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annotate dwt/internal/image/PngChunkReader.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents e831403a80a9
children
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1 /*******************************************************************************
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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.PngChunkReader;
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16 import dwt.DWT;
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17 import dwt.internal.image.LEDataInputStream;
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18 import dwt.internal.image.PngFileReadState;
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19 import dwt.internal.image.PngIhdrChunk;
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20 import dwt.internal.image.PngPlteChunk;
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21 import dwt.internal.image.PngTrnsChunk;
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22 import dwt.internal.image.PngChunk;
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24 public class PngChunkReader {
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25 LEDataInputStream inputStream;
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26 PngFileReadState readState;
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27 PngIhdrChunk headerChunk;
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28 PngPlteChunk paletteChunk;
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30 this(LEDataInputStream inputStream) {
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31 this.inputStream = inputStream;
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32 readState = new PngFileReadState();
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33 headerChunk = null;
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34 }
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36 PngIhdrChunk getIhdrChunk() {
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37 if (headerChunk is null) {
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38 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
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39 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
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40 if(( headerChunk = cast(PngIhdrChunk) chunk ) !is null ){
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41 headerChunk.validate(readState, null);
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42 }
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43 else{
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44 DWT.error(DWT.ERROR_INVALID_IMAGE);
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45 }
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46 }
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47 return headerChunk;
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48 }
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49
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50 PngChunk readNextChunk() {
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51 if (headerChunk is null) return getIhdrChunk();
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52
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53 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
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54 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
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55 switch (chunk.getChunkType()) {
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56 case PngChunk.CHUNK_tRNS:
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57 (cast(PngTrnsChunk) chunk).validate(readState, headerChunk, paletteChunk);
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58 break;
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59 case PngChunk.CHUNK_PLTE:
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60 chunk.validate(readState, headerChunk);
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61 paletteChunk = cast(PngPlteChunk) chunk;
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62 break;
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63 default:
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64 chunk.validate(readState, headerChunk);
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65 }
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66 if (readState.readIDAT && !(chunk.getChunkType() is PngChunk.CHUNK_IDAT)) {
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67 readState.readPixelData = true;
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68 }
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69 return chunk;
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70 }
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71
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72 bool readPixelData() {
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73 return readState.readPixelData;
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74 }
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75
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76 bool hasMoreChunks() {
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77 return !readState.readIEND;
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78 }
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80 }