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252 lines
6.5 KiB
252 lines
6.5 KiB
/* This file is proposed to be part of the KDE libraries.
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* Copyright (C) 2003 Laur Ivan <laurivan@eircom.net>
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*
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* Many thanks to:
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* - Bernardo Hung <deciare@gta.igs.net> for the enhanced shadow
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* algorithm (currently used)
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* - Tim Jansen <tim@tjansen.de> for the API updates and fixes.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <tqcolor.h>
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#include <tqpainter.h>
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#include <tqbitmap.h>
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#include <tqpixmap.h>
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#include "kshadowsettings.h"
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#include "kshadowengine.h"
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KShadowEngine::KShadowEngine() :
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m_shadowSettings( new KShadowSettings )
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{
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}
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KShadowEngine::~KShadowEngine()
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{
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delete m_shadowSettings;
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}
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KShadowEngine::KShadowEngine(KShadowSettings *fx) :
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m_shadowSettings(0L)
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{
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setShadowSettings(fx);
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}
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void KShadowEngine::setShadowSettings(KShadowSettings *fx)
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{
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delete m_shadowSettings;
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m_shadowSettings = fx;
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}
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KShadowSettings *KShadowEngine::shadowSettings()
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{
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return m_shadowSettings;
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}
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TQImage KShadowEngine::makeShadow(const TQPixmap& textPixmap, const TQColor &bgColor)
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{
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TQImage result;
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// create a new image for for the shaddow
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int w = textPixmap.width();
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int h = textPixmap.height();
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// avoid calling these methods for every pixel
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int bgRed = bgColor.red();
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int bgGreen = bgColor.green();
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int bgBlue = bgColor.blue();
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int thick = m_shadowSettings->thickness() >> 1;
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double alphaShadow;
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/*
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* This is the source pixmap
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*/
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TQImage img = TQImage(textPixmap.convertToImage()).convertDepth(32);
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/*
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* Resize the image if necessary
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*/
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if ((result.width() != w) || (result.height() != h))
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{
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result.create(w, h, 32);
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}
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result.fill(0); // all black
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result.setAlphaBuffer(true);
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for (int i = thick; i < w - thick; i++)
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{
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for (int j = thick; j < h - thick; j++)
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{
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switch (m_shadowSettings->algorithm())
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{
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case KShadowSettings::DoubleLinearDecay:
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alphaShadow = doubleLinearDecay(img, i, j);
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break;
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case KShadowSettings::RadialDecay:
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alphaShadow = radialDecay(img, i, j);
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break;
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case KShadowSettings::NoDecay:
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alphaShadow = noDecay(img, i, j);
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break;
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case KShadowSettings::DefaultDecay:
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default:
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alphaShadow = defaultDecay(img, i, j);
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}
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alphaShadow = (alphaShadow > m_shadowSettings->maxOpacity()) ? m_shadowSettings->maxOpacity() : alphaShadow;
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// update the shadow's i,j pixel.
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result.setPixel(i,j, tqRgba(bgRed, bgGreen , bgBlue, (int) alphaShadow));
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}
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}
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return result;
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}
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// Multiplication factor for pixels directly above, under, or next to the text
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#define AXIS_FACTOR 2.0
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// Multiplication factor for pixels diagonal to the text
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#define DIAGONAL_FACTOR 1.0
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double KShadowEngine::defaultDecay(TQImage& source, int i, int j)
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{
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if ((i < 1) || (j < 1) || (i > source.width() - 2) || (j > source.height() - 2))
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return 0;
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double alphaShadow;
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alphaShadow =(tqGray(source.pixel(i-1,j-1)) * DIAGONAL_FACTOR +
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tqGray(source.pixel(i-1,j )) * AXIS_FACTOR +
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tqGray(source.pixel(i-1,j+1)) * DIAGONAL_FACTOR +
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tqGray(source.pixel(i ,j-1)) * AXIS_FACTOR +
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0 +
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tqGray(source.pixel(i ,j+1)) * AXIS_FACTOR +
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tqGray(source.pixel(i+1,j-1)) * DIAGONAL_FACTOR +
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tqGray(source.pixel(i+1,j )) * AXIS_FACTOR +
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tqGray(source.pixel(i+1,j+1)) * DIAGONAL_FACTOR) / m_shadowSettings->multiplicationFactor();
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return alphaShadow;
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}
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double KShadowEngine::doubleLinearDecay(TQImage& source, int i, int j)
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{
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//printf("img: %p, %d %d\n", (char *) &source, i, j);
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return defaultDecay( source, i, j ); // for now
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}
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double KShadowEngine::radialDecay(TQImage& source, int i, int j)
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{
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//printf("img: %p, %d %d\n", (char *) &source, i, j);
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return defaultDecay( source, i, j ); // for now
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}
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double KShadowEngine::noDecay(TQImage& source, int i, int j)
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{
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// create a new image for for the shaddow
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int w = source.width();
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int h = source.height();
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int sx, sy;
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//int thick = m_shadowSettings->thickness() >> 1;
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double alphaShadow = 0;
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double opacity = 0;
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for (int k = 1; k <= m_shadowSettings->thickness(); k++) {
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/* Generate a shadow THICKNESS pixels thicker
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* on either side than the text image. Ensure
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* that i +/- k and j +/- k are within the
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* bounds of the text pixmap.
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*/
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opacity = 0;
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for (int l = -k; l <= k; l++) {
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if (i < k)
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sx = 0;
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else if (i >= w - k)
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sx = w - 1;
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else
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sx = i + l;
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for (int m = -k; m <= k; m++) {
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if (j < k)
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sy = 0;
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else if (j >= h - k)
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sy = h - 1;
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else
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sy = j + m;
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opacity += tqGray(source.pixel(sx, sy));
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}
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}
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alphaShadow += opacity / m_shadowSettings->multiplicationFactor();
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}
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return alphaShadow;
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}
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KTextShadowEngine::KTextShadowEngine() : KShadowEngine()
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{
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KShadowSettings *shadset = new KShadowSettings();
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shadset->setOffsetX(0);
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shadset->setOffsetY(0);
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shadset->setThickness(1);
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shadset->setMaxOpacity(96);
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setShadowSettings(shadset);
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}
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// taken from mtaskbar, by Sebastian Wolff
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void KTextShadowEngine::drawText(TQPainter &p, const TQRect &tr, int tf, const TQString &str, const TQSize &size)
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{
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// get the color of the shadow: white for dark text, black for bright text
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TQPen textPen = p.pen();
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TQColor shadCol = textPen.color();
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if (shadCol.red() +
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shadCol.green() +
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shadCol.blue() <= 3*256/2-1)
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{
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shadCol = TQColor(255,255,255);
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}
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else
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{
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shadCol = TQColor(0,0,0);
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}
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// get a transparent pixmap
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TQPainter pixPainter;
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TQPixmap textPixmap(size);
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textPixmap.fill(TQColor(0,0,0));
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textPixmap.setMask(textPixmap.createHeuristicMask(true));
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// draw text
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pixPainter.begin(&textPixmap);
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pixPainter.setPen(Qt::white);
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pixPainter.setFont(p.font()); // get the font from the root painter
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pixPainter.drawText(tr, tf, str);
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pixPainter.end();
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// draw shadow
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TQImage img = makeShadow(textPixmap, shadCol);
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// return
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p.drawImage(0, 0, img);
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p.drawText(tr, tf, str);
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}
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