[fonttools] Flesh out

12 files changed, 648 insertions, 87 deletions

diff --git a/fonttools/behdad.png b/fonttools/behdad.png
index b9ed80f..7a07e71 100644
--- a/fonttools/behdad.png
+++ b/fonttools/behdad.png
diff --git a/fonttools/fonttools_slides.py b/fonttools/fonttools_slides.py
index a95d6de..1bebe92 100755
--- a/fonttools/fonttools_slides.py
+++ b/fonttools/fonttools_slides.py
@@ -23,9 +23,16 @@
 # The more useful of them here are put_text, put_image, and
 # set_allocation.  See their pydocs.
 
+title_font="Cinzel"
+head_font="Julius Sans One Bold"
+body_font="Merriweather Sans Light"
+
 slides = []
 def slide_add(f, data=None, width=800, height=600):
-	#slides[:0] = [(f, data, width, height)]
+	if data is None:
+		data = {}
+	if "desc" not in data:
+		data['desc'] = body_font
 	slides.append ((f, data, width, height))
 	return f
 
@@ -39,6 +46,7 @@ whois = 0
 def who(name):
 	global whois
 	whois = name
+
 # And convenience functions to add a slide.  Can be
 # used as a function decorator, or called directly.
 def slide_who(f, who, data=None):
@@ -48,45 +56,28 @@ def slide_who(f, who, data=None):
 		data = {}
 	data['who'] = who
 	return slide_add (f, data)
+
 def slide(f, data=None):
 	return slide_who (f, whois, data=data)
-def slide_noone(f, data=None):
+
+def slide_heading(f, data=None):
+	if data is None:
+		data = {}
+	if 'desc' not in data:
+		data['desc'] = head_font
 	if data and 'who' in data:
 		return slide_who (f, data['who'], data=data)
 	else:
 		return slide_who (f, 0, data=data)
 
-#
-# Slides start here
-#
-
-who (behdad)
-
-@slide
-def title_slide (r):
-	r.move_to (400, 250)
-	r.put_text ("<b>FontTools</b>\n"+
-		    "<span font_desc='30'>"+
-		    "reviving an Open Source project &amp;\n"+
-		    "<span strikethrough='true'>re</span>building a thriving community"+
-		    "</span>", valign=0, halign=0, desc="100")
-
-	r.move_to (400, 550)
-	r.put_text ("""Behdad Esfahbod\n<span font_desc="monospace 16">behdad@google.com\nhttp://behdad.org</span>""",
-		    desc="20", halign=0, valign=-1)
-
-def list_slide (l, data=None):
+def bullet_list_slide (title, items):
 	def s (r):
-		return '\n'.join (l)
-		#yield l[0]
-		#for i in l[1:]:
-		#	yield '\n'+i
-	s.__name__ = l[0]
+		ts = "<span font_desc='"+head_font+"'>"+title+"</span>\n"
+		return ts + '\n'.join ("• " + item for item in items)
+	s.__name__ = title
+	data={'desc': body_font, 'align': pango.ALIGN_LEFT}
 	slide (s, data)
 
-slide_noone("History")
-slide_noone("Where")
-
 def image_slide (f, width=600, height=600, imgwidth=0, imgheight=0, xoffset=0, yoffset=0, data=None):
 	def s (r):
 		r.move_to (400+xoffset, 300+yoffset)
@@ -105,33 +96,16 @@ def draw_image (r, f, width=600, height=600, imgwidth=0, imgheight=0, xoffset=0,
 	y = (600 - height) * .5
 	r.set_allocation (x, y, width, height)
 
-slide_noone("<b>Demo\ntime!</b>")
-
-# Demo!
-
-slide_noone("<b>Limitations</b>")
-slide("Memory\nfootprint")
-slide("Speed+memory\nfont-dependent")
-
-slide_noone("<b>Advantages</b>")
-slide("Memory\nfootprint")
-slide("Subpixel\npositioning")
-slide("Pinch-to-zoom")
-
-list_slide ([
-		"<b>Challenges</b>",
-		"• Shader size / complexity",
-		"• Pixel cost",
-		"• Conditionals",
-		"• Dependent texture lookups",
-		"• Variable loop iterations",
-		"• Interpolation accuracy",
-	    ], data={'align': pango.ALIGN_LEFT})
-
-def source_slide(s, lang="python"):
+def source_slide(s, lang):
 	s = highlight(s, lang)
 	s = "<span font_desc='monospace'>" + s + "</span>"
-	slide_noone (s, data={'align': pango.ALIGN_LEFT})
+	slide_heading (s, data={'align': pango.ALIGN_LEFT})
+
+def python_slide(s):
+	source_slide(s, lang="py")
+
+def xml_slide(s):
+	source_slide(s, lang="xml")
 
