Fix SVG fonts

Author: liZe

weasyprint/draw.py

@@ -1177,7 +1177,8 @@ def draw_first_line(stream, textbox, text_overflow, block_ellipsis, x, y):
                 hb_data = harfbuzz.hb_blob_get_data(hb_blob, stream.length)
                 if hb_data != ffi.NULL:
                     svg_data = ffi.unpack(hb_data, int(stream.length[0]))
-                    image = SVGImage(svg_data, None, None, stream)
+                    tree = ElementTree.fromstring(svg_data)
+                    image = SVGImage(tree, None, None, stream)
                     a = d = font.widths[glyph] / 1000 / font.upem * font_size
                     emojis.append([image, font, a, d, x_advance, 0])
             elif font.png: