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comparison 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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33:965ac0a77267 34:5123b17c98ef
1 /******************************************************************************* 1 /*******************************************************************************
2 * Copyright (c) 2000, 2006 IBM Corporation and others. 2 * Copyright (c) 2000, 2006 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials 3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0 4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at 5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html 6 * http://www.eclipse.org/legal/epl-v10.html
7 * 7 *
8 * Contributors: 8 * Contributors:
9 * IBM Corporation - initial API and implementation 9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
10 *******************************************************************************/ 12 *******************************************************************************/
11 module dwt.internal.image; 13 module dwt.internal.image.PngChunkReader;
12 14
13 15
14 import dwt.DWT; 16 import dwt.DWT;
17 import dwt.internal.image.LEDataInputStream;
18 import dwt.internal.image.PngFileReadState;
19 import dwt.internal.image.PngIhdrChunk;
20 import dwt.internal.image.PngPlteChunk;
21 import dwt.internal.image.PngTrnsChunk;
22 import dwt.internal.image.PngChunk;
15 23
16 public class PngChunkReader { 24 public class PngChunkReader {
17 LEDataInputStream inputStream; 25 LEDataInputStream inputStream;
18 PngFileReadState readState; 26 PngFileReadState readState;
19 PngIhdrChunk headerChunk; 27 PngIhdrChunk headerChunk;
20 PngPlteChunk paletteChunk; 28 PngPlteChunk paletteChunk;
21 29
22 this(LEDataInputStream inputStream) { 30 this(LEDataInputStream inputStream) {
23 this.inputStream = inputStream; 31 this.inputStream = inputStream;
24 readState = new PngFileReadState(); 32 readState = new PngFileReadState();
25 headerChunk = null; 33 headerChunk = null;
26 } 34 }
27 35
28 PngIhdrChunk getIhdrChunk() { 36 PngIhdrChunk getIhdrChunk() {
29 if (headerChunk is null) { 37 if (headerChunk is null) {
30 try { 38 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
31 PngChunk chunk = PngChunk.readNextFromStream(inputStream); 39 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
32 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE); 40 if(( headerChunk = cast(PngIhdrChunk) chunk ) !is null ){
33 headerChunk = cast(PngIhdrChunk) chunk;
34 headerChunk.validate(readState, null); 41 headerChunk.validate(readState, null);
35 } catch (ClassCastException e) { 42 }
43 else{
36 DWT.error(DWT.ERROR_INVALID_IMAGE); 44 DWT.error(DWT.ERROR_INVALID_IMAGE);
37 } 45 }
38 } 46 }
39 return headerChunk; 47 return headerChunk;
40 } 48 }
41 49
42 PngChunk readNextChunk() { 50 PngChunk readNextChunk() {
43 if (headerChunk is null) return getIhdrChunk(); 51 if (headerChunk is null) return getIhdrChunk();
44 52
45 PngChunk chunk = PngChunk.readNextFromStream(inputStream); 53 PngChunk chunk = PngChunk.readNextFromStream(inputStream);
46 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE); 54 if (chunk is null) DWT.error(DWT.ERROR_INVALID_IMAGE);
47 switch (chunk.getChunkType()) { 55 switch (chunk.getChunkType()) {
48 case PngChunk.CHUNK_tRNS: 56 case PngChunk.CHUNK_tRNS:
49 (cast(PngTrnsChunk) chunk).validate(readState, headerChunk, paletteChunk); 57 (cast(PngTrnsChunk) chunk).validate(readState, headerChunk, paletteChunk);