1 files changed, 135 insertions, 0 deletions
diff --git a/lib/silfont/ipython.py b/lib/silfont/ipython.py
new file mode 100644
index 0000000..150aa97
--- /dev/null
+++ b/lib/silfont/ipython.py
@@ -0,0 +1,135 @@
+#!/usr/bin/python
+'IPython support for fonttools'
+
+__all__ = ['displayGlyphs', 'loadFont', 'displayText', 'displayRaw']
+
+from fontTools import ttLib
+from fontTools.pens.basePen import BasePen
+from fontTools.misc import arrayTools
+from IPython.display import SVG, HTML
+from defcon import Font
+from ufo2ft import compileTTF
+
+class SVGPen(BasePen) :
+
+    def __init__(self, glyphSet, scale=1.0) :
+        super(SVGPen, self).__init__(glyphSet);
+        self.__commands = []
+        self.__scale = scale
+
+    def __str__(self) :
+        return " ".join(self.__commands)
+
+    def scale(self, pt) :
+        return ((pt[0] or 0) * self.__scale, (pt[1] or 0) * self.__scale)
+
+    def _moveTo(self, pt):
+        self.__commands.append("M {0[0]} {0[1]}".format(self.scale(pt)))
+
+    def _lineTo(self, pt):
+        self.__commands.append("L {0[0]} {0[1]}".format(self.scale(pt)))
+
+    def _curveToOne(self, pt1, pt2, pt3) :
+        self.__commands.append("C {0[0]} {0[1]} {1[0]} {1[1]} {2[0]} {2[1]}".format(self.scale(pt1), self.scale(pt2), self.scale(pt3)))
+
+    def _closePath(self) :
+        self.__commands.append("Z")
+
+    def clear(self) :
+        self.__commands = []
+
+def _svgheader():
+    return '''<?xml version="1.0"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
+'''
+
+def _bbox(f, gnames, points, scale=1):
+    gset = f.glyphSet
+    bbox = (0, 0, 0, 0)
+    for i, gname in enumerate(gnames):
+        if hasattr(points, '__len__') and i == len(points):
+            points.append((bbox[2] / scale, 0))
+        pt = points[i] if i < len(points) else (0, 0)
+        g = gset[gname]._glyph
+        if g is None or not hasattr(g, 'xMin') :
+            gbox = (0, 0, 0, 0)
+        else :
+            gbox = (g.xMin * scale, g.yMin * scale, g.xMax * scale, g.yMax * scale)
+        bbox = arrayTools.unionRect(bbox, arrayTools.offsetRect(gbox, pt[0] * scale, pt[1] * scale))
+    return bbox
+
+glyphsetcount = 0
+def _defglyphs(f, gnames, scale=1):
+    global glyphsetcount
+    glyphsetcount += 1
+    gset = f.glyphSet
+    p = SVGPen(gset, scale)
+    res = "<defs><g>\n"
+    for gname in sorted(set(gnames)):
+        res += '<symbol overflow="visible" id="{}_{}">\n'.format(gname, glyphsetcount)
+        g = gset[gname]
+        p.clear()
+        g.draw(p)
+        res += '<path style="stroke:none;" d="' + str(p) + '"/>\n</symbol>\n'
+    res += "</g></defs>\n"
+    return res
+
+def loadFont(fname):
+    if fname.lower().endswith(".ufo"):
+        ufo = Font(fname)
+        f = compileTTF(ufo)
+    else:
+        f = ttLib.TTFont(fname)
+    return f
+
+def displayGlyphs(f, gnames, points=None, scale=None):
+    if not hasattr(gnames, '__len__') or isinstance(gnames, basestring):
+        gnames = [gnames]
+    if not hasattr(points, '__len__'):
+        points = []
+    if not hasattr(f, 'glyphSet'):
+        f.glyphSet = f.getGlyphSet()
+    res = _svgheader()
+    if points is None:
+        points = []
+    bbox = _bbox(f, gnames, points, scale or 1)
+    maxh = 100.
+    height = bbox[3] - (bbox[1] if bbox[1] < 0 else 0)
+    if scale is None and height > maxh:
+        scale = maxh / height
+        bbox = [x  * scale for x in bbox]
+    res += _defglyphs(f, gnames, scale)
+    res += '<g id="surface1" transform="matrix(1,0,0,-1,{},{})">\n'.format(-bbox[0], bbox[3])
+    res += '  <rect x="{}" y="{}" width="{}" height="{}" style="fill:white;stroke:none"/>\n'.format(
+        bbox[0], bbox[1], bbox[2]-bbox[0], bbox[3])
+    res += '  <g style="fill:black">\n'
+    for i, gname in enumerate(gnames):
+        pt = points[i] if i < len(points) else (0, 0)
+        res += '    <use xlink:href="#{0}_{3}" x="{1}" y="{2}"/>\n'.format(gname, pt[0] * scale, pt[1] * scale, glyphsetcount)
+    res += '  </g></g>\n</svg>\n'
+    return SVG(data=res)
+    #return res
+
+def displayText(f, text, features = [], lang=None, dir="", script="", shapers="", size=0):
+    import harfbuzz
+    glyphs = harfbuzz.shape_text(f, text, features, lang, dir, script, shapers)
+    gnames = []
+    points = []
+    x = 0
+    y = 0
+    for g in glyphs:
+        gnames.append(f.getGlyphName(g.gid))
+        points.append((x+g.offset[0], y+g.offset[1]))
+        x += g.advance[0]
+        y += g.advance[1]
+    if size == 0:
+        scale = None
+    else:
+        upem = f['head'].unitsPerEm
+        scale = 4. * size / (upem * 3.)
+    return displayGlyphs(f, gnames, points, scale=scale)
+
+def displayRaw(text):
+    # res = "<html><body>"+text.encode('utf-8')+"</body></html>"
+    res = u"<html><body><p>"+text+u"</p></body></html>"
+    return HTML(data=res)