 def patch_slide(s):
 	lines = s.split ("\n")
@@ -150,7 +124,7 @@ def patch_slide(s):
 
 	s = '\n'.join (new_lines)
 	s = "<span font_desc='monospace'>" + s + "</span>"
-	slide_noone (s, data={'align': pango.ALIGN_LEFT})
+	slide_heading (s, data={'align': pango.ALIGN_LEFT})
 
 def commit_slide(s, who=None):
 	lines = s.split ("\n")
@@ -166,31 +140,321 @@ def commit_slide(s, who=None):
 	s = '\n'.join (new_lines)
 	s = "<span font_desc='monospace'>" + s + "</span>"
 	if who:
-		slide_noone (s, data={'align': pango.ALIGN_LEFT, 'who': who})
+		slide_heading (s, data={'align': pango.ALIGN_LEFT, 'who': who})
 	else:
-		slide_noone (s, data={'align': pango.ALIGN_LEFT})
-
-list_slide ([
-		"<b>Code: libglyphy</b>",
-		"• ~400 lines *.h",
-		"• ~2500 lines *.cc *.hh",
-		"• ~370 lines *.glsl",
-		"• No dependencies",
-	    ], data={'align': pango.ALIGN_LEFT})
-list_slide ([
-		"<b>Code: glyphy-demo</b>",
-		"• ~2800 lines *.cc *.h",
-		"• ~150 lines *.glsl",
-		"• FreeType, GLUT",
-	    ], data={'align': pango.ALIGN_LEFT})
-list_slide ([
-		"<b>More work</b>",
-		"• Subpixel-rendering",
-		"• Anisotropic-antialiasing",
-	    ], data={'align': pango.ALIGN_LEFT})
-
-slide("<b>Gallery!</b>")
-slide("<b>Q?</b>")
+		slide_heading (s, data={'align': pango.ALIGN_LEFT})
+
+
+#
+# Slides start here
+#
+
+who (behdad)
+
+@slide
+def title_slide (r):
+	r.move_to (400, 250)
+	r.put_text ("<span font_desc='"+title_font+" bold'>FontTools</span>\n"+
+		    "<span font_desc='"+head_font+" 30'>"+
+		    "reviving an Open Source project,\n"+
+		    "<span strikethrough='true'>re</span>building a thriving community"+
+		    "</span>", valign=0, halign=0, desc=title_font+" 100")
+
+	r.move_to (400, 550)
+	r.put_text ("""Behdad Esfahbod""", desc=body_font+" 20", halign=0, valign=-1)
+
+bullet_list_slide("History", [
+	"Started in 1999ish",
+	"by Just van Rossum",
+	"of LettError fame",
+	"Slowed down by 2004",
+	"I picked it up last year"])
+bullet_list_slide("What is it?", [
+	"Two things: TTX and fontTools",
+	"TTX converts fonts to XML and back",
+	"fontTools is a Python library",
+	"Font engineer's calculator",
+	"Closely reflecting OpenType tables",
+	"Minimum abstractions"])
+
+slide_heading("TTX")
+xml_slide("""
+<?xml version="1.0" encoding="utf-8"?>
+<ttFont sfntVersion="\\x00\\x01\\x00\\x00" ttLibVersion="2.5">
+
+  <GlyphOrder>
+    <!-- The 'id' attribute is only for humans; it is ignored when parsed. -->
+    <GlyphID id="0" name=".notdef"/>
+    <GlyphID id="1" name="T"/>
+    <GlyphID id="2" name="X"/>
+  </GlyphOrder>
+
+  <head>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="1.0"/>
+    <fontRevision value="1.001"/>
+    <checkSumAdjustment value="0x22ff1f02"/>
+    <magicNumber value="0x5f0f3cf5"/>
+    <flags value="00000000 00001011"/>
+    <unitsPerEm value="1000"/>
+    ...
+  </head>
+
+  <hhea>
+    <tableVersion value="1.0"/>
+    <ascent value="863"/>
+    <descent value="-228"/>
+    <lineGap value="0"/>
+    ...
+  </hhea>
+""")
+xml_slide("""
+  <maxp>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="0x10000"/>
+    <numGlyphs value="3"/>
+    <maxPoints value="68"/>
+    <maxContours value="7"/>
+    ...
+  </maxp>
+
+  <OS_2>
+    <version value="3"/>
+    <xAvgCharWidth value="560"/>
+    <usWeightClass value="400"/>
+    <usWidthClass value="5"/>
+    <fsType value="00000000 00000000"/>
+    ...
+  </OS_2>
+""")
+xml_slide("""
+  <hmtx>
+    <mtx name=".notdef" width="260" lsb="0"/>
+    <mtx name="T" width="576" lsb="22"/>
+    <mtx name="X" width="584" lsb="26"/>
+  </hmtx>
+
+  <cmap>
+    <tableVersion version="0"/>
+    <cmap_format_4 platformID="3" platEncID="1" language="0">
+      <map code="0x54" name="T"/><!-- LATIN CAPITAL LETTER T -->
+      <map code="0x58" name="X"/><!-- LATIN CAPITAL LETTER X -->
+    </cmap_format_4>
+  </cmap>
+
+  <loca>
+    <!-- The 'loca' table will be calculated by the compiler -->
+  </loca>
+""")
+xml_slide("""
+  <glyf>
+
+    <!-- The xMin, yMin, xMax and yMax values
+         will be recalculated by the compiler. -->
+
+    <TTGlyph name=".notdef"/><!-- contains no outline data -->
+
+    <TTGlyph name="T" xMin="22" yMin="0" xMax="554" yMax="715">
+      <contour>
+        <pt x="264" y="673" on="1"/>
+        <pt x="22" y="673" on="1"/>
+        <pt x="22" y="715" on="1"/>
+        <pt x="554" y="715" on="1"/>
+        <pt x="554" y="673" on="1"/>
+        <pt x="312" y="673" on="1"/>
+        <pt x="312" y="0" on="1"/>
+        <pt x="264" y="0" on="1"/>
+      </contour>
+      <instructions><assembly>
+        </assembly></instructions>
+    </TTGlyph>
+
+    <TTGlyph name="X" xMin="26" yMin="0" xMax="558" yMax="715">
+      ...
+    </TTGlyph>
+
+  </glyf>
+""")
+xml_slide("""
+  <name>
+    <namerecord nameID="1" platformID="3" platEncID="1" langID="0x409">
+      Julius Sans One
+    </namerecord>
