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/*
* page.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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id: page.cpp 301 2012-02-29 14:11:09Z tillkamppeter $
*
*/
#include "page.h"
#include <unistd.h>
#include <string.h>
#include "band.h"
#include "errlog.h"
/*
* This magic formula reverse the bit of a byte. ie. the bit 1 becomes the
* bit 8, the bit 2 becomes the bit 7 etc.
*/
#define REVERSE_BITS(N) ((N * 0x0202020202ULL & 0x010884422010ULL) % 1023)
/*
* Constructeur - Destructeur
* Init - Uninit
*/
Page::Page()
{
_empty = true;
_xResolution = 0;
_yResolution = 0;
_planes[0] = NULL;
_planes[1] = NULL;
_planes[2] = NULL;
_planes[3] = NULL;
_firstBand = NULL;
_lastBand = NULL;
_bandsNr = 0;
_bih = NULL;
}
Page::~Page()
{
flushPlanes();
if (_firstBand)
delete _firstBand;
if (_bih)
delete[] _bih;
}
/*
* Enregistrement d'une nouvelle bande
* Register a new band
*/
void Page::registerBand(Band *band)
{
if (_lastBand)
_lastBand->registerSibling(band);
else
_firstBand = band;
_lastBand = band;
band->registerParent(this);
_bandsNr++;
}
/*
* Rotation des couches
* Rotate bitmaps planes
*/
void Page::rotate()
{
unsigned long size, midSize;
unsigned char tmp;
size = _width * _height / 8;
midSize = size / 2;
for (unsigned int i=0; i < _colors; i++) {
for (unsigned long j=0; j < midSize; j++) {
tmp = _planes[i][j];
_planes[i][j] = REVERSE_BITS(_planes[i][size - j - 1]);
_planes[i][size - j - 1] = REVERSE_BITS(tmp);
}
}
}
/*
* Libération de la mémoire utilisée par les couches
* Flush the planes
*/
void Page::flushPlanes()
{
for (unsigned int i=0; i < 4; i++) {
if (_planes[i]) {
delete[] _planes[i];
_planes[i] = NULL;
}
}
_empty = false;
}
/*
* Mise sur disque / Rechargement
* Swapping / restoring
*/
bool Page::swapToDisk(int fd)
{
unsigned long i;
Band* band;
if (_planes[0] || _planes[1] || _planes[2] || _planes[3]) {
ERRORMSG(_("Cannot swap page instance which still contains bitmap "
"representation"));
return false;
}
write(fd, &_xResolution, sizeof(_xResolution));
write(fd, &_yResolution, sizeof(_yResolution));
write(fd, &_width, sizeof(_width));
write(fd, &_height, sizeof(_height));
write(fd, &_colors, sizeof(_colors));
write(fd, &_pageNr, sizeof(_pageNr));
write(fd, &_copiesNr, sizeof(_copiesNr));
write(fd, &_compression, sizeof(_compression));
write(fd, &_empty, sizeof(_empty));
write(fd, &_bandsNr, sizeof(_bandsNr));
/* Carefully check if there is BIH data and compression type is 0x15,
before saving BIH data to file. */
if (( 0x15 == _compression ) && ( _bandsNr > 0 ) && ( NULL != _bih ))
write(fd, _bih, 20);
for (i=0, band = _firstBand; i < _bandsNr; i++) {
if (!band->swapToDisk(fd))
return false;
band = band->sibling();
}
return true;
}
Page* Page::restoreIntoMemory(int fd)
{
unsigned long nr;
Page* page;
page = new Page();
read(fd, &page->_xResolution, sizeof(page->_xResolution));
read(fd, &page->_yResolution, sizeof(page->_yResolution));
read(fd, &page->_width, sizeof(page->_width));
read(fd, &page->_height, sizeof(page->_height));
read(fd, &page->_colors, sizeof(page->_colors));
read(fd, &page->_pageNr, sizeof(page->_pageNr));
read(fd, &page->_copiesNr, sizeof(page->_copiesNr));
read(fd, &page->_compression, sizeof(page->_compression));
read(fd, &page->_empty, sizeof(page->_empty));
read(fd, &nr, sizeof(nr));
/* Check if compression type is 0x15 and that there is at least one
image band before reading BIH data. */
if (( 0x15 == page->_compression ) && ( nr > 0 )) {
unsigned char bih[20];
read(fd, bih, 20);
page->setBIH(bih);
}
for (unsigned int i=0; i < nr; i++) {
Band *band = Band::restoreIntoMemory(fd);
if (!band) {
delete page;
return NULL;
}
page->registerBand(band);
}
return page;
}
void Page::setBIH(const unsigned char *bih_data) {
if (NULL == _bih)
_bih = new unsigned char[20];
memcpy(_bih, bih_data, 20);
}
/* vim: set expandtab tabstop=4 shiftwidth=4 smarttab tw=80 cin enc=utf8: */
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