cairo_pattern_mesh_begin_patch bug问题

Snapshot 1.11.2 (2011-01-23)
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In this first snapshot along the way to cairo-1.12.0, we are very excited
to announce the introduction of Bezier surface gradients, known as type
6/7 gradients in PS/PDF parlance. This is the culmination of much work by
the dynamic duo: Adrian Johnson and Andrea Canciani. Thanks guys!

Also, I want to warmly welcome Uli Schlachter who recently joined the
Cairo community on a mission. That mission is to make cairo-xcb a
supported backend for 1.12. And for this snapshot he has made great
strides in fixing all the bugs I had left behind. Thanks Uli!

And we have also seen a new contributor, Alexandros Frantzis, who has
begun bringing up cairo-gl for GLESv2 devices. Thanks Alex!

And lastly, I must also thank Adrian and Andrea for the vast numbers of
bugs that they have tackled between them, fixing all those little corner
cases that lie hidden until too late.

API additions:

The ability to construct piece-wise Bezier surface gradients:

cairo_pattern_create_mesh

constructs a pattern of type CAIRO_PATTERN_TYPE_MESH using

cairo_pattern_mesh_begin_patch
cairo_pattern_mesh_end_patch
cairo_pattern_mesh_curve_to
cairo_pattern_mesh_line_to
cairo_pattern_mesh_move_to
cairo_pattern_mesh_set_control_point
cairo_pattern_mesh_set_corner_color_rgb
cairo_pattern_mesh_set_corner_color_rgba
cairo_pattern_mesh_get_patch_count
cairo_pattern_mesh_get_path
cairo_pattern_mesh_get_corner_color_rgba
cairo_pattern_mesh_get_control_point

The introduction of a unique ID accessible via the mime data type:
CAIRO_MIME_TYPE_UNIQUE_ID