diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-metrics.cc')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-metrics.cc | 151 |
1 files changed, 145 insertions, 6 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-metrics.cc b/thirdparty/harfbuzz/src/hb-ot-metrics.cc index 103808cf91..5b12482b97 100644 --- a/thirdparty/harfbuzz/src/hb-ot-metrics.cc +++ b/thirdparty/harfbuzz/src/hb-ot-metrics.cc @@ -71,12 +71,12 @@ _hb_ot_metrics_get_position_common (hb_font_t *font, #endif #define GET_METRIC_X(TABLE, ATTR) \ (face->table.TABLE->has_data () && \ - (position && (*position = font->em_scalef_x (_fix_ascender_descender ( \ - face->table.TABLE->ATTR + GET_VAR, metrics_tag))), true)) + ((void) (position && (*position = font->em_scalef_x (_fix_ascender_descender ( \ + face->table.TABLE->ATTR + GET_VAR, metrics_tag)))), true)) #define GET_METRIC_Y(TABLE, ATTR) \ (face->table.TABLE->has_data () && \ - (position && (*position = font->em_scalef_y (_fix_ascender_descender ( \ - face->table.TABLE->ATTR + GET_VAR, metrics_tag))), true)) + ((void) (position && (*position = font->em_scalef_y (_fix_ascender_descender ( \ + face->table.TABLE->ATTR + GET_VAR, metrics_tag)))), true)) case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER: return (face->table.OS2->use_typo_metrics () && GET_METRIC_Y (OS2, sTypoAscender)) || @@ -154,10 +154,10 @@ hb_ot_metrics_get_position (hb_font_t *font, #endif #define GET_METRIC_X(TABLE, ATTR) \ (face->table.TABLE->has_data () && \ - (position && (*position = font->em_scalef_x (face->table.TABLE->ATTR + GET_VAR)), true)) + ((void) (position && (*position = font->em_scalef_x (face->table.TABLE->ATTR + GET_VAR))), true)) #define GET_METRIC_Y(TABLE, ATTR) \ (face->table.TABLE->has_data () && \ - (position && (*position = font->em_scalef_y (face->table.TABLE->ATTR + GET_VAR)), true)) + ((void) (position && (*position = font->em_scalef_y (face->table.TABLE->ATTR + GET_VAR))), true)) case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: return GET_METRIC_Y (OS2, usWinAscent); case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: return GET_METRIC_Y (OS2, usWinDescent); @@ -238,6 +238,145 @@ hb_ot_metrics_get_position (hb_font_t *font, } } +/** + * hb_ot_metrics_get_position_with_fallback: + * @font: an #hb_font_t object. + * @metrics_tag: tag of metrics value you like to fetch. + * @position: (out) (optional): result of metrics value from the font. + * + * Fetches metrics value corresponding to @metrics_tag from @font, + * and synthesizes a value if it the value is missing in the font. + * + * Since: 4.0.0 + **/ +void +hb_ot_metrics_get_position_with_fallback (hb_font_t *font, + hb_ot_metrics_tag_t metrics_tag, + hb_position_t *position /* OUT */) +{ + hb_font_extents_t font_extents; + hb_codepoint_t glyph; + hb_glyph_extents_t extents; + + if (hb_ot_metrics_get_position (font, metrics_tag, position)) + { + if ((metrics_tag != HB_OT_METRICS_TAG_STRIKEOUT_SIZE && + metrics_tag != HB_OT_METRICS_TAG_UNDERLINE_SIZE) || + *position != 0) + return; + } + + switch (metrics_tag) + { + case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER: + case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: + hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents); + *position = font_extents.ascender; + break; + + case HB_OT_METRICS_TAG_VERTICAL_ASCENDER: + hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents); + *position = font_extents.ascender; + break; + + case HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER: + case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: + hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents); + *position = font_extents.descender; + break; + + case HB_OT_METRICS_TAG_VERTICAL_DESCENDER: + hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents); + *position = font_extents.ascender; + break; + + case HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP: + hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents); + *position = font_extents.line_gap; + break; + + case HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: + hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents); + *position = font_extents.line_gap; + break; + + case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: + case HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: + *position = 1; + break; + + case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: + case HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: + *position = 0; + break; + + case HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: + case HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET: + *position = 0; + break; + + case HB_OT_METRICS_TAG_X_HEIGHT: + if (hb_font_get_nominal_glyph (font, 'x', &glyph) && + hb_font_get_glyph_extents (font, glyph, &extents)) + *position = extents.y_bearing; + else + *position = font->y_scale / 2; + break; + + case HB_OT_METRICS_TAG_CAP_HEIGHT: + if (hb_font_get_nominal_glyph (font, 'O', &glyph) && + hb_font_get_glyph_extents (font, glyph, &extents)) + *position = extents.height + 2 * extents.y_bearing; + else + *position = font->y_scale * 2 / 3; + break; + + case HB_OT_METRICS_TAG_STRIKEOUT_SIZE: + case HB_OT_METRICS_TAG_UNDERLINE_SIZE: + *position = font->y_scale / 18; + break; + + case HB_OT_METRICS_TAG_STRIKEOUT_OFFSET: + { + hb_position_t ascender; + hb_ot_metrics_get_position_with_fallback (font, + HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, + &ascender); + *position = ascender / 2; + } + break; + + case HB_OT_METRICS_TAG_UNDERLINE_OFFSET: + *position = - font->y_scale / 18; + break; + + case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE: + case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE: + *position = font->x_scale * 10 / 12; + break; + + case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE: + case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE: + *position = font->y_scale * 10 / 12; + break; + + case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET: + case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET: + *position = 0; + break; + + case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET: + case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET: + *position = font->y_scale / 5; + break; + + case _HB_OT_METRICS_TAG_MAX_VALUE: + default: + *position = 0; + break; + } +} + #ifndef HB_NO_VAR /** * hb_ot_metrics_get_variation: |