Commit: c55afdf30b33fbea9b30afe199f61951345576f4
Author: Jacques Lucke
Date: Tue Mar 29 10:07:18 2022 +0200
Branches: master
https://developer.blender.org/rBc55afdf30b33fbea9b30afe199f61951345576f4
BLI: add utility to convert IndexMask to best mask type
===================================================================
M source/blender/blenlib/BLI_index_mask.hh
===================================================================
diff --git a/source/blender/blenlib/BLI_index_mask.hh
b/source/blender/blenlib/BLI_index_mask.hh
index 3decd8b9441..b87ab0afc98 100644
--- a/source/blender/blenlib/BLI_index_mask.hh
+++ b/source/blender/blenlib/BLI_index_mask.hh
@@ -163,16 +163,30 @@ class IndexMask {
*/
template<typename CallbackT> void foreach_index(const CallbackT &callback)
const
{
- if (this->is_range()) {
- IndexRange range = this->as_range();
- for (int64_t i : range) {
+ this->to_best_mask_type([&](const auto &mask) {
+ for (const int64_t i : mask) {
callback(i);
}
+ });
+ }
+
+ /**
+ * Often an #IndexMask wraps a range of indices without any gaps. In this
case, it is more
+ * efficient to compute the indices in a loop on-the-fly instead of reading
them from memory.
+ * This method makes it easy to generate code for both cases.
+ *
+ * The given function is expected to take one parameter that can either be
of type #IndexRange or
+ * #Span<int64_t>.
+ */
+ template<typename Fn> void to_best_mask_type(const Fn &fn) const
+ {
+ if (this->is_range()) {
+ const IndexRange masked_range = this->as_range();
+ fn(masked_range);
}
else {
- for (int64_t i : indices_) {
- callback(i);
- }
+ const Span<int64_t> masked_indices = indices_;
+ fn(masked_indices);
}
}
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