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209 lines
4.8 KiB
209 lines
4.8 KiB
/* ============================================================
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*
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* This file is a part of digiKam project
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* http://www.digikam.org
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*
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* Date : 2005-03-06
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* Description : a Brightness/Contrast/Gamma image filter.
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*
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* Copyright (C) 2005 by Renchi Raju <renchi@pooh.tam.uiuc.edu>
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* Copyright (C) 2005-2008 by Gilles Caulier <caulier dot gilles at gmail dot com>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software Foundation;
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* either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ============================================================ */
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#define CLAMP_0_255(x) TQMAX(TQMIN(x, 255), 0)
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#define CLAMP_0_65535(x) TQMAX(TQMIN(x, 65535), 0)
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// C++ includes.
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#include <cstdio>
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#include <cmath>
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// Local includes.
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#include "dimg.h"
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#include "bcgmodifier.h"
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namespace Digikam
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{
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class BCGModifierPriv
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{
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public:
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BCGModifierPriv()
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{
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channel = BCGModifier::CHANNEL_ALL;
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modified = false;
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}
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bool modified;
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int channel;
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int map16[65536];
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int map[256];
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};
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BCGModifier::BCGModifier()
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{
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d = new BCGModifierPriv;
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reset();
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}
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BCGModifier::~BCGModifier()
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{
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delete d;
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}
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bool BCGModifier::modified() const
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{
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return d->modified;
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}
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void BCGModifier::reset()
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{
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// initialize to linear mapping
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for (int i=0; i<65536; i++)
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d->map16[i] = i;
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for (int i=0; i<256; i++)
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d->map[i] = i;
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d->modified = false;
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}
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void BCGModifier::applyBCG(DImg& image)
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{
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if (!d->modified || image.isNull())
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return;
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applyBCG(image.bits(), image.width(), image.height(), image.sixteenBit());
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}
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void BCGModifier::applyBCG(uchar *bits, uint width, uint height, bool sixteenBits)
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{
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if (!d->modified || !bits)
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return;
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uint size = width*height;
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if (!sixteenBits) // 8 bits image.
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{
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uchar* data = bits;
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for (uint i=0; i<size; i++)
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{
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switch (d->channel)
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{
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case CHANNEL_BLUE:
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data[0] = CLAMP_0_255(d->map[data[0]]);
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break;
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case CHANNEL_GREEN:
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data[1] = CLAMP_0_255(d->map[data[1]]);
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break;
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case CHANNEL_RED:
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data[2] = CLAMP_0_255(d->map[data[2]]);
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break;
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default: // CHANNEL_ALL
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data[0] = CLAMP_0_255(d->map[data[0]]);
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data[1] = CLAMP_0_255(d->map[data[1]]);
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data[2] = CLAMP_0_255(d->map[data[2]]);
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break;
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}
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data += 4;
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}
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}
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else // 16 bits image.
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{
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ushort* data = (ushort*)bits;
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for (uint i=0; i<size; i++)
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{
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switch (d->channel)
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{
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case CHANNEL_BLUE:
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data[0] = CLAMP_0_65535(d->map16[data[0]]);
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break;
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case CHANNEL_GREEN:
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data[1] = CLAMP_0_65535(d->map16[data[1]]);
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break;
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case CHANNEL_RED:
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data[2] = CLAMP_0_65535(d->map16[data[2]]);
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break;
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default: // CHANNEL_ALL
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data[0] = CLAMP_0_65535(d->map16[data[0]]);
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data[1] = CLAMP_0_65535(d->map16[data[1]]);
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data[2] = CLAMP_0_65535(d->map16[data[2]]);
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break;
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}
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data += 4;
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}
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}
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}
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void BCGModifier::setChannel(int channel)
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{
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d->channel = channel;
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}
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void BCGModifier::setGamma(double val)
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{
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val = (val < 0.01) ? 0.01 : val;
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for (int i=0; i<65536; i++)
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d->map16[i] = lround(pow(((double)d->map16[i] / 65535.0), (1.0 / val)) * 65535.0);
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for (int i=0; i<256; i++)
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d->map[i] = lround(pow(((double)d->map[i] / 255.0), (1.0 / val)) * 255.0);
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d->modified = true;
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}
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void BCGModifier::setBrightness(double val)
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{
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int val1 = lround(val * 65535);
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for (int i = 0; i < 65536; i++)
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d->map16[i] = d->map16[i] + val1;
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val1 = lround(val * 255);
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for (int i = 0; i < 256; i++)
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d->map[i] = d->map[i] + val1;
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d->modified = true;
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}
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void BCGModifier::setContrast(double val)
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{
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for (int i = 0; i < 65536; i++)
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d->map16[i] = lround((d->map16[i] - 32767) * val) + 32767;
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for (int i = 0; i < 256; i++)
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d->map[i] = lround((d->map[i] - 127) * val) + 127;
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d->modified = true;
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}
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} // NameSpace Digikam
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