Unify resize and superres denominator constants

RESIZE_SCALE_DENOMINATOR and SUPERRES_SCALE_DENOMINATOR were two
constants with the same value that did essentially the same thing.

This patch merges the two into SCALE_DENOMINATOR for simplicity's sake.

Change-Id: I252a9b7f89f10d77bdb0c3cf2d67d31d337afa4b
diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index 6526174..bf18271 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -256,12 +256,12 @@
   }
 
   RANGE_CHECK_HI(cfg, rc_resize_mode, RESIZE_DYNAMIC);
-  RANGE_CHECK(cfg, rc_resize_numerator, RESIZE_SCALE_DENOMINATOR / 2,
-              RESIZE_SCALE_DENOMINATOR);
+  RANGE_CHECK(cfg, rc_resize_numerator, SCALE_DENOMINATOR / 2,
+              SCALE_DENOMINATOR);
 #if CONFIG_FRAME_SUPERRES
   RANGE_CHECK_HI(cfg, rc_superres_mode, SUPERRES_DYNAMIC);
-  RANGE_CHECK(cfg, rc_superres_numerator, SUPERRES_SCALE_DENOMINATOR / 2,
-              SUPERRES_SCALE_DENOMINATOR);
+  RANGE_CHECK(cfg, rc_superres_numerator, SCALE_DENOMINATOR / 2,
+              SCALE_DENOMINATOR);
 #endif  // CONFIG_FRAME_SUPERRES
 
   // AV1 does not support a lower bound on the keyframe interval in
@@ -491,14 +491,14 @@
   oxcf->resize_mode = (RESIZE_MODE)cfg->rc_resize_mode;
   oxcf->resize_scale_numerator = (uint8_t)cfg->rc_resize_numerator;
   if (oxcf->resize_mode == RESIZE_FIXED &&
-      oxcf->resize_scale_numerator == RESIZE_SCALE_DENOMINATOR)
+      oxcf->resize_scale_numerator == SCALE_DENOMINATOR)
     oxcf->resize_mode = RESIZE_NONE;
 
 #if CONFIG_FRAME_SUPERRES
   oxcf->superres_mode = (SUPERRES_MODE)cfg->rc_superres_mode;
   oxcf->superres_scale_numerator = (uint8_t)cfg->rc_superres_numerator;
   if (oxcf->superres_mode == SUPERRES_FIXED &&
-      oxcf->superres_scale_numerator == SUPERRES_SCALE_DENOMINATOR)
+      oxcf->superres_scale_numerator == SCALE_DENOMINATOR)
     oxcf->superres_mode = SUPERRES_NONE;
 #endif  // CONFIG_FRAME_SUPERRES
 
@@ -1583,12 +1583,12 @@
 
         25,  // g_lag_in_frames
 
-        0,                         // rc_dropframe_thresh
-        RESIZE_NONE,               // rc_resize_mode
-        RESIZE_SCALE_DENOMINATOR,  // rc_resize_numerator
+        0,                  // rc_dropframe_thresh
+        RESIZE_NONE,        // rc_resize_mode
+        SCALE_DENOMINATOR,  // rc_resize_numerator
 
-        0,                           // rc_superres_mode
-        SUPERRES_SCALE_DENOMINATOR,  // rc_superres_numerator
+        0,                  // rc_superres_mode
+        SCALE_DENOMINATOR,  // rc_superres_numerator
 
         AOM_VBR,      // rc_end_usage
         { NULL, 0 },  // rc_twopass_stats_in
diff --git a/av1/common/enums.h b/av1/common/enums.h
index 930b365..2e802de 100644
--- a/av1/common/enums.h
+++ b/av1/common/enums.h
@@ -546,8 +546,7 @@
 } RestorationType;
 #endif  // CONFIG_LOOP_RESTORATION
 
-#define RESIZE_SCALE_DENOMINATOR 16
-#define SUPERRES_SCALE_DENOMINATOR 16
+#define SCALE_DENOMINATOR 16
 
