Add some thread safety notes.

These are the main problems we tend to hit with multithreaded drawing.

Change-Id: I63dc56f38a533eb839d36833e865af5fcc700d3b
Reviewed-on: https://skia-review.googlesource.com/9100
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/core/SkMatrix44.h b/include/core/SkMatrix44.h
index 83e51abe55..c1b74582cb 100644
--- a/include/core/SkMatrix44.h
+++ b/include/core/SkMatrix44.h
@@ -126,6 +126,12 @@ struct SkVector4 {
     }
 };
 
+/** \class SkMatrix44
+
+    The SkMatrix44 class holds a 4x4 matrix.
+
+    SkMatrix44 is not thread safe unless you've first called SkMatrix44::getType().
+*/
 class SK_API SkMatrix44 {
 public: