projects/dwt-win: dwt/internal/image/PNGFileFormat.d annotate

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

Update to SWT 3.4M7

author	Frank Benoit <benoit@tionex.de>
date	Sat, 17 May 2008 17:34:28 +0200
parents	9a64a7781bab
children	fd9c62a2998e

rev	line source
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	1 /*******************************************************************************
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	2 * Copyright (c) 2000, 2006 IBM Corporation and others.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	3 * All rights reserved. This program and the accompanying materials
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	4 * are made available under the terms of the Eclipse Public License v1.0
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	5 * which accompanies this distribution, and is available at
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	6 * http://www.eclipse.org/legal/epl-v10.html
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	7 *
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	8 * Contributors:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	9 * IBM Corporation - initial API and implementation
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	10 * Port to the D programming language:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	11 * Frank Benoit <benoit@tionex.de>
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	12 *******************************************************************************/
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	13 module dwt.internal.image.PNGFileFormat;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	14
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	15
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	16 import dwt.DWT;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	17 import dwt.graphics.ImageData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	18 import dwt.graphics.ImageLoaderEvent;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	19 import dwt.graphics.ImageLoader;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	20 import dwt.graphics.PaletteData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	21 import dwt.internal.Compatibility;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	22 import dwt.internal.image.FileFormat;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	23 import dwt.internal.image.PngIhdrChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	24 import dwt.internal.image.PngPlteChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	25 import dwt.internal.image.PngChunkReader;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	26 import dwt.internal.image.PngChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	27 import dwt.internal.image.PngTrnsChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	28 import dwt.internal.image.PngIdatChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	29 import dwt.internal.image.PngEncoder;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	30 import dwt.internal.image.PngInputStream;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	31 import dwt.internal.image.PngDecodingDataStream;
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 48 diff changeset	32 import dwt.dwthelper.utils;
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	33
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	34 import dwt.dwthelper.BufferedInputStream;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	35
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	36 import tango.core.Exception;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	37
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	38 final class PNGFileFormat : FileFormat {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	39 static final int SIGNATURE_LENGTH = 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	40 static final int PRIME = 65521;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	41 PngIhdrChunk headerChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	42 PngPlteChunk paletteChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	43 ImageData imageData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	44 byte[] data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	45 byte[] alphaPalette;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	46 byte headerByte1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	47 byte headerByte2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	48 int adler;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	49
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	50 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	51 * Skip over signature data. This has already been
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	52 * verified in isFileFormat().
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	53 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	54 void readSignature() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	55 byte[] signature = new byte[SIGNATURE_LENGTH];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	56 inputStream.read(signature);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	57 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	58 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	59 * Load the PNG image from the byte stream.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	60 */
48 9a64a7781bab Added override and alias, first chunk. Thanks torhu for doing this patch. Frank Benoit <benoit@tionex.de> parents: 31 diff changeset	61 override ImageData[] loadFromByteStream() {
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	62 try {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	63 readSignature();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	64 PngChunkReader chunkReader = new PngChunkReader(inputStream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	65 headerChunk = chunkReader.getIhdrChunk();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	66 int width = headerChunk.getWidth(), height = headerChunk.getHeight();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	67 if (width <= 0 \|\| height <= 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	68 int imageSize = getAlignedBytesPerRow() * height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	69 data = new byte[imageSize];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	70 imageData = ImageData.internal_new(
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	71 width,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	72 height,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	73 headerChunk.getSwtBitsPerPixel(),
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	74 new PaletteData(0, 0, 0),
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	75 4,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	76 data,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	77 0,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	78 null,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	79 null,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	80 -1,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	81 -1,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	82 DWT.IMAGE_PNG,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	83 0,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	84 0,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	85 0,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	86 0);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	87
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	88 if (headerChunk.usesDirectColor()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	89 imageData.palette = headerChunk.getPaletteData();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	90 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	91
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	92 // Read and process chunks until the IEND chunk is encountered.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	93 while (chunkReader.hasMoreChunks()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	94 readNextChunk(chunkReader);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	95 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	96
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	97 return [imageData];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	98 } catch (IOException e) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	99 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	100 return null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	101 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	102 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	103 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	104 * Read and handle the next chunk of data from the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	105 * PNG file.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	106 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	107 void readNextChunk(PngChunkReader chunkReader) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	108 PngChunk chunk = chunkReader.readNextChunk();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	109 switch (chunk.getChunkType()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	110 case PngChunk.CHUNK_IEND:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	111 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	112 case PngChunk.CHUNK_PLTE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	113 if (!headerChunk.usesDirectColor()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	114 paletteChunk = cast(PngPlteChunk) chunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	115 imageData.palette = paletteChunk.getPaletteData();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	116 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	117 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	118 case PngChunk.CHUNK_tRNS:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	119 PngTrnsChunk trnsChunk = cast(PngTrnsChunk) chunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	120 if (trnsChunk.getTransparencyType(headerChunk) is
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	121 PngTrnsChunk.TRANSPARENCY_TYPE_PIXEL)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	122 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	123 imageData.transparentPixel =
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	124 trnsChunk.getSwtTransparentPixel(headerChunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	125 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	126 alphaPalette = trnsChunk.getAlphaValues(headerChunk, paletteChunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	127 int transparentCount = 0, transparentPixel = -1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	128 for (int i = 0; i < alphaPalette.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	129 if ((alphaPalette[i] & 0xFF) !is 255) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	130 transparentCount++;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	131 transparentPixel = i;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	132 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	133 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	134 if (transparentCount is 0) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	135 alphaPalette = null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	136 } else if (transparentCount is 1 && alphaPalette[transparentPixel] is 0) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	137 alphaPalette = null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	138 imageData.transparentPixel = transparentPixel;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	139 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	140 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	141 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	142 case PngChunk.CHUNK_IDAT:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	143 if (chunkReader.readPixelData()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	144 // All IDAT chunks in an image file must be
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	145 // sequential. If the pixel data has already
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	146 // been read and another IDAT block is encountered,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	147 // then this is an invalid image.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	148 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	149 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	150 // Read in the pixel data for the image. This should
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	151 // go through all the image's IDAT chunks.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	152 PngIdatChunk dataChunk = cast(PngIdatChunk) chunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	153 readPixelData(dataChunk, chunkReader);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	154 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	155 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	156 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	157 if (chunk.isCritical()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	158 // All critical chunks must be supported.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	159 DWT.error(DWT.ERROR_NOT_IMPLEMENTED);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	160 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	161 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	162 }
48 9a64a7781bab Added override and alias, first chunk. Thanks torhu for doing this patch. Frank Benoit <benoit@tionex.de> parents: 31 diff changeset	163 override void unloadIntoByteStream(ImageLoader loader) {
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	164 PngEncoder encoder = new PngEncoder(loader);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	165 encoder.encode(outputStream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	166 }
48 9a64a7781bab Added override and alias, first chunk. Thanks torhu for doing this patch. Frank Benoit <benoit@tionex.de> parents: 31 diff changeset	167 override bool isFileFormat(LEDataInputStream stream) {
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	168 try {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	169 byte[] signature = new byte[SIGNATURE_LENGTH];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	170 stream.read(signature);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	171 stream.unread(signature);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	172 if ((signature[0] & 0xFF) !is 137) return false; //137
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	173 if ((signature[1] & 0xFF) !is 80) return false; //P
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	174 if ((signature[2] & 0xFF) !is 78) return false; //N
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	175 if ((signature[3] & 0xFF) !is 71) return false; //G
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	176 if ((signature[4] & 0xFF) !is 13) return false; //<RETURN>
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	177 if ((signature[5] & 0xFF) !is 10) return false; //<LINEFEED>
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	178 if ((signature[6] & 0xFF) !is 26) return false; //<CTRL/Z>
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 48 diff changeset	179 if ((signature[7] & 0xFF) !is 10) return false; //<LINEFEED>
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	180 return true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	181 } catch (Exception e) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	182 return false;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	183 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	184 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	185 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	186 * DWT does not support 16-bit depths. If this image uses
