Add scale and skew to C canvas API

include/c/sk_canvas.h

Index: include/c/sk_canvas.h
diff --git a/include/c/sk_canvas.h b/include/c/sk_canvas.h
index a99d1b866275f211f5956e8c0bb24ff37455f779..5a9a0c9e2869fbadf44e968824ccc898a87bb60f 100644
--- a/include/c/sk_canvas.h
+++ b/include/c/sk_canvas.h
@@ -21,6 +21,8 @@ void sk_canvas_restore(sk_canvas_t*);
 
 void sk_canvas_translate(sk_canvas_t*, float dx, float dy);
 void sk_canvas_scale(sk_canvas_t*, float sx, float sy);
+void sk_canvas_rotate(sk_canvas_t*, float degrees);

[reed1, 2014/12/01 20:25:09]

I've always felt a little bad about choosing degrees instead of radians. Perhaps
now is a good time to change our default to radians, and perhaps add a helper
(or not) for degress, like sk_canvas_rotate_degrees(...).

+void sk_canvas_skew(sk_canvas_t*, float sx, float sy);
 
 void sk_canvas_draw_paint(sk_canvas_t*, const sk_paint_t*);
 void sk_canvas_draw_rect(sk_canvas_t*, const sk_rect_t*, const sk_paint_t*);