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0001 0002 /* 0003 Copyright (c) 2003-2007 Clarence Dang <dang@kde.org> 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 0029 #define DEBUG_KP_EFFECT_BALANCE 0 0030 0031 0032 #include "kpEffectBalance.h" 0033 0034 #include <cmath> 0035 0036 #include <QImage> 0037 0038 #include "kpLogCategories.h" 0039 0040 #include "pixmapfx/kpPixmapFX.h" 0041 0042 0043 #if DEBUG_KP_EFFECT_BALANCE 0044 #include <qdatetime.h> 0045 #endif 0046 0047 0048 static inline int between0And255 (int val) 0049 { 0050 if (val < 0) { 0051 return 0; 0052 } 0053 0054 if (val > 255) { 0055 return 255; 0056 } 0057 0058 return val; 0059 } 0060 0061 0062 static inline int brightness (int base, int strength) 0063 { 0064 return between0And255 (base + strength * 255 / 50); 0065 } 0066 0067 static inline int contrast (int base, int strength) 0068 { 0069 return between0And255 ((base - 127) * (strength + 50) / 50 + 127); 0070 } 0071 0072 static inline int gamma (int base, int strength) 0073 { 0074 return between0And255 (qRound (255.0 * std::pow (base / 255.0, 1.0 / std::pow (10., strength / 50.0)))); 0075 } 0076 0077 0078 static inline int brightnessContrastGamma (int base, 0079 int newBrightness, 0080 int newContrast, 0081 int newGamma) 0082 { 0083 return gamma (contrast (brightness (base, newBrightness), 0084 newContrast), 0085 newGamma); 0086 } 0087 0088 // public static 0089 kpImage kpEffectBalance::applyEffect (const kpImage &image, 0090 int channels, 0091 int brightness, int contrast, int gamma) 0092 { 0093 #if DEBUG_KP_EFFECT_BALANCE 0094 qCDebug(kpLogImagelib) << "kpEffectBalance::applyEffect(" 0095 << "channels=" << channels 0096 << ",brightness=" << brightness 0097 << ",contrast=" << contrast 0098 << ",gamma=" << gamma 0099 << ")"; 0100 QTime timer; timer.start (); 0101 #endif 0102 0103 QImage qimage = image; 0104 #if DEBUG_KP_EFFECT_BALANCE 0105 qCDebug(kpLogImagelib) << "\tconvertToImage=" << timer.restart (); 0106 #endif 0107 0108 0109 quint8 transformRed [256], 0110 transformGreen [256], 0111 transformBlue [256]; 0112 0113 for (int i = 0; i < 256; i++) 0114 { 0115 auto applied = static_cast<quint8> (brightnessContrastGamma (i, brightness, contrast, gamma)); 0116 0117 if (channels & kpEffectBalance::Red) { 0118 transformRed [i] = applied; 0119 } 0120 else { 0121 transformRed [i] = static_cast<quint8> (i); 0122 } 0123 0124 if (channels & kpEffectBalance::Green) { 0125 transformGreen [i] = applied; 0126 } 0127 else { 0128 transformGreen [i] = static_cast<quint8> (i); 0129 } 0130 0131 if (channels & kpEffectBalance::Blue) { 0132 transformBlue [i] = applied; 0133 } 0134 else { 0135 transformBlue [i] = static_cast<quint8> (i); 0136 } 0137 } 0138 0139 #if DEBUG_KP_EFFECT_BALANCE 0140 qCDebug(kpLogImagelib) << "\tbuild lookup=" << timer.restart (); 0141 #endif 0142 0143 0144 if (qimage.depth () > 8) 0145 { 0146 for (int y = 0; y < qimage.height (); y++) 0147 { 0148 for (int x = 0; x < qimage.width (); x++) 0149 { 0150 const QRgb rgb = qimage.pixel (x, y); 0151 0152 const auto red = static_cast<quint8> (qRed (rgb)); 0153 const auto green = static_cast<quint8> (qGreen (rgb)); 0154 const auto blue = static_cast<quint8> (qBlue (rgb)); 0155 const auto alpha = static_cast<quint8> (qAlpha (rgb)); 0156 0157 qimage.setPixel (x, y, 0158 qRgba (transformRed [red], 0159 transformGreen [green], 0160 transformBlue [blue], 0161 alpha)); 0162 } 0163 } 0164 } 0165 else 0166 { 0167 for (int i = 0; i < qimage.colorCount (); i++) 0168 { 0169 const QRgb rgb = qimage.color (i); 0170 0171 const auto red = static_cast<quint8> (qRed (rgb)); 0172 const auto green = static_cast<quint8> (qGreen (rgb)); 0173 const auto blue = static_cast<quint8> (qBlue (rgb)); 0174 const auto alpha = static_cast<quint8> (qAlpha (rgb)); 0175 0176 qimage.setColor (i, 0177 qRgba (transformRed [red], 0178 transformGreen [green], 0179 transformBlue [blue], 0180 alpha)); 0181 } 0182 0183 } 0184 0185 return qimage; 0186 } 0187