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[subset] Suggested flags to enable more performant subset production for use in incxfer.

This commit is contained in:
Garret Rieger 2022-10-13 18:53:41 +00:00
parent 294b1c9f6e
commit f105c28749
1 changed files with 14 additions and 0 deletions
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14
src/hb-subset.h
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@ -70,6 +70,17 @@ typedef struct hb_subset_plan_t hb_subset_plan_t;
* in the final subset.
* @HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES: If set then the unicode ranges in
* OS/2 will not be recalculated.
* @HB_SUBSET_FLAGS_ADD_ACCELERATOR_DATA: If set the subsetter will append into
* the output hb_face_t's user data, accelerator data that can be used to speedup
* further subsetting operations on the face.
* @HB_SUBSET_FLAGS_PATCH_MODE: If set the subsetter behaviour will be modified
* to produce a subset that is better suited to patching. For example cmap
* subtable format will be kept stable.
* @HB_SUBSET_FLAGS_OMIT_GLYF: If set the subsetter won't actually produce the final
* glyf table bytes. The table directory will include and entry as if the table was
* there but the actual final font blob will be truncated prior to the glyf data. This
* is a useful performance optimization when a font aware binary patching algorithm
* is being used to diff two subsets.
*
* List of boolean properties that can be configured on the subset input.
*
@ -86,6 +97,9 @@ typedef enum { /*< flags >*/
HB_SUBSET_FLAGS_NOTDEF_OUTLINE = 0x00000040u,
HB_SUBSET_FLAGS_GLYPH_NAMES = 0x00000080u,
HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES = 0x00000100u,
HB_SUBSET_FLAGS_ADD_ACCELERATOR_DATA = 0x00000200u,
HB_SUBSET_FLAGS_PATCH_MODE = 0x00000400u,
HB_SUBSET_FLAGS_OMIT_GLYF = 0x00000800u,
} hb_subset_flags_t;
/**