Port glyf transform from numpy to lists

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/fontTools/misc/arrayTools.py b/Lib/fontTools/misc/arrayTools.py
index 3f39e7e4..58cac006 100644
--- a/Lib/fontTools/misc/arrayTools.py
+++ b/Lib/fontTools/misc/arrayTools.py
@@ -6,6 +6,13 @@
 
 import math
 
+def matMult(a,b):
+    """Returns the matrix multiplication of two matrices. Matrices
+    are represented as lists of lists, row-major."""
+    r1 = range(len(a[0]))
+    r2 = range(len(b[0]))
+    return [[sum(r[i]*b[i][j] for i in r1) for j in r2] for r in a]
+
 def calcBounds(array):
     """Return the bounding rectangle of a 2D points array as a tuple:
     (xMin, yMin, xMax, yMax)