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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "Pixel32.h"
#include "../base/Exception.h"
#include <string>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <stdio.h>
namespace avg {
using namespace std;
void Pixel32::toHSL(float& h, float& s, float& l)
{
float r = float(m_Data[REDPOS])/255.f;
float g = float(m_Data[GREENPOS])/255.f;
float b = float(m_Data[BLUEPOS])/255.f;
float maxComp = max(r, max(g, b));
float minComp = min(r, min(g, b));
l = (maxComp+minComp)/2;
if (maxComp == minComp) {
s = 0;
h = 0;
} else {
float delta = maxComp-minComp;
if (l < 0.5f) {
s = delta/(maxComp+minComp);
} else {
s = delta/(2-(maxComp+minComp));
}
if (r > g && r > b) {
h = (g-b)/delta;
if (h < 0.0f) {
h += 6;
}
} else if (g > b) {
h = 2+(b-r)/delta;
} else {
h = 4+(r-g)/delta;
}
h *= 60;
}
}
std::string Pixel32::getColorString() const
{
stringstream s;
s.fill('0');
s << hex << setw(2) << (int)(m_Data[0]) << setw(2) << (int)(m_Data[1]) <<
setw(2) << (int)(m_Data[2]) << setw(2) << (int)(m_Data[3]);
return s.str();
}
Pixel32 colorStringToColor(const UTF8String& s)
{
int r, g, b;
int numChars;
int numItems = sscanf(s.c_str(), "%2x%2x%2x%n", &r, &g, &b, &numChars);
if (s.length() != 6 || numChars != 6 || numItems != 3) {
throw(Exception (AVG_ERR_INVALID_ARGS, "colorstring cannot be parsed."));
}
return Pixel32(r, g, b);
}
void YUVtoBGR32Pixel(Pixel32* pDest, int y, int u, int v)
{
// u = Cb, v = Cr
int u1 = u - 128;
int v1 = v - 128;
int tempy = 298*(y-16);
int b = (tempy + 516 * u1 ) >> 8;
int g = (tempy - 100 * u1 - 208 * v1) >> 8;
int r = (tempy + 409 * v1) >> 8;
if (b<0) b = 0;
if (b>255) b= 255;
if (g<0) g = 0;
if (g>255) g= 255;
if (r<0) r = 0;
if (r>255) r= 255;
pDest->set(b,g,r,255);
}
void YUVJtoBGR32Pixel(Pixel32* pDest, int y, int u, int v)
{
// u = Cb, v = Cr
int u1 = u - 128;
int v1 = v - 128;
int tempy = 256*y;
int b = (tempy + 452 * u1 ) >> 8;
int g = (tempy - 88 * u1 - 182 * v1) >> 8;
int r = (tempy + 358 * v1) >> 8;
if (b<0) b = 0;
if (b>255) b= 255;
if (g<0) g = 0;
if (g>255) g= 255;
if (r<0) r = 0;
if (r>255) r= 255;
pDest->set(b,g,r,255);
}
std::ostream& operator <<(std::ostream& os, const Pixel32& pix)
{
os << pix.getColorString();
return os;
}
}
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