/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkSampledCodec_DEFINED
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#define SkSampledCodec_DEFINED
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#include "SkAndroidCodec.h"
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#include "SkCodec.h"
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/**
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* This class implements the functionality of SkAndroidCodec. Scaling will
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* be provided by sampling if it cannot be provided by fCodec.
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*/
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class SkSampledCodec : public SkAndroidCodec {
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public:
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explicit SkSampledCodec(SkCodec*, ExifOrientationBehavior);
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~SkSampledCodec() override {}
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protected:
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SkISize onGetSampledDimensions(int sampleSize) const override;
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bool onGetSupportedSubset(SkIRect* desiredSubset) const override { return true; }
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SkCodec::Result onGetAndroidPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
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const AndroidOptions& options) override;
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private:
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/**
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* Find the best way to account for native scaling.
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*
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* Return a size that fCodec can scale to, and adjust sampleSize to finish scaling.
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*
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* @param sampleSize As an input, the requested sample size.
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* As an output, sampling needed after letting fCodec
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* scale to the returned dimensions.
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* @param nativeSampleSize Optional output parameter. Will be set to the
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* effective sample size done by fCodec.
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* @return SkISize The size that fCodec should scale to.
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*/
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SkISize accountForNativeScaling(int* sampleSize, int* nativeSampleSize = nullptr) const;
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/**
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* This fulfills the same contract as onGetAndroidPixels().
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*
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* We call this function from onGetAndroidPixels() if we have determined
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* that fCodec does not support the requested scale, and we need to
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* provide the scale by sampling.
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*/
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SkCodec::Result sampledDecode(const SkImageInfo& info, void* pixels, size_t rowBytes,
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const AndroidOptions& options);
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typedef SkAndroidCodec INHERITED;
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};
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#endif // SkSampledCodec_DEFINED
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