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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-21-11
* Description : A 16 bits/color/pixel PPM IO file for
* DImg framework
*
* Copyright (C) 2005 by Renchi Raju <renchi@pooh.tam.uiuc.edu>
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* 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, 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.
*
* ============================================================ */
// This line must be commented to prevent any latency time
// when we use threaded image loader interface for each image
// files io. Uncomment this line only for debugging.
//#define ENABLE_DEBUG_MESSAGES
// C ansi includes.
extern "C"
{
#include <unistd.h>
}
// C++ includes.
#include <cstdio>
#include <cmath>
// TQt includes.
#include <tqfile.h>
#include <tqimage.h>
// Local includes.
#include "ddebug.h"
#include "dimg.h"
#include "dimgloaderobserver.h"
#include "ppmloader.h"
namespace Digikam
{
PPMLoader::PPMLoader(DImg* image)
: DImgLoader(image)
{
}
bool PPMLoader::load(const TQString& filePath, DImgLoaderObserver *observer)
{
//TODO: progress information
int width, height, rgbmax;
char nl;
FILE *file = fopen(TQFile::encodeName(filePath), "rb");
if (!file)
{
DDebug() << k_funcinfo << "Cannot open image file." << endl;
return false;
}
ushort header;
if (fread(&header, 2, 1, file) != 1)
{
DDebug() << k_funcinfo << "Cannot read header of file." << endl;
fclose(file);
return false;
}
uchar* c = (uchar*) &header;
if (*c != 'P')
{
DDebug() << k_funcinfo << "Not a PPM file." << endl;
fclose(file);
return false;
}
c++;
if (*c != '6')
{
DDebug() << k_funcinfo << "Not a PPM file." << endl;
fclose(file);
return false;
}
rewind(file);
if (fscanf (file, "P6 %d %d %d%c", &width, &height, &rgbmax, &nl) != 4)
{
DDebug() << "Corrupted PPM file." << endl;
pclose (file);
return false;
}
if (rgbmax <= 255)
{
DDebug() << k_funcinfo << "Not a 16 bits per color per pixel PPM file." << endl;
pclose (file);
return false;
}
if (observer)
observer->progressInfo(m_image, 0.1);
unsigned short *data;
data = new unsigned short[width*height*4];
unsigned short *dst = data;
uchar src[6];
float fac = 65535.0 / rgbmax;
int checkpoint = 0;
#ifdef ENABLE_DEBUG_MESSAGES
DDebug() << "rgbmax=" << rgbmax << " fac=" << fac << endl;
#endif
for (int h = 0; h < height; h++)
{
if (observer && h == checkpoint)
{
checkpoint += granularity(observer, height, 0.9);
if (!observer->continueQuery(m_image))
{
delete [] data;
pclose( file );
return false;
}
observer->progressInfo(m_image, 0.1 + (0.9 * ( ((float)h)/((float)height) )));
}
for (int w = 0; w < width; w++)
{
fread (src, 6 *sizeof(unsigned char), 1, file);
dst[0] = (unsigned short)((src[4]*256 + src[5]) * fac); // Blue
dst[1] = (unsigned short)((src[2]*256 + src[3]) * fac); // Green
dst[2] = (unsigned short)((src[0]*256 + src[1]) * fac); // Red
dst[3] = 0xFFFF;
dst += 4;
}
}
fclose( file );
//----------------------------------------------------------
imageWidth() = width;
imageHeight() = height;
imageData() = (uchar*)data;
imageSetAttribute("format", "PPM");
return true;
}
bool PPMLoader::save(const TQString& /*filePath*/, DImgLoaderObserver */*observer*/)
{
return false;
}
} // NameSpace Digikam
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