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Code Issues 1 Projects Releases Wiki Activity Actions 9

[layout] Add hb_ot_layout_get_font_extents()

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Untested.

Fixes https://github.com/harfbuzz/harfbuzz/issues/3290
This commit is contained in:
Behdad Esfahbod 2023-05-19 11:06:26 -06:00
parent 134cc8edfa
commit 3e110c69c4
4 changed files with 29 additions and 2 deletions
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1
docs/harfbuzz-sections.txt
View file

@ -626,6 +626,7 @@ hb_ot_layout_feature_get_lookups
hb_ot_layout_feature_get_name_ids
hb_ot_layout_feature_with_variations_get_lookups
hb_ot_layout_get_attach_points
hb_ot_layout_get_font_extents
hb_ot_layout_get_horizontal_baseline_tag_for_script
hb_ot_layout_get_baseline
hb_ot_layout_get_baseline_with_fallback

3
src/hb-ot-layout-base-table.hh
View file

@ -473,14 +473,13 @@ struct BASE
return true;
}
/* TODO: Expose this separately sometime? */
bool get_min_max (hb_font_t *font,
hb_direction_t direction,
hb_tag_t script_tag,
hb_tag_t language_tag,
hb_tag_t feature_tag,
hb_position_t *min,
hb_position_t *max)
hb_position_t *max) const
{
const BaseCoord *min_coord, *max_coord;
if (!get_axis (direction).get_min_max (script_tag, language_tag, feature_tag,

21
src/hb-ot-layout.cc
View file

@ -2036,6 +2036,27 @@ hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
}
#ifndef HB_NO_BASE
hb_bool_t
hb_ot_layout_get_font_extents (hb_font_t *font,
hb_direction_t direction,
hb_tag_t script_tag,
hb_tag_t language_tag,
hb_font_extents_t *extents)
{
hb_position_t min, max;
if (font->face->table.BASE->get_min_max (font, direction, script_tag, language_tag, HB_TAG_NONE,
&min, &max))
{
extents->ascender = max;
extents->descender = min;
extents->line_gap = 0;
return true;
}
return false;
}
/**
* hb_ot_layout_get_horizontal_baseline_tag_for_script:
* @script: a script tag.

6
src/hb-ot-layout.h
View file

@ -447,6 +447,12 @@ hb_ot_layout_feature_get_characters (hb_face_t *face,
* BASE
*/
HB_EXTERN hb_bool_t
hb_ot_layout_get_font_extents (hb_font_t *font,
hb_direction_t direction,
hb_tag_t script_tag,
hb_tag_t language_tag,
hb_font_extents_t *extents);
/**
* hb_ot_layout_baseline_tag_t:
* @HB_OT_LAYOUT_BASELINE_TAG_ROMAN: The baseline used by alphabetic scripts such as Latin, Cyrillic and Greek.