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/tests/validation/CPP/WarpAffine.cpp b/tests/validation/CPP/WarpAffine.cpp
new file mode 100644
index 0000000..7b903b7
--- /dev/null
+++ b/tests/validation/CPP/WarpAffine.cpp
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "WarpAffine.h"
+
+#include "Utils.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+bool valid_bilinear_policy(float xn, float yn, int width, int height, BorderMode border_mode)
+{
+ if(border_mode != BorderMode::UNDEFINED)
+ {
+ return true;
+ }
+ if((0 <= yn + 1) && (yn + 1 < height) && (0 <= xn + 1) && (xn + 1 < width))
+ {
+ return true;
+ }
+ return false;
+}
+
+template <typename T>
+SimpleTensor<T> warp_affine(const SimpleTensor<T> &src, SimpleTensor<T> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode, uint8_t constant_border_value)
+{
+ SimpleTensor<T> dst(src.shape(), src.data_type());
+
+ // x0 = M00 * x + M01 * y + M02
+ // y0 = M10 * x + M11 * y + M12
+ const float M00 = matrix[0];
+ const float M10 = matrix[1];
+ const float M01 = matrix[0 + 1 * 2];
+ const float M11 = matrix[1 + 1 * 2];
+ const float M02 = matrix[0 + 2 * 2];
+ const float M12 = matrix[1 + 2 * 2];
+
+ const int width = src.shape().x();
+ const int height = src.shape().y();
+
+ for(int element_idx = 0; element_idx < src.num_elements(); ++element_idx)
+ {
+ valid_mask[element_idx] = 1;
+ Coordinates id = index2coord(src.shape(), element_idx);
+ int idx = id.x();
+ int idy = id.y();
+
+ float x0 = M00 * idx + M01 * idy + M02;
+ float y0 = M10 * idx + M11 * idy + M12;
+
+ id.set(0, static_cast<int>(std::floor(x0)));
+ id.set(1, static_cast<int>(std::floor(y0)));
+ if((0 <= y0) && (y0 < height) && (0 <= x0) && (x0 < width))
+ {
+ switch(policy)
+ {
+ case InterpolationPolicy::NEAREST_NEIGHBOR:
+ dst[element_idx] = tensor_elem_at(src, id, border_mode, constant_border_value);
+ break;
+ case InterpolationPolicy::BILINEAR:
+ (valid_bilinear_policy(x0, y0, width, height, border_mode)) ? dst[element_idx] = bilinear_policy(src, id, x0, y0, border_mode, constant_border_value) :
+ valid_mask[element_idx] = 0;
+ break;
+ case InterpolationPolicy::AREA:
+ default:
+ ARM_COMPUTE_ERROR("Interpolation not supported");
+ }
+ }
+ else
+ {
+ if(border_mode == BorderMode::UNDEFINED)
+ {
+ valid_mask[element_idx] = 0;
+ }
+ else
+ {
+ switch(policy)
+ {
+ case InterpolationPolicy::NEAREST_NEIGHBOR:
+ if(border_mode == BorderMode::CONSTANT)
+ {
+ dst[element_idx] = constant_border_value;
+ }
+ else if(border_mode == BorderMode::REPLICATE)
+ {
+ id.set(0, std::max(0, std::min(static_cast<int>(x0), width - 1)));
+ id.set(1, std::max(0, std::min(static_cast<int>(y0), height - 1)));
+ dst[element_idx] = src[coord2index(src.shape(), id)];
+ }
+ break;
+ case InterpolationPolicy::BILINEAR:
+ dst[element_idx] = bilinear_policy(src, id, x0, y0, border_mode, constant_border_value);
+ break;
+ case InterpolationPolicy::AREA:
+ default:
+ ARM_COMPUTE_ERROR("Interpolation not supported");
+ }
+ }
+ }
+ }
+
+ return dst;
+}
+
+template SimpleTensor<uint8_t> warp_affine(const SimpleTensor<uint8_t> &src, SimpleTensor<uint8_t> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode,
+ uint8_t constant_border_value);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute
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