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/*
* (C) 2016 see Authors.txt
*
* This file is part of MPC-HC.
*
* MPC-HC is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* MPC-HC 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "stdafx.h"
#include "ImageGrayer.h"
struct HLS {
double H, L, S;
HLS(const RGBQUAD& rgb) {
double R = rgb.rgbRed / 255.0;
double G = rgb.rgbGreen / 255.0;
double B = rgb.rgbBlue / 255.0;
double max = std::max({ R, G, B });
double min = std::min({ R, G, B });
L = (max + min) / 2.0;
if (max == min) {
S = H = 0.0;
} else {
double d = max - min;
S = (L < 0.5) ? (d / (max + min)) : (d / (2.0 - max - min));
if (R == max) {
H = (G - B) / d;
} else if (G == max) {
H = 2.0 + (B - R) / d;
} else { // if (B == max)
H = 4.0 + (R - G) / d;
}
H /= 6.0;
if (H < 0.0) {
H += 1.0;
}
}
}
RGBQUAD toRGBQUAD() {
RGBQUAD rgb;
rgb.rgbReserved = 255;
if (S == 0.0) {
rgb.rgbRed = rgb.rgbGreen = rgb.rgbBlue = BYTE(L * 255);
} else {
auto hue2rgb = [](double p, double q, double h) {
if (h < 0.0) {
h += 1.0;
} else if (h > 1.0) {
h -= 1.0;
}
if (h < 1.0 / 6.0) {
return p + (q - p) * 6.0 * h;
} else if (h < 0.5) {
return q;
} else if (h < 2.0 / 3.0) {
return p + (q - p) * (2.0 / 3.0 - h) * 6.0;
}
return p;
};
double q = (L < 0.5) ? (L * (1 + S)) : (L + S - L * S);
double p = 2 * L - q;
rgb.rgbRed = BYTE(hue2rgb(p, q, H + 1.0 / 3.0) * 255);
rgb.rgbGreen = BYTE(hue2rgb(p, q, H) * 255);
rgb.rgbBlue = BYTE(hue2rgb(p, q, H - 1.0 / 3.0) * 255);
}
return rgb;
}
};
bool ImageGrayer::Gray(const CImage& imgSource, CImage& imgDest)
{
// Only support 32-bit image for now
if (imgSource.GetBPP() != 32) {
return false;
}
imgDest.Destroy();
if (!imgDest.Create(imgSource.GetWidth(), imgSource.GetHeight(), imgSource.GetBPP())) {
return false;
}
BOOL bCopied = imgSource.BitBlt(imgDest.GetDC(), 0, 0);
imgDest.ReleaseDC();
if (!bCopied) {
return false;
}
auto adjustBrightness = [](BYTE c, double p) {
int cAdjusted;
if (c == 0 && p > 1.0) {
cAdjusted = std::lround((p - 1.0) * 255);
} else {
cAdjusted = std::lround(c * p);
}
return BYTE(std::min(cAdjusted, 255));
};
BYTE* bits = static_cast<BYTE*>(imgDest.GetBits());
for (int y = 0; y < imgDest.GetHeight(); y++, bits += imgDest.GetPitch()) {
RGBQUAD* p = reinterpret_cast<RGBQUAD*>(bits);
for (int x = 0; x < imgDest.GetWidth(); x++) {
HLS hls(p[x]);
hls.S = 0.0; // Make the color gray
RGBQUAD rgb = hls.toRGBQUAD();
p[x].rgbRed = BYTE(adjustBrightness(rgb.rgbRed, 1.5) * p[x].rgbReserved / 255);
p[x].rgbGreen = BYTE(adjustBrightness(rgb.rgbGreen, 1.5) * p[x].rgbReserved / 255);
p[x].rgbBlue = BYTE(adjustBrightness(rgb.rgbBlue, 1.5) * p[x].rgbReserved / 255);
}
}
return true;
}
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