+    <namerecord nameID="2" platformID="3" platEncID="1" langID="0x409">
+      Regular
+    </namerecord>
+  </name>
+
+  <post>
+    <formatType value="3.0"/>
+    <italicAngle value="0.0"/>
+    <underlinePosition value="-75"/>
+    <underlineThickness value="50"/>
+    <isFixedPitch value="0"/>
+    <minMemType42 value="0"/>
+    <maxMemType42 value="0"/>
+    <minMemType1 value="0"/>
+    <maxMemType1 value="0"/>
+  </post>
+
+</ttFont>
+""")
+
+slide_heading("fontTools")
+bullet_list_slide("<span font_desc='monospace' foreground='#080'>from <span foreground='#00f'><b>fontTools</b></span> import</span>", [
+	"afmLib",
+	"cffLib",
+	"<span strikethrough='true'>fondLib</span>",
+	"<span strikethrough='true'>nfntLib</span>",
+	"t1Lib",
+	"<b>ttLib</b>",
+	])
+python_slide(open("snippets/unencoded.py").read())
+python_slide("""
+set(['A.salt',
+     'B.salt',
+     'E.salt',
+     'E_x',
+     'F_i',
+     'N.salt',
+     'NULL',
+     'T_h',
+     'T_i',
+     'a.end',
+     ...
+     'y_z'])
+""")
+
+bullet_list_slide("Framework", [
+	"Compiler / decompiler",
+	"XML serialization",
+	"Optimizer",
+	"Library",
+	"A tool to build products with",
+	"Not an end product",
+])
+bullet_list_slide("Philosophy", [
+	"Minimal abstraction",
+	"Hide byte layout, redundancy, etc",
+	"Platform to build on",
+])
+bullet_list_slide("Why?", [
+	"Free Software",
+	"Python (2.7+ &amp; 3.x)",
+	"Portable",
+	"No dependencies",
+	"Non-destructive",
+	"Batch-friendly",
+])
+bullet_list_slide("What for?", [
+	"Figuring out what's inside a font",
+	"Diff'ing font versions",
+	"Final steps of producing fonts",
+	"Hotfixing existing fonts",
+	"Reporting and analysis over <i>many</i> fonts",
+	"Server-side reporting and manipulation",
+	"Readable VCS-friendly font source code",
+	"Subsetting and merging fonts",
+])
+bullet_list_slide("Hotfixing", [
+	"XML and back",
+	"Python recipes",
+	"Interactive Python",
+])
+python_slide(open("snippets/drop_glyphnames.py").read())
+python_slide(open("snippets/rename_glyphs.py").read())
+
+bullet_list_slide("New work", [
+	"Bitmap tables, color tables, misc tables",
+	"WOFF1 read and write",
+	"More stable XML format",
+	"More optimized font files",
+	"Bug fixes; many of them",
+	"Major speed-up",
+	"New tools",
+])
+
+bullet_list_slide("Tools", [
+	"pyftsubset",
+	"pyftmerge",
+	"pyftinspect",
+])
+bullet_list_slide("pyftsubset", [
+	"OpenType font subsetter &amp; optimizer",
+	"TrueType and CFF flavored",
+	"SFNT and WOFF1",
+	"Full OpenType Layout support",
+	"File-size optimizations",
+	"Designed for webfont productions",
+	"Used for sub-family instantiation",
+])
+source_slide(open("snippets/subsetting.txt").read(), "text")
+bullet_list_slide("pyftmerge", [
+	"Font merging tool",
+	"Very early prototype",
+	"Fonts having same format, upem",
+	"TrueType-flavored only",
+	"Retains hinting from one font",
+	"Handles conflicting characters",
+	"Designed for Noto",
+	"Used for merging Latin and non-Latin",
+])
+source_slide(open("snippets/merging.txt").read(), "text")
+
+# 1. Feel free to mention in your talk Yannis Haralambous' book "Fonts & Encodings" [1], simply because it can be seen as a "user manual for TTX". It talks extensively about the various SFNT tables, and illustrates them using TTX XML structures. So, while fontTools itself has very lacking documentation*, the book is actually a great companion. When I read the book and I look at the .ttx XML representation of a font, I have good chances to actually understand how it all works. 
+
+slide_heading("FontTools")
+bullet_list_slide("Strengths", [
+	"Supports wide array of tables",
+	"Low-level, non-destructive",
+	"Python",
+	"Self-documenting",
+	"Optimized output",
+	"Extensible",
+	"Supports all color tables",
+])
+bullet_list_slide("Weaknesses", [
+	"Supports wide array of tables",
+	"Low-level, non-destructive",
+	"Python",
+	"Undocumented",
+	"Always optimizes output",
+	"Not well-extensible",
+	"Supports many legacy tables",
+])
+bullet_list_slide("Users", [
+	"Google Fonts; misc foundries",
+	"Font Bakery, AFDKO, etc",
+	"Adam Twardoch; others",
+	"...",
+])
+bullet_list_slide("Community", [
+	"https://github.com/behdad/fonttools/",
+	"https://groups.google.com/forum/#!forum/fonttools",
+	"http://sourceforge.net/projects/fonttools/",
+])
+
+bullet_list_slide("Future work", [
+	"More font optimization",
+	"Better input: .fea / UFO",
+	"Lint tool",
+	"TrueType / CFF conversion",
+	"Subsetting more tables",
+	"Better merging",
+])
+bullet_list_slide("Future work: optimization", [
+	"Optimal packing: glyf flags / PUSH / etc",
+	"CFF outline operation specializer",
+	"CFF subroutinizer",
+	"TrueType outline optimizer? (fontcrunch)",
+	"TrueType bytecode analysis",
+	"UPEM reduction",
+])
+
+slide("<b>Q?</b>", data={"desc":title_font})
+python_slide('')
+
+xml_slide(open("snippets/tofu.ttx").read())
 
