Add isEncoded to SkImageGenerator

include/core/SkImageGenerator.h

Index: include/core/SkImageGenerator.h
diff --git a/include/core/SkImageGenerator.h b/include/core/SkImageGenerator.h
index 3712a924a55f45e21439f9d631bad4ad02ecd3f9..1bd43675fb91fbb0f4e07018da2d4587762cd050 100644
--- a/include/core/SkImageGenerator.h
+++ b/include/core/SkImageGenerator.h
@@ -70,6 +70,11 @@ public:
     uint32_t uniqueID() const { return fUniqueID; }
 
     /**
+     * Returns true if the image is encoded (i.e. compressed).
+     */
+    bool isEncoded() const { return this->onIsEncoded(); }

[cblume, 2016/10/20 19:08:39]

Note that this is adding a function to the public API.
I know we would prefer to change the public API as little as possible. If there
is a better alternative I'm happy to do that.

+
+    /**
      *  Return a ref to the encoded (i.e. compressed) representation,
      *  of this data. If the GrContext is non-null, then the caller is only interested in
      *  gpu-specific formats, so the impl may return null even if they have encoded data,
@@ -257,6 +262,8 @@ protected:
 
     SkImageGenerator(const SkImageInfo& info, uint32_t uniqueId = kNeedNewImageUniqueID);
 
+    virtual bool onIsEncoded() const;
+
     virtual SkData* onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM);
 
     virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,