/*
* colors.cpp (C) 2006-2008, Aurélien Croc (AP²C)
*
* 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; version 2 of the License.
*
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id$
*
*/
#include "colors.h"
#include "page.h"
#ifndef DISABLE_BLACKOPTIM
void applyBlackOptimization(Page* page)
{
unsigned long size, sizeByUL, mod, mask;
unsigned char *planes[4], bmask;
// Only optimize colors if there are present
if (!page || page->colorsNr() != 4)
return;
for (unsigned int i=0; i < 4; i++) {
if (!(planes[i] = page->planeBuffer(i)))
return;
}
size = page->width() * page->height() / 8;
sizeByUL = size / sizeof(unsigned long);
mod = size % sizeof(unsigned long);
/*
* To optimize this algorithm, data are first evaluated by unsigned long
* (32-Bits on 32-Bits architecture and 64-Bits on 64-Bits architecture).
* The last bytes are evaluated individually if the size is not a multiple
* of the size of the unsigned long
*/
for (unsigned long i=0; i < sizeByUL; i++) {
// Clear cyan, magenta and yellow dots if a black dot is present
mask = ((unsigned long *)planes[3])[i];
if (mask) {
((unsigned long *)planes[0])[i] &= ~mask;
((unsigned long *)planes[1])[i] &= ~mask;
((unsigned long *)planes[2])[i] &= ~mask;
}
// Set a black dot if cyan, magenta and yellow dots are present and
// clear them
mask = ((unsigned long *)planes[0])[i];
mask &= ((unsigned long *)planes[1])[i];
mask &= ((unsigned long *)planes[2])[i];
if (mask) {
((unsigned long *)planes[3])[i] |= mask;
((unsigned long *)planes[0])[i] &= ~mask;
((unsigned long *)planes[1])[i] &= ~mask;
((unsigned long *)planes[2])[i] &= ~mask;
}
}
for (unsigned long i=1; i <= mod; i++) {
// Clear cyan, magenta and yellow dots if a black dot is present
bmask = planes[3][size - i];
if (bmask) {
planes[0][size - i] &= ~bmask;
planes[1][size - i] &= ~bmask;
planes[2][size - i] &= ~bmask;
}
// Set a black dot if cyan, magenta and yellow dots are present and
// clear them
bmask = planes[0][size - i];
bmask &= planes[1][size - i];
bmask &= planes[2][size - i];
if (bmask) {
planes[3][size - i] |= bmask;
planes[0][size - i] &= ~bmask;
planes[1][size - i] &= ~bmask;
planes[2][size - i] &= ~bmask;
}
}
}
#endif /* DISABLE_BLACKOPTIM */
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