kis_u16_base_colorspace.cpp

/*
 *  Copyright (c) 2005 Boudewijn Rempt <boud@valdyas.org>
 *
 *  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 of the License, 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
#include "kdebug.h"
 
#include "kis_global.h"
#include "kis_abstract_colorspace.h"
#include "kis_integer_maths.h"
#include "kis_u16_base_colorspace.h"
 
 
TQ_UINT8 KisU16BaseColorSpace::getAlpha(const TQ_UINT8 * U8_pixel) const
{
    if (m_alphaPos < 0) return OPACITY_OPAQUE;
 
    U8_pixel+= m_alphaPos;
 
    const TQ_UINT16 *pixel = reinterpret_cast<const TQ_UINT16 *>(U8_pixel);
    return UINT16_TO_UINT8(*pixel);
}
 
 
void KisU16BaseColorSpace::setAlpha(TQ_UINT8 *U8_pixel, TQ_UINT8 alpha, TQ_INT32 nPixels) const
{
    if (m_alphaPos < 0) return;
    TQ_INT32 psize = pixelSize();
 
 
    while (nPixels > 0) {
 
        TQ_UINT16 *pixel = reinterpret_cast<TQ_UINT16 *>(U8_pixel + m_alphaPos);
        pixel[0] = UINT8_TO_UINT16(alpha);
 
        --nPixels;
        U8_pixel += psize;
    }
}
 
void KisU16BaseColorSpace::multiplyAlpha(TQ_UINT8 *U8_pixel, TQ_UINT8 U8_alpha, TQ_INT32 nPixels)
{
    if (m_alphaPos < 0) return;
 
    TQ_INT32 psize = pixelSize();
    TQ_UINT16 alpha = UINT8_TO_UINT16(U8_alpha);
 
    while (nPixels > 0) {
 
        TQ_UINT16 *pixelAlpha = reinterpret_cast<TQ_UINT16 *>(U8_pixel + m_alphaPos);
        *pixelAlpha = UINT16_MULT(*pixelAlpha, alpha);
 
        --nPixels;
        U8_pixel += psize;
    }
}
 
void KisU16BaseColorSpace::applyAlphaU8Mask(TQ_UINT8 * U8_pixel, TQ_UINT8 * alpha8, TQ_INT32 nPixels)
{
    if (m_alphaPos < 0) return;
 
    TQ_INT32 psize = pixelSize();
 
    while (nPixels--) {
 
        // Go to the alpha position (which is given in bytes from the start of the pixel,
        // and cast to short.
 
        TQ_UINT16 *pixelAlpha = reinterpret_cast<TQ_UINT16 *>(U8_pixel + m_alphaPos);
        *pixelAlpha = UINT8_MULT(*pixelAlpha, *alpha8);
 
        ++alpha8;
        U8_pixel += psize;
 
    }
}
 
void KisU16BaseColorSpace::applyInverseAlphaU8Mask(TQ_UINT8 * U8_pixels, TQ_UINT8 * alpha8, TQ_INT32 nPixels)
{
 
    if (m_alphaPos < 0) return;
 
    TQ_INT32 psize = pixelSize();
 
 
    while(nPixels--) {
 
            TQ_UINT16 s_alpha8;
            TQ_UINT32 p_alpha, s_alpha16;
 
            TQ_UINT16 *alpha = reinterpret_cast<TQ_UINT16 *>(U8_pixels + m_alphaPos);
 
            p_alpha = *(alpha);
            s_alpha8 = MAX_SELECTED - *alpha8;
            s_alpha16 = UINT8_TO_UINT16(s_alpha8);
 
            // Go to the alpha position (which is given in bytes from the start of the pixel,
            // and cast to short.
 
            alpha[0] = UINT16_MULT(p_alpha, s_alpha16);
 
            U8_pixels += psize;
            ++alpha8;
    }
}
 
TQString KisU16BaseColorSpace::channelValueText(const TQ_UINT8 *U8_pixel, TQ_UINT32 channelIndex) const
{
    Q_ASSERT(channelIndex < (TQ_UINT32)nChannels());
    const TQ_UINT16 *pixel = reinterpret_cast<const TQ_UINT16 *>(U8_pixel);
    TQ_UINT32 channelPosition = channels()[channelIndex]->pos() / sizeof(TQ_UINT16);
 
    return TQString().setNum(pixel[channelPosition]);
}
 
TQString KisU16BaseColorSpace::normalisedChannelValueText(const TQ_UINT8 *U8_pixel, TQ_UINT32 channelIndex) const
{
    Q_ASSERT(channelIndex < (TQ_UINT32)nChannels());
    const TQ_UINT16 *pixel = reinterpret_cast<const TQ_UINT16 *>(U8_pixel);
    TQ_UINT32 channelPosition = m_channels[channelIndex]->pos() / sizeof(TQ_UINT16);
 
    return TQString().setNum(100.0 * static_cast<float>(pixel[channelPosition]) / UINT16_MAX);
}
 
TQ_UINT8 KisU16BaseColorSpace::scaleToU8(const TQ_UINT8 * U8_pixel, TQ_INT32 channelPos)
{
    const TQ_UINT16 *pixel = reinterpret_cast<const TQ_UINT16 *>(U8_pixel);
    return UINT16_TO_UINT8(pixel[channelPos]);
}
 
TQ_UINT16 KisU16BaseColorSpace::scaleToU16(const TQ_UINT8 * U8_pixel, TQ_INT32 channelPos)
{
    const TQ_UINT16 *pixel = reinterpret_cast<const TQ_UINT16 *>(U8_pixel);
    return pixel[channelPos];
}