extract_region_data() [1/3]

template<typename T >

std::vector< T > MayaFlux::Kakshya::extract_region_data	(	const std::span< const T > &	source_data,
		const Region &	region,
		const std::vector< DataDimension > &	dimensions
	)

Extract a region of data from a flat data span using a Region and dimension info.

Template Parameters

T	Data type.

Parameters

source_data	Source data span.
region	Region to extract.
dimensions	Dimension descriptors.

Returns

Vector containing the extracted region data.

Exceptions

std::out_of_range

if region is out of bounds.

Definition at line 67 of file RegionUtils.hpp.

{
    for (size_t i = 0; i < region.start_coordinates.size(); ++i) {
        if (region.end_coordinates[i] > 0 && (region.end_coordinates[i] >= dimensions[i].size)) {
            throw std::out_of_range("Requested region is out of bounds for dimension " + std::to_string(i));
        }
    }
 
    uint64_t region_size = region.get_volume();
    std::vector<T> result;
    result.reserve(region_size);
 
    std::vector<uint64_t> current = region.start_coordinates;
    while (true) {
        uint64_t linear_index = coordinates_to_linear(current, dimensions);
        result.push_back(source_data[linear_index]);
 
        bool done = true;
        for (int dim = current.size() - 1; dim >= 0; --dim) {
            if (current[dim] < region.end_coordinates[dim]) {
                current[dim]++;
                done = false;
                break;
            }
            current[dim] = region.start_coordinates[dim];
        }
        if (done)
            break;
    }
    return result;
}

References coordinates_to_linear(), MayaFlux::Kakshya::Region::end_coordinates, MayaFlux::Kakshya::Region::get_volume(), and MayaFlux::Kakshya::Region::start_coordinates.

Referenced by extract_region(), extract_region(), extract_region_data(), and extract_region_data().

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