Create an SkAndroidCodec API separate from SkCodec

include/codec/SkScaledCodec.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 SkScaledCodec_DEFINED
-#define SkScaledCodec_DEFINED
-
-#include "SkCodec.h"
-
-class SkStream;
-
-/**
- * This class implements scaling, by sampling scanlines in the y direction.
- * x-wise sampling is implemented in the swizzler, when getScanlines() is called.
- */
-class SkScaledCodec : public SkCodec {
-public:
-    static SkCodec* NewFromStream(SkStream*);
-    static SkCodec* NewFromData(SkData*);
-
-    virtual ~SkScaledCodec();
-
-    static void ComputeSampleSize(const SkISize& dstDim, const SkISize& srcDim,
-                                  int* sampleSizeX, int* sampleSizeY);
-
-protected:
-    bool onRewind() override;
-
-    /**
-     * Recommend a set of destination dimensions given a requested scale
-     */
-    SkISize onGetScaledDimensions(float desiredScale) const override;
-    bool onDimensionsSupported(const SkISize&) override;
-
-    Result onGetPixels(const SkImageInfo&, void*, size_t, const Options&, SkPMColor*, int*, int*)
-            override;
-    SkEncodedFormat onGetEncodedFormat() const override {
-        return fCodec->getEncodedFormat();
-    }
-
-    bool onReallyHasAlpha() const override {
-        return fCodec->reallyHasAlpha();
-    }
-
-    uint32_t onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const override;
-
-    SkScanlineOrder onGetScanlineOrder() const override;
-
-private:
-
-    SkAutoTDelete<SkCodec> fCodec;
-
-    explicit SkScaledCodec(SkCodec*);
-
-    typedef SkCodec INHERITED;
-};
-#endif // SkScaledCodec_DEFINED