 if __name__ == "__main__":
 	import slippy
diff --git a/fonttools/fonttools_theme.py b/fonttools/fonttools_theme.py
index 5c5bbf3..078c9de 100644
--- a/fonttools/fonttools_theme.py
+++ b/fonttools/fonttools_theme.py
@@ -20,7 +20,7 @@ import cairo
 
 avatar_margin = .10
 logo_margin = .01
-footer_margin = .04
+footer_margin = .05
 padding = .000
 bubble_rad = .25
 
@@ -76,7 +76,7 @@ def prepare_page (renderer):
 	cr.move_to (.5 * width, height-p2)
 	b = 150.
 	cr.set_source_rgb (0x9b/b, 0x84/b, 0x66/b)
-	renderer.put_text ("ATypI Barcelona, 17 September 2014", height=f-p2, valign=-1, desc="bold")
+	renderer.put_text ("ATypI Barcelona, 17 September 2014", height=f-p2, valign=-1, desc="cinzel")
 
 	# Cartoon icons for speakers
 	who = renderer.data.get ('who', None)
@@ -135,7 +135,7 @@ def draw_bubble (renderer, x, y, w, h, data={}):
 	cr.restore ()
 
 	cr.clip ()
-	cr.set_source_rgba (1, 1, 1, .95)
+	cr.set_source_rgba (1, 1, 1, .94)
 	cr.paint ()
 
