Port Arm(R) Neon(TM) Scale to new API

Partially resolves: COMPMID-4190

Change-Id: I0c1e32ff6176775c9b7bf547899a791fd318ba0a
Signed-off-by: Manuel Bottini <manuel.bottini@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5192
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: TeresaARM <teresa.charlinreyes@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-by: Sheri Zhang <sheri.zhang@arm.com>
diff --git a/src/runtime/NEON/functions/NEScale.cpp b/src/runtime/NEON/functions/NEScale.cpp
index f91de32..0fbad07 100644
--- a/src/runtime/NEON/functions/NEScale.cpp
+++ b/src/runtime/NEON/functions/NEScale.cpp
@@ -23,191 +23,99 @@
  */
 #include "arm_compute/runtime/NEON/functions/NEScale.h"
 
-#include "arm_compute/core/Coordinates.h"
-#include "arm_compute/core/Error.h"
-#include "arm_compute/core/Helpers.h"
-#include "arm_compute/core/ITensor.h"
-#include "arm_compute/core/PixelValue.h"
-#include "arm_compute/core/TensorInfo.h"
-#include "arm_compute/core/Window.h"
-#include "arm_compute/runtime/NEON/NEScheduler.h"
-#include "arm_compute/runtime/TensorAllocator.h"
-#include "src/core/NEON/kernels/NEScaleKernel.h"
-
+#include "arm_compute/core/Validate.h"
+#include "arm_compute/runtime/Tensor.h"
 #include "src/core/utils/ScaleUtils.h"
-
+#include "src/runtime/cpu/operators/CpuScale.h"
 #include "support/Rounding.h"
 
-#include <cmath>
-#include <cstddef>
-#include <utility>
-
 namespace arm_compute
 {
-namespace
+struct NEScale::Impl
 {
-void precompute_dx_dy_offsets(ITensor *dx, ITensor *dy, ITensor *offsets, float wr, float hr, SamplingPolicy sampling_policy, bool align_corners)
-{
-    ARM_COMPUTE_ERROR_ON(nullptr == offsets);
-    ARM_COMPUTE_UNUSED(sampling_policy);
-    float sampling_offset = 0.0f;
-    if(sampling_policy == SamplingPolicy::CENTER)
-    {
-        sampling_offset = 0.5f;
-    }
-
-    Window win;
-    win.set(Window::DimX, Window::Dimension(0, offsets->info()->dimension(0), 1));
-    win.set(Window::DimY, Window::Dimension(0, offsets->info()->dimension(1), 1));
-
-    if(dx != nullptr && dy != nullptr)
-    {
-        // Pre-compute the offset and pixel's distance for BILINEAR interpolation
-        Iterator offsets_it(offsets, win);
-        Iterator dx_it(dx, win);
-        Iterator dy_it(dy, win);
-
-        execute_window_loop(win, [&](const Coordinates & id)
-        {
-            const float in_x  = (id.x() + sampling_offset) * wr - sampling_offset;
-            const float in_y  = (id.y() + sampling_offset) * hr - sampling_offset;
-            const int   in_xi = std::floor(in_x);
-            const int   in_yi = std::floor(in_y);
-
-            *reinterpret_cast<int32_t *>(offsets_it.ptr()) = in_xi;
-            *reinterpret_cast<float *>(dx_it.ptr())        = in_x - in_xi;
-            *reinterpret_cast<float *>(dy_it.ptr())        = in_y - in_yi;
-        },
-        offsets_it, dx_it, dy_it);
-    }
-    else
-    {
-        // Pre-compute the offset for NEAREST interpolation
-        Iterator offsets_it(offsets, win);
-
-        execute_window_loop(win, [&](const Coordinates & id)
-        {
-            const float float_in_xi                        = (id.x() + sampling_offset) * wr;
-            const auto  in_xi                              = static_cast<size_t>(align_corners ? arm_compute::utils::rounding::round_half_away_from_zero(float_in_xi) : std::floor(float_in_xi));
-            *reinterpret_cast<int32_t *>(offsets_it.ptr()) = in_xi;
-        },
-        offsets_it);
-    }
-}
-} // namespace
+    const ITensor                 *src{ nullptr };
+    ITensor                       *dst{ nullptr };
+    Tensor                         dx{ nullptr };      /**< Element's distance between the X real coordinate and the smallest X following integer */
+    Tensor                         dy{ nullptr };      /**< Element's distance between the Y real coordinate and the smallest Y following integer */
+    Tensor                         offsets{ nullptr }; /**< Offset to access the element with NEAREST interpolation or the top-left element with BILINEAR interpolation in the input tensor */
+    std::unique_ptr<cpu::CpuScale> op{ nullptr };
+};
 
