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 **************************************************************************/
38 * http://en.wikipedia.org/wiki/Netpbm_format
39 * http://netpbm.sourceforge.net/doc/ppm.html
42 Image::writePNM(std::ostream &os, const char *comment) const {
43 assert(channels == 1 || channels >= 3);
45 os << (channels == 1 ? "P5" : "P6") << "\n";
47 os << "#" << comment << "\n";
49 os << width << " " << height << "\n";
52 const unsigned char *row;
54 if (channels == 1 || channels == 3) {
55 for (row = start(); row != end(); row += stride()) {
56 os.write((const char *)row, width*channels);
59 unsigned char *tmp = new unsigned char[width*3];
61 for (row = start(); row != end(); row += stride()) {
62 const uint32_t *src = (const uint32_t *)row;
63 uint32_t *dst = (uint32_t *)tmp;
65 for (x = 0; x + 4 <= width; x += 4) {
67 * It's much faster to access dwords than bytes.
69 * FIXME: Big-endian version.
72 uint32_t rgba0 = *src++ & 0xffffff;
73 uint32_t rgba1 = *src++ & 0xffffff;
74 uint32_t rgba2 = *src++ & 0xffffff;
75 uint32_t rgba3 = *src++ & 0xffffff;
78 uint32_t rgb1 = (rgba1 >> 8)
80 uint32_t rgb2 = (rgba2 >> 16)
86 for (; x < width; ++x) {
87 tmp[x*3 + 0] = row[x*4 + 0];
88 tmp[x*3 + 1] = row[x*4 + 1];
89 tmp[x*3 + 2] = row[x*4 + 2];
91 os.write((const char *)tmp, width*3);
93 } else if (channels == 2) {
94 for (row = start(); row != end(); row += stride()) {
95 const unsigned char *src = row;
96 unsigned char *dst = tmp;
97 for (unsigned x = 0; x < width; ++x) {
102 os.write((const char *)tmp, width*3);
112 } /* namespace Image */