File indexing completed on 2024-05-19 04:22:56
0001 0002 /* 0003 Copyright (c) 2007 Mike Gashler <gashlerm@yahoo.com> 0004 All rights reserved. 0005 0006 Redistribution and use in source and binary forms, with or without 0007 modification, are permitted provided that the following conditions 0008 are met: 0009 0010 1. Redistributions of source code must retain the above copyright 0011 notice, this list of conditions and the following disclaimer. 0012 2. Redistributions in binary form must reproduce the above copyright 0013 notice, this list of conditions and the following disclaimer in the 0014 documentation and/or other materials provided with the distribution. 0015 0016 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 0017 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 0018 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 0019 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 0020 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 0021 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 0022 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 0023 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 0024 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 0025 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 0026 */ 0027 0028 // TODO: Clarence's code review 0029 0030 #include "kpEffectHSV.h" 0031 0032 #include <cmath> 0033 0034 #include <QImage> 0035 0036 #include "kpLogCategories.h" 0037 0038 #include "pixmapfx/kpPixmapFX.h" 0039 0040 0041 static void ColorToHSV(unsigned int c, float* pHue, float* pSaturation, float* pValue) 0042 { 0043 int r = qRed(c); 0044 int g = qGreen(c); 0045 int b = qBlue(c); 0046 int min{}; 0047 if(b >= g && b >= r) 0048 { 0049 // Blue 0050 min = qMin(r, g); 0051 if(b != min) 0052 { 0053 *pHue = static_cast<float> (r - g) / ((b - min) * 6) + static_cast<float> (2) / 3; 0054 *pSaturation = 1.0f - static_cast<float> (min) / static_cast<float> (b); 0055 } 0056 else 0057 { 0058 *pHue = 0; 0059 *pSaturation = 0; 0060 } 0061 *pValue = static_cast<float> (b) / 255; 0062 } 0063 else if(g >= r) 0064 { 0065 // Green 0066 min = qMin(b, r); 0067 if(g != min) 0068 { 0069 *pHue = static_cast<float> (b - r) / ((g - min) * 6) + static_cast<float> (1) / 3; 0070 *pSaturation = 1.0f - static_cast<float> (min) / static_cast<float> (g); 0071 } 0072 else 0073 { 0074 *pHue = 0; 0075 *pSaturation = 0; 0076 } 0077 *pValue = static_cast<float> (g) / 255; 0078 } 0079 else 0080 { 0081 // Red 0082 min = qMin(g, b); 0083 if(r != min) 0084 { 0085 *pHue = static_cast<float> (g - b) / ((r - min) * 6); 0086 if(*pHue < 0) { 0087 (*pHue) += 1.0f; 0088 } 0089 *pSaturation = 1.0f - static_cast<float> (min) / static_cast<float> (r); 0090 } 0091 else 0092 { 0093 *pHue = 0; 0094 *pSaturation = 0; 0095 } 0096 *pValue = static_cast<float> (r) / 255; 0097 } 0098 } 0099 0100 static unsigned int HSVToColor(int alpha, float hue, float saturation, float value) 0101 { 0102 hue *= 5.999999f; 0103 int h = static_cast<int> (hue); 0104 float f = hue - h; 0105 float p = value * (1.0 - saturation); 0106 float q = value * (1.0 - ((h & 1) == 0 ? 1.0 - f : f) * saturation); 0107 switch(h) 0108 { 0109 case 0: return qRgba(static_cast<int> (value * 255.999999), 0110 static_cast<int> (q * 255.999999), 0111 static_cast<int> (p * 255.999999), alpha); 0112 0113 case 1: return qRgba(static_cast<int> (q * 255.999999), 0114 static_cast<int> (value * 255.999999), 0115 static_cast<int> (p * 255.999999), alpha); 0116 0117 case 2: return qRgba(static_cast<int> (p * 255.999999), 0118 static_cast<int> (value * 255.999999), 0119 static_cast<int> (q * 255.999999), alpha); 0120 0121 case 3: return qRgba(static_cast<int> (p * 255.999999), 0122 static_cast<int> (q * 255.999999), 0123 static_cast<int> (value * 255.999999), alpha); 0124 0125 case 4: return qRgba(static_cast<int> (q * 255.999999), 0126 static_cast<int> (p * 255.999999), 0127 static_cast<int> (value * 255.999999), alpha); 0128 0129 case 5: return qRgba(static_cast<int> (value * 255.999999), 0130 static_cast<int> (p * 255.999999), 0131 static_cast<int> (q * 255.999999), alpha); 0132 } 0133 return qRgba(0, 0, 0, alpha); 0134 } 0135 0136 static QRgb AdjustHSVInternal (QRgb pix, double hueDiv360, double saturation, double value) 0137 { 0138 float h, s, v; 0139 ::ColorToHSV(pix, &h, &s, &v); 0140 0141 const int alpha = qAlpha(pix); 0142 0143 h += static_cast<float> (hueDiv360); 0144 h -= std::floor(h); 0145 0146 s = qMax(0.0f, qMin(static_cast<float>(1), s + static_cast<float> (saturation))); 0147 0148 v = qMax(0.0f, qMin(static_cast<float>(1), v + static_cast<float> (value))); 0149 0150 return ::HSVToColor(alpha, h, s, v); 0151 } 0152 0153 static void AdjustHSV (QImage* pImage, double hue, double saturation, double value) 0154 { 0155 hue /= 360; 0156 0157 if (pImage->depth () > 8) 0158 { 0159 for (int y = 0; y < pImage->height (); y++) 0160 { 0161 for (int x = 0; x < pImage->width (); x++) 0162 { 0163 QRgb pix = pImage->pixel (x, y); 0164 pix = ::AdjustHSVInternal (pix, hue, saturation, value); 0165 pImage->setPixel (x, y, pix); 0166 } 0167 } 0168 } 0169 else 0170 { 0171 for (int i = 0; i < pImage->colorCount (); i++) 0172 { 0173 QRgb pix = pImage->color (i); 0174 pix = ::AdjustHSVInternal (pix, hue, saturation, value); 0175 pImage->setColor (i, pix); 0176 } 0177 } 0178 } 0179 0180 // public static 0181 kpImage kpEffectHSV::applyEffect (const kpImage &image, 0182 double hue, double saturation, double value) 0183 { 0184 QImage qimage(image); 0185 ::AdjustHSV (&qimage, hue, saturation, value); 0186 return qimage; 0187 } 0188