From dfe289850f068f19ba4a83ab4e7e22a7e09c13c9 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sat, 26 Jan 2013 13:17:21 -0600 Subject: Rename a number of libraries and executables to avoid conflicts with KDE4 --- tdehtml/misc/helper.cpp | 144 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 tdehtml/misc/helper.cpp (limited to 'tdehtml/misc/helper.cpp') diff --git a/tdehtml/misc/helper.cpp b/tdehtml/misc/helper.cpp new file mode 100644 index 000000000..f759a9957 --- /dev/null +++ b/tdehtml/misc/helper.cpp @@ -0,0 +1,144 @@ +/* + * This file is part of the CSS implementation for KDE. + * + * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org) + * (C) David Carson + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * 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 "helper.h" +#include "tdehtmllayout.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +using namespace DOM; +using namespace tdehtml; + +namespace tdehtml { + TQPainter *printpainter; +} + +void tdehtml::setPrintPainter( TQPainter *printer ) +{ + printpainter = printer; +} + + +double calcHue(double temp1, double temp2, double hueVal) +{ + if (hueVal < 0) + hueVal++; + else if (hueVal > 1) + hueVal--; + if (hueVal * 6 < 1) + return temp1 + (temp2 - temp1) * hueVal * 6; + if (hueVal * 2 < 1) + return temp2; + if (hueVal * 3 < 2) + return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hueVal) * 6; + return temp1; +} + +// Explanation of this algorithm can be found in the CSS3 Color Module +// specification at http://www.w3.org/TR/css3-color/#hsl-color with further +// explanation available at http://en.wikipedia.org/wiki/HSL_color_space + +// all values are in the range of 0 to 1.0 +QRgb tdehtml::tqRgbaFromHsla(double h, double s, double l, double a) +{ + double temp2 = l < 0.5 ? l * (1.0 + s) : l + s - l * s; + double temp1 = 2.0 * l - temp2; + + 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); +} + +/** finds out the background color of an element + * @param obj render object + * @return the background color. It is guaranteed that a valid color is returned. + */ +TQColor tdehtml::retrieveBackgroundColor(const RenderObject *obj) +{ + TQColor result; + while (!obj->isCanvas()) { + result = obj->style()->backgroundColor(); + if (result.isValid()) return result; + + obj = obj->container(); + }/*wend*/ + + // everything transparent? Use base then. + return obj->style()->palette().active().base(); +} + +/** checks whether the given colors have enough contrast + * @returns @p true if contrast is ok. + */ +bool tdehtml::hasSufficientContrast(const TQColor &c1, const TQColor &c2) +{ +// New version from Germain Garand, better suited for contrast measurement +#if 1 + +#define HUE_DISTANCE 40 +#define CONTRAST_DISTANCE 10 + + int h1, s1, v1, h2, s2, v2; + int hdist = -CONTRAST_DISTANCE; + c1.hsv(&h1,&s1,&v1); + c2.hsv(&h2,&s2,&v2); + if(h1!=-1 && h2!=-1) { // grey values have no hue + hdist = kAbs(h1-h2); + if (hdist > 180) hdist = 360-hdist; + if (hdist < HUE_DISTANCE) { + hdist -= HUE_DISTANCE; + // see if they are high key or low key colours + bool hk1 = h1>=45 && h1<=225; + bool hk2 = h2>=45 && h2<=225; + if (hk1 && hk2) + hdist = (5*hdist)/3; + else if (!hk1 && !hk2) + hdist = (7*hdist)/4; + } + hdist = kMin(hdist, HUE_DISTANCE*2); + } + return hdist + (kAbs(s1-s2)*128)/(160+kMin(s1,s2)) + kAbs(v1-v2) > CONTRAST_DISTANCE; + +#undef CONTRAST_DISTANCE +#undef HUE_DISTANCE + +#else // orginal fast but primitive version by me (LS) + +// ### arbitrary value, to be adapted if necessary (LS) +#define CONTRAST_DISTANCE 32 + + if (kAbs(c1.red() - c2.red()) > CONTRAST_DISTANCE) return true; + if (kAbs(c1.green() - c2.green()) > CONTRAST_DISTANCE) return true; + if (kAbs(c1.blue() - c2.blue()) > CONTRAST_DISTANCE) return true; + + return false; + +#undef CONTRAST_DISTANCE + +#endif +} -- cgit v1.2.1