IVGCVSW-6469 Add MirrorPad FrontEnd and Ref Support

 * Added PaddingMode enum to PaddingDescriptor to enable Symmetric and
   Reflect padding.
 * Added Symmetric and Reflect Ref implementation.
 * Added Serializer & Deserializer support.
 * Added unit tests.

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I4bed907b31742b32ccefe5e8ca39a6f1e5bd9dee

3 files changed, 16 insertions, 5 deletions

diff --git a/src/backends/aclCommon/ArmComputeTensorUtils.cpp b/src/backends/aclCommon/ArmComputeTensorUtils.cpp
index 62f3263a0c..8bbaea71b3 100644
--- a/src/backends/aclCommon/ArmComputeTensorUtils.cpp
+++ b/src/backends/aclCommon/ArmComputeTensorUtils.cpp
@@ -254,9 +254,9 @@ arm_compute::Size2D BuildArmComputeSize2D(const unsigned int width, const unsign
     return arm_compute::Size2D(width, height);
 }
 
-arm_compute::PixelValue GetPixelValue(arm_compute::ITensor& input, float pixelValue)
+arm_compute::PixelValue GetPixelValue(const arm_compute::ITensorInfo* tensorInfo, float pixelValue)
 {
-    switch (input.info()->data_type())
+    switch (tensorInfo->data_type())
     {
         case arm_compute::DataType::F16:
             return arm_compute::PixelValue(static_cast<Half>(pixelValue));
@@ -273,7 +273,7 @@ arm_compute::PixelValue GetPixelValue(arm_compute::ITensor& input, float pixelVa
             return arm_compute::PixelValue(static_cast<int32_t>(pixelValue));
         default:
             throw InvalidArgumentException("Unsupported DataType: [" +
-                                           std::to_string(static_cast<int>(input.info()->data_type())) + "]");
+                                           std::to_string(static_cast<int>(tensorInfo->data_type())) + "]");
     }
 }
 
diff --git a/src/backends/aclCommon/ArmComputeTensorUtils.hpp b/src/backends/aclCommon/ArmComputeTensorUtils.hpp
index ad5d4614fe..30df31b79d 100644
--- a/src/backends/aclCommon/ArmComputeTensorUtils.hpp
+++ b/src/backends/aclCommon/ArmComputeTensorUtils.hpp
@@ -65,8 +65,8 @@ arm_compute::PermutationVector BuildArmComputeTransposeVector(const armnn::Permu
 /// Utility function used to setup an arm_compute::Size2D object from width and height values.
 arm_compute::Size2D BuildArmComputeSize2D(const unsigned int width, const unsigned int height);
 
-/// Gets the appropriate PixelValue for the input DataType
-arm_compute::PixelValue GetPixelValue(arm_compute::ITensor& input, float pixelValue);
+/// Gets the appropriate PixelValue for the TensorInfo DataType
+arm_compute::PixelValue GetPixelValue(const arm_compute::ITensorInfo* tensorInfo, float pixelValue);
 
 /// Utility function used to setup an arm_compute::PadStrideInfo object from an armnn layer descriptor.
 template <typename Descriptor>
diff --git a/src/backends/aclCommon/ArmComputeUtils.hpp b/src/backends/aclCommon/ArmComputeUtils.hpp
index 2f767891a1..f096346c38 100644
--- a/src/backends/aclCommon/ArmComputeUtils.hpp
+++ b/src/backends/aclCommon/ArmComputeUtils.hpp
@@ -300,6 +300,17 @@ inline arm_compute::Conv3dInfo ComputeConv3DInfo(const armnn::Convolution3dQueue
     return arm_compute::Conv3dInfo{stride, padding, activationInfo, dilation, roundType, isFastMathEnabled};
 }
 
+inline arm_compute::PaddingMode ConvertPaddingModeToAcl(const PaddingMode& paddingMode)
+{
+    switch (paddingMode)
+    {
+        case PaddingMode::Constant:   return arm_compute::PaddingMode::CONSTANT;
+        case PaddingMode::Reflect:    return arm_compute::PaddingMode::REFLECT;
+        case PaddingMode::Symmetric:  return arm_compute::PaddingMode::SYMMETRIC;
+        default:                      throw InvalidArgumentException("Unsupported Padding Mode");
+    }
+}
+
 inline arm_compute::ReductionOperation ConvertReductionOperationToAcl(const ReduceDescriptor& descriptor)
 {
     switch (descriptor.m_ReduceOperation)