Partial fix for Matplotlib 3.8's test suite.

ext/_mplcairo.cpp

@@ -180,7 +180,7 @@ GraphicsContextRenderer::AdditionalContext::AdditionalContext(
   }, state.antialias);
   // Clip, if needed.  Cannot be done earlier as we need to be able to unclip.
   if (auto const& rectangle = state.clip_rectangle) {
-    auto const& [x, y, w, h] = *rectangle;
+    auto const& [x, y, w, h] = rectangle->attr("bounds").cast<rectangle_t>();
     cairo_save(cr);
     restore_init_matrix(cr);
     cairo_new_path(cr);
@@ -681,11 +681,7 @@ void GraphicsContextRenderer::set_capstyle(std::string capstyle)
 void GraphicsContextRenderer::set_clip_rectangle(
   std::optional<py::object> rectangle)
 {
-  get_additional_state().clip_rectangle =
-    rectangle
-    // A TransformedBbox or a tuple.
-    ? py::getattr(*rectangle, "bounds", *rectangle).cast<rectangle_t>()
-    : std::optional<rectangle_t>{};
+  get_additional_state().clip_rectangle = rectangle;
 }
 
 void GraphicsContextRenderer::set_clip_path(
@@ -2205,7 +2201,7 @@ Only intended for debugging purposes.
 
     .def(
       "get_clip_rectangle",
-      [](GraphicsContextRenderer& gcr) -> std::optional<rectangle_t> {
+      [](GraphicsContextRenderer& gcr) -> std::optional<py::object> {
         return gcr.get_additional_state().clip_rectangle;
       })
     .def(

ext/_util.h

@@ -131,7 +131,7 @@ struct AdditionalState {
   double width, height, dpi;
   std::optional<double> alpha;
   std::variant<cairo_antialias_t, bool> antialias;
-  std::optional<rectangle_t> clip_rectangle;
+  std::optional<py::object> clip_rectangle;
   std::tuple<std::optional<py::object>, std::shared_ptr<cairo_path_t>>
     clip_path;
   std::optional<std::string> hatch;

src/mplcairo/base.py

@@ -195,6 +195,12 @@ def _check_print_extra_kwargs(*,
     pass
 
 
+def _check_no_metadata(metadata):
+    if metadata is not None:
+        raise ValueError(  # Start of error string is forced by test.
+            "metadata not supported for the requested output format")
+
+
 class FigureCanvasCairo(FigureCanvasBase):
     # Although this attribute should semantically be set from __init__ (it is
     # purely an instance attribute), initializing it at the class level helps
@@ -314,7 +320,7 @@ def _print_ps_impl(self, is_eps, path_or_stream, *,
             f"%%Orientation: {orientation}"]
         if "Title" in metadata:
             dsc_comments.append("%%Title: {}".format(metadata.pop("Title")))
-        if not is_eps:
+        if not is_eps and papertype != "figure":
             dsc_comments.append(f"%%DocumentPaperSizes: {papertype}")
         print_method = partial(self._print_vector,
                                GraphicsContextRendererCairo._for_eps_output
@@ -351,6 +357,7 @@ def _get_fresh_straight_rgba8888(self):
     def print_rgba(self, path_or_stream, *,
                    dryrun=False, metadata=None, **kwargs):
         _check_print_extra_kwargs(**kwargs)
+        _check_no_metadata(metadata)
         img = self._get_fresh_straight_rgba8888()
         if dryrun:
             return
@@ -382,7 +389,9 @@ def print_png(self, path_or_stream, *,
             **(pil_kwargs if pil_kwargs is not None else {})})
 
     def print_jpeg(self, path_or_stream, *,
-                   dryrun=False, pil_kwargs=None, **kwargs):
+                   dryrun=False, metadata=None, pil_kwargs=None, **kwargs):
+        _check_print_extra_kwargs(**kwargs)
+        _check_no_metadata(metadata)
         # Remove transparency by alpha-blending on an assumed white background.
         r, g, b, a = mpl.colors.to_rgba(self.figure.get_facecolor())
         try:
@@ -392,16 +401,16 @@ def print_jpeg(self, path_or_stream, *,
             self.figure.set_facecolor((r, g, b, a))
         if dryrun:
             return
-        _check_print_extra_kwargs(**kwargs)
         Image.fromarray(img).save(path_or_stream, format="jpeg", **{
             "dpi": (self.figure.dpi, self.figure.dpi),
             **(pil_kwargs if pil_kwargs is not None else {})})
 
     print_jpg = print_jpeg
 
     def print_tiff(self, path_or_stream, *,
-                   dryrun=False, pil_kwargs=None, **kwargs):
+                   dryrun=False, metadata=None, pil_kwargs=None, **kwargs):
         _check_print_extra_kwargs(**kwargs)
+        _check_no_metadata(metadata)
         img = self._get_fresh_straight_rgba8888()
         if dryrun:
             return
@@ -412,8 +421,9 @@ def print_tiff(self, path_or_stream, *,
     print_tif = print_tiff
 
     def print_webp(self, path_or_stream, *,
-                   dryrun=False, pil_kwargs=None, **kwargs):
+                   dryrun=False, metadata=None, pil_kwargs=None, **kwargs):
         _check_print_extra_kwargs(**kwargs)
+        _check_no_metadata(metadata)
         img = self._get_fresh_straight_rgba8888()
         if dryrun:
             return