[pygobject] Add cairo_matrix_t converter to GValue.

[Christoph Reiter <creiter src gnome org>]

commit d519d8c245a0ee0da964692149a3140d996dbc2a
Author: Renato Florentino Garcia <fgarcia renato gmail com>
Date:   Tue Feb 19 14:14:23 2019 -0300

    Add cairo_matrix_t converter to GValue.

 gi/pygi-foreign-cairo.c | 34 ++++++++++++++++++++++++++++++++++
 tests/test_cairo.py     |  2 ++
 2 files changed, 36 insertions(+)
---
diff --git a/gi/pygi-foreign-cairo.c b/gi/pygi-foreign-cairo.c
index efb62544..399fe75e 100644
--- a/gi/pygi-foreign-cairo.c
+++ b/gi/pygi-foreign-cairo.c
@@ -583,6 +583,36 @@ cairo_matrix_release (GIBaseInfo *base_info,
     Py_RETURN_NONE;
 }
 
+static int
+cairo_matrix_to_gvalue (GValue *value, PyObject *obj)
+{
+    cairo_matrix_t *matrix;
+
+    if (!PyObject_TypeCheck (obj, &PycairoMatrix_Type)) {
+        PyErr_SetString (PyExc_TypeError, "Expected cairo.Matrix");
+        return -1;
+    }
+
+    matrix = &(( (PycairoMatrix*) obj)->matrix);
+    if (!matrix) {
+        return -1;
+    }
+
+    g_value_set_boxed (value, matrix);
+    return 0;
+}
+
+static PyObject *
+cairo_matrix_from_gvalue (const GValue *value)
+{
+    cairo_matrix_t *matrix = g_value_get_boxed(value);
+    if (!matrix) {
+        Py_RETURN_NONE;
+    }
+
+    return PycairoMatrix_FromMatrix (matrix);
+}
+
 static PyMethodDef _gi_cairo_functions[] = { {0,} };
 PYGLIB_MODULE_START(_gi_cairo, "_gi_cairo")
 {
@@ -644,6 +674,10 @@ PYGLIB_MODULE_START(_gi_cairo, "_gi_cairo")
                                   cairo_region_from_arg,
                                   cairo_region_release);
 
+    pyg_register_gtype_custom (CAIRO_GOBJECT_TYPE_MATRIX,
+                               cairo_matrix_from_gvalue,
+                               cairo_matrix_to_gvalue);
+
     pyg_register_gtype_custom (CAIRO_GOBJECT_TYPE_CONTEXT,
                                cairo_context_from_gvalue,
                                cairo_context_to_gvalue);
diff --git a/tests/test_cairo.py b/tests/test_cairo.py
index d03e85df..37a6ac38 100644
--- a/tests/test_cairo.py
+++ b/tests/test_cairo.py
@@ -34,12 +34,14 @@ class Test(unittest.TestCase):
     def test_gvalue_converters(self):
         surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 10, 10)
         context = cairo.Context(surface)
+        matrix = cairo.Matrix()
         objects = {
             'CairoContext': context,
             'CairoSurface': surface,
             'CairoFontFace': context.get_font_face(),
             'CairoScaledFont': context.get_scaled_font(),
             'CairoPattern': context.get_source(),
+            'CairoMatrix': matrix,
         }
         for type_name, cairo_obj in objects.items():
             gtype = GObject.type_from_name(type_name)