diff -r 000000000000 -r 6474c204b198 layout/reftests/fonts/math/generate.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/fonts/math/generate.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,231 @@
+#!/usr/bin/python
+# vim: set shiftwidth=4 tabstop=8 autoindent expandtab:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# For general fontforge documentation, see:
+#   http://fontforge.sourceforge.net/
+# For fontforge scripting documentation, see:
+#   http://fontforge.sourceforge.net/scripting-tutorial.html
+#   http://fontforge.sourceforge.net/scripting.html
+# and most importantly:
+#   http://fontforge.sourceforge.net/python.html
+
+# To install what you need, on Ubuntu,
+#   sudo apt-get install python-fontforge
+
+from __future__ import print_function
+import fontforge
+
+em = 1000
+
+def newMathFont(aName):
+    print("Generating %s.otf..." % aName, end="")
+    mathFont = fontforge.font()
+    mathFont.fontname = aName
+    mathFont.familyname = aName
+    mathFont.fullname = aName
+    mathFont.copyright = "Copyright (c) 2014 Mozilla Corporation"
+    mathFont.encoding = "UnicodeFull"
+
+    # Create a space character. Also force the creation of some MATH subtables
+    # so that OTS will not reject the MATH table.
+    g = mathFont.createChar(ord(" "), "space")
+    g.width = em
+    g.italicCorrection = 0
+    g.topaccent = 0
+    g.mathKern.bottomLeft = tuple([(0,0)])
+    g.mathKern.bottomRight = tuple([(0,0)])
+    g.mathKern.topLeft = tuple([(0,0)])
+    g.mathKern.topRight = tuple([(0,0)])
+    mathFont[ord(" ")].horizontalVariants = "space"
+    mathFont[ord(" ")].verticalVariants = "space"
+    return mathFont
+
+def saveMathFont(aFont):
+    aFont.em = em
+    aFont.ascent = aFont.descent = em/2
+    aFont.hhea_ascent = aFont.os2_typoascent = aFont.os2_winascent = em/2
+    aFont.descent = aFont.hhea_descent = em/2
+    aFont.os2_typodescent = aFont.os2_windescent = em/2
+    aFont.hhea_ascent_add = aFont.hhea_descent_add = 0
+    aFont.os2_typoascent_add = aFont.os2_typodescent_add = 0
+    aFont.os2_winascent_add = aFont.os2_windescent_add = 0
+    aFont.os2_use_typo_metrics = True
+    aFont.generate(aFont.fontname + ".otf")
+    print(" done.")
+
+################################################################################
+# Glyph variants and constructions
+f = newMathFont("stretchy")
+nvariants = 3
+
+# Draw boxes for the size variants and glues
+for i in range(0, nvariants):
+    s = em * (i + 1)
+
+    g = f.createChar(-1, "h%d" % i)
+    p = g.glyphPen()
+    p.moveTo(0, -em)
+    p.lineTo(0, em)
+    p.lineTo(s, em)
+    p.lineTo(s, -em)
+    p.closePath()
+    g.width = s
+
+    g = f.createChar(-1, "v%d" % i)
+    p = g.glyphPen()
+    p.moveTo(0, 0)
+    p.lineTo(0, s)
+    p.lineTo(2 * em, s)
+    p.lineTo(2 * em, 0)
+    p.closePath();
+    g.width = 2 * em
+
+# Draw some pieces for stretchy operators
+s = em * nvariants
+
+g = f.createChar(-1, "left")
+p = g.glyphPen()
+p.moveTo(0, -2 * em)
+p.lineTo(0, 2 * em)
+p.lineTo(s, em)
+p.lineTo(s, -em)
+p.closePath();
+g.width = s
+
+g = f.createChar(-1, "right")
+p = g.glyphPen()
+p.moveTo(0, -em)
+p.lineTo(0, em)
+p.lineTo(s, 2 * em)
+p.lineTo(s, -2 * em)
+p.closePath();
+g.width = s
+
+g = f.createChar(-1, "hmid")
+p = g.glyphPen()
+p.moveTo(0, -em)
+p.lineTo(0, em)
+p.lineTo(s, 2 * em)
+p.lineTo(2 * s, em)
+p.lineTo(2 * s, -em)
+p.lineTo(s, -2 * em)
+p.closePath();
+g.width = 2 * s
+
+g = f.createChar(-1, "bottom")
+p = g.glyphPen()
+p.moveTo(0, 0)
+p.lineTo(0, s)
+p.lineTo(2 * em, s)
+p.lineTo(4 * em, 0)
+p.closePath();
+g.width = 4 * em
+
+g = f.createChar(-1, "top")
+p = g.glyphPen()
+p.moveTo(0, 0)
+p.lineTo(4 * em, 0)
+p.lineTo(2 * em, -s)
+p.lineTo(0, -s)
+p.closePath();
+g.width = 4 * em
+
+g = f.createChar(-1, "vmid")
+p = g.glyphPen()
+p.moveTo(0, s)
+p.lineTo(2 * em, s)
+p.lineTo(4 * em, 0)
+p.lineTo(2 * em, -s)
+p.lineTo(0, -s)
+p.closePath();
+g.width = 3 * em
+
+# Create small rectangle of various size for some exotic arrows that are
+# unlikely to be stretchable with standard fonts.