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	187 * 16-bit depths, convert the data to an 8-bit depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	188 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	189 byte[] validateBitDepth(byte[] data) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	190 if (headerChunk.getBitDepth() > 8) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	191 byte[] result = new byte[data.length / 2];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	192 compress16BitDepthTo8BitDepth(data, 0, result, 0, result.length);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	193 return result;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	194 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	195 return data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	196 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	197 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	198 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	199 * DWT does not support greyscale as a color type. For
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	200 * plain grayscale, we create a palette. For Grayscale
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	201 * with Alpha, however, we need to convert the pixels
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	202 * to use RGB values.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	203 * Note: This method assumes that the bit depth of the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	204 * data has already been restricted to 8 or less.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	205 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	206 void setPixelData(byte[] data, ImageData imageData) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	207 switch (headerChunk.getColorType()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	208 case PngIhdrChunk.COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	209 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	210 int width = imageData.width;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	211 int height = imageData.height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	212 int destBytesPerLine = imageData.bytesPerLine;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	213 /*
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	214 * If the image uses 16-bit depth, it is converted
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	215 * to an 8-bit depth image.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	216 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	217 int srcBytesPerLine = getAlignedBytesPerRow();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	218 if (headerChunk.getBitDepth() > 8) srcBytesPerLine /= 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	219
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	220 byte[] rgbData = new byte[destBytesPerLine * height];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	221 byte[] alphaData = new byte[width * height];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	222 for (int y = 0; y < height; y++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	223 int srcIndex = srcBytesPerLine * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	224 int destIndex = destBytesPerLine * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	225 int destAlphaIndex = width * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	226 for (int x = 0; x < width; x++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	227 byte grey = data[srcIndex];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	228 byte alpha = data[srcIndex + 1];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	229 rgbData[destIndex + 0] = grey;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	230 rgbData[destIndex + 1] = grey;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	231 rgbData[destIndex + 2] = grey;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	232 alphaData[destAlphaIndex] = alpha;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	233 srcIndex += 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	234 destIndex += 3;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	235 destAlphaIndex++;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	236 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	237 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	238 imageData.data = rgbData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	239 imageData.alphaData = alphaData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	240 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	241 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	242 case PngIhdrChunk.COLOR_TYPE_RGB_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	243 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	244 int width = imageData.width;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	245 int height = imageData.height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	246 int destBytesPerLine = imageData.bytesPerLine;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	247 int srcBytesPerLine = getAlignedBytesPerRow();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	248 /*
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	249 * If the image uses 16-bit depth, it is converted
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	250 * to an 8-bit depth image.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	251 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	252 if (headerChunk.getBitDepth() > 8) srcBytesPerLine /= 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	253
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	254 byte[] rgbData = new byte[destBytesPerLine * height];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	255 byte[] alphaData = new byte[width * height];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	256 for (int y = 0; y < height; y++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	257 int srcIndex = srcBytesPerLine * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	258 int destIndex = destBytesPerLine * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	259 int destAlphaIndex = width * y;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	260 for (int x = 0; x < width; x++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	261 rgbData[destIndex + 0] = data[srcIndex + 0];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	262 rgbData[destIndex + 1] = data[srcIndex + 1];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	263 rgbData[destIndex + 2] = data[srcIndex + 2];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	264 alphaData[destAlphaIndex] = data[srcIndex + 3];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	265 srcIndex += 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	266 destIndex += 3;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	267 destAlphaIndex++;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	268 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	269 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	270 imageData.data = rgbData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	271 imageData.alphaData = alphaData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	272 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	273 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	274 case PngIhdrChunk.COLOR_TYPE_RGB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	275 imageData.data = data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	276 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	277 case PngIhdrChunk.COLOR_TYPE_PALETTE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	278 imageData.data = data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	279 if (alphaPalette !is null) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	280 int size = imageData.width * imageData.height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	281 byte[] alphaData = new byte[size];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	282 byte[] pixelData = new byte[size];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	283 imageData.getPixels(0, 0, size, pixelData, 0);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	284 for (int i = 0; i < pixelData.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	285 alphaData[i] = alphaPalette[pixelData[i] & 0xFF];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	286 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	287 imageData.alphaData = alphaData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	288 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	289 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	290 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	291 imageData.data = data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	292 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	293 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	294 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	295 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	296 * PNG supports some color types and bit depths that are
