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///////////////////////////////////////////////////////////////////////
// -------------------
// DeKorator window decoration for KDE
// -------------------
// Copyright (C) 2005 moty rahamim <moty.rahamim@gmail.com>
//
// Based on Example-0.8, some ideas and code have been taken from plastik and KCMicons
//
// Example window decoration for KDE
// Copyright (c) 2003, 2004 David Johnson <david@usermode.org>
//
// Plastik KWin window decoration
// Copyright (C) 2003-2005 Sandro Giessl <sandro@giessl.com>
//
// KCMicons for KDE
// Copyright (c) 2000 Antonio Larrosa <larrosa@kde.org>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
///////////////////////////////////////////////////////////////////////
#if defined(HAVE_CONFIG_H)
# include "config.h"
#endif
#include "shadow.h"
#include <tqcolor.h>
ShadowEngine::ShadowEngine()
{
thickness_ = 1;
multiplicationFactor_ = 10.0;
}
ShadowEngine::~ShadowEngine()
{
}
TQImage ShadowEngine::makeShadow(const TQPixmap& textPixmap, const TQColor &bgColor)
{
TQImage result;
// create a new image for for the shaddow
int w = textPixmap.width();
int h = textPixmap.height();
// avoid calling these methods for every pixel
int bgRed = bgColor.red();
int bgGreen = bgColor.green();
int bgBlue = bgColor.blue();
double alphaShadow;
/*
* This is the source pixmap
*/
TQImage img = textPixmap.convertToImage().convertDepth(32);
/*
* Resize the image if necessary
*/
if ((result.width() != w) || (result.height() != h))
{
result.create(w, h, 32);
}
result.fill(0); // all black
result.setAlphaBuffer(true);
for (int i = thickness_; i < w - thickness_; i++)
{
for (int j = thickness_; j < h - thickness_; j++)
{
alphaShadow = decay(img, i, j);
alphaShadow = (alphaShadow > 180.0) ? 180.0 : alphaShadow;
// update the shadow's i,j pixel.
result.setPixel(i,j, tqRgba(bgRed, bgGreen , bgBlue, (int) alphaShadow));
}
}
return result;
}
double ShadowEngine::decay(TQImage& source, int i, int j)
{
// create a new image for the shadow
int w = source.width();
int h = source.height();
int sx, sy;
double alphaShadow = 0;
double opacity = 0;
for (int k = 1; k <= thickness_; k++) {
/* Generate a shadow thickness_ pixels thicker
* on either side than the text image. Ensure
* that i +/- k and j +/- k are within the
* bounds of the text pixmap.
*/
opacity = 0;
for (int l = -k; l <= k; l++) {
if (i < k)
sx = 0;
else if (i >= w - k)
sx = w - 1;
else
sx = i + l;
for (int m = -k; m <= k; m++) {
if (j < k)
sy = 0;
else if (j >= h - k)
sy = h - 1;
else
sy = j + m;
opacity += tqGray(source.pixel(sx, sy));
}
}
alphaShadow += opacity / multiplicationFactor_;
}
return alphaShadow;
}
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