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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_index_mask.hh"
namespace blender {
IndexMask IndexMask::slice(IndexRange slice) const
{
return IndexMask(indices_.slice(slice));
}
IndexMask IndexMask::slice_and_offset(const IndexRange slice, Vector<int64_t> &r_new_indices) const
{
const int slice_size = slice.size();
if (slice_size == 0) {
return {};
}
IndexMask sliced_mask{indices_.slice(slice)};
if (sliced_mask.is_range()) {
return IndexMask(slice_size);
}
const int64_t offset = sliced_mask.indices().first();
if (offset == 0) {
return sliced_mask;
}
r_new_indices.resize(slice_size);
for (const int i : IndexRange(slice_size)) {
r_new_indices[i] = sliced_mask[i] - offset;
}
return IndexMask(r_new_indices.as_span());
}
} // namespace blender
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