app: add gimp_transform_polygon()

gimp_transform_polygon() transforms an (open or closed) polygon by a GimpMatrix3, performing clipping to the near plane, to avoid erroneously transforming points behind the camera.
2018-01-28 09:41:19 -05:00
parent 7dfe81f13d
commit cc20cb41f3
2 changed files with 84 additions and 0 deletions
--- a/app/core/gimp-transform-utils.h
+++ b/app/core/gimp-transform-utils.h
@ -98,5 +98,12 @@ gboolean   gimp_transform_polygon_is_convex    (gdouble              x1,
                                                gdouble              x4,
                                                gdouble              y4);

+void       gimp_transform_polygon              (const GimpMatrix3   *matrix,
+                                                const GimpVector2   *vertices,
+                                                gint                 n_vertices,
+                                                gboolean             closed,
+                                                GimpVector2         *t_vertices,
+                                                gint                *n_t_vertices);
+

 #endif  /*  __GIMP_TRANSFORM_UTILS_H__  */