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145 lines
4.3 KiB
145 lines
4.3 KiB
/*
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* This file is part of the CSS implementation for KDE.
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*
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* Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
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* (C) David Carson <dacarson@gmail.com>
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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 as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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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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*/
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#include "helper.h"
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#include "tdehtmllayout.h"
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#include <tqmap.h>
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#include <tqpainter.h>
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#include <dom/dom_string.h>
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#include <xml/dom_stringimpl.h>
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#include <rendering/render_object.h>
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#include <tqptrlist.h>
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#include <kstaticdeleter.h>
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#include <tdeapplication.h>
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#include <tdeconfig.h>
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#include <tqtooltip.h>
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using namespace DOM;
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using namespace tdehtml;
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namespace tdehtml {
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TQPainter *printpainter;
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}
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void tdehtml::setPrintPainter( TQPainter *printer )
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{
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printpainter = printer;
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}
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double calcHue(double temp1, double temp2, double hueVal)
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{
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if (hueVal < 0)
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hueVal++;
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else if (hueVal > 1)
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hueVal--;
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if (hueVal * 6 < 1)
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return temp1 + (temp2 - temp1) * hueVal * 6;
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if (hueVal * 2 < 1)
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return temp2;
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if (hueVal * 3 < 2)
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return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hueVal) * 6;
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return temp1;
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}
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// Explanation of this algorithm can be found in the CSS3 Color Module
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// specification at http://www.w3.org/TR/css3-color/#hsl-color with further
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// explanation available at http://en.wikipedia.org/wiki/HSL_color_space
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// all values are in the range of 0 to 1.0
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TQRgb tdehtml::tqRgbaFromHsla(double h, double s, double l, double a)
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{
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double temp2 = l < 0.5 ? l * (1.0 + s) : l + s - l * s;
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double temp1 = 2.0 * l - temp2;
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return tqRgba(calcHue(temp1, temp2, h + 1.0 / 3.0) * 255, calcHue(temp1, temp2, h) * 255, calcHue(temp1, temp2, h - 1.0 / 3.0) * 255, a * 255);
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}
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/** finds out the background color of an element
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* @param obj render object
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* @return the background color. It is guaranteed that a valid color is returned.
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*/
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TQColor tdehtml::retrieveBackgroundColor(const RenderObject *obj)
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{
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TQColor result;
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while (!obj->isCanvas()) {
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result = obj->style()->backgroundColor();
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if (result.isValid()) return result;
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obj = obj->container();
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}/*wend*/
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// everything transparent? Use base then.
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return obj->style()->palette().active().base();
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}
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/** checks whether the given colors have enough contrast
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* @returns @p true if contrast is ok.
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*/
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bool tdehtml::hasSufficientContrast(const TQColor &c1, const TQColor &c2)
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{
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// New version from Germain Garand, better suited for contrast measurement
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#if 1
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#define HUE_DISTANCE 40
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#define CONTRAST_DISTANCE 10
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int h1, s1, v1, h2, s2, v2;
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int hdist = -CONTRAST_DISTANCE;
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c1.hsv(&h1,&s1,&v1);
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c2.hsv(&h2,&s2,&v2);
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if(h1!=-1 && h2!=-1) { // grey values have no hue
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hdist = kAbs(h1-h2);
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if (hdist > 180) hdist = 360-hdist;
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if (hdist < HUE_DISTANCE) {
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hdist -= HUE_DISTANCE;
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// see if they are high key or low key colours
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bool hk1 = h1>=45 && h1<=225;
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bool hk2 = h2>=45 && h2<=225;
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if (hk1 && hk2)
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hdist = (5*hdist)/3;
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else if (!hk1 && !hk2)
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hdist = (7*hdist)/4;
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}
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hdist = kMin(hdist, HUE_DISTANCE*2);
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}
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return hdist + (kAbs(s1-s2)*128)/(160+kMin(s1,s2)) + kAbs(v1-v2) > CONTRAST_DISTANCE;
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#undef CONTRAST_DISTANCE
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#undef HUE_DISTANCE
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#else // orginal fast but primitive version by me (LS)
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// ### arbitrary value, to be adapted if necessary (LS)
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#define CONTRAST_DISTANCE 32
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if (kAbs(c1.red() - c2.red()) > CONTRAST_DISTANCE) return true;
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if (kAbs(c1.green() - c2.green()) > CONTRAST_DISTANCE) return true;
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if (kAbs(c1.blue() - c2.blue()) > CONTRAST_DISTANCE) return true;
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return false;
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#undef CONTRAST_DISTANCE
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#endif
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}
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