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imageResize.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file imageResize.cxx
10 * @author drose
11 * @date 2003-03-13
12 */
13
14#include "imageResize.h"
15#include "string_utils.h"
16
17/**
18 *
19 */
20ImageResize::
21ImageResize() : ImageFilter(true) {
22 set_program_brief("resize an image file");
23 set_program_description
24 ("This program reads an image file and resizes it to a larger or smaller "
25 "image file.");
26
27 add_option
28 ("x", "xsize", 0,
29 "Specify the width of the output image in pixels, or as a percentage "
30 "of the original width (if a trailing percent sign is included). "
31 "If this is omitted, the ratio is taken from the ysize parameter.",
32 &ImageResize::dispatch_size_request, nullptr, &_x_size);
33
34 add_option
35 ("y", "ysize", 0,
36 "Specify the height of the output image in pixels, or as a percentage "
37 "of the original height (if a trailing percent sign is included). "
38 "If this is omitted, the ratio is taken from the xsize parameter.",
39 &ImageResize::dispatch_size_request, nullptr, &_y_size);
40
41 add_option
42 ("g", "radius", 0,
43 "Use Gaussian filtering to resize the image, with the indicated radius.",
44 &ImageResize::dispatch_double, &_use_gaussian_filter, &_filter_radius);
45
46 add_option
47 ("1", "", 0,
48 "This option is ignored. It is provided only for backward compatibility "
49 "with a previous version of image-resize.",
50 &ImageResize::dispatch_none, nullptr, nullptr);
51
52 _filter_radius = 1.0;
53}
54
55/**
56 *
57 */
58void ImageResize::
59run() {
60 if (_x_size.get_type() == RT_none && _y_size.get_type() == RT_none) {
61 _x_size.set_ratio(1.0);
62 _y_size.set_ratio(1.0);
63 } else if (_x_size.get_type() == RT_none) {
64 _x_size.set_ratio(_y_size.get_ratio(_image.get_y_size()));
65 } else if (_y_size.get_type() == RT_none) {
66 _y_size.set_ratio(_x_size.get_ratio(_image.get_x_size()));
67 }
68
69 int x_size = _x_size.get_pixel_size(_image.get_x_size());
70 int y_size = _y_size.get_pixel_size(_image.get_y_size());
71
72 nout << "Resizing to " << x_size << " x " << y_size << "\n";
73 PNMImage new_image(x_size, y_size,
74 _image.get_num_channels(),
75 _image.get_maxval(), _image.get_type());
76
77 if (_use_gaussian_filter) {
78 new_image.gaussian_filter_from(_filter_radius, _image);
79 } else {
80 new_image.quick_filter_from(_image);
81 }
82
83 write_image(new_image);
84}
85
86/**
87 * Interprets the -x or -y parameters.
88 */
89bool ImageResize::
90dispatch_size_request(const std::string &opt, const std::string &arg, void *var) {
91 SizeRequest *ip = (SizeRequest *)var;
92 if (!arg.empty() && arg[arg.length() - 1] == '%') {
93 // A ratio.
94 std::string str = arg.substr(0, arg.length() - 1);
95 double ratio;
96 if (!string_to_double(str, ratio)) {
97 nout << "Invalid ratio for -" << opt << ": "
98 << str << "\n";
99 return false;
100 }
101 ip->set_ratio(ratio / 100.0);
102
103 } else {
104 // A pixel size.
105 int pixel_size;
106 if (!string_to_int(arg, pixel_size)) {
107 nout << "Invalid pixel size for -" << opt << ": "
108 << arg << "\n";
109 return false;
110 }
111 ip->set_pixel_size(pixel_size);
112 }
113
114 return true;
115}
116
117
118int main(int argc, char *argv[]) {
119 ImageResize prog;
120 prog.parse_command_line(argc, argv);
121 prog.run();
122 return 0;
123}
This is the base class for a program that reads an image file, operates on it, and writes another ima...
Definition imageFilter.h:26
A program to read an image file and resize it to a larger or smaller image file.
Definition imageResize.h:25
void write_image()
Writes the generated to the user's specified output filename.
Definition imageWriter.I:18
The name of this class derives from the fact that we originally implemented it as a layer on top of t...
Definition pnmImage.h:58
virtual void parse_command_line(int argc, char **argv)
Dispatches on each of the options on the command line, and passes the remaining parameters to handle_...
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
double string_to_double(const string &str, string &tail)
A string-interface wrapper around the C library strtol().
int string_to_int(const string &str, string &tail)
A string-interface wrapper around the C library strtol().
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.