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128 lines
4.4 KiB
128 lines
4.4 KiB
/* ============================================================
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*
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* This file is a part of digiKam project
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* http://www.digikam.org
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*
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* Date : 2005-05-25
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* Description : Emboss threaded image filter.
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*
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* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
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* Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
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*
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* Original Emboss algorithm copyrighted 2004 by
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* Pieter Z. Voloshyn <pieter dot voloshyn at gmail dot com>.
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software Foundation;
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* either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ============================================================ */
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// C++ includes.
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#include <cmath>
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#include <cstdlib>
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// Local includes.
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#include "dimg.h"
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#include "dimgimagefilters.h"
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#include "emboss.h"
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namespace DigikamEmbossImagesPlugin
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{
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Emboss::Emboss(Digikam::DImg *orgImage, TQObject *parent, int depth)
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: Digikam::DImgThreadedFilter(orgImage, parent, "Emboss")
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{
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m_depth = depth;
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initFilter();
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}
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void Emboss::filterImage(void)
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{
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embossImage(&m_orgImage, &m_destImage, m_depth);
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}
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// This method have been ported from Pieter Z. Voloshyn algorithm code.
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/* Function to apply the Emboss effect
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*
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* data => The image data in RGBA mode.
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* Width => Width of image.
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* Height => Height of image.
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* d => Emboss value
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*
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* Theory => This is an amazing effect. And the theory is very simple to
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* understand. You get the diference between the colors and
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* increase it. After this, get the gray tone
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*/
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void Emboss::embossImage(Digikam::DImg *orgImage, Digikam::DImg *destImage, int d)
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{
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int Width = orgImage->width();
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int Height = orgImage->height();
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uchar* data = orgImage->bits();
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bool sixteenBit = orgImage->sixteenBit();
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int bytesDepth = orgImage->bytesDepth();
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uchar* Bits = destImage->bits();
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// Initial copy
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memcpy (Bits, data, destImage->numBytes());
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double Depth = d / 10.0;
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int progress;
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int red, green, blue, gray;
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Digikam::DColor color, colorOther;
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int offset, offsetOther;
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for (int h = 0 ; !m_cancel && (h < Height) ; h++)
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{
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for (int w = 0 ; !m_cancel && (w < Width) ; w++)
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{
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offset = getOffset(Width, w, h, bytesDepth);
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offsetOther = getOffset(Width, w + Lim_Max (w, 1, Width), h + Lim_Max (h, 1, Height), bytesDepth);
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color.setColor(Bits + offset, sixteenBit);
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colorOther.setColor(Bits + offsetOther, sixteenBit);
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if (sixteenBit)
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{
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red = abs ((int)((color.red() - colorOther.red()) * Depth + 32768));
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green = abs ((int)((color.green() - colorOther.green()) * Depth + 32768));
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blue = abs ((int)((color.blue() - colorOther.blue()) * Depth + 32768));
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gray = CLAMP065535 ((red + green + blue) / 3);
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}
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else
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{
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red = abs ((int)((color.red() - colorOther.red()) * Depth + 128));
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green = abs ((int)((color.green() - colorOther.green()) * Depth + 128));
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blue = abs ((int)((color.blue() - colorOther.blue()) * Depth + 128));
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gray = CLAMP0255 ((red + green + blue) / 3);
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}
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// Overwrite RGB values to destination. Alpha remains unchanged.
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color.setRed(gray);
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color.setGreen(gray);
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color.setBlue(gray);
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color.setPixel(Bits + offset);
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}
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progress = (int) (((double)h * 100.0) / Height);
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if ( progress%5 == 0 )
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postProgress( progress );
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}
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}
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} // NameSpace DigikamEmbossImagesPlugin
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