int loop_filter_row_worker(TileWorkerData *const tile_data,
+                                  void *unused) {
   LFWorkerData *const lf_data = &tile_data->lfdata;
-  (void) arg2;
+  (void)unused;
   loop_filter_rows_mt(lf_data->frame_buffer, lf_data->cm, lf_data->planes,
                       lf_data->start, lf_data->stop, lf_data->y_only,
                       lf_data->lf_sync, lf_data->num_lf_workers);