 	b = 700.
diff --git a/fonttools/snippets/drop_glyphnames.py b/fonttools/snippets/drop_glyphnames.py
new file mode 100644
index 0000000..46fcb99
--- /dev/null
+++ b/fonttools/snippets/drop_glyphnames.py
@@ -0,0 +1,8 @@
+import fontTools.ttLib
+
+font = fontTools.ttLib.TTFont(inpath)
+post = font['post']
+
+post.fomratType = 3.0
+
+font.save(outpath)
diff --git a/fonttools/snippets/merging.txt b/fonttools/snippets/merging.txt
new file mode 100644
index 0000000..20426b8
--- /dev/null
+++ b/fonttools/snippets/merging.txt
@@ -0,0 +1,11 @@
+$ pyftmerge NotoSansDevanagari-Regular.ttf NotoSansBengali-Regular.ttf
+$ ls -l
+-rw-r--r-- 1 behdad eng 266580 Sep 17 08:19 merged.ttf
+-rw-r--r-- 1 behdad eng 188664 Sep 17 08:18 NotoSansBengali-Regular.ttf
+-rw-r--r-- 1 behdad eng 177672 Sep 17 08:18 NotoSansDevanagari-Regular.ttf
+
+$ pyftmerge NotoSansBengali-Regular.ttf NotoSansDevanagari-Regular.ttf
+$ ls -l
+-rw-r--r-- 1 behdad eng 293276 Sep 17 08:21 merged.ttf
+-rw-r--r-- 1 behdad eng 188664 Sep 17 08:18 NotoSansBengali-Regular.ttf
+-rw-r--r-- 1 behdad eng 177672 Sep 17 08:18 NotoSansDevanagari-Regular.ttf
diff --git a/fonttools/snippets/rename_glyphs.py b/fonttools/snippets/rename_glyphs.py
new file mode 100644
index 0000000..2c88a74
--- /dev/null
+++ b/fonttools/snippets/rename_glyphs.py
@@ -0,0 +1,12 @@
+import fontTools.ttLib
+
+font = fontTools.ttLib.TTFont(inpath)
+glyphnames = font.getGlyphOrder()
+
+# ...do the actual renaming in glyphnames...
+
+font = fontTools.ttLib.TTFont(inpath) # load again
+font.setGlyphOrder(glyphnames)
+post = font['post'] # make sure post table is loaded
+
+font.save(outpath)
diff --git a/fonttools/snippets/subsetting.txt b/fonttools/snippets/subsetting.txt
new file mode 100644
index 0000000..767c238
--- /dev/null
+++ b/fonttools/snippets/subsetting.txt
@@ -0,0 +1,32 @@
+$ pyftsubset Lobster.ttf --text=Lobster --glyph-names --verbose
+Text: 'Lobster'
+Unicodes: []
+Glyphs: []
+Gids: []
+cmap pruned
+glyf pruned
+...
+Added gid0 to subset
+Closing glyph list over 'GSUB': 8 glyphs before
+Glyph names: ['.notdef', 'L', 'b', 'e', 'o', 'r', 's', 't']
+Closed  glyph list over 'GSUB': 16 glyphs after
+Glyph names: ['.notdef', 'L', 'b', 'b_s', 'b_s.end', 'e', 'e.end', 'o',
+              'o.end', 'o_s', 'o_s.end', 'r', 's', 's.end', 't', 't.end']
+Retaining 16 glyphs: 
+head subsetting not needed
+...
+hmtx subsetted
+cmap subsetted
+glyf subsetted
+kern subsetted to empty; dropped
+name subsetting not needed
+GDEF subsetted
+GPOS subsetted
+GSUB subsetted
+...
+glyf pruned
+GDEF pruned
+GPOS pruned
+GSUB pruned
+Input  font: 140856 bytes: Lobster.ttf
+Subset font:   4648 bytes: Lobster.ttf.subset
diff --git a/fonttools/snippets/tofu.ttx b/fonttools/snippets/tofu.ttx
new file mode 100644
index 0000000..f94f414
--- /dev/null
+++ b/fonttools/snippets/tofu.ttx
@@ -0,0 +1,16 @@
+  <cmap raw="1">
+    <!-- Hand-coded format13 table mapping all Unicode
+         characters to glyph00001. -->
+    <hexdata>
+      0000 0001 <!-- version numTables -->
+        0003 000A <!-- platformID encodingID -->
+        0000000C  <!-- offset -->
+          000D 0000 <!-- format reserved -->
+          0000001C  <!-- length -->
+          00000000  <!-- language -->
+          00000001  <!-- nGroups -->
+            00000001  <!-- startCharCode -->
+            0010FFFE  <!-- endCharCode -->
+            00000001  <!-- glyphID -->
+    </hexdata>
+  </cmap>
diff --git a/fonttools/snippets/ttx.ttx b/fonttools/snippets/ttx.ttx
new file mode 100644
index 0000000..0c7520a
--- /dev/null
+++ b/fonttools/snippets/ttx.ttx
