46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
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/*
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* Copyright 2016 Nu-book Inc.
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* Copyright 2016 ZXing authors
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* Copyright 2020 Axel Waggershauser
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*/
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "Point.h"
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#include "Quadrilateral.h"
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namespace ZXing {
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/**
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* <p>This class implements a perspective transform in two dimensions. Given four source and four
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* destination points, it will compute the transformation implied between them. The code is based
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* directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.</p>
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*/
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class PerspectiveTransform
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{
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using value_t = PointF::value_t;
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value_t a11, a12, a13, a21, a22, a23, a31, a32, a33 = NAN;
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PerspectiveTransform(value_t a11, value_t a21, value_t a31, value_t a12, value_t a22, value_t a32, value_t a13,
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value_t a23, value_t a33)
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: a11(a11), a12(a12), a13(a13), a21(a21), a22(a22), a23(a23), a31(a31), a32(a32), a33(a33)
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{}
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PerspectiveTransform inverse() const;
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PerspectiveTransform times(const PerspectiveTransform& other) const;
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static PerspectiveTransform UnitSquareTo(const QuadrilateralF& q);
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public:
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PerspectiveTransform() = default;
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PerspectiveTransform(const QuadrilateralF& src, const QuadrilateralF& dst);
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/// Project from the destination space (grid of modules) into the image space (bit matrix)
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PointF operator()(PointF p) const;
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bool isValid() const { return !std::isnan(a33); }
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};
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} // ZXing
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