buffer_cluster_level_t#
Added in version 0.9.42.
- class buffer_cluster_level_t#
Data type for holding HarfBuzz’s clustering behavior options. The cluster level dictates one aspect of how HarfBuzz will treat non-base characters during shaping.
In HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES, non-base
characters are merged into the cluster of the base character that precedes them.
In HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS, non-base characters are initially
assigned their own cluster values, which are not merged into preceding base
clusters. This allows HarfBuzz to perform additional operations like reorder
sequences of adjacent marks.
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES is the default, because it maintains
backward compatibility with older versions of HarfBuzz. New client programs that
do not need to maintain such backward compatibility are recommended to use
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS instead of the default.