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/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#include "imageIO.pfm.h"
#include "errorMessage.h"
#include <memory>
#include <cassert>
#include <fstream>
//////////////////////
// Helper functions //
//////////////////////
static void skipToNewline(std::ifstream& ifs)
{
while(ifs.get() != '\n' && ifs.good());
}
static void skipComments(std::ifstream& ifs)
{
while(!ifs.eof() && ifs.peek() == '#') skipToNewline(ifs);
}
////////////////
// Import PFM //
////////////////
void importPFM(const std::string& name, image& img)
{
// open file
std::ifstream ifs(name.c_str(), std::ifstream::binary);
if(!ifs.is_open()) errorMessage("Unable to open file: '%s'.", name.c_str());
// read header
std::string magicMark;
ifs >> magicMark;
skipToNewline(ifs);
if(magicMark != "PF") errorMessage("Unsupported PFM format (%s).", magicMark.c_str());
// read width and height
image::size_type width, height;
skipComments(ifs);
ifs >> width >> height;
skipToNewline(ifs);
// allocate
img = image(width, height);
// check magic number (again)
skipComments(ifs);
ifs >> magicMark;
skipToNewline(ifs);
if(magicMark != "-1.000000") errorMessage("Unsupported byte-order in PFM.");
// read directly in float image
ifs.read((char *)(img.begin()), img.size() * sizeof(color));
// Done.
}
////////////////
// Export PFM //
////////////////
void exportPFM(const std::string& name, const image& img)
{
// sanity check
assert(img.width() != 0 && img.height() != 0);
// open file
std::ofstream ofs(name.c_str(), std::ofstream::binary);
if(!ofs.is_open()) errorMessage("Unable to open file: '%s'.", name.c_str());
// write header
ofs << "PF\n" << img.width() << " " << img.height() << "\n-1.000000\n";
// write float buffer
ofs.write((const char*)(img.begin()), img.size() * sizeof(color));
// Done.
}
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