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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#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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