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[UT] Test generic downsampling routines with a wider variety of width ratios

Get coverage of all code paths for routines that branch to different
paths for different scaling ratios.

--- a/test/processing/ProcessUT_DownSample.cpp

+++ b/test/processing/ProcessUT_DownSample.cpp

@@ -296,21 +296,23 @@

   int src_stride_a; \

   int src_width_a; \

   int src_height_a; \

-  dst_stride_c = dst_stride_a = 320; \

-  src_stride_c = src_stride_a = 320; \

-  src_width_c = src_width_a = 320; \

-  src_height_c = src_height_a = 180; \

-  dst_width_c = dst_width_a = 300; \

-  dst_height_c = dst_height_a = 160; \

-  for (int j = 0; j < 70000; j++) { \

-    dst_c[j] = dst_a[j] = rand() % 256; \

-    src_c[j] = src_a[j] = rand() % 256; \

-  } \

-  ref (dst_c, dst_stride_c, dst_width_c, dst_height_c, src_c, src_stride_c, src_width_c, src_height_c); \

-  func (dst_a, dst_stride_a, dst_width_a, dst_height_a, src_a, src_stride_a, src_width_a, src_height_a); \

-  for (int j = 0; j < dst_height_c; j++) { \

-    for (int m = 0; m < dst_width_c ; m++) { \

-      ASSERT_EQ (dst_c[m + j * dst_stride_c], dst_a[m + j * dst_stride_a]); \

+  for (int i = 0; i < 5; i++) { \

+    dst_stride_c = dst_stride_a = 320; \

+    src_stride_c = src_stride_a = 320; \

+    src_width_c = src_width_a = 320; \

+    src_height_c = src_height_a = 180; \

+    dst_width_c = dst_width_a = (src_width_c >> (i + 1)) + rand() % (src_width_c >> (i + 1)); \

+    dst_height_c = dst_height_a = 160; \

+    for (int j = 0; j < 70000; j++) { \

+      dst_c[j] = dst_a[j] = rand() % 256; \

+      src_c[j] = src_a[j] = rand() % 256; \

+    } \

+    ref (dst_c, dst_stride_c, dst_width_c, dst_height_c, src_c, src_stride_c, src_width_c, src_height_c); \

+    func (dst_a, dst_stride_a, dst_width_a, dst_height_a, src_a, src_stride_a, src_width_a, src_height_a); \

+    for (int j = 0; j < dst_height_c; j++) { \

+      for (int m = 0; m < dst_width_c ; m++) { \

+        ASSERT_EQ (dst_c[m + j * dst_stride_c], dst_a[m + j * dst_stride_a]); \

+      } \

     } \

   } \

 }