Adding TREE_SIZE macro + cleanup.

Using TREE_SIZE for the following trees:
  vp9_intra_mode_tree
  vp9_inter_mode_tree
  vp9_partition_tree
  vp9_switchable_interp_tree
  vp9_mv_joint_tree
  vp9_mv_class_tree
  vp9_mv_class0_tree
  vp9_mv_fp_tree

Change-Id: I0212bb4c1ee6648249f68517e28a67a56591ee1b

vp9/common/vp9_entropymode.c

@@ -226,7 +226,7 @@ static const vp9_prob default_inter_mode_probs[INTER_MODE_CONTEXTS]
 };
 
 /* Array indices are identical to previously-existing INTRAMODECONTEXTNODES. */
-const vp9_tree_index vp9_intra_mode_tree[INTRA_MODES * 2 - 2] = {
+const vp9_tree_index vp9_intra_mode_tree[TREE_SIZE(INTRA_MODES)] = {
   -DC_PRED, 2,                      /* 0 = DC_NODE */
   -TM_PRED, 4,                      /* 1 = TM_NODE */
   -V_PRED, 6,                       /* 2 = V_NODE */
@@ -237,22 +237,20 @@ const vp9_tree_index vp9_intra_mode_tree[INTRA_MODES * 2 - 2] = {
   -D63_PRED, 16,                    /* 7 = D63_NODE */
   -D153_PRED, -D207_PRED             /* 8 = D153_NODE */
 };
+struct vp9_token vp9_intra_mode_encodings[INTRA_MODES];
 
-const vp9_tree_index vp9_inter_mode_tree[6] = {
+const vp9_tree_index vp9_inter_mode_tree[TREE_SIZE(INTER_MODES)] = {
   -ZEROMV, 2,
   -NEARESTMV, 4,
   -NEARMV, -NEWMV
 };
+struct vp9_token vp9_inter_mode_encodings[INTER_MODES];
 
-const vp9_tree_index vp9_partition_tree[6] = {
+const vp9_tree_index vp9_partition_tree[TREE_SIZE(PARTITION_TYPES)] = {
   -PARTITION_NONE, 2,
   -PARTITION_HORZ, 4,
   -PARTITION_VERT, -PARTITION_SPLIT
 };
-
-struct vp9_token vp9_intra_mode_encodings[INTRA_MODES];
-struct vp9_token vp9_inter_mode_encodings[INTER_MODES];
-
 struct vp9_token vp9_partition_encodings[PARTITION_TYPES];
 
 static const vp9_prob default_intra_inter_p[INTRA_INTER_CONTEXTS] = {
@@ -338,7 +336,8 @@ void vp9_init_mbmode_probs(VP9_COMMON *cm) {
   vp9_copy(cm->fc.mbskip_probs, default_mbskip_probs);
 }
 
-const vp9_tree_index vp9_switchable_interp_tree[SWITCHABLE_FILTERS*2-2] = {
+const vp9_tree_index vp9_switchable_interp_tree
+                         [TREE_SIZE(SWITCHABLE_FILTERS)] = {
   -EIGHTTAP, 2,
   -EIGHTTAP_SMOOTH, -EIGHTTAP_SHARP
 };

vp9/common/vp9_entropymode.h

@@ -37,19 +37,17 @@ extern const vp9_prob vp9_kf_uv_mode_prob[INTRA_MODES][INTRA_MODES - 1];
 extern const vp9_prob vp9_kf_y_mode_prob[INTRA_MODES][INTRA_MODES]
                                         [INTRA_MODES - 1];
 
-extern const vp9_tree_index vp9_intra_mode_tree[];
-extern const vp9_tree_index vp9_inter_mode_tree[];
-
+extern const vp9_tree_index vp9_intra_mode_tree[TREE_SIZE(INTRA_MODES)];
 extern struct vp9_token vp9_intra_mode_encodings[INTRA_MODES];
+
+extern const vp9_tree_index vp9_inter_mode_tree[TREE_SIZE(INTER_MODES)];
 extern struct vp9_token vp9_inter_mode_encodings[INTER_MODES];
 
