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127 lines
3.3 KiB
127 lines
3.3 KiB
/* Copyright (C) 2005 Gerd Fleischer <gerdfleischer@web.de>
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* Copyright (C) 2003 by Sandro Giessl
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* based on the nice CVS KDesktop KShadowEngine class. thanks!
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* looking forward to see KShadowEngine in tdefx somewhen btw.. :)
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* ------------------------------------------------------------------------
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* these are the original copyright notes:
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* 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 St, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*/
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#include "shadow.h"
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#include <tqcolor.h>
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ShadowEngine::ShadowEngine()
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{
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thickness_ = 1;
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multiplicationFactor_ = 10.0;
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}
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ShadowEngine::~ShadowEngine()
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{
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}
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TQImage ShadowEngine::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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float alphaShadow;
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/*
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* This is the source pixmap
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*/
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TQImage img = 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 = thickness_; i < w - thickness_; i++)
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{
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for (int j = thickness_; j < h - thickness_; j++)
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{
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alphaShadow = decay(img, i, j);
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alphaShadow = (alphaShadow > 180.0) ? 180.0 : 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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float ShadowEngine::decay(TQImage& source, int i, int j)
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{
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// create a new image for the shadow
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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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float alphaShadow = 0;
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float opacity = 0;
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for (int k = 1; k <= 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 / multiplicationFactor_;
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}
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return alphaShadow;
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}
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