cache SkImage::Info calculation in lazypixelref

src/lazy/SkLazyPixelRef.h

Index: src/lazy/SkLazyPixelRef.h
diff --git a/src/lazy/SkLazyPixelRef.h b/src/lazy/SkLazyPixelRef.h
index c51675dd5f301e648e20db0daa40db3a1d7faae6..a1f054e966f344cc17ce5cc2f048203c3cc487dc 100644
--- a/src/lazy/SkLazyPixelRef.h
+++ b/src/lazy/SkLazyPixelRef.h
@@ -65,12 +65,16 @@ protected:
     virtual bool onDecodeInto(int pow2, SkBitmap*) SK_OVERRIDE;
 
 private:
+    // lazily initialized our cached info. Returns NULL on failure.
+    const SkImage::Info* getCachedInfo();

[scroggo, 2013/10/21 18:49:24]

style nit: other fields before methods.

+
     bool                        fErrorInDecoding;
     SkData*                     fData;
     SkBitmapFactory::DecodeProc fDecodeProc;
     SkImageCache*               fImageCache;
     intptr_t                    fCacheId;
     size_t                      fRowBytes;
+    SkImage::Info               fLazilyCachedInfo;
 
 #if LAZY_CACHE_STATS
     static int32_t              gCacheHits;