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-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.h b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.h
index 08e52dbd2d1..6a2c5f61148 100644
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.h
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-subset.h
@@ -70,6 +70,14 @@ 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_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 +94,8 @@ typedef enum { /*< flags >*/
HB_SUBSET_FLAGS_NOTDEF_OUTLINE = 0x00000040u,
HB_SUBSET_FLAGS_GLYPH_NAMES = 0x00000080u,
HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES = 0x00000100u,
+ // Not supported yet: HB_SUBSET_FLAGS_PATCH_MODE = 0x00000200u,
+ // Not supported yet: HB_SUBSET_FLAGS_OMIT_GLYF = 0x00000400u,
} hb_subset_flags_t;
/**
@@ -169,6 +179,13 @@ hb_subset_input_pin_axis_location (hb_subset_input_t *input,
#endif
#endif
+#ifdef HB_EXPERIMENTAL_API
+
+HB_EXTERN hb_face_t *
+hb_subset_preprocess (hb_face_t *source);
+
+#endif
+
HB_EXTERN hb_face_t *
hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input);