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-rw-r--r--kicker/libkicker/kshadowengine.cpp251
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diff --git a/kicker/libkicker/kshadowengine.cpp b/kicker/libkicker/kshadowengine.cpp
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+/* This file is proposed to be part of the KDE libraries.
+ * Copyright (C) 2003 Laur Ivan <laurivan@eircom.net>
+ *
+ * Many thanks to:
+ * - Bernardo Hung <deciare@gta.igs.net> for the enhanced shadow
+ * algorithm (currently used)
+ * - Tim Jansen <tim@tjansen.de> for the API updates and fixes.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <qcolor.h>
+#include <qpainter.h>
+#include <qbitmap.h>
+#include <qpixmap.h>
+
+#include "kshadowsettings.h"
+#include "kshadowengine.h"
+
+KShadowEngine::KShadowEngine() :
+ m_shadowSettings( new KShadowSettings )
+{
+}
+
+KShadowEngine::~KShadowEngine()
+{
+ delete m_shadowSettings;
+}
+
+KShadowEngine::KShadowEngine(KShadowSettings *fx) :
+ m_shadowSettings(0L)
+{
+ setShadowSettings(fx);
+}
+
+
+void KShadowEngine::setShadowSettings(KShadowSettings *fx)
+{
+ delete m_shadowSettings;
+
+ m_shadowSettings = fx;
+}
+
+KShadowSettings *KShadowEngine::shadowSettings()
+{
+ return m_shadowSettings;
+}
+
+QImage KShadowEngine::makeShadow(const QPixmap& textPixmap, const QColor &bgColor)
+{
+ QImage 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();
+
+ int thick = m_shadowSettings->thickness() >> 1;
+
+ double alphaShadow;
+
+ /*
+ * This is the source pixmap
+ */
+ QImage 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 = thick; i < w - thick; i++)
+ {
+ for (int j = thick; j < h - thick; j++)
+ {
+ switch (m_shadowSettings->algorithm())
+ {
+ case KShadowSettings::DoubleLinearDecay:
+ alphaShadow = doubleLinearDecay(img, i, j);
+ break;
+ case KShadowSettings::RadialDecay:
+ alphaShadow = radialDecay(img, i, j);
+ break;
+ case KShadowSettings::NoDecay:
+ alphaShadow = noDecay(img, i, j);
+ break;
+ case KShadowSettings::DefaultDecay:
+ default:
+ alphaShadow = defaultDecay(img, i, j);
+ }
+
+ alphaShadow = (alphaShadow > m_shadowSettings->maxOpacity()) ? m_shadowSettings->maxOpacity() : alphaShadow;
+
+ // update the shadow's i,j pixel.
+ result.setPixel(i,j, qRgba(bgRed, bgGreen , bgBlue, (int) alphaShadow));
+ }
+ }
+ return result;
+}
+
+// Multiplication factor for pixels directly above, under, or next to the text
+#define AXIS_FACTOR 2.0
+// Multiplication factor for pixels diagonal to the text
+#define DIAGONAL_FACTOR 1.0
+
+double KShadowEngine::defaultDecay(QImage& source, int i, int j)
+{
+ if ((i < 1) || (j < 1) || (i > source.width() - 2) || (j > source.height() - 2))
+ return 0;
+
+ double alphaShadow;
+ alphaShadow =(qGray(source.pixel(i-1,j-1)) * DIAGONAL_FACTOR +
+ qGray(source.pixel(i-1,j )) * AXIS_FACTOR +
+ qGray(source.pixel(i-1,j+1)) * DIAGONAL_FACTOR +
+ qGray(source.pixel(i ,j-1)) * AXIS_FACTOR +
+ 0 +
+ qGray(source.pixel(i ,j+1)) * AXIS_FACTOR +
+ qGray(source.pixel(i+1,j-1)) * DIAGONAL_FACTOR +
+ qGray(source.pixel(i+1,j )) * AXIS_FACTOR +
+ qGray(source.pixel(i+1,j+1)) * DIAGONAL_FACTOR) / m_shadowSettings->multiplicationFactor();
+
+ return alphaShadow;
+}
+
+double KShadowEngine::doubleLinearDecay(QImage& source, int i, int j)
+{
+ //printf("img: %p, %d %d\n", (char *) &source, i, j);
+ return defaultDecay( source, i, j ); // for now
+}
+
+double KShadowEngine::radialDecay(QImage& source, int i, int j)
+{
+ //printf("img: %p, %d %d\n", (char *) &source, i, j);
+ return defaultDecay( source, i, j ); // for now
+}
+
+double KShadowEngine::noDecay(QImage& source, int i, int j)
+{
+ // create a new image for for the shaddow
+ int w = source.width();
+ int h = source.height();
+ int sx, sy;
+ //int thick = m_shadowSettings->thickness() >> 1;
+
+ double alphaShadow = 0;
+ double opacity = 0;
+ for (int k = 1; k <= m_shadowSettings->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 += qGray(source.pixel(sx, sy));
+ }
+ }
+ alphaShadow += opacity / m_shadowSettings->multiplicationFactor();
+ }
+ return alphaShadow;
+}
+
+KTextShadowEngine::KTextShadowEngine() : KShadowEngine()
+{
+ KShadowSettings *shadset = new KShadowSettings();
+
+ shadset->setOffsetX(0);
+ shadset->setOffsetY(0);
+ shadset->setThickness(1);
+ shadset->setMaxOpacity(96);
+
+ setShadowSettings(shadset);
+}
+
+// taken from mtaskbar, by Sebastian Wolff
+void KTextShadowEngine::drawText(QPainter &p, const QRect &tr, int tf, const QString &str, const QSize &size)
+{
+ // get the color of the shadow: white for dark text, black for bright text
+ QPen textPen = p.pen();
+ QColor shadCol = textPen.color();
+
+ if (shadCol.red() +
+ shadCol.green() +
+ shadCol.blue() <= 3*256/2-1)
+ {
+ shadCol = QColor(255,255,255);
+ }
+ else
+ {
+ shadCol = QColor(0,0,0);
+ }
+
+ // get a transparent pixmap
+ QPainter pixPainter;
+ QPixmap textPixmap(size);
+
+ textPixmap.fill(QColor(0,0,0));
+ textPixmap.setMask(textPixmap.createHeuristicMask(true));
+
+ // draw text
+ pixPainter.begin(&textPixmap);
+ pixPainter.setPen(Qt::white);
+ pixPainter.setFont(p.font()); // get the font from the root painter
+ pixPainter.drawText(tr, tf, str);
+ pixPainter.end();
+
+ // draw shadow
+ QImage img = makeShadow(textPixmap, shadCol);
+
+ // return
+ p.drawImage(0, 0, img);
+ p.drawText(tr, tf, str);
+}
+
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-21 09:49:15 +0000