From 73c32258a4380eb42452e3f2da7f6bc01d57ef0e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Wang?= <fwang@igalia.com>
Date: Fri, 6 Mar 2020 12:16:10 +0100
Subject: [PATCH] Fix glyph assembly data for
 axisheight5000-verticalarrow14000.woff (#22084)

* Make full advance of the "bot" match the glyph height (19em).
  instead of the incorrect 1em value.
* Force min overlap to be 0 and max part overlap to be 1em, so
  that GlyphAssembly is valid per [1] and the engine has
  flexibility to adjust the overlap in order to match the target
  size.

[1] https://mathml-refresh.github.io/mathml-core/#the-glyphassembly-table
"For each GlyphPartRecord in GlyphAssembly.partRecords, the values of GlyphPartRecord.startConnectorLength and GlyphPartRecord.endConnectorLength must be at least omin. Otherwise, it is not possible to satisfy the condition of MathVariant.minConnectorOverlap."
---
 .../axisheight5000-verticalarrow14000.woff    | Bin 1336 -> 1344 bytes
 mathml/tools/axisheight.py                    |   4 +++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fonts/math/axisheight5000-verticalarrow14000.woff b/fonts/math/axisheight5000-verticalarrow14000.woff
index 9f5d59ae6a7fbf221fd14126645f1cbc7c25d286..70f366a3d0b7ec891fc4041584a1ddea55b0bc42 100644
GIT binary patch
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diff --git a/mathml/tools/axisheight.py b/mathml/tools/axisheight.py
index 43827e7031665b..d588560b650af0 100644
--- a/mathml/tools/axisheight.py
+++ b/mathml/tools/axisheight.py
@@ -8,6 +8,7 @@
 v2 = 14 * mathfont.em
 f = mathfont.create("axisheight%d-verticalarrow%d" % (v1, v2))
 f.math.AxisHeight = v1
+f.math.MinConnectorOverlap = 0
 mathfont.createSquareGlyph(f, verticalArrowCodePoint)
 g = f.createChar(-1, "size1")
 mathfont.drawRectangleGlyph(g, mathfont.em, v2 / 2, 0)
@@ -18,6 +19,7 @@
 g = f.createChar(-1, "ext")
 mathfont.drawRectangleGlyph(g, mathfont.em, mathfont.em, 0)
 f[verticalArrowCodePoint].verticalVariants = "uni21A8 size1 size2"
+# Part: (glyphName, isExtender, startConnector, endConnector, fullAdvance)
 f[verticalArrowCodePoint].verticalComponents = \
-  (("bot", False, 0, 0, mathfont.em), ("ext", True, 0, 0, mathfont.em));
+  (("bot", False, 0, mathfont.em, v2 + v1), ("ext", True, mathfont.em, mathfont.em, mathfont.em));
 mathfont.save(f)