 NEScale::NEScale()
-    : _offsets(), _dx(), _dy()
+    : _impl(std::make_unique<Impl>())
 {
 }
+NEScale::~NEScale() = default;
 
 void NEScale::configure(ITensor *input, ITensor *output, const ScaleKernelInfo &info)
 {
-    ARM_COMPUTE_ERROR_ON_NULLPTR(input, output);
-    ARM_COMPUTE_ERROR_THROW_ON(NEScale::validate(input->info(), output->info(), info));
+    _impl->src = input;
+    _impl->dst = output;
+    _impl->op  = std::make_unique<cpu::CpuScale>();
+    _impl->op->configure(input->info(), output->info(), info);
 
-    const bool is_align_corners_used = info.align_corners && arm_compute::scale_utils::is_align_corners_allowed_sampling_policy(info.sampling_policy);
-
+    // Configure for size of allocation of internal tensors
     // Get data layout and width/height indices
     const DataLayout data_layout = info.data_layout == DataLayout::UNKNOWN ? input->info()->data_layout() : info.data_layout;
     const int        idx_width   = get_data_layout_dimension_index(data_layout, DataLayoutDimension::WIDTH);
     const int        idx_height  = get_data_layout_dimension_index(data_layout, DataLayoutDimension::HEIGHT);
 
+    // Compute the ratio between source width/height and destination width/height
+    const bool is_align_corners_used = info.align_corners && arm_compute::scale_utils::is_align_corners_allowed_sampling_policy(info.sampling_policy);
+    const auto wr                    = arm_compute::scale_utils::calculate_resize_ratio(input->info()->dimension(idx_width), output->info()->dimension(idx_width), is_align_corners_used);
+    const auto hr                    = arm_compute::scale_utils::calculate_resize_ratio(input->info()->dimension(idx_height), output->info()->dimension(idx_height), is_align_corners_used);
+
+    // Area interpolation behaves as Nearest Neighbour in case of up-sampling
+    InterpolationPolicy policy_to_use = (info.interpolation_policy == InterpolationPolicy::AREA && wr <= 1.f && hr <= 1.f) ? InterpolationPolicy::NEAREST_NEIGHBOR : info.interpolation_policy;
+
     // Get the tensor shape
     TensorShape shape(output->info()->dimension(idx_width));
     shape.set(1, output->info()->dimension(idx_height), false);
 
-    // Compute the ratio between source width/height and destination width/height
-    const auto wr = arm_compute::scale_utils::calculate_resize_ratio(input->info()->dimension(idx_width), output->info()->dimension(idx_width), is_align_corners_used);
-    const auto hr = arm_compute::scale_utils::calculate_resize_ratio(input->info()->dimension(idx_height), output->info()->dimension(idx_height), is_align_corners_used);
+    const TensorInfo tensor_info_dxdy(shape, Format::F32);
+    const TensorInfo tensor_info_offsets(shape, Format::S32);
 
