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59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
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// Copyright 2008-2009 by Benoît Jacob <jacob.benoit.1@gmail.com>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License or (at your option) version 3 or any later version
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// accepted by the membership of KDE e.V. (or its successor approved
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// by the membership of KDE e.V.), which shall act as a proxy
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// defined in Section 14 of version 3 of the license.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "mix.h"
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/** \returns a RGB mix two floating-point colors of which both RGB and HSV representations are known. The coefficient s is in the range [0,1].
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*/
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Color3 mix(const Color3& a_rgb, const Color3& a_hsv, const Color3& b_rgb, const Color3& b_hsv, qreal s)
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{
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if(a_hsv[2] < qreal(0.4) * b_hsv[2]
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|| b_hsv[2] < qreal(0.4) * a_hsv[2]
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|| a_hsv[1] < qreal(0.4) * b_hsv[1]
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|| b_hsv[1] < qreal(0.4) * a_hsv[1])
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{
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// prefer RGB mixing
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return a_rgb*s+b_rgb*(qreal(1)-s);
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}
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else
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{
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// prefer HSV mixing
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Color3 a_hsv_corrected = a_hsv;
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if(a_hsv_corrected[0] - b_hsv[0] > qreal(0.5)) a_hsv_corrected[0] -= qreal(1);
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if(a_hsv_corrected[0] - b_hsv[0] < qreal(-0.5)) a_hsv_corrected[0] += qreal(1);
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Color3 result_hsv = a_hsv_corrected*s + b_hsv*(qreal(1)-s);
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if(result_hsv[0]<qreal(0)) result_hsv[0]+=qreal(1);
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if(result_hsv[0]>qreal(1)) result_hsv[0]-=qreal(1);
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Color3 result_rgb;
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QColor::fromHsvF(result_hsv[0], result_hsv[1], result_hsv[2])
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.getRgbF(&result_rgb[0], &result_rgb[1], &result_rgb[2]);
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return result_rgb;
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}
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}
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unsigned char qreal_to_uchar_color_channel(qreal t)
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{
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qreal t_scaled = qreal(255)*t;
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qreal floor_t_scaled = std::floor(t_scaled);
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qreal probability_to_add_one = t_scaled - floor_t_scaled;
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// note: qrand() is thread-safe, std::rand() isn't.
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qreal result = floor_t_scaled + (qrand() < int(qreal(RAND_MAX)*probability_to_add_one) ? qreal(1) : qreal(0));
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int result_int_clamped = (int) CLAMP(result, qreal(0), qreal(255));
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return (unsigned char) result_int_clamped;
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}
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