+hstretchy = [
+    0x219C, # leftwards wave arrow
+    0x219D, # rightwards wave arrow
+    0x219E, # leftwards two headed arrow
+    0x21A0, # rightwards two headed arrow
+    0x21A2  # leftwards arrow with tail
+]
+vstretchy = [
+    0x219F, # upwards two headed arrow
+    0x21A1, # downwards two headed arrow
+    0x21A5, # upwards arrow from bar
+    0x21A7, # downwards arrow from bar
+    0x21A8  # up down arrow with base
+]
+for i in range(0, 1 + nvariants + 1):
+    s = (i + 1) * em/10
+
+    g = f.createChar(hstretchy[i])
+    p = g.glyphPen()
+    p.moveTo(0, -em/10)
+    p.lineTo(0, em/10)
+    p.lineTo(s, em/10)
+    p.lineTo(s, -em/10)
+    p.closePath()
+    g.width = s
+
+    g = f.createChar(vstretchy[i])
+    p = g.glyphPen()
+    p.moveTo(0, 0)
+    p.lineTo(0, s)
+    p.lineTo(2 * em/10, s)
+    p.lineTo(2 * em/10, 0)
+    p.closePath();
+    g.width = 2 * em/10
+
+# hstretchy[0] and vstretchy[0] have all the variants and the components. The others only have one of them.
+s = em * nvariants
+
+f[hstretchy[0]].horizontalVariants = "uni219C h0 h1 h2"
+f[hstretchy[0]].horizontalComponents = (("left", False, 0, 0, s), \
+("h2", True, 0, 0, s), ("hmid", False, 0, 0, 2 * s), ("h2", True, 0, 0, s), \
+("right", False, 0, 0, s))
+
+f[hstretchy[1]].horizontalVariants = "uni219D h0"
+f[hstretchy[2]].horizontalVariants = "uni219E h1"
+f[hstretchy[3]].horizontalVariants = "uni21A0 h2"
+f[hstretchy[4]].horizontalVariants = "uni21A2 h2"
+f[hstretchy[4]].horizontalComponents = f[hstretchy[0]].horizontalComponents
+
+f[vstretchy[0]].verticalVariants = "uni219F v0 v1 v2"
+f[vstretchy[0]].verticalComponents = (("bottom", False, 0, 0, s), \
+("v2", True, 0, 0, s), ("vmid", False, 0, 0, 2 * s), ("v2", True, 0, 0, s), \
+("top", False, 0, 0, s))
+
+f[vstretchy[1]].verticalVariants = "uni21A1 v0"
+f[vstretchy[2]].verticalVariants = "uni21A5 v1"
+f[vstretchy[3]].verticalVariants = "uni21A7 v2"
+f[vstretchy[4]].verticalVariants = "uni21A8"
+f[vstretchy[4]].verticalComponents = f[vstretchy[0]].verticalComponents
+
+################################################################################
+# Testing DisplayOperatorMinHeight
+f.math.DisplayOperatorMinHeight =  8 * em
+largeop = [0x2A1B, 0x2A1C] # integral with overbar/underbar
+
+# Draw boxes of size 1, 2, 7, 8, 9em.
+for i in [1, 2, 7, 8, 9]:
+    s = em * i
+    if i == 1 or i == 2:
+        g = f.createChar(largeop[i-1])
+    else:
+        g = f.createChar(-1, "L%d" % i)
+    p = g.glyphPen()
+    p.moveTo(0, 0)
+    p.lineTo(0, s)
+    p.lineTo(s, s)
+    p.lineTo(s, 0)
+    p.closePath();
+    g.width = s
+
+f[largeop[0]].verticalVariants = "uni2A1B L7 L8 L9"
+f[largeop[1]].verticalVariants = "uni2A1C L8"
+
+saveMathFont(f)