 #if CONFIG_FRAME_SUPERRES
 #define SUPERRES_SCALE_BITS 3
diff --git a/av1/common/reconinter.c b/av1/common/reconinter.c
index 8ca06c0..0265861 100644
--- a/av1/common/reconinter.c
+++ b/av1/common/reconinter.c
@@ -1041,7 +1041,7 @@
             pre = pre_buf->buf + y * pre_buf->stride + x;
             scaled_mv.row = mv_q4.row;
             scaled_mv.col = mv_q4.col;
-            xs = ys = 16;
+            xs = ys = SCALE_DENOMINATOR;
           }
 
           subpel_x = scaled_mv.col & SUBPEL_MASK;
@@ -1146,8 +1146,8 @@
         pre[ref] = pre_buf->buf + (y * pre_buf->stride + x);
         scaled_mv[ref].row = mv_q4.row;
         scaled_mv[ref].col = mv_q4.col;
-        subpel_params[ref].xs = 16;
-        subpel_params[ref].ys = 16;
+        subpel_params[ref].xs = SCALE_DENOMINATOR;
+        subpel_params[ref].ys = SCALE_DENOMINATOR;
       }
 
       subpel_params[ref].subpel_x = scaled_mv[ref].col & SUBPEL_MASK;
@@ -2983,7 +2983,7 @@
     pre = pre_buf->buf + (y * pre_buf->stride + x);
     scaled_mv.row = mv_q4.row;
     scaled_mv.col = mv_q4.col;
-    xs = ys = 16;
+    xs = ys = SCALE_DENOMINATOR;
   }
 
   subpel_x = scaled_mv.col & SUBPEL_MASK;
diff --git a/av1/common/resize.c b/av1/common/resize.c
index 3625263..027bd21 100644
--- a/av1/common/resize.c
+++ b/av1/common/resize.c
@@ -882,9 +882,9 @@
   }
 }
 
-void av1_calculate_scaled_size(int *width, int *height, int num, int den) {
-  *width = *width * num / den;
-  *height = *height * num / den;
+void av1_calculate_scaled_size(int *width, int *height, int num) {
+  *width = *width * num / SCALE_DENOMINATOR;
+  *height = *height * num / SCALE_DENOMINATOR;
 }
 
 #if CONFIG_FRAME_SUPERRES
diff --git a/av1/common/resize.h b/av1/common/resize.h
index 26c5955..ca2c046 100644
--- a/av1/common/resize.h
+++ b/av1/common/resize.h
@@ -79,13 +79,14 @@
                                           YV12_BUFFER_CONFIG *unscaled,
                                           YV12_BUFFER_CONFIG *scaled);
 
-void av1_calculate_scaled_size(int *width, int *height, int num, int den);
+void av1_calculate_scaled_size(int *width, int *height, int num);
+
 #if CONFIG_FRAME_SUPERRES
 void av1_superres_upscale(AV1_COMMON *cm, BufferPool *const pool);
 
 // Returns 1 if a superres upscaled frame is unscaled and 0 otherwise.
 static INLINE int av1_superres_unscaled(const AV1_COMMON *cm) {
-  return (cm->superres_scale_numerator == SUPERRES_SCALE_DENOMINATOR);
+  return (cm->superres_scale_numerator == SCALE_DENOMINATOR);
 }
 #endif  // CONFIG_FRAME_SUPERRES
 
diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index fa8c44c..60847ff 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -3087,11 +3087,10 @@
     cm->superres_scale_numerator += SUPERRES_SCALE_NUMERATOR_MIN;
     // Don't edit cm->width or cm->height directly, or the buffers won't get
     // resized correctly
-    av1_calculate_scaled_size(width, height, cm->superres_scale_numerator,
-                              SUPERRES_SCALE_DENOMINATOR);
+    av1_calculate_scaled_size(width, height, cm->superres_scale_numerator);
   } else {
     // 1:1 scaling - ie. no scaling, scale not provided
-    cm->superres_scale_numerator = SUPERRES_SCALE_DENOMINATOR;
+    cm->superres_scale_numerator = SCALE_DENOMINATOR;
   }
 }
 #endif  // CONFIG_FRAME_SUPERRES
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 45247f2..99fc32a 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -4348,7 +4348,7 @@
 static void write_superres_scale(const AV1_COMMON *const cm,
                                  struct aom_write_bit_buffer *wb) {
   // First bit is whether to to scale or not
-  if (cm->superres_scale_numerator == SUPERRES_SCALE_DENOMINATOR) {
+  if (cm->superres_scale_numerator == SCALE_DENOMINATOR) {
     aom_wb_write_bit(wb, 0);  // no scaling
   } else {
     aom_wb_write_bit(wb, 1);  // scaling, write scale factor
diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index a4473f8..9655823 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -2458,7 +2458,7 @@
 
