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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* Copyright 2008-2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include <assert.h>
#include <stdint.h>
#include "image.hpp"
namespace Image {
/**
* http://en.wikipedia.org/wiki/Netpbm_format
*/
void
Image::writePNM(std::ostream &os) const {
assert(channels == 1 || channels >= 3);
os << (channels == 1 ? "P5" : "P6") << "\n";
os << width << " " << height << "\n";
os << "255" << "\n";
const unsigned char *row;
if (channels == 1 || channels == 3) {
for (row = start(); row != end(); row += stride()) {
os.write((const char *)row, width*channels);
}
} else {
unsigned char pixel[3] = {0, 0, 0};
for (row = start(); row != end(); row += stride()) {
for (unsigned x = 0; x < width; ++x) {
for (unsigned channel = 0; channel < channels; ++channel) {
pixel[channel] = row[x*channels + channel];
}
os.write((const char *)pixel, sizeof pixel);
}
}
}
}
} /* namespace Image */
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