/*

 * 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 SkSampledCodec_DEFINED

#define SkSampledCodec_DEFINED

#include "include/codec/SkAndroidCodec.h"

#include "include/codec/SkCodec.h"

/**

 *  This class implements the functionality of SkAndroidCodec.  Scaling will

 *  be provided by sampling if it cannot be provided by fCodec.

 */

class SkSampledCodec : public SkAndroidCodec {

public:

    explicit SkSampledCodec(SkCodec*);

    ~SkSampledCodec() override {}

protected:

    SkISize onGetSampledDimensions(int sampleSize) const override;

    bool onGetSupportedSubset(SkIRect* desiredSubset) const override { return true; }

    SkCodec::Result onGetAndroidPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,

            const AndroidOptions& options) override;

private:

    /**

     *  Find the best way to account for native scaling.

     *

     *  Return a size that fCodec can scale to, and adjust sampleSize to finish scaling.

     *

     *  @param sampleSize As an input, the requested sample size.

     *                    As an output, sampling needed after letting fCodec

     *                    scale to the returned dimensions.

     *  @param nativeSampleSize Optional output parameter. Will be set to the

     *                          effective sample size done by fCodec.

     *  @return SkISize The size that fCodec should scale to.

     */

    SkISize accountForNativeScaling(int* sampleSize, int* nativeSampleSize = nullptr) const;

    /**

     *  This fulfills the same contract as onGetAndroidPixels().

     *

     *  We call this function from onGetAndroidPixels() if we have determined

     *  that fCodec does not support the requested scale, and we need to

     *  provide the scale by sampling.

     */

    SkCodec::Result sampledDecode(const SkImageInfo& info, void* pixels, size_t rowBytes,

            const AndroidOptions& options);

    using INHERITED = SkAndroidCodec;

};

#endif // SkSampledCodec_DEFINED