Rename defined constants

The change is to better reflect the nature of the constants.

Change-Id: Icabac6e9bceefbdb3f03f8218f88ef75943c30fb

vp9/common/vp9_idct.c

@@ -28,10 +28,10 @@ void vp9_short_iwalsh4x4_add_c(int16_t *input, uint8_t *dest, int dest_stride) {
   int16_t *op = output;
 
   for (i = 0; i < 4; i++) {
-    a1 = ip[0] >> WHT_UPSCALE_FACTOR;
+    a1 = ip[0] >> UNIT_QUANT_SHIFT;
-    c1 = ip[1] >> WHT_UPSCALE_FACTOR;
+    c1 = ip[1] >> UNIT_QUANT_SHIFT;
-    d1 = ip[2] >> WHT_UPSCALE_FACTOR;
+    d1 = ip[2] >> UNIT_QUANT_SHIFT;
-    b1 = ip[3] >> WHT_UPSCALE_FACTOR;
+    b1 = ip[3] >> UNIT_QUANT_SHIFT;
     a1 += c1;
     d1 -= b1;
     e1 = (a1 - d1) >> 1;
@@ -77,7 +77,7 @@ void vp9_short_iwalsh4x4_1_add_c(int16_t *in, uint8_t *dest, int dest_stride) {
   int16_t *ip = in;
   int16_t *op = tmp;
 
-  a1 = ip[0] >> WHT_UPSCALE_FACTOR;
+  a1 = ip[0] >> UNIT_QUANT_SHIFT;
   e1 = a1 >> 1;
   a1 -= e1;
   op[0] = a1;

vp9/common/vp9_idct.h

@@ -22,7 +22,8 @@
 #define DCT_CONST_BITS 14
 #define DCT_CONST_ROUNDING  (1 << (DCT_CONST_BITS - 1))
 
-#define WHT_UPSCALE_FACTOR 2
+#define UNIT_QUANT_SHIFT 2
+#define UNIT_QUANT_FACTOR (1 << UNIT_QUANT_SHIFT)
 
 #define pair_set_epi16(a, b) \
   _mm_set_epi16(b, a, b, a, b, a, b, a)

vp9/encoder/vp9_dct.c

@@ -637,10 +637,10 @@ void vp9_short_walsh4x4_c(short *input, short *output, int pitch) {
     c1 = e1 - c1;
     a1 -= c1;
     d1 += b1;
-    op[0] = a1 << WHT_UPSCALE_FACTOR;
+    op[0] = a1 * UNIT_QUANT_FACTOR;
-    op[1] = c1 << WHT_UPSCALE_FACTOR;
+    op[1] = c1 * UNIT_QUANT_FACTOR;
-    op[2] = d1 << WHT_UPSCALE_FACTOR;
+    op[2] = d1 * UNIT_QUANT_FACTOR;
-    op[3] = b1 << WHT_UPSCALE_FACTOR;
+    op[3] = b1 * UNIT_QUANT_FACTOR;
 
     ip += 4;
     op += 4;