@@ -0,0 +1,204 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ttFont sfntVersion="\x00\x01\x00\x00" ttLibVersion="2.5">
+
+  <GlyphOrder>
+    <!-- The 'id' attribute is only for humans; it is ignored when parsed. -->
+    <GlyphID id="0" name=".notdef"/>
+    <GlyphID id="1" name="T"/>
+    <GlyphID id="2" name="X"/>
+  </GlyphOrder>
+
+  <head>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="1.0"/>
+    <fontRevision value="1.001"/>
+    <checkSumAdjustment value="0x22ff1f02"/>
+    <magicNumber value="0x5f0f3cf5"/>
+    <flags value="00000000 00001011"/>
+    <unitsPerEm value="1000"/>
+    <created value="Sat Oct  6 04:04:08 2012"/>
+    <modified value="Sat Oct  6 04:04:08 2012"/>
+    <xMin value="-44"/>
+    <yMin value="-228"/>
+    <xMax value="1469"/>
+    <yMax value="863"/>
+    <macStyle value="00000000 00000000"/>
+    <lowestRecPPEM value="8"/>
+    <fontDirectionHint value="2"/>
+    <indexToLocFormat value="0"/>
+    <glyphDataFormat value="0"/>
+  </head>
+
+  <hhea>
+    <tableVersion value="1.0"/>
+    <ascent value="863"/>
+    <descent value="-228"/>
+    <lineGap value="0"/>
+    <advanceWidthMax value="1059"/>
+    <minLeftSideBearing value="-44"/>
+    <minRightSideBearing value="-586"/>
+    <xMaxExtent value="1469"/>
+    <caretSlopeRise value="1"/>
+    <caretSlopeRun value="0"/>
+    <caretOffset value="0"/>
+    <reserved0 value="0"/>
+    <reserved1 value="0"/>
+    <reserved2 value="0"/>
+    <reserved3 value="0"/>
+    <metricDataFormat value="0"/>
+    <numberOfHMetrics value="3"/>
+  </hhea>
+
+  <maxp>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="0x10000"/>
+    <numGlyphs value="3"/>
+    <maxPoints value="68"/>
+    <maxContours value="7"/>
+    <maxCompositePoints value="0"/>
+    <maxCompositeContours value="0"/>
+    <maxZones value="2"/>
+    <maxTwilightPoints value="0"/>
+    <maxStorage value="1"/>
+    <maxFunctionDefs value="1"/>
+    <maxInstructionDefs value="0"/>
+    <maxStackElements value="64"/>
+    <maxSizeOfInstructions value="0"/>
+    <maxComponentElements value="0"/>
+    <maxComponentDepth value="0"/>
+  </maxp>
+
+  <OS_2>
+    <version value="3"/>
+    <xAvgCharWidth value="560"/>
+    <usWeightClass value="400"/>
+    <usWidthClass value="5"/>
+    <fsType value="00000000 00000000"/>
+    <ySubscriptXSize value="650"/>
+    <ySubscriptYSize value="600"/>
+    <ySubscriptXOffset value="0"/>
+    <ySubscriptYOffset value="75"/>
+    <ySuperscriptXSize value="650"/>
+    <ySuperscriptYSize value="600"/>
+    <ySuperscriptXOffset value="0"/>
+    <ySuperscriptYOffset value="350"/>
+    <yStrikeoutSize value="50"/>
+    <yStrikeoutPosition value="298"/>
+    <sFamilyClass value="0"/>
+    <panose>
+      <bFamilyType value="2"/>
+      <bSerifStyle value="0"/>
+      <bWeight value="0"/>
+      <bProportion value="0"/>
+      <bContrast value="0"/>
+      <bStrokeVariation value="0"/>
+      <bArmStyle value="0"/>
+      <bLetterForm value="0"/>
+      <bMidline value="0"/>
+      <bXHeight value="0"/>
+    </panose>
+    <ulUnicodeRange1 value="10000000 00000000 00000000 00101111"/>
+    <ulUnicodeRange2 value="01000000 00000000 00000000 01001010"/>
+    <ulUnicodeRange3 value="00000000 00000000 00000000 00000000"/>
+    <ulUnicodeRange4 value="00000000 00000000 00000000 00000000"/>
+    <achVendID value="T26\x00"/>
+    <fsSelection value="00000000 01000000"/>
+    <fsFirstCharIndex value="32"/>
+    <fsLastCharIndex value="64258"/>
+    <sTypoAscender value="863"/>
+    <sTypoDescender value="-228"/>
