Do not distill and embed fonts if no text

oscargus · oscargus · commit 61a4058ee254 · 2022-08-31T10:21:03.000+02:00
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -1063,6 +1063,13 @@ def _print_figure_tex(
 """,
                 encoding="latin-1")
 
+            if len(ps_renderer.psfrag) == 0:
+                # No text, so no need to distill
+                if is_eps:
+                    pstoeps(str(tmppath))
+                _move_path_to_path_or_stream(tmppath, outfile)
+                return
+
             if orientation is _Orientation.landscape:  # now, ready to rotate
                 width, height = height, width
                 bbox = (lly, llx, ury, urx)
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -254,6 +254,22 @@ def test_linedash():
     assert buf.tell() > 0
 
 
+def test_noembed_fonts():
+    """Test that fonts are not embedded when no text is used"""
+    mpl.rcParams["text.usetex"] = True
+    fig, ax = plt.subplots()
+    ax.set_axis_off()
+
+    # About 160k with embedded fonts
+    buf = io.BytesIO()
+    fig.savefig(buf, format="ps")
+    assert buf.getbuffer().nbytes < 1000
+
+    buf = io.BytesIO()
+    fig.savefig(buf, format="eps")
+    assert buf.getbuffer().nbytes < 1000
+
+
 def test_no_duplicate_definition():
 
     fig = Figure()
