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[metrics] Scale up horizontal caret rise/run 

Eg. if rise/run are 1/0, we now return upem/0. This is equivalent.

Part of https://github.com/harfbuzz/harfbuzz/pull/3338
This commit is contained in:
Behdad Esfahbod 2022-01-02 10:41:41 -07:00
parent 602bd39680
commit fc329f665f
1 changed files with 13 additions and 2 deletions
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15
src/hb-ot-metrics.cc
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@ -160,9 +160,20 @@ hb_ot_metrics_get_position (hb_font_t *font,
(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);
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: return GET_METRIC_Y (hhea, caretSlopeRise);
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: return GET_METRIC_X (hhea, caretSlopeRun);
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:
{
unsigned rise = face->table.hhea->caretSlopeRise;
unsigned upem = face->get_upem ();
unsigned mult = rise < upem ? upem / rise : 1;
if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE)
return mult * GET_METRIC_Y (hhea, caretSlopeRise);
else
return mult * GET_METRIC_X (hhea, caretSlopeRun);
}
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: return GET_METRIC_X (hhea, caretOffset);
#ifndef HB_NO_VERTICAL
case HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: return GET_METRIC_X (vhea, caretSlopeRise);
case HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: return GET_METRIC_Y (vhea, caretSlopeRun);