+    <sTypoLineGap value="0"/>
+    <usWinAscent value="863"/>
+    <usWinDescent value="228"/>
+    <ulCodePageRange1 value="00100000 00000000 00000000 00000001"/>
+    <ulCodePageRange2 value="00000000 00000000 00000000 00000000"/>
+    <sxHeight value="649"/>
+    <sCapHeight value="715"/>
+    <usDefaultChar value="0"/>
+    <usBreakChar value="32"/>
+    <usMaxContex value="2"/>
+  </OS_2>
+
+  <hmtx>
+    <mtx name=".notdef" width="260" lsb="0"/>
+    <mtx name="T" width="576" lsb="22"/>
+    <mtx name="X" width="584" lsb="26"/>
+  </hmtx>
+
+  <cmap>
+    <tableVersion version="0"/>
+    <cmap_format_4 platformID="3" platEncID="1" language="0">
+      <map code="0x54" name="T"/><!-- LATIN CAPITAL LETTER T -->
+      <map code="0x58" name="X"/><!-- LATIN CAPITAL LETTER X -->
+    </cmap_format_4>
+  </cmap>
+
+  <loca>
+    <!-- The 'loca' table will be calculated by the compiler -->
+  </loca>
+
+  <glyf>
+
+    <!-- The xMin, yMin, xMax and yMax values
+         will be recalculated by the compiler. -->
+
+    <TTGlyph name=".notdef"/><!-- contains no outline data -->
+
+    <TTGlyph name="T" xMin="22" yMin="0" xMax="554" yMax="715">
+      <contour>
+        <pt x="264" y="673" on="1"/>
+        <pt x="22" y="673" on="1"/>
+        <pt x="22" y="715" on="1"/>
+        <pt x="554" y="715" on="1"/>
+        <pt x="554" y="673" on="1"/>
+        <pt x="312" y="673" on="1"/>
+        <pt x="312" y="0" on="1"/>
+        <pt x="264" y="0" on="1"/>
+      </contour>
+      <instructions><assembly>
+        </assembly></instructions>
+    </TTGlyph>
+
+    <TTGlyph name="X" xMin="26" yMin="0" xMax="558" yMax="715">
+      <contour>
+        <pt x="53" y="715" on="1"/>
+        <pt x="112" y="715" on="1"/>
+        <pt x="304" y="401" on="1"/>
+        <pt x="504" y="715" on="1"/>
+        <pt x="557" y="715" on="1"/>
+        <pt x="327" y="364" on="1"/>
+        <pt x="558" y="0" on="1"/>
+        <pt x="500" y="0" on="1"/>
+        <pt x="294" y="332" on="1"/>
+        <pt x="79" y="0" on="1"/>
+        <pt x="26" y="0" on="1"/>
+        <pt x="270" y="370" on="1"/>
+      </contour>
+      <instructions><assembly>
+        </assembly></instructions>
+    </TTGlyph>
+
+  </glyf>
+
+  <name>
+    <namerecord nameID="1" platformID="3" platEncID="1" langID="0x409">
+      Julius Sans One
+    </namerecord>
+    <namerecord nameID="2" platformID="3" platEncID="1" langID="0x409">
+      Regular
+    </namerecord>
+  </name>
+
+  <post>
+    <formatType value="3.0"/>
+    <italicAngle value="0.0"/>
+    <underlinePosition value="-75"/>
+    <underlineThickness value="50"/>
+    <isFixedPitch value="0"/>
+    <minMemType42 value="0"/>
+    <maxMemType42 value="0"/>
+    <minMemType1 value="0"/>
+    <maxMemType1 value="0"/>
+  </post>
+
+</ttFont>
diff --git a/fonttools/snippets/unencoded.py b/fonttools/snippets/unencoded.py
new file mode 100644
index 0000000..a2c678e
--- /dev/null
+++ b/fonttools/snippets/unencoded.py
@@ -0,0 +1,12 @@
+import fontTools.ttLib
+
+font = fontTools.ttLib.TTFont("Lobster.ttf")
+cmap = font['cmap']
+
+encoded = set()
+for subtable in cmap.tables:
+	encoded.update(subtable.cmap.values())
+unencoded = set(font.getGlyphOrder()).difference(encoded)
+
+import pprint
+pprint.pprint(unencoded)
diff --git a/pangopygments.py b/pangopygments.py
index 413f629..b9823c9 100644
--- a/pangopygments.py
+++ b/pangopygments.py
@@ -70,6 +70,7 @@ __LEXERS = {
     'py': lexers.PythonLexer,
     'scala': lexers.ScalaLexer,
     'glsl': lexers.GLShaderLexer,
+    'xml': lexers.XmlLexer,
     }
 
