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Diffstat (limited to 'src/core/Helpers.cpp')
-rw-r--r-- | src/core/Helpers.cpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/core/Helpers.cpp b/src/core/Helpers.cpp index 0e7cd99eab..c39922bf03 100644 --- a/src/core/Helpers.cpp +++ b/src/core/Helpers.cpp @@ -173,3 +173,75 @@ Window arm_compute::calculate_max_window_horizontal(const ValidRegion &valid_reg return window; } + +ValidRegion arm_compute::calculate_valid_region_scale(const ITensorInfo &src_info, const TensorShape &dst_shape, + InterpolationPolicy interpolate_policy, SamplingPolicy sampling_policy, bool border_undefined) +{ + const float scale_x = static_cast<float>(dst_shape[0]) / src_info.tensor_shape()[0]; + const float scale_y = static_cast<float>(dst_shape[1]) / src_info.tensor_shape()[1]; + const float sampling_point = (sampling_policy == SamplingPolicy::CENTER) ? 0.5f : 0.0f; + + // Get input's valid region start and end points + const int valid_start_in_x = src_info.valid_region().anchor[0]; + const int valid_start_in_y = src_info.valid_region().anchor[1]; + const int valid_end_in_x = src_info.valid_region().anchor[0] + src_info.valid_region().shape[0]; + const int valid_end_in_y = src_info.valid_region().anchor[1] + src_info.valid_region().shape[1]; + + // Initialize output's valid region start and end points + auto valid_start_out_x = static_cast<int>(valid_start_in_x * scale_x); + auto valid_start_out_y = static_cast<int>(valid_start_in_y * scale_y); + auto valid_end_out_x = std::min<int>(std::ceil(valid_end_in_x * scale_x), dst_shape[0]); + auto valid_end_out_y = std::min<int>(std::ceil(valid_end_in_y * scale_y), dst_shape[1]); + + // Handle valid points in case of the bi-linear interpolation + if(border_undefined) + { + switch(interpolate_policy) + { + case InterpolationPolicy::NEAREST_NEIGHBOR: + { + // (start_out + sampling_point) >= (start_in * scale) + // start_out = ceil((start_in * scale) - sampling_point) + valid_start_out_x = std::ceil(valid_start_in_x * scale_x - sampling_point); + valid_start_out_y = std::ceil(valid_start_in_y * scale_y - sampling_point); + + // (end_out - 1 + sampling_point) < (end_in * scale) + // end_out = ceil((end_in * scale) - sampling_point); // <-- ceil(x - 1) strictly less + valid_end_out_x = std::ceil(valid_end_in_x * scale_x - sampling_point); + valid_end_out_y = std::ceil(valid_end_in_y * scale_y - sampling_point); + break; + } + case InterpolationPolicy::BILINEAR: + { + // (start_out + sampling_point) >= ((start_in + sampling_point) * scale) + // start_out = ceil(((start_in + sampling_point) * scale) - sampling_point) + valid_start_out_x = std::ceil((valid_start_in_x + sampling_point) * scale_x - sampling_point); + valid_start_out_y = std::ceil((valid_start_in_y + sampling_point) * scale_y - sampling_point); + + // (end_out - 1 + sampling_point) <= ((end_in - 1 + sampling_point) * scale) + // end_out = floor(((end_in - 1 + sampling_point) * scale) - sampling_point + 1) + valid_end_out_x = std::floor((valid_end_in_x - 1.f + sampling_point) * scale_x - sampling_point + 1.f); + valid_end_out_y = std::floor((valid_end_in_y - 1.f + sampling_point) * scale_y - sampling_point + 1.f); + break; + } + case InterpolationPolicy::AREA: + break; + default: + { + ARM_COMPUTE_ERROR("Invalid InterpolationPolicy"); + break; + } + } + } + + // Setup output valid region + ValidRegion valid_region{ Coordinates(), dst_shape, src_info.tensor_shape().num_dimensions() }; + + valid_region.anchor.set(0, std::max(0, valid_start_out_x)); + valid_region.anchor.set(1, std::max(0, valid_start_out_y)); + + valid_region.shape.set(0, std::min<size_t>(valid_end_out_x - valid_start_out_x, dst_shape[0])); + valid_region.shape.set(1, std::min<size_t>(valid_end_out_y - valid_start_out_y, dst_shape[1])); + + return valid_region; +}
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