-    // Area interpolation behaves as Nearest Neighbour in case of up-sampling
-    const auto policy_to_use = (info.interpolation_policy == InterpolationPolicy::AREA && wr <= 1.f && hr <= 1.f) ? InterpolationPolicy::NEAREST_NEIGHBOR : info.interpolation_policy;
-
-    auto scale_kernel = std::make_unique<NEScaleKernel>();
+    _impl->dx.allocator()->init(tensor_info_dxdy);
+    _impl->dy.allocator()->init(tensor_info_dxdy);
+    _impl->offsets.allocator()->init(tensor_info_offsets);
     switch(policy_to_use)
     {
         case InterpolationPolicy::NEAREST_NEIGHBOR:
         {
-            TensorInfo tensor_info_offsets(shape, Format::S32);
-            _offsets.allocator()->init(tensor_info_offsets);
-
-            scale_kernel->configure(input, nullptr, nullptr, &_offsets, output, info);
-
             // Allocate once the configure methods have been called
-            _offsets.allocator()->allocate();
-
-            // Pre-compute offsets for nearest interpolation
-            precompute_dx_dy_offsets(nullptr, nullptr, &_offsets, wr, hr, info.sampling_policy, is_align_corners_used);
+            _impl->offsets.allocator()->allocate();
             break;
         }
         case InterpolationPolicy::BILINEAR:
         {
-            TensorInfo tensor_info_offsets(shape, Format::S32);
-            TensorInfo tensor_info_dxdy(shape, Format::F32);
-
-            _offsets.allocator()->init(tensor_info_offsets);
-            _dx.allocator()->init(tensor_info_dxdy);
-            _dy.allocator()->init(tensor_info_dxdy);
-
-            scale_kernel->configure(input, &_dx, &_dy, &_offsets, output, info);
-
             // Allocate once the configure methods have been called
-            _offsets.allocator()->allocate();
-            _dx.allocator()->allocate();
-            _dy.allocator()->allocate();
-
-            // Pre-compute dx, dy and offsets for bilinear interpolation
-            precompute_dx_dy_offsets(&_dx, &_dy, &_offsets, wr, hr, info.sampling_policy, is_align_corners_used);
+            _impl->dx.allocator()->allocate();
+            _impl->dy.allocator()->allocate();
+            _impl->offsets.allocator()->allocate();
             break;
         }
         case InterpolationPolicy::AREA:
         {
-            scale_kernel->configure(input, nullptr, nullptr, nullptr, output, info);
             break;
         }
         default:
             ARM_COMPUTE_ERROR("Unsupported interpolation mode");
     }
-    _kernel = std::move(scale_kernel);
 }
 
 Status NEScale::validate(const ITensorInfo *input, const ITensorInfo *output, const ScaleKernelInfo &info)
 {
-    ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(input, output);
-    ARM_COMPUTE_RETURN_ERROR_ON(info.sampling_policy != SamplingPolicy::CENTER && info.sampling_policy != SamplingPolicy::TOP_LEFT);
+    return cpu::CpuScale::validate(input, output, info);
+}
 
-    ITensorInfo *offsets = nullptr;
-    ITensorInfo *dx      = nullptr;
-    ITensorInfo *dy      = nullptr;
-
-    // Get data layout and width/height indices
-    const DataLayout data_layout = info.data_layout == DataLayout::UNKNOWN ? input->data_layout() : info.data_layout;
-    const int        idx_width   = get_data_layout_dimension_index(data_layout, DataLayoutDimension::WIDTH);
-    const int        idx_height  = get_data_layout_dimension_index(data_layout, DataLayoutDimension::HEIGHT);
-
-    // Get the tensor shape of auxilary buffers
-    const TensorShape shape(output->dimension(idx_width), output->dimension(idx_height));
-
-    TensorInfo tensor_info_offsets(shape, Format::S32);
-    TensorInfo tensor_info_dx(shape, Format::F32);
-    TensorInfo tensor_info_dy(shape, Format::F32);
-
-    switch(info.interpolation_policy)
-    {
-        case InterpolationPolicy::NEAREST_NEIGHBOR:
-            offsets = &tensor_info_offsets;
-            break;
-        case InterpolationPolicy::BILINEAR:
-            offsets = &tensor_info_offsets;
-            dx      = &tensor_info_dx;
-            dy      = &tensor_info_dy;
-            break;
-        default:
-            break;
-    }
-
-    ARM_COMPUTE_RETURN_ON_ERROR(NEScaleKernel::validate(input->clone().get(), dx, dy, offsets, output->clone().get(), info));
-    return Status{};
+void NEScale::run()
+{
+    ITensorPack pack;
+    pack.add_tensor(TensorType::ACL_SRC, _impl->src);
+    pack.add_tensor(TensorType::ACL_DST, _impl->dst);
+    pack.add_tensor(TensorType::ACL_INT_0, &_impl->dx);
+    pack.add_tensor(TensorType::ACL_INT_1, &_impl->dy);
+    pack.add_tensor(TensorType::ACL_INT_2, &_impl->offsets);
+    _impl->op->run(pack);
 }
 } // namespace arm_compute