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-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.h b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.h
index 3b9a78eafe4..5124c1e1f40 100644
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.h
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.h
@@ -402,6 +402,55 @@ hb_ot_layout_feature_get_characters (hb_face_t *face,
unsigned int *char_count /* IN/OUT. May be NULL */,
hb_codepoint_t *characters /* OUT. May be NULL */);
+/*
+ * BASE
+ */
+
+/**
+ * hb_ot_layout_baseline_tag_t:
+ * @HB_OT_LAYOUT_BASELINE_TAG_ROMAN: The baseline used by alphabetic scripts such as Latin, Cyrillic and Greek.
+ * In vertical writing mode, the alphabetic baseline for characters rotated 90 degrees clockwise.
+ * (This would not apply to alphabetic characters that remain upright in vertical writing mode, since these
+ * characters are not rotated.)
+ * @HB_OT_LAYOUT_BASELINE_TAG_HANGING: The hanging baseline. In horizontal direction, this is the horizontal
+ * line from which syllables seem, to hang in Tibetan and other similar scripts. In vertical writing mode,
+ * for Tibetan (or some other similar script) characters rotated 90 degrees clockwise.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT: Ideographic character face bottom or left edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT: Ideographic character face top or right edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT: Ideographic em-box bottom or left edge,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT: Ideographic em-box top or right edge baseline,
+ * if the direction is horizontal or vertical, respectively.
+ * @HB_OT_LAYOUT_BASELINE_TAG_MATH: The baseline about which mathematical characters are centered.
+ * In vertical writing mode when mathematical characters rotated 90 degrees clockwise, are centered.
+ *
+ * Baseline tags from https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags
+ *
+ * Since: 2.6.0
+ */
+typedef enum {
+ HB_OT_LAYOUT_BASELINE_TAG_ROMAN = HB_TAG ('r','o','m','n'),
+ HB_OT_LAYOUT_BASELINE_TAG_HANGING = HB_TAG ('h','a','n','g'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT = HB_TAG ('i','c','f','b'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT = HB_TAG ('i','c','f','t'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT = HB_TAG ('i','d','e','o'),
+ HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT = HB_TAG ('i','d','t','p'),
+ HB_OT_LAYOUT_BASELINE_TAG_MATH = HB_TAG ('m','a','t','h'),
+
+ _HB_OT_LAYOUT_BASELINE_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
+} hb_ot_layout_baseline_tag_t;
+
+HB_EXTERN hb_bool_t
+hb_ot_layout_get_baseline (hb_font_t *font,
+ hb_ot_layout_baseline_tag_t baseline_tag,
+ hb_direction_t direction,
+ hb_tag_t script_tag,
+ hb_tag_t language_tag,
+ hb_position_t *coord /* OUT. May be NULL. */);
+
+
HB_END_DECLS
#endif /* HB_OT_LAYOUT_H */