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	297 * unsupported by DWT. If the image uses an unsupported
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	298 * color type (either of the gray scale types) or bit
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	299 * depth (16), convert the data to an DWT-supported
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	300 * format. Then assign the data into the ImageData given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	301 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	302 void setImageDataValues(byte[] data, ImageData imageData) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	303 byte[] result = validateBitDepth(data);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	304 setPixelData(result, imageData);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	305 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	306 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	307 * Read the image data from the data stream. This must handle
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	308 * decoding the data, filtering, and interlacing.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	309 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	310 void readPixelData(PngIdatChunk chunk, PngChunkReader chunkReader) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	311 InputStream stream = new PngInputStream(chunk, chunkReader);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	312 //TEMPORARY CODE
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	313 //PORTING_FIXME
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	314 bool use3_2 = true;//System.getProperty("dwt.internal.image.PNGFileFormat_3.2") !is null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	315 InputStream inflaterStream = use3_2 ? null : Compatibility.newInflaterInputStream(stream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	316 if (inflaterStream !is null) {
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 48 diff changeset	317 stream = inflaterStream;
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	318 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	319 stream = new PngDecodingDataStream(stream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	320 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	321 int interlaceMethod = headerChunk.getInterlaceMethod();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	322 if (interlaceMethod is PngIhdrChunk.INTERLACE_METHOD_NONE) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	323 readNonInterlacedImage(stream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	324 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	325 readInterlacedImage(stream);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	326 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	327 /*
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	328 * InflaterInputStream does not consume all bytes in the stream
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	329 * when it is closed. This may leave unread IDAT chunks. The fix
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	330 * is to read all available bytes before closing it.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	331 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	332 while (stream.available() > 0) stream.read();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	333 stream.close();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	334 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	335 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	336 * Answer the number of bytes in a word-aligned row of pixel data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	337 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	338 int getAlignedBytesPerRow() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	339 return ((getBytesPerRow(headerChunk.getWidth()) + 3) / 4) * 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	340 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	341 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	342 * Answer the number of bytes in each row of the image
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	343 * data. Each PNG row is byte-aligned, so images with bit
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	344 * depths less than a byte may have unused bits at the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	345 * end of each row. The value of these bits is undefined.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	346 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	347 int getBytesPerRow() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	348 return getBytesPerRow(headerChunk.getWidth());
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	349 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	350 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	351 * Answer the number of bytes needed to represent a pixel.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	352 * This value depends on the image's color type and bit
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	353 * depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	354 * Note that this method rounds up if an image's pixel size
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	355 * isn't byte-aligned.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	356 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	357 int getBytesPerPixel() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	358 int bitsPerPixel = headerChunk.getBitsPerPixel();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	359 return (bitsPerPixel + 7) / 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	360 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	361 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	362 * Answer the number of bytes in a row of the given pixel
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	363 * width. Each row is byte-aligned, so images with bit
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	364 * depths less than a byte may have unused bits at the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	365 * end of each row. The value of these bits is undefined.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	366 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	367 int getBytesPerRow(int rowWidthInPixels) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	368 int bitsPerPixel = headerChunk.getBitsPerPixel();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	369 int bitsPerRow = bitsPerPixel * rowWidthInPixels;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	370 int bitsPerByte = 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	371 return (bitsPerRow + (bitsPerByte - 1)) / bitsPerByte;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	372 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	373 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	374 * 1. Read one of the seven frames of interlaced data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	375 * 2. Update the imageData.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	376 * 3. Notify the image loader's listeners of the frame load.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	377 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	378 void readInterlaceFrame(
