fontbuild: remove use of fontmake, simplifying things.

1 files changed, 86 insertions, 0 deletions

diff --git a/misc/fontbuildlib/glyph.py b/misc/fontbuildlib/glyph.py
new file mode 100644
index 000000000..734b881e0
--- /dev/null
+++ b/misc/fontbuildlib/glyph.py
@@ -0,0 +1,86 @@
+import re
+from fontTools.pens.transformPen import TransformPen
+from fontTools.misc.transform import Transform
+from fontTools.pens.reverseContourPen import ReverseContourPen
+
+# Directives are glyph-specific post-processing directives for the compiler.
+# A directive is added to the "note" section of a glyph and takes the
+# following form:
+#
+#   !post:DIRECTIVE
+#
+# Where DIRECTIVE is the name of a known directive.
+# This string can appear anywhere in the glyph note.
+# Directives are _not_ case sensitive but normalized by str.lower(), meaning
+# that e.g. "removeoverlap" == "RemoveOverlap" == "REMOVEOVERLAP".
+#
+knownDirectives = set([
+  'removeoverlap',  # applies overlap removal (boolean union)
+])
+
+
+_findDirectiveRegEx = re.compile(r'\!post:([^ ]+)', re.I | re.U)
+
+
+def findGlyphDirectives(string): # -> set<string> | None
+  directives = set()
+  if string and len(string) > 0:
+    for directive in _findDirectiveRegEx.findall(string):
+      directive = directive.lower()
+      if directive in knownDirectives:
+        directives.add(directive)
+      else:
+        print(
+          'unknown glyph directive !post:%s in glyph %s' % (directive, g.name),
+          file=sys.stderr
+        )
+  return directives
+
+
+
+def composedGlyphIsTrivial(g):
+  # A trivial glyph is one that does not use components or where component transformation
+  # does not include mirroring (i.e. "flipped").
+  if g.components and len(g.components) > 0:
+    for c in g.components:
+      # has non-trivial transformation? (i.e. scaled)
+      # Example of optimally trivial transformation:
+      #   (1, 0, 0, 1, 0, 0)  no scale or offset
+      # Example of scaled transformation matrix:
+      #   (-1.0, 0, 0.3311, 1, 1464.0, 0)  flipped x axis, sheered and offset
+      #
+      xScale = c.transformation[0]
+      yScale = c.transformation[3]
+      # If glyph is reflected along x or y axes, it won't slant well.
+      if xScale < 0 or yScale < 0:
+        return False
+  return True
+
+
+
+def decomposeGlyphs(ufos, glyphNamesToDecompose):
+  for ufo in ufos:
+    for glyphname in glyphNamesToDecompose:
+      glyph = ufo[glyphname]
+      _deepCopyContours(ufo, glyph, glyph, Transform())
+      glyph.clearComponents()
+
+
+
+def _deepCopyContours(ufo, parent, component, transformation):
+  """Copy contours from component to parent, including nested components."""
+  for nested in component.components:
+    _deepCopyContours(
+      ufo,
+      parent,
+      ufo[nested.baseGlyph],
+      transformation.transform(nested.transformation)
+    )
+  if component != parent:
+    pen = TransformPen(parent.getPen(), transformation)
+    # if the transformation has a negative determinant, it will reverse
+    # the contour direction of the component
+    xx, xy, yx, yy = transformation[:4]
+    if xx*yy - xy*yx < 0:
+      pen = ReverseContourPen(pen)
+    component.draw(pen)
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