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Merge pull request #1844 from ebraminio/hhea 

Fallback hhea's ascender/descender to OS2
This commit is contained in:
Ebrahim Byagowi 2019-07-20 13:16:16 +04:30 committed by GitHub
parent ec8dde8142 08b48e89d3
commit ac8b6e330a
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 12 deletions
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12
src/hb-ot-metrics-internal.cc
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@ -60,14 +60,14 @@ hb_ot_metrics_get_position_internal (hb_face_t *face,
(face->table.TABLE->has_data () && \
(position && (*position = face->table.TABLE->ATTR + GET_VAR), true))
case HB_OT_METRICS_HORIZONTAL_ASCENDER:
return (face->table.OS2->use_typo_metrics () && GET_METRIC (OS2, sTypoAscender)) ||
GET_METRIC (hhea, ascender);
return (!face->table.OS2->use_typo_metrics () && GET_METRIC (hhea, ascender)) ||
GET_METRIC (OS2, sTypoAscender);
case HB_OT_METRICS_HORIZONTAL_DESCENDER:
return (face->table.OS2->use_typo_metrics () && GET_METRIC (OS2, sTypoDescender)) ||
GET_METRIC (hhea, descender);
return (!face->table.OS2->use_typo_metrics () && GET_METRIC (hhea, descender)) ||
GET_METRIC (OS2, sTypoDescender);
case HB_OT_METRICS_HORIZONTAL_LINE_GAP:
return (face->table.OS2->use_typo_metrics () && GET_METRIC (OS2, sTypoLineGap)) ||
GET_METRIC (hhea, lineGap);
return (!face->table.OS2->use_typo_metrics () && GET_METRIC (hhea, lineGap)) ||
GET_METRIC (OS2, sTypoLineGap);
case HB_OT_METRICS_HORIZONTAL_CLIPPING_ASCENT: return GET_METRIC (OS2, usWinAscent);
case HB_OT_METRICS_HORIZONTAL_CLIPPING_DESCENT: return GET_METRIC (OS2, usWinDescent);
case HB_OT_METRICS_VERTICAL_ASCENDER: return GET_METRIC (vhea, ascender);

3
src/hb-ot-os2-table.hh
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@ -203,6 +203,7 @@ struct OS2
*max_cp = codepoints->get_max ();
}
/* https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681 */
enum font_page_t {
HEBREW_FONT_PAGE = 0xB100, // Hebrew Windows 3.1 font page
SIMP_ARABIC_FONT_PAGE = 0xB200, // Simplified Arabic Windows 3.1 font page
@ -212,8 +213,6 @@ struct OS2
TRAD_FARSI_FONT_PAGE = 0xBB00, // Traditional Farsi Windows 3.1 font page
THAI_FONT_PAGE = 0xDE00 // Thai Windows 3.1 font page
};
// https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681
font_page_t get_font_page () const
{ return (font_page_t) (version == 0 ? fsSelection & 0xFF00 : 0); }