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annotate dwt/internal/image/PngIdatChunk.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
parents 9a64a7781bab
children
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92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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1 /*******************************************************************************
2
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.internal.image.PngIdatChunk;
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15
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16 import dwt.DWT;
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17 import dwt.internal.image.PngFileReadState;
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18 import dwt.internal.image.PngIhdrChunk;
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19 import dwt.internal.image.PngChunk;
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20 import dwt.dwthelper.utils;
2
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21
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22 class PngIdatChunk : PngChunk {
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23
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24 static const int HEADER_BYTES_LENGTH = 2;
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25 static const int ADLER_FIELD_LENGTH = 4;
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26 static const int HEADER_BYTE1_DATA_OFFSET = DATA_OFFSET + 0;
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27 static const int HEADER_BYTE2_DATA_OFFSET = DATA_OFFSET + 1;
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28 static const int ADLER_DATA_OFFSET = DATA_OFFSET + 2; // plus variable compressed data length
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29
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30 this(byte headerByte1, byte headerByte2, byte[] data, int adler) {
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31 super(data.length + HEADER_BYTES_LENGTH + ADLER_FIELD_LENGTH);
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32 setType(TYPE_IDAT);
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33 reference[HEADER_BYTE1_DATA_OFFSET] = headerByte1;
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34 reference[HEADER_BYTE2_DATA_OFFSET] = headerByte2;
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35 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length);
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36 setInt32(ADLER_DATA_OFFSET, adler);
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37 setCRC(computeCRC());
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38 }
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39
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40 this(byte[] reference) {
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41 super(reference);
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42 }
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44 override int getChunkType() {
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45 return CHUNK_IDAT;
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46 }
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47
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48 /**
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49 * Answer whether the chunk is a valid IDAT chunk.
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50 */
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51 override void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
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52 if (!readState.readIHDR
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53 || (headerChunk.getMustHavePalette() && !readState.readPLTE)
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54 || readState.readIEND)
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55 {
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56 DWT.error(DWT.ERROR_INVALID_IMAGE);
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57 } else {
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58 readState.readIDAT = true;
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59 }
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61 super.validate(readState, headerChunk);
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62 }
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63
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64 byte getDataByteAtOffset(int offset) {
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65 return reference[DATA_OFFSET + offset];
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66 }
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67
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68 }