core: reintroduce bot-scan-converter functions

These functions have been accidentially removed by commit:
494cfd7.

They're still needed by the DRM backend.
(will be used by subsequent patches)

Signed-off-by: Enrico Weigelt, metux IT consult <enrico.weigelt@gr13.net>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Cc: Uli Schlachter <psychon@znc.in>

src/cairo-botor-scan-converter.c

@@ -2128,6 +2128,42 @@ botor_add_edge (cairo_botor_scan_converter_t *self,
     return CAIRO_STATUS_SUCCESS;
 }
 
+static cairo_status_t
+_cairo_botor_scan_converter_add_edge (void		*converter,
+				      const cairo_point_t *p1,
+				      const cairo_point_t *p2,
+				      int top, int bottom,
+				      int dir)
+{
+    cairo_botor_scan_converter_t *self = converter;
+    cairo_edge_t edge;
+
+    edge.line.p1 = *p1;
+    edge.line.p2 = *p2;
+    edge.top = top;
+    edge.bottom = bottom;
+    edge.dir = dir;
+
+    return botor_add_edge (self, &edge);
+}
+
+cairo_status_t
+_cairo_botor_scan_converter_add_polygon (cairo_botor_scan_converter_t *converter,
+					 const cairo_polygon_t *polygon)
+{
+    cairo_botor_scan_converter_t *self = converter;
+    cairo_status_t status;
+    int i;
+
+    for (i = 0; i < polygon->num_edges; i++) {
+	status = botor_add_edge (self, &polygon->edges[i]);
+	if (unlikely (status))
+	    return status;
+    }
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
 static void
 _cairo_botor_scan_converter_destroy (void *converter)
 {

src/cairo-spans-private.h

@@ -168,6 +168,10 @@ _cairo_botor_scan_converter_init (cairo_botor_scan_converter_t *self,
 				  const cairo_box_t *extents,
 				  cairo_fill_rule_t fill_rule);
 
+cairo_private cairo_status_t
+_cairo_botor_scan_converter_add_polygon (cairo_botor_scan_converter_t *converter,
+					const cairo_polygon_t *polygon);
+
 /* cairo-spans.c: */
 
 cairo_private cairo_scan_converter_t *