 def highlight(snippet, lang):
@@ -81,11 +82,11 @@ def highlight(snippet, lang):
 
   # Pygments messes up initial and final newlines; fix up
   begin = ''
-  if snippet[0] == '\n':
+  if snippet[:1] == '\n':
 	  begin = '\n'
 	  snippet = snippet[1:]
   end = ''
-  if snippet[-1] == '\n':
+  if snippet[-1:] == '\n':
 	  end = '\n'
 	  snippet = snippet[:-1]
 
@@ -94,8 +95,8 @@ def highlight(snippet, lang):
   else:
     print("Language %s is not supported." % lang)
 
-  if snippet[0] == '\n' and start == '\n':
-	  start = ''
+  if snippet[0] == '\n' and begin == '\n':
+	  begin = ''
   if snippet[-1] == '\n' and end == '\n':
 	  end = ''
 
diff --git a/slippy.py b/slippy.py
index b036b1e..71cbfe3 100755
--- a/slippy.py
+++ b/slippy.py
@@ -441,6 +441,7 @@ class Slide:
 
 		layout = renderer.create_layout (self.text)
 		layout.set_alignment (self.data.get ('align', pango.ALIGN_CENTER))
+		layout.set_font_description (pango.FontDescription(self.data.get ('desc', "Sans")))
 		lw, lh = renderer.fit_layout (layout, w, h)
 
 		ext = self.extents