Merge pull request #227 from dtromb/#226-hairline

Added Context.{get,set}_hairline(), according changes to ffi header, …

cairocffi/constants.py

@@ -482,6 +482,9 @@
 void
 cairo_set_line_width (cairo_t *cr, double width);
 
+void
+cairo_set_hairline (cairo_t *cr, cairo_bool_t set_hairline);
+
 typedef enum _cairo_line_cap {
  CAIRO_LINE_CAP_BUTT,
  CAIRO_LINE_CAP_ROUND,
@@ -1098,6 +1101,9 @@
 double
 cairo_get_line_width (cairo_t *cr);
 
+cairo_bool_t
+cairo_get_hairline (cairo_t *cr);
+
 cairo_line_cap_t
 cairo_get_line_cap (cairo_t *cr);
 

cairocffi/context.py

@@ -2255,3 +2255,26 @@ def tag_end(self, tag_name):
  """
  cairo.cairo_tag_end(self._pointer, _encode_string(tag_name))
  self._check_status()
+
+ def set_hairline(self, enabled):
+ """Sets lines within the cairo context to be hairlines.
+
+ Hairlines are logically zero-width lines that are drawn at the thinnest
+ renderable width possible in the current context.
+
+ :type enabled: bool
+ :param enabled: whether or not to set hairline mode
+
+ *New in cairo 1.18.*
+ """
+ cairo.cairo_set_hairline(self._pointer, int(enabled))
+ self._check_status()
+
+ def get_hairline(self):
+ """Returns whether or not hairline mode is set, as set by cairo_set_hairline().
+
+ :returns: whether hairline mode is set
+
+ *New in cairo 1.18.*
+ """
+ return bool(cairo.cairo_get_hairline(self._pointer))

cairocffi/test_cairo.py

@@ -1267,3 +1267,15 @@ def test_from_null_pointer():
  for class_ in [Surface, Context, Pattern, FontFace, ScaledFont]:
  with pytest.raises(ValueError):
  class_._from_pointer(cairocffi.ffi.NULL, 'unused')
+
+
+@pytest.mark.xfail(cairo_version() < 11800,
+ reason='Cairo version too low')
+def test_hairline():
+ for extents in [None, (0, 0, 140, 80)]:
+ surface = RecordingSurface(cairocffi.CONTENT_COLOR_ALPHA, extents)
+ ctx = Context(surface)
+ ctx.set_hairline(True)
+ assert(ctx.get_hairline() is True)
+ ctx.set_hairline(False)
+ assert(ctx.get_hairline() is False)