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/*
* Copyright 2019 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkScalingCodec_DEFINED
#define SkScalingCodec_DEFINED
#include "include/codec/SkCodec.h"
// Helper class for an SkCodec that supports arbitrary downscaling.
class SkScalingCodec : public SkCodec {
protected:
SkScalingCodec(SkEncodedInfo&& info, XformFormat srcFormat, std::unique_ptr<SkStream> stream,
SkEncodedOrigin origin = kTopLeft_SkEncodedOrigin)
: INHERITED(std::move(info), srcFormat, std::move(stream), origin) {}
SkISize onGetScaledDimensions(float desiredScale) const override {
SkISize dim = this->dimensions();
// SkCodec treats zero dimensional images as errors, so the minimum size
// that we will recommend is 1x1.
dim.fWidth = SkTMax(1, SkScalarRoundToInt(desiredScale * dim.fWidth));
dim.fHeight = SkTMax(1, SkScalarRoundToInt(desiredScale * dim.fHeight));
return dim;
}
bool onDimensionsSupported(const SkISize& requested) override {
SkISize dim = this->dimensions();
int w = requested.width();
int h = requested.height();
return 1 <= w && w <= dim.width() && 1 <= h && h <= dim.height();
}
private:
typedef SkCodec INHERITED;
};
#endif // SkScalingCodec_DEFINED