Separate setup_scale_factor/extend_frame_borders

This commit takes out vp9_extend_frame_borders from
vp9_setup_scale_factors.

The refactoring is for the preparation of the use of lazy border
extension at decoder. This makes it necessary to handle border
extension separately at encoder/decoder. The use of
vp9_extend_frame_borders will be removed, when lazy border extension
is ready.

Change-Id: Ia3baba3d179d5f11eee1634f19b3b319d2a59186

vp9/common/vp9_reconinter.c

@@ -218,9 +218,6 @@ void vp9_setup_scale_factors(VP9_COMMON *cm, int i) {
     vp9_setup_scale_factors_for_frame(sf, sfc,
                                       fb->y_crop_width, fb->y_crop_height,
                                       cm->width, cm->height);
-
-    if (vp9_is_scaled(sfc))
-      vp9_extend_frame_borders(fb, cm->subsampling_x, cm->subsampling_y);
   }
 }
 

vp9/decoder/vp9_decodeframe.c

@@ -11,6 +11,8 @@
 #include <assert.h>
 
 #include "./vp9_rtcd.h"
+#include "./vpx_scale_rtcd.h"
+
 #include "vpx_mem/vpx_mem.h"
 #include "vpx_scale/vpx_scale.h"
 
@@ -1154,8 +1156,12 @@ static size_t read_uncompressed_header(VP9D_COMP *pbi,
       cm->allow_high_precision_mv = vp9_rb_read_bit(rb);
       cm->mcomp_filter_type = read_interp_filter_type(rb);
 
-      for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i)
+      for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i) {
         vp9_setup_scale_factors(cm, i);
+        if (vp9_is_scaled(&cm->active_ref_scale_comm[i]))
+          vp9_extend_frame_borders(&cm->yv12_fb[cm->active_ref_idx[i]],
+                                   cm->subsampling_x, cm->subsampling_y);
+      }
     }
   }
 

vp9/encoder/vp9_onyx_if.c

@@ -3968,8 +3968,12 @@ int vp9_get_compressed_data(VP9_PTR ptr, unsigned int *frame_flags,
                            VP9BORDERINPIXELS);
 
   // Calculate scaling factors for each of the 3 available references
-  for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i)
+  for (i = 0; i < ALLOWED_REFS_PER_FRAME; ++i) {
     vp9_setup_scale_factors(cm, i);
+    if (vp9_is_scaled(&cm->active_ref_scale_comm[i]))
+      vp9_extend_frame_borders(&cm->yv12_fb[cm->active_ref_idx[i]],
+                               cm->subsampling_x, cm->subsampling_y);
+  }
 
   vp9_setup_interp_filters(&cpi->mb.e_mbd, DEFAULT_INTERP_FILTER, cm);