Partial fix for Matplotlib 3.9's test suite.

Author: anntzer

ext/_mplcairo.cpp

@@ -1588,10 +1588,12 @@ void GraphicsContextRenderer::draw_text(
                   next_glyphs_pos = glyphs_pos + cluster.num_glyphs;
       for (auto j = glyphs_pos; j < next_glyphs_pos; ++j) {
         if (!gac.glyphs[j].index) {
-          auto missing =
-            py::cast(s.substr(bytes_pos, cluster.num_bytes))
-            .attr("encode")("ascii", "namereplace");
-          warn_on_missing_glyph(missing.cast<std::string>());
+          auto missing = py::cast(s.substr(bytes_pos, cluster.num_bytes));
+          warn_on_missing_glyph(  // Format forced by test_mathtext_ticks.
+            "{} ({})"_format(
+              py::module::import("builtins").attr("ord")(missing),
+              missing.attr("encode")("ascii", "namereplace").attr("decode")())
+            .cast<std::string>());
         }
       }
       bytes_pos = next_bytes_pos;

ext/_util.cpp

@@ -903,8 +903,8 @@ void warn_on_missing_glyph(std::string s)
 {
   PY_CHECK(
     PyErr_WarnEx,
-    nullptr,
-    "Requested glyph ({}) missing from current font."_format(s)
+    PyExc_UserWarning,
+    "Glyph {} missing from current font."_format(s)
     .cast<std::string>().c_str(),
     1);
 }

src/mplcairo/base.py

@@ -315,6 +315,7 @@ def _print_vector(self, renderer_factory,
     def _print_ps_impl(self, is_eps, path_or_stream, *,
                        metadata=None, orientation="portrait", papertype=None,
                        **kwargs):
+        # FIXME: papertype seems currently broken.
         if papertype is None:
             papertype = mpl.rcParams["ps.papersize"]
         if orientation == "portrait":
@@ -342,11 +343,15 @@ def _print_ps_impl(self, is_eps, path_or_stream, *,
             with TemporaryDirectory() as tmp_dirname:
                 tmp_name = Path(tmp_dirname, "tmp")
                 print_method(tmp_name, metadata=metadata, **kwargs)
-                # Assume we can get away without passing the bbox.
+                # Assume we can get away with just passing bbox width/height.
+                wh = (self.figure.bbox.width, self.figure.bbox.height)
+                if orientation == "landscape":
+                    wh = wh[::-1]
                 {"ghostscript": backend_ps.gs_distill,
                  "xpdf": backend_ps.xpdf_distill}[
                      mpl.rcParams["ps.usedistiller"]](
-                         str(tmp_name), is_eps, ptype=papertype)
+                         str(tmp_name), is_eps, ptype=papertype,
+                         bbox=(None, None, *wh))
                 # If path_or_stream is *already* a text-mode stream then
                 # tmp_name needs to be opened in text-mode too.
                 with cbook.open_file_cm(path_or_stream, "wb") as stream, \