1 /**************************************************************************
3 * Copyright 2011 Jose Fonseca
4 * Copyright 2008-2010 VMware, Inc.
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 **************************************************************************/
37 * http://en.wikipedia.org/wiki/Netpbm_format
38 * http://netpbm.sourceforge.net/doc/ppm.html
41 Image::writePNM(std::ostream &os, const char *comment) const {
42 assert(channels == 1 || channels >= 3);
44 os << (channels == 1 ? "P5" : "P6") << "\n";
46 os << "#" << comment << "\n";
48 os << width << " " << height << "\n";
51 const unsigned char *row;
53 if (channels == 1 || channels == 3) {
54 for (row = start(); row != end(); row += stride()) {
55 os.write((const char *)row, width*channels);
58 unsigned char pixel[3] = {0, 0, 0};
59 for (row = start(); row != end(); row += stride()) {
60 for (unsigned x = 0; x < width; ++x) {
61 for (unsigned channel = 0; channel < channels; ++channel) {
62 pixel[channel] = row[x*channels + channel];
64 os.write((const char *)pixel, sizeof pixel);
71 } /* namespace Image */