only create new instance if needed for colorspacexformer

just an experiment to address performance when imagefilters are cached.

Bug: skia:
Change-Id: Ic1033c897d0a569b46a339fb3ae7f8f961882953
Reviewed-on: https://skia-review.googlesource.com/21395
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 2af0ee3e6e..af9561bc23 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -406,6 +406,10 @@ protected:
     }
     virtual sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const = 0;
 
+    sk_sp<SkImageFilter> refMe() const {
+        return sk_ref_sp(const_cast<SkImageFilter*>(this));
+    }
+
 private:
     // For makeColorSpace().
     friend class ArithmeticImageFilterImpl;