Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/java/com/google/scrollview/ui/SVImageHandler.java @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2007 Google Inc. All Rights Reserved.
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2 //
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3 // Licensed under the Apache License, Version 2.0 (the "License"); You may not
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4 // use this file except in compliance with the License. You may obtain a copy of
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5 // the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
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6 // applicable law or agreed to in writing, software distributed under the
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7 // License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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8 // OF ANY KIND, either express or implied. See the License for the specific
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9 // language governing permissions and limitations under the License.
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10
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11 package com.google.scrollview.ui;
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12
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13 import org.piccolo2d.nodes.PImage;
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14
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15 import java.io.BufferedReader;
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16 import java.io.ByteArrayInputStream;
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17 import java.io.IOException;
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18 import javax.imageio.ImageIO;
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19 import javax.xml.bind.DatatypeConverter;
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20
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21 /**
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22 * The ScrollViewImageHandler is a helper class which takes care of image
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23 * processing. It is used to construct an Image from the message-stream and
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24 * basically consists of a number of utility functions to process the input
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25 * stream.
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26 *
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27 * @author wanke@google.com
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28 */
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29 public class SVImageHandler {
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30 /* All methods are static, so we forbid to construct SVImageHandler objects. */
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31 private SVImageHandler() {
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32 }
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33
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34 /**
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35 * Reads size bytes from the stream in and interprets it as an image file,
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36 * encoded as png, and then text-encoded as base 64, returning the decoded
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37 * bitmap.
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38 *
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39 * @param size The size of the image file.
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40 * @param in The input stream from which to read the bytes.
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41 */
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42 public static PImage readImage(int size, BufferedReader in) {
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43 char[] charbuffer = new char[size];
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44 int numRead = 0;
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45 while (numRead < size) {
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46 int newRead = -1;
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47 try {
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48 newRead = in.read(charbuffer, numRead, size - numRead);
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49 } catch (IOException e) {
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50 System.out.println("Failed to read image data from socket:" + e.getMessage());
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51 return null;
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52 }
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53 if (newRead < 0) {
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54 return null;
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55 }
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56 numRead += newRead;
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57 }
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58 if (numRead != size) {
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59 System.out.println("Failed to read image data from socket");
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60 return null;
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61 }
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62 // Convert the character data to binary.
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63 byte[] binarydata = DatatypeConverter.parseBase64Binary(new String(charbuffer));
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64 // Convert the binary data to a byte stream and parse to image.
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65 ByteArrayInputStream byteStream = new ByteArrayInputStream(binarydata);
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66 try {
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67 PImage img = new PImage(ImageIO.read(byteStream));
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68 return img;
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69 } catch (IOException e) {
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70 System.out.println("Failed to decode image data from socket" + e.getMessage());
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71 }
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72 return null;
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73 }
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74 }