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/Users/lyon/j4p/src/ip/ppm/PpmEncoder.java
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1 /*
2 * @author Douglas A. Lyon
3 * @version Oct 12, 2002.11:01:21 AM
4 */
5 package ip.ppm;
6
7
8 // PpmEncoder - write out an image as a PPM
9 //
10 // Copyright (C)1996,1998 by Jef Poskanzer <jef@acme.com>. All rights reserved.
11 //
12 // Redistribution and use in source and binary forms, with or without
13 // modification, are permitted provided that the following conditions
14 // are met:
15 // 1. Redistributions of source code must retain the above copyright
16 // notice, this list of conditions and the following disclaimer.
17 // 2. Redistributions in binary form must reproduce the above copyright
18 // notice, this list of conditions and the following disclaimer in the
19 // documentation and/or other materials provided with the distribution.
20 //
21 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 // ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 // SUCH DAMAGE.
32 //
33 // Visit the ACME Labs Java page for up-to-date versions of this and other
34 // fine Java utilities: http://www.acme.com/java/
35
36
37 import java.awt.*;
38 import java.awt.image.ImageProducer;
39 import java.io.IOException;
40 import java.io.OutputStream;
41
42 /// Write out an image as a PPM.
43 // <P>
44 // Writes an image onto a specified OutputStream in the PPM file format.
45 // <P>
46 // <A HREF="/resources/classes/Acme/JPM/Encoders/PpmEncoder.java">Fetch the software.</A><BR>
47 // <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
48 // <P>
49 // @see ToPpm
50
51 public class PpmEncoder extends ImageEncoder {
52
53 /// Constructor.
54 // @param img The image to encode.
55 // @param out The stream to write the PPM to.
56 public PpmEncoder(Image img, OutputStream out) throws IOException {
57 super(img, out);
58 }
59
60 /// Constructor.
61 // @param prod The ImageProducer to encode.
62 // @param out The stream to write the PPM to.
63 public PpmEncoder(ImageProducer prod, OutputStream out) throws IOException {
64 super(prod, out);
65 }
66
67
68 void encodeStart(int width, int height) throws IOException {
69 writeString(out, "P6\n");
70 writeString(out, width + " " + height + "\n");
71 writeString(out, "255\n");
72 }
73
74 static void writeString(OutputStream out, String str) throws IOException {
75 byte[] buf = str.getBytes();
76 out.write(buf);
77 }
78
79 void encodePixels(
80 int x, int y, int w, int h, int[] rgbPixels, int off, int scansize)
81 throws IOException {
82 byte[] ppmPixels = new byte[w * 3];
83 for (int row = 0; row < h; ++row) {
84 int rowOff = off + row * scansize;
85 for (int col = 0; col < w; ++col) {
86 int i = rowOff + col;
87 int j = col * 3;
88 ppmPixels[j] = (byte) ((rgbPixels[i] & 0xff0000) >> 16);
89 ppmPixels[j + 1] = (byte) ((rgbPixels[i] & 0x00ff00) >> 8);
90 ppmPixels[j + 2] = (byte) (rgbPixels[i] & 0x0000ff);
91 }
92 out.write(ppmPixels);
93 }
94 }
95
96 void encodeDone() throws IOException {
97 // Nothing.
98 }
99
100 }
101
102