-// probability models for partition information
-extern const vp9_tree_index vp9_partition_tree[];
+extern const vp9_tree_index vp9_partition_tree[TREE_SIZE(PARTITION_TYPES)];
 extern struct vp9_token vp9_partition_encodings[PARTITION_TYPES];
 
 extern const vp9_tree_index vp9_switchable_interp_tree
-                 [2 * (SWITCHABLE_FILTERS - 1)];
-
+                                [TREE_SIZE(SWITCHABLE_FILTERS)];
 extern struct vp9_token vp9_switchable_interp_encodings[SWITCHABLE_FILTERS];
 
 void vp9_entropy_mode_init();

vp9/common/vp9_entropymv.c

@@ -18,14 +18,14 @@
 /* Integer pel reference mv threshold for use of high-precision 1/8 mv */
 #define COMPANDED_MVREF_THRESH 8
 
-const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2] = {
+const vp9_tree_index vp9_mv_joint_tree[TREE_SIZE(MV_JOINTS)] = {
   -MV_JOINT_ZERO, 2,
   -MV_JOINT_HNZVZ, 4,
   -MV_JOINT_HZVNZ, -MV_JOINT_HNZVNZ
 };
 struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
 
-const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2] = {
+const vp9_tree_index vp9_mv_class_tree[TREE_SIZE(MV_CLASSES)] = {
   -MV_CLASS_0, 2,
   -MV_CLASS_1, 4,
   6, 8,
@@ -39,12 +39,12 @@ const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2] = {
 };
 struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
 
-const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2] = {
+const vp9_tree_index vp9_mv_class0_tree[TREE_SIZE(CLASS0_SIZE)] = {
   -0, -1,
 };
 struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];
 
-const vp9_tree_index vp9_mv_fp_tree[2 * 4 - 2] = {
+const vp9_tree_index vp9_mv_fp_tree[TREE_SIZE(4)] = {
   -0, 2,
   -1, 4,
   -2, -3

vp9/common/vp9_entropymv.h

@@ -43,9 +43,6 @@ static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
   return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
 }
 
-extern const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2];
-extern struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
-
 /* Symbols for coding magnitude class of nonzero components */
 #define MV_CLASSES     11
 typedef enum {
@@ -62,9 +59,6 @@ typedef enum {
   MV_CLASS_10 = 10,    /* (1024,2048] integer pel */
 } MV_CLASS_TYPE;
 
-extern const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2];
-extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
-
 #define CLASS0_BITS    1  /* bits at integer precision for class 0 */
 #define CLASS0_SIZE    (1 << CLASS0_BITS)
 #define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
@@ -77,10 +71,16 @@ extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
 #define MV_UPP   ((1 << MV_IN_USE_BITS) - 1)
 #define MV_LOW   (-(1 << MV_IN_USE_BITS))
 
-extern const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2];
+extern const vp9_tree_index vp9_mv_joint_tree[TREE_SIZE(MV_JOINTS)];
+extern struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
+
+extern const vp9_tree_index vp9_mv_class_tree[TREE_SIZE(MV_CLASSES)];
+extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
+
+extern const vp9_tree_index vp9_mv_class0_tree[TREE_SIZE(CLASS0_SIZE)];
 extern struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];
 
-extern const vp9_tree_index vp9_mv_fp_tree[2 * 4 - 2];
+extern const vp9_tree_index vp9_mv_fp_tree[TREE_SIZE(4)];
 extern struct vp9_token vp9_mv_fp_encodings[4];
 
 typedef struct {

vp9/common/vp9_treecoder.h

@@ -21,6 +21,8 @@ typedef uint8_t vp9_prob;
 
 typedef int8_t vp9_tree_index;
 
+#define TREE_SIZE(leaf_count) (2 * (leaf_count) - 2)
+
 #define vp9_complement(x) (255 - x)
 
 /* We build coding trees compactly in arrays.