Deterministic LaTeX text in SVG images

lib/matplotlib/tests/test_backend_svg.py

@@ -119,14 +119,15 @@ def test_bold_font_output_with_none_fonttype():
     ax.set_title('bold-title', fontweight='bold')
 
 
-def _test_determinism(filename):
+def _test_determinism_save(filename, usetex):
     # This function is mostly copy&paste from "def test_visibility"
     # To require no GUI, we use Figure and FigureCanvasSVG
     # instead of plt.figure and fig.savefig
     from matplotlib.figure import Figure
     from matplotlib.backends.backend_svg import FigureCanvasSVG
     from matplotlib import rc
     rc('svg', hashsalt='asdf')
+    rc('text', usetex=usetex)
 
     fig = Figure()
     ax = fig.add_subplot(111)
@@ -138,12 +139,14 @@ def _test_determinism(filename):
     a, b, c = ax.errorbar(x, y, yerr=yerr, fmt='ko')
     for artist in b:
         artist.set_visible(False)
+    ax.set_title('A string $1+2+\sigma$')
+    ax.set_xlabel('A string $1+2+\sigma$')
+    ax.set_ylabel('A string $1+2+\sigma$')
 
     FigureCanvasSVG(fig).print_svg(filename)
 
 
-@cleanup
-def test_determinism():
+def _test_determinism(filename, usetex):
     import os
     import sys
     from subprocess import check_call
@@ -154,15 +157,27 @@ def test_determinism():
                     'import matplotlib; '
                     'matplotlib.use("svg"); '
                     'from matplotlib.tests.test_backend_svg '
-                    'import _test_determinism;'
-                    '_test_determinism("determinism.svg")'])
-        with open('determinism.svg', 'rb') as fd:
+                    'import _test_determinism_save;'
+                    '_test_determinism_save(%r, %r)' % (filename, usetex)])
+        with open(filename, 'rb') as fd:
             plots.append(fd.read())
-        os.unlink('determinism.svg')
+        os.unlink(filename)
     for p in plots[1:]:
         assert_equal(p, plots[0])
 
 
+@cleanup
+def test_determinism_notex():
+    # unique filename to allow for parallel testing
+    _test_determinism('determinism_notex.svg', usetex=False)
+
+
+@cleanup
+def test_determinism_tex():
+    # unique filename to allow for parallel testing
+    _test_determinism('determinism_tex.svg', usetex=True)
+
+
 if __name__ == '__main__':
     import nose
     nose.runmodule(argv=['-s', '--with-doctest'], exit=False)

lib/matplotlib/textpath.py

@@ -182,7 +182,7 @@ def get_glyphs_with_font(self, font, s, glyph_map=None,
         glyph_ids = []
 
         if glyph_map is None:
-            glyph_map = dict()
+            glyph_map = OrderedDict()
 
         if return_new_glyphs_only:
             glyph_map_new = OrderedDict()
@@ -241,10 +241,10 @@ def get_glyphs_mathtext(self, prop, s, glyph_map=None,
             s, self.DPI, prop)
 
         if not glyph_map:
-            glyph_map = dict()
+            glyph_map = OrderedDict()
 
         if return_new_glyphs_only:
-            glyph_map_new = dict()
+            glyph_map_new = OrderedDict()
         else:
             glyph_map_new = glyph_map
 
@@ -318,10 +318,10 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
             page = next(iter(dvi))
 
         if glyph_map is None:
-            glyph_map = dict()
+            glyph_map = OrderedDict()
 
         if return_new_glyphs_only:
-            glyph_map_new = dict()
+            glyph_map_new = OrderedDict()
         else:
             glyph_map_new = glyph_map