Remove SkEncodedInfo kUnknown_Color and kUnknown_Alpha from public API

src/codec/SkWebpCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkWebpCodec_DEFINED
 #define SkWebpCodec_DEFINED
 
@@ skipping 16 matching lines @@
     Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
             override;
     SkEncodedFormat onGetEncodedFormat() const override { return kWEBP_SkEncodedFormat; }
 
     SkISize onGetScaledDimensions(float desiredScale) const override;
 
     bool onDimensionsSupported(const SkISize&) override;
 
     bool onGetValidSubset(SkIRect* /* desiredSubset */) const override;
 private:
+    static bool ReadHeader(SkStream* stream, SkCodec** outCodec);

[msarett, 2016/04/25 14:59:10]

Leon, do you remember why SkWebpCodec doesn't need to override onRewind()?

[scroggo, 2016/04/25 15:10:43]

It doesn't store any information locally. e.g. SkPngCodec has a png_struct etc,
which it needs to delete and recreate. But SkWebCodec has nothing like that.

[msarett, 2016/04/25 15:18:21]

Acknowledged.

+
     SkWebpCodec(int width, int height, const SkEncodedInfo&, SkStream*);
 
     typedef SkCodec INHERITED;
 };
 #endif // SkWebpCodec_DEFINED