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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-03-06
* Description : Hue/Saturation/Lightness image filter.
*
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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.
*
* ============================================================ */
#define CLAMP(x,l,u) ((x)<(l)?(l):((x)>(u)?(u):(x)))
#define CLAMP_0_255(x) TQMAX(TQMIN(x, 255), 0)
#define CLAMP_0_65535(x) TQMAX(TQMIN(x, 65535), 0)
// C++ includes.
#include <cstdio>
#include <cmath>
// Local includes.
#include "ddebug.h"
#include "dcolor.h"
#include "dimg.h"
#include "hslmodifier.h"
namespace Digikam
{
class HSLModifierPriv
{
public:
HSLModifierPriv()
{
modified = false;
}
bool modified;
int htransfer[256];
int ltransfer[256];
int stransfer[256];
int htransfer16[65536];
int ltransfer16[65536];
int stransfer16[65536];
};
HSLModifier::HSLModifier()
{
d = new HSLModifierPriv;
reset();
}
HSLModifier::~HSLModifier()
{
delete d;
}
bool HSLModifier::modified() const
{
return d->modified;
}
void HSLModifier::reset()
{
// initialize to linear mapping
for (int i=0; i<65536; i++)
{
d->htransfer16[i] = i;
d->ltransfer16[i] = i;
d->stransfer16[i] = i;
}
for (int i=0; i<256; i++)
{
d->htransfer[i] = i;
d->ltransfer[i] = i;
d->stransfer[i] = i;
}
d->modified = false;
}
void HSLModifier::applyHSL(DImg& image)
{
if (!d->modified || image.isNull())
return;
bool sixteenBit = image.sixteenBit();
uint numberOfPixels = image.numPixels();
if (sixteenBit) // 16 bits image.
{
unsigned short* data = (unsigned short*) image.bits();
for (uint i=0; i<numberOfPixels; i++)
{
int hue, sat, lig;
DColor color(data[2], data[1], data[0], 0, sixteenBit);
// convert RGB to HSL
color.getHSL(&hue, &sat, &lig);
// convert HSL to RGB
color.setRGB(d->htransfer16[hue], d->stransfer16[sat], d->ltransfer16[lig], sixteenBit);
data[2] = color.red();
data[1] = color.green();
data[0] = color.blue();
data += 4;
}
}
else // 8 bits image.
{
uchar* data = image.bits();
for (uint i=0; i<numberOfPixels; i++)
{
int hue, sat, lig;
DColor color(data[2], data[1], data[0], 0, sixteenBit);
// convert RGB to HSL
color.getHSL(&hue, &sat, &lig);
// convert HSL to RGB
color.setRGB(d->htransfer[hue], d->stransfer[sat], d->ltransfer[lig], sixteenBit);
data[2] = color.red();
data[1] = color.green();
data[0] = color.blue();
data += 4;
}
}
}
void HSLModifier::setHue(double val)
{
int value;
for (int i = 0; i < 65536; i++)
{
value = lround(val * 65535.0 / 360.0);
if ((i + value) < 0)
d->htransfer16[i] = 65535 + (i + value);
else if ((i + value) > 65535)
d->htransfer16[i] = i + value - 65535;
else
d->htransfer16[i] = i + value;
}
for (int i = 0; i < 256; i++)
{
value = lround(val * 255.0 / 360.0);
if ((i + value) < 0)
d->htransfer[i] = 255 + (i + value);
else if ((i + value) > 255)
d->htransfer[i] = i + value - 255;
else
d->htransfer[i] = i + value;
}
d->modified = true;
}
void HSLModifier::setSaturation(double val)
{
val = CLAMP(val, -100.0, 100.0);
int value;
for (int i = 0; i < 65536; i++)
{
value = lround( (i * (100.0 + val)) / 100.0 );
d->stransfer16[i] = CLAMP_0_65535(value);
}
for (int i = 0; i < 256; i++)
{
value = lround( (i * (100.0 + val)) / 100.0 );
d->stransfer[i] = CLAMP_0_255(value);
}
d->modified = true;
}
void HSLModifier::setLightness(double val)
{
// val needs to be in that range so that the result is in the range 0..65535
val = CLAMP(val, -100.0, 100.0);
if (val < 0)
{
for (int i = 0; i < 65536; i++)
{
d->ltransfer16[i] = lround( (i * ( val + 100.0 )) / 100.0);
}
for (int i = 0; i < 256; i++)
{
d->ltransfer[i] = lround( (i * ( val + 100.0 )) / 100.0);
}
}
else
{
for (int i = 0; i < 65536; i++)
{
d->ltransfer16[i] = lround( i * ( 1.0 - val / 100.0 ) + 65535.0 / 100.0 * val );
}
for (int i = 0; i < 256; i++)
{
d->ltransfer[i] = lround( i * ( 1.0 - val / 100.0 ) + 255.0 / 100.0 * val );
}
}
d->modified = true;
}
} // NameSpace Digikam
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