forked from openkylin/kolourpaint
76 lines
2.4 KiB
C++
76 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_PIXMAP_FX 0
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#include "kpEffectGrayscale.h"
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#include "pixmapfx/kpPixmapFX.h"
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static QRgb toGray (QRgb rgb)
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{
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// naive way that doesn't preserve brightness
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// int gray = (qRed (rgb) + qGreen (rgb) + qBlue (rgb)) / 3;
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// over-exaggerates red & blue
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// int gray = qGray (rgb);
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int gray = (212671 * qRed (rgb) + 715160 * qGreen (rgb) + 72169 * qBlue (rgb)) / 1000000;
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return qRgba (gray, gray, gray, qAlpha (rgb));
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}
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// public static
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kpImage kpEffectGrayscale::applyEffect (const kpImage &image)
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{
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kpImage qimage(image);
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// TODO: Why not just write to the kpImage directly?
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if (qimage.depth () > 8)
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{
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for (int y = 0; y < qimage.height (); y++)
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{
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for (int x = 0; x < qimage.width (); x++)
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{
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qimage.setPixel (x, y, toGray (qimage.pixel (x, y)));
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}
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}
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}
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else
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{
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// 1- & 8- bit images use a color table
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for (int i = 0; i < qimage.colorCount (); i++) {
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qimage.setColor (i, toGray (qimage.color (i)));
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}
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}
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return qimage;
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}
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