Fixed bad bitmap size crashes

include/core/SkPixelRef.h

Index: include/core/SkPixelRef.h
diff --git a/include/core/SkPixelRef.h b/include/core/SkPixelRef.h
index d90e58719bb0b87f5bd3b5ce9b0dc4c90e056259..76a8f9e2345ad83ba45697926fd8825d4ee2ca90 100644
--- a/include/core/SkPixelRef.h
+++ b/include/core/SkPixelRef.h
@@ -257,6 +257,9 @@ protected:
     // default impl returns NULL.
     virtual SkData* onRefEncodedData();
 
+    // default impl returns 0.

[reed1, 2013/12/03 19:02:50]

Lets change the dox to document what this does/returns.
Is it the safe-size or the "normal" size? Is it useful/well-defined w/o
rowbytes?

[sugoi, 2013/12/03 19:07:22]

I'll add the dox. It should return the allocated size in memory of the current
SkPixelRef's internal data, such that offset + safe-size should never overflow
that amount of allocated memory (If I understand things correctly).

[sugoi, 2013/12/03 19:18:06]

Done.

+    virtual size_t getSize() const;
+
     /** Return the mutex associated with this pixelref. This value is assigned
         in the constructor, and cannot change during the lifetime of the object.
     */