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annotate dwt/internal/image/PngChunkReader.d @ 7:e831403a80a9

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Add 'cast' to casts
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:30:35 +0200
parents 1a8b3cb347e0
children 5123b17c98ef
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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 *******************************************************************************/
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11 module dwt.internal.image;
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13
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14 import dwt.DWT;
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15
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16 public class PngChunkReader {
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17 LEDataInputStream inputStream;
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18 PngFileReadState readState;
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19 PngIhdrChunk headerChunk;
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20 PngPlteChunk paletteChunk;
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21
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1a8b3cb347e0 Fix Ctors to 'this'
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22 this(LEDataInputStream inputStream) {
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23 this.inputStream = inputStream;
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24 readState = new PngFileReadState();
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25 headerChunk = null;
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26 }
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28 PngIhdrChunk getIhdrChunk() {
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29 if (headerChunk is null) {
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30 try {
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31 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
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32 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
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33 headerChunk = cast(PngIhdrChunk) chunk;
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34 headerChunk.validate(readState, null);
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35 } catch (ClassCastException e) {
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36 DWT.error(DWT.ERROR_INVALID_IMAGE);
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37 }
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38 }
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39 return headerChunk;
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40 }
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41
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42 PngChunk readNextChunk() {
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43 if (headerChunk is null) return getIhdrChunk();
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44
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45 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
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46 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
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47 switch (chunk.getChunkType()) {
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48 case PngChunk.CHUNK_tRNS:
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49 (cast(PngTrnsChunk) chunk).validate(readState, headerChunk, paletteChunk);
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50 break;
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51 case PngChunk.CHUNK_PLTE:
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52 chunk.validate(readState, headerChunk);
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53 paletteChunk = cast(PngPlteChunk) chunk;
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54 break;
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55 default:
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56 chunk.validate(readState, headerChunk);
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57 }
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58 if (readState.readIDAT && !(chunk.getChunkType() is PngChunk.CHUNK_IDAT)) {
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59 readState.readPixelData = true;
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60 }
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61 return chunk;
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62 }
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64 bool readPixelData() {
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65 return readState.readPixelData;
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66 }
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67
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68 bool hasMoreChunks() {
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69 return !readState.readIEND;
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70 }
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72 }