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/*
* Copyright 2003, Sandro Giessl <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License version 2 as published by the Free Software Foundation.
*
* 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <qcolor.h>
#include "misc.h"
#include <qimage.h>
#include <qpixmap.h>
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#undef WORDS_BIGENDIAN
#define WORDS_LITTLEENDIAN 1
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
#undef WORDS_LITTLEENDIAN
#define WORDS_BIGENDIAN 1
#endif
QColor alphaBlendColors(const QColor &bgColor, const QColor &fgColor, const int a)
{
QRgb rgb = bgColor.rgb();
QRgb rgb_b = fgColor.rgb();
uint alpha;
if(a > 255) alpha = 255;
else if(a < 0) alpha = 0;
else alpha = a;
uint inv_alpha = 255 - alpha;
return QColor((qRed(rgb_b)*inv_alpha + qRed(rgb)*alpha)>>8,
(qGreen(rgb_b)*inv_alpha + qGreen(rgb)*alpha)>>8,
(qBlue(rgb_b)*inv_alpha + qBlue(rgb)*alpha)>>8 );
}
QColor blendColors(const QColor &bgColor, const QColor &fgColor)
{
uint fg_r = fgColor.red();
uint fg_g = fgColor.green();
uint fg_b = fgColor.blue();
uint fg_a = qAlpha(fgColor.rgb());
uint bg_r = bgColor.red();
uint bg_g = bgColor.green();
uint bg_b = bgColor.blue();
uint bg_a = qAlpha(bgColor.rgb());
uint ac = 65025 - (255 - fg_a) * (255 - bg_a);
uint res_r = ((255 - fg_a) * bg_r * bg_a + fg_a * fg_r * 255 + 127) / ac;
uint res_g = ((255 - fg_a) * bg_g * bg_a + fg_a * fg_g * 255 + 127) / ac;
uint res_b = ((255 - fg_a) * bg_b * bg_a + fg_a * fg_b * 255 + 127) / ac;
uint res_a = (ac+127)/255;
return QColor(qRgba(res_r,res_g, res_b, res_a ));
}
QImage tintImage(const QImage &img, const QColor &tintColor) {
QImage *result = new QImage(img.width(), img.height(), 32, 0, QImage::IgnoreEndian);
result->setAlphaBuffer( true );
register uint *data = (unsigned int*) img.bits();
register uint *resultData = (unsigned int*) result->bits();
register uint total = img.width()*img.height();
for ( uint current = 0 ; current < total ; ++current ) {
resultData[ current ] = qRgba( tintColor.red(), tintColor.green(), tintColor.blue(), qAlpha( data[ current ] ));
}
return *result;
}
QImage setImageOpacity(const QImage &img, const uint &p) {
QImage *result = new QImage(img.width(), img.height(), 32, 0, QImage::IgnoreEndian);
result->setAlphaBuffer( true );
register uint *data = (unsigned int*) img.bits();
register uint *resultData = (unsigned int*) result->bits();
register uint alpha;
register uint total = img.width()*img.height();
for ( uint current = 0 ; current < total ; ++current ) {
alpha = qAlpha( data[ current ] ) * p / 100;
resultData[ current ] = qRgba( qRed( data[ current ] ), qGreen( data[ current ] ), qBlue( data[ current ] ), alpha );
}
return *result;
}
bool blend( const QImage & upper, const QImage & lower, QImage & output)
// adopted from kimageeffect::blend - that is not endian safe and cannot handle complex alpha combinations...
{
if
(
upper.width() > lower.width() ||
upper.height() > lower.height() ||
upper.depth() != 32 ||
lower.depth() != 32
)
return false;
output = lower.copy();
uchar *i, *o;
register uint a, ab, ac;
register uint col;
register uint w = upper.width();
int row(upper.height() - 1);
do
{
i = upper.scanLine(row);
o = output.scanLine(row);
col = w << 2;
--col;
do
{
#ifdef WORDS_BIGENDIAN
while (!(a = i[col-3]) && (col != 3))
#else
while (!(a = i[col]) && (col != 3))
#endif
{
--col; --col; --col; --col;
}
#ifdef WORDS_BIGENDIAN
if ((ab = o[col-3]))
#else
if ((ab = o[col]))
#endif
{
ac = 65025 - (255 - a) * (255 - ab);
#ifndef WORDS_BIGENDIAN
o[col]= (ac+127)/255;
--col;
#endif
o[col] = ((255 - a) * o[col] * ab + a * i[col] * 255 + 127) / ac;
--col;
o[col] = ((255 - a) * o[col] * ab + a * i[col] * 255 + 127) / ac;
--col;
o[col] = ((255 - a) * o[col] * ab + a * i[col] * 255 + 127) / ac;
#ifdef WORDS_BIGENDIAN
--col;
o[col]= (ac+127)/255;
#endif
}
else
{
o[col] = i[col]; --col;
o[col] = i[col]; --col;
o[col] = i[col]; --col;
o[col] = i[col];
}
} while (col--);
} while (row--);
return true;
}
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