COMPMID-424 Implemented reference implementation and tests for WarpAffine

Change-Id: I4924ab1de17adc3b880a5cc22f2497abbc8e221b
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/85820
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Steven Niu <steven.niu@arm.com>
diff --git a/src/core/CL/cl_kernels/warp_affine.cl b/src/core/CL/cl_kernels/warp_affine.cl
index 0a4748f..f41821c 100644
--- a/src/core/CL/cl_kernels/warp_affine.cl
+++ b/src/core/CL/cl_kernels/warp_affine.cl
@@ -84,7 +84,7 @@
 {
     Image in  = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in);
     Image out = CONVERT_TO_IMAGE_STRUCT(out);
-    vstore4(read_texels4(&in, convert_int8(clamp_to_border(apply_affine_transform(get_current_coords(), build_affine_mtx()), width, height))), 0, out.ptr);
+    vstore4(read_texels4(&in, convert_int8_rtn(clamp_to_border(apply_affine_transform(get_current_coords(), build_affine_mtx()), width, height))), 0, out.ptr);
 }
 
 /** Performs an affine transform on an image interpolating with the BILINEAR method. Input and output are single channel U8.
@@ -116,5 +116,5 @@
 {
     Image in  = CONVERT_TO_IMAGE_STRUCT_NO_STEP(in);
     Image out = CONVERT_TO_IMAGE_STRUCT(out);
-    vstore4(bilinear_interpolate(&in, clamp_to_border(apply_affine_transform(get_current_coords(), build_affine_mtx()), width, height), width, height), 0, out.ptr);
+    vstore4(bilinear_interpolate(&in, apply_affine_transform(get_current_coords(), build_affine_mtx()), width, height), 0, out.ptr);
 }