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/Users/lyon/j4p/src/ip/JPM/Encoders/PpmEncoder.java
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1 // PpmEncoder - write out an image as a PPM
2 //
3 // Copyright (C)1996,1998 by Jef Poskanzer <jef@acme.com>. All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions
7 // are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 //
14 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 // ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 // SUCH DAMAGE.
25 //
26 // Visit the ACME Labs Java page for up-to-date versions of this and other
27 // fine Java utilities: http://www.acme.com/java/
28
29 package ip.JPM.Encoders;
30
31 import java.awt.Image;
32 import java.awt.image.ImageProducer;
33 import java.io.IOException;
34 import java.io.OutputStream;
35
36 /// Write out an image as a PPM.
37 // <P>
38 // Writes an image onto a specified OutputStream in the PPM file format.
39 // <P>
40 // <A HREF="/resources/classes/Acme/JPM/Encoders/PpmEncoder.java">Fetch the software.</A><BR>
41 // <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
42 // <P>
43 // @see ToPpm
44
45 public class PpmEncoder extends ImageEncoder {
46
47 /// Constructor.
48 // @param img The image to encode.
49 // @param out The stream to write the PPM to.
50 public PpmEncoder(Image img,
51 OutputStream out)
52 throws IOException {
53 super(img, out);
54 }
55
56 /// Constructor.
57 // @param prod The ImageProducer to encode.
58 // @param out The stream to write the PPM to.
59 public PpmEncoder(ImageProducer prod,
60 OutputStream out)
61 throws IOException {
62 super(prod, out);
63 }
64
65
66 public void encodeStart(int width,
67 int height)
68 throws IOException {
69 writeString(out, "P6\n");
70 writeString(out,
71 width + " " + height + "\n");
72 writeString(out, "255\n");
73 }
74
75 static void writeString(OutputStream out,
76 String str)
77 throws IOException {
78 byte[] buf = str.getBytes();
79 out.write(buf);
80 }
81
82 public void encodePixels(int x,
83 int y,
84 int w,
85 int h,
86 int[] rgbPixels,
87 int off,
88 int scansize)
89 throws IOException {
90 byte[] ppmPixels = new byte[w * 3];
91 for (int row = 0; row < h; ++row) {
92 int rowOff = off + row * scansize;
93 for (int col = 0; col < w; ++col) {
94 int i = rowOff + col;
95 int j = col * 3;
96 ppmPixels[j] =
97 (byte) ((rgbPixels[i] & 0xff0000) >>
98 16);
99 ppmPixels[j + 1] =
100 (byte) ((rgbPixels[i] & 0x00ff00) >>
101 8);
102 ppmPixels[j + 2] =
103 (byte) (rgbPixels[i] & 0x0000ff);
104 }
105 out.write(ppmPixels);
106 }
107 }
108
109 public void encodeDone() throws IOException {
110 // Nothing.
111 }
112
113 }
114