take gr-context parameter to refEncoded, indicating a desire for only gpu-specific formats

include/core/SkImageGenerator.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageGenerator_DEFINED
 #define SkImageGenerator_DEFINED
 
 #include "SkBitmap.h"
 #include "SkColor.h"
 #include "SkImageInfo.h"
 
 class GrContext;
 class GrTexture;
 class GrTextureParams;
 class SkBitmap;
 class SkData;
 class SkImageGenerator;
 class SkMatrix;
 class SkPaint;
 class SkPicture;
 
+#ifdef SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
+    #define SK_REFENCODEDDATA_CTXPARAM
+#else
+    #define SK_REFENCODEDDATA_CTXPARAM  GrContext* ctx
+#endif
+
 /**
  *  Takes ownership of SkImageGenerator.  If this method fails for
  *  whatever reason, it will return false and immediatetely delete
  *  the generator.  If it succeeds, it will modify destination
  *  bitmap.
  *
  *  If generator is NULL, will safely return false.
  *
  *  If this fails or when the SkDiscardablePixelRef that is
  *  installed into destination is destroyed, it will
@@ skipping 22 matching lines @@
     /**
      *  The PixelRef which takes ownership of this SkImageGenerator
      *  will call the image generator's destructor.
      */
     virtual ~SkImageGenerator() { }
 
     uint32_t uniqueID() const { return fUniqueID; }
 
     /**
      *  Return a ref to the encoded (i.e. compressed) representation,
-     *  of this data.
+     *  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,
+     *  assuming they know it is not suitable for the gpu.
      *
      *  If non-NULL is returned, the caller is responsible for calling
      *  unref() on the data when it is finished.
      */
-    SkData* refEncodedData() { return this->onRefEncodedData(); }
+    SkData* refEncodedData(GrContext* ctx = nullptr) {
+#ifdef SK_SUPPORT_LEGACY_REFENCODEDDATA_NOCTX
+        return this->onRefEncodedData();
+#else
+        return this->onRefEncodedData(ctx);
+#endif
+    }
 
     /**
      *  Return the ImageInfo associated with this generator.
      */
     const SkImageInfo& getInfo() const { return fInfo; }
 
     /**
      *  Decode into the given pixels, a block of memory of size at
      *  least (info.fHeight - 1) * rowBytes + (info.fWidth *
      *  bytesPerPixel)
@@ skipping 140 matching lines @@
     }
     void generateBitmap(SkBitmap* bm, const SkImageInfo& info) {
         if (!this->tryGenerateBitmap(bm, &info, nullptr)) {
             sk_throw();
         }
     }
 
 protected:
     SkImageGenerator(const SkImageInfo& info);
 
-    virtual SkData* onRefEncodedData();
+    virtual SkData* onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM);
 
     virtual bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                              SkPMColor ctable[], int* ctableCount);
     virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]);
     virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
                                  SkYUVColorSpace* colorSpace);
 
     virtual GrTexture* onGenerateTexture(GrContext*, const SkIRect*) {
         return nullptr;
     }
@@ skipping 11 matching lines @@
     const SkImageInfo fInfo;
     const uint32_t fUniqueID;
 
     // This is our default impl, which may be different on different platforms.
     // It is called from NewFromEncoded() after it has checked for any runtime factory.
     // The SkData will never be NULL, as that will have been checked by NewFromEncoded.
     static SkImageGenerator* NewFromEncodedImpl(SkData*);
 };
 
 #endif  // SkImageGenerator_DEFINED