1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// Copyright 2007 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); You may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
// applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
// OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.
package com.google.scrollview.ui;
import org.piccolo2d.nodes.PImage;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.xml.bind.DatatypeConverter;
/**
* The ScrollViewImageHandler is a helper class which takes care of image
* processing. It is used to construct an Image from the message-stream and
* basically consists of a number of utility functions to process the input
* stream.
*
* @author wanke@google.com
*/
public class SVImageHandler {
/* All methods are static, so we forbid to construct SVImageHandler objects. */
private SVImageHandler() {
}
/**
* Reads size bytes from the stream in and interprets it as an image file,
* encoded as png, and then text-encoded as base 64, returning the decoded
* bitmap.
*
* @param size The size of the image file.
* @param in The input stream from which to read the bytes.
*/
public static PImage readImage(int size, BufferedReader in) {
char[] charbuffer = new char[size];
int numRead = 0;
while (numRead < size) {
int newRead = -1;
try {
newRead = in.read(charbuffer, numRead, size - numRead);
} catch (IOException e) {
System.out.println("Failed to read image data from socket:" + e.getMessage());
return null;
}
if (newRead < 0) {
return null;
}
numRead += newRead;
}
if (numRead != size) {
System.out.println("Failed to read image data from socket");
return null;
}
// Convert the character data to binary.
byte[] binarydata = DatatypeConverter.parseBase64Binary(new String(charbuffer));
// Convert the binary data to a byte stream and parse to image.
ByteArrayInputStream byteStream = new ByteArrayInputStream(binarydata);
try {
PImage img = new PImage(ImageIO.read(byteStream));
return img;
} catch (IOException e) {
System.out.println("Failed to decode image data from socket" + e.getMessage());
}
return null;
}
}
|
