scan order table lookup same for encoder and decoder

Change-Id: I473947b5ca70b7a81151926284bff86f8555492a

vp9/common/vp9_entropy.h

@@ -186,23 +186,19 @@ static int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
 static void get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
                      PLANE_TYPE type, int block_idx,
                      const int16_t **scan, const int16_t **scan_nb) {
-  switch (tx_size) {
-    case TX_4X4:
-      get_scan_nb_4x4(get_tx_type_4x4(type, xd, block_idx), scan, scan_nb);
-      break;
-    case TX_8X8:
-      get_scan_nb_8x8(get_tx_type_8x8(type, xd), scan, scan_nb);
-      break;
-    case TX_16X16:
-      get_scan_nb_16x16(get_tx_type_16x16(type, xd), scan, scan_nb);
-      break;
-    case TX_32X32:
-      *scan = vp9_default_scan_32x32;
-      *scan_nb = vp9_default_scan_32x32_neighbors;
-      break;
-    default:
-      assert(!"Invalid transform size.");
+  const MODE_INFO *const mi = xd->mi_8x8[0];
+  const MB_MODE_INFO *const mbmi = &mi->mbmi;
+  const scan_order *so;
+
+  if (is_inter_block(mbmi) || type != PLANE_TYPE_Y_WITH_DC || xd->lossless) {
+    so = &inter_scan_orders[tx_size];
+  } else {
+    const MB_PREDICTION_MODE mode =
+        mbmi->sb_type < BLOCK_8X8 ? mi->bmi[block_idx].as_mode : mbmi->mode;
+    so = &intra_scan_orders[tx_size][mode];
   }
+  *scan = so->scan;
+  *scan_nb = so->neighbors;
 }
 
 #endif  // VP9_COMMON_VP9_ENTROPY_H_

vp9/decoder/vp9_detokenize.c

@@ -111,22 +111,11 @@ static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd,
   const uint8_t *cat6;
   const uint8_t *band_translate = get_band_translate(tx_size);
   const int dq_shift = (tx_size == TX_32X32);
-  const MODE_INFO *const mi = xd->mi_8x8[0];
-  const MB_MODE_INFO *const mbmi = &mi->mbmi;
-  scan_order const *so;
   int v;
   int16_t dqv = dq[0];
 
-  if (mbmi->ref_frame[0] > 0 || type != PLANE_TYPE_Y_WITH_DC || xd->lossless) {
-    so = &inter_scan_orders[tx_size];
-  } else {
-    MB_PREDICTION_MODE mode = mbmi->mode;
-    if (mbmi->sb_type < BLOCK_8X8)
-      mode = mi->bmi[block_idx].as_mode;
-    so = &intra_scan_orders[tx_size][mode];
-  }
-  scan = so->scan;
-  nb = so->neighbors;
+  get_scan(xd, tx_size, type, block_idx, &scan, &nb);
+
   while (c < seg_eob) {
     int val;
     if (c)