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	379 InputStream inputStream,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	380 int rowInterval,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	381 int columnInterval,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	382 int startRow,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	383 int startColumn,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	384 int frameCount)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	385 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	386 int width = headerChunk.getWidth();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	387 int alignedBytesPerRow = getAlignedBytesPerRow();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	388 int height = headerChunk.getHeight();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	389 if (startRow >= height \|\| startColumn >= width) return;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	390
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	391 int pixelsPerRow = (width - startColumn + columnInterval - 1) / columnInterval;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	392 int bytesPerRow = getBytesPerRow(pixelsPerRow);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	393 byte[] row1 = new byte[bytesPerRow];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	394 byte[] row2 = new byte[bytesPerRow];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	395 byte[] currentRow = row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	396 byte[] lastRow = row2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	397 for (int row = startRow; row < height; row += rowInterval) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	398 byte filterType = cast(byte)inputStream.read();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	399 int read = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	400 while (read !is bytesPerRow) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	401 read += inputStream.read(currentRow, read, bytesPerRow - read);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	402 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	403 filterRow(currentRow, lastRow, filterType);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	404 if (headerChunk.getBitDepth() >= 8) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	405 int bytesPerPixel = getBytesPerPixel();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	406 int dataOffset = (row * alignedBytesPerRow) + (startColumn * bytesPerPixel);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	407 for (int rowOffset = 0; rowOffset < currentRow.length; rowOffset += bytesPerPixel) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	408 for (int byteOffset = 0; byteOffset < bytesPerPixel; byteOffset++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	409 data[dataOffset + byteOffset] = currentRow[rowOffset + byteOffset];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	410 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	411 dataOffset += (columnInterval * bytesPerPixel);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	412 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	413 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	414 int bitsPerPixel = headerChunk.getBitDepth();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	415 int pixelsPerByte = 8 / bitsPerPixel;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	416 int column = startColumn;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	417 int rowBase = row * alignedBytesPerRow;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	418 int valueMask = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	419 for (int i = 0; i < bitsPerPixel; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	420 valueMask <<= 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	421 valueMask \|= 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	422 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	423 int maxShift = 8 - bitsPerPixel;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	424 for (int byteOffset = 0; byteOffset < currentRow.length; byteOffset++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	425 for (int bitOffset = maxShift; bitOffset >= 0; bitOffset -= bitsPerPixel) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	426 if (column < width) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	427 int dataOffset = rowBase + (column * bitsPerPixel / 8);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	428 int value = (currentRow[byteOffset] >> bitOffset) & valueMask;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	429 int dataShift = maxShift - (bitsPerPixel * (column % pixelsPerByte));
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	430 data[dataOffset] \|= value << dataShift;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	431 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	432 column += columnInterval;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	433 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	434 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	435 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	436 currentRow = (currentRow is row1) ? row2 : row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	437 lastRow = (lastRow is row1) ? row2 : row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	438 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	439 setImageDataValues(data, imageData);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	440 fireInterlacedFrameEvent(frameCount);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	441 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	442 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	443 * Read the pixel data for an interlaced image from the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	444 * data stream.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	445 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	446 void readInterlacedImage(InputStream inputStream) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	447 readInterlaceFrame(inputStream, 8, 8, 0, 0, 0);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	448 readInterlaceFrame(inputStream, 8, 8, 0, 4, 1);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	449 readInterlaceFrame(inputStream, 8, 4, 4, 0, 2);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	450 readInterlaceFrame(inputStream, 4, 4, 0, 2, 3);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	451 readInterlaceFrame(inputStream, 4, 2, 2, 0, 4);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	452 readInterlaceFrame(inputStream, 2, 2, 0, 1, 5);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	453 readInterlaceFrame(inputStream, 2, 1, 1, 0, 6);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	454 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	455 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	456 * Fire an event to let listeners know that an interlaced
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	457 * frame has been loaded.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	458 * finalFrame should be true if the image has finished
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	459 * loading, false if there are more frames to come.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	460 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	461 void fireInterlacedFrameEvent(int frameCount) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	462 if (loader.hasListeners()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	463 ImageData image = cast(ImageData) imageData.clone();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	464 bool finalFrame = frameCount is 6;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	465 loader.notifyListeners(new ImageLoaderEvent(loader, image, frameCount, finalFrame));
