forked from openkylin/kolourpaint
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
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/*
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Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define DEBUG_KP_EFFECT_EMBOSS 0
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#include "kpEffectEmboss.h"
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#include "blitz.h"
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#include "kpLogCategories.h"
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#include "pixmapfx/kpPixmapFX.h"
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static QImage EmbossQImage (const QImage &qimage_, int strength)
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{
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QImage qimage = qimage_;
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if (strength == 0) {
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return qimage;
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}
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// The numbers that follow were picked by experimentation to try to get
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// an effect linearly proportional to <strength> and at the same time,
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// be fast enough.
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//
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// I still have no idea what "radius" and "sigma" mean.
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const auto radius = 0.0;
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const auto sigma = 1.0;
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const auto repeat = 1;
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for (int i = 0; i < repeat; i++)
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{
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qimage = Blitz::emboss (qimage, radius, sigma);
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}
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return qimage;
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}
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// public static
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kpImage kpEffectEmboss::applyEffect (const kpImage &image, int strength)
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{
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#if DEBUG_KP_EFFECT_EMBOSS
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qCDebug(kpLogImagelib) << "kpEffectEmboss::applyEffect(strength=" << strength << ")"
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<< endl;
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#endif
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Q_ASSERT (strength >= MinStrength && strength <= MaxStrength);
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return ::EmbossQImage (image, strength);
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}
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