   av1_loop_filter_init(cm);
 #if CONFIG_FRAME_SUPERRES
-  cm->superres_scale_numerator = SUPERRES_SCALE_DENOMINATOR;
+  cm->superres_scale_numerator = SCALE_DENOMINATOR;
   cm->superres_upscaled_width = oxcf->width;
   cm->superres_upscaled_height = oxcf->height;
 #endif  // CONFIG_FRAME_SUPERRES
@@ -3849,8 +3849,7 @@
   int encode_height = cpi->oxcf.height;
 
   uint8_t resize_num = av1_calculate_next_resize_scale(cpi);
-  av1_calculate_scaled_size(&encode_width, &encode_height, resize_num,
-                            RESIZE_SCALE_DENOMINATOR);
+  av1_calculate_scaled_size(&encode_width, &encode_height, resize_num);
 
 #if CONFIG_FRAME_SUPERRES
   AV1_COMMON *cm = &cpi->common;
@@ -3859,8 +3858,7 @@
   cm->superres_scale_numerator =
       av1_calculate_next_superres_scale(cpi, encode_width, encode_width);
   av1_calculate_scaled_size(&encode_width, &encode_height,
-                            cm->superres_scale_numerator,
-                            SUPERRES_SCALE_DENOMINATOR);
+                            cm->superres_scale_numerator);
 #endif  // CONFIG_FRAME_SUPERRES
 
   set_frame_size(cpi, encode_width, encode_height);
diff --git a/av1/encoder/ratectrl.c b/av1/encoder/ratectrl.c
index 9cbf1fe..7c1b972 100644
--- a/av1/encoder/ratectrl.c
+++ b/av1/encoder/ratectrl.c
@@ -1672,11 +1672,11 @@
 uint8_t av1_calculate_next_resize_scale(const AV1_COMP *cpi) {
   static unsigned int seed = 56789;
   const AV1EncoderConfig *oxcf = &cpi->oxcf;
-  if (oxcf->pass == 1) return RESIZE_SCALE_DENOMINATOR;
-  uint8_t new_num = RESIZE_SCALE_DENOMINATOR;
+  if (oxcf->pass == 1) return SCALE_DENOMINATOR;
+  uint8_t new_num = SCALE_DENOMINATOR;
 
   switch (oxcf->resize_mode) {
-    case RESIZE_NONE: new_num = RESIZE_SCALE_DENOMINATOR; break;
+    case RESIZE_NONE: new_num = SCALE_DENOMINATOR; break;
     case RESIZE_FIXED: new_num = oxcf->resize_scale_numerator; break;
     case RESIZE_DYNAMIC:
       // RESIZE_DYNAMIC: Just random for now.
@@ -1693,11 +1693,11 @@
                                           int height) {
   static unsigned int seed = 34567;
   const AV1EncoderConfig *oxcf = &cpi->oxcf;
-  if (oxcf->pass == 1) return SUPERRES_SCALE_DENOMINATOR;
-  uint8_t new_num = SUPERRES_SCALE_DENOMINATOR;
+  if (oxcf->pass == 1) return SCALE_DENOMINATOR;
+  uint8_t new_num = SCALE_DENOMINATOR;
 
   switch (oxcf->superres_mode) {
-    case SUPERRES_NONE: new_num = SUPERRES_SCALE_DENOMINATOR; break;
+    case SUPERRES_NONE: new_num = SCALE_DENOMINATOR; break;
     case SUPERRES_FIXED: new_num = oxcf->superres_scale_numerator; break;
     case SUPERRES_DYNAMIC:
       // SUPERRES_DYNAMIC: Just random for now.
@@ -1707,9 +1707,9 @@
   }
 
   // Make sure overall reduction is no more than 1/2 of the source size.
-  if (new_num * width / SUPERRES_SCALE_DENOMINATOR * 2 < oxcf->width ||
-      new_num * height / SUPERRES_SCALE_DENOMINATOR * 2 < oxcf->height)
-    new_num = SUPERRES_SCALE_DENOMINATOR;
+  if (new_num * width / SCALE_DENOMINATOR * 2 < oxcf->width ||
+      new_num * height / SCALE_DENOMINATOR * 2 < oxcf->height)
+    new_num = SCALE_DENOMINATOR;
 
   return new_num;
 }