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[base] Add documentation for baseline tags from ot spec

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Ebrahim Byagowi 2019-08-03 14:06:46 +04:30 committed by GitHub
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src/hb-ot-layout.h
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@ -408,8 +408,25 @@ hb_ot_layout_feature_get_characters (hb_face_t *face,
/**
* 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.
*
* https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags
* Baseline tags from https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags
*
* Since: REPLACEME
*/