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38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
/*
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SPDX-FileCopyrightText: 2014 Alex Merry <alex.merry@kdemail.net>
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SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
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*/
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template<class Trait>
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static bool fuzzyeq(const QImage &im1, const QImage &im2, uchar fuzziness)
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{
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Q_ASSERT(im1.format() == im2.format());
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Q_ASSERT(im1.depth() == 24 || im1.depth() == 32 || im1.depth() == 64);
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const int height = im1.height();
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const int width = im1.width();
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for (int i = 0; i < height; ++i) {
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const Trait *line1 = reinterpret_cast<const Trait *>(im1.scanLine(i));
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const Trait *line2 = reinterpret_cast<const Trait *>(im2.scanLine(i));
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for (int j = 0; j < width; ++j) {
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if (line1[j] > line2[j]) {
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if (line1[j] - line2[j] > fuzziness) {
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return false;
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}
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} else {
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if (line2[j] - line1[j] > fuzziness) {
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return false;
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}
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}
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}
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}
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return true;
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}
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// allow each byte to be different by up to 1, to allow for rounding errors
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static bool fuzzyeq(const QImage &im1, const QImage &im2, uchar fuzziness)
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{
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return (im1.depth() == 64) ? fuzzyeq<quint16>(im1, im2, fuzziness) : fuzzyeq<quint8>(im1, im2, fuzziness);
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}
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