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	466 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	467 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	468 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	469 * Read the pixel data for a non-interlaced image from the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	470 * data stream.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	471 * Update the imageData to reflect the new data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	472 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	473 void readNonInterlacedImage(InputStream inputStream) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	474 int dataOffset = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	475 int alignedBytesPerRow = getAlignedBytesPerRow();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	476 int bytesPerRow = getBytesPerRow();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	477 byte[] row1 = new byte[bytesPerRow];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	478 byte[] row2 = new byte[bytesPerRow];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	479 byte[] currentRow = row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	480 byte[] lastRow = row2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	481 int height = headerChunk.getHeight();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	482 for (int row = 0; row < height; row++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	483 byte filterType = cast(byte)inputStream.read();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	484 int read = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	485 while (read !is bytesPerRow) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	486 read += inputStream.read(currentRow, read, bytesPerRow - read);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	487 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	488 filterRow(currentRow, lastRow, filterType);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	489 System.arraycopy(currentRow, 0, data, dataOffset, bytesPerRow);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	490 dataOffset += alignedBytesPerRow;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	491 currentRow = (currentRow is row1) ? row2 : row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	492 lastRow = (lastRow is row1) ? row2 : row1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	493 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	494 setImageDataValues(data, imageData);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	495 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	496 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	497 * DWT does not support 16-bit depth color formats.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	498 * Convert the 16-bit data to 8-bit data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	499 * The correct way to do this is to multiply each
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	500 * 16 bit value by the value:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	501 * (2^8 - 1) / (2^16 - 1).
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	502 * The fast way to do this is just to drop the low
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	503 * byte of the 16-bit value.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	504 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	505 static void compress16BitDepthTo8BitDepth(
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	506 byte[] source,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	507 int sourceOffset,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	508 byte[] destination,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	509 int destinationOffset,
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	510 int numberOfValues)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	511 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	512 //double multiplier = (Compatibility.pow2(8) - 1) / (Compatibility.pow2(16) - 1);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	513 for (int i = 0; i < numberOfValues; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	514 int sourceIndex = sourceOffset + (2 * i);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	515 int destinationIndex = destinationOffset + i;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	516 //int value = (source[sourceIndex] << 8) \| source[sourceIndex + 1];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	517 //byte compressedValue = (byte)(value * multiplier);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	518 byte compressedValue = source[sourceIndex];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	519 destination[destinationIndex] = compressedValue;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	520 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	521 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	522 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	523 * DWT does not support 16-bit depth color formats.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	524 * Convert the 16-bit data to 8-bit data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	525 * The correct way to do this is to multiply each
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	526 * 16 bit value by the value:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	527 * (2^8 - 1) / (2^16 - 1).
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	528 * The fast way to do this is just to drop the low
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	529 * byte of the 16-bit value.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	530 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	531 static int compress16BitDepthTo8BitDepth(int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	532 //double multiplier = (Compatibility.pow2(8) - 1) / (Compatibility.pow2(16) - 1);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	533 //byte compressedValue = (byte)(value * multiplier);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	534 return value >> 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	535 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	536 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	537 * PNG supports four filtering types. These types are applied
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	538 * per row of image data. This method unfilters the given row
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	539 * based on the filterType.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	540 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	541 void filterRow(byte[] row, byte[] previousRow, int filterType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	542 int byteOffset = headerChunk.getFilterByteOffset();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	543 switch (filterType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	544 case PngIhdrChunk.FILTER_NONE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	545 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	546 case PngIhdrChunk.FILTER_SUB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	547 for (int i = byteOffset; i < row.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	548 int current = row[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	549 int left = row[i - byteOffset] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	550 row[i] = cast(byte)((current + left) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	551 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	552 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	553 case PngIhdrChunk.FILTER_UP:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	554 for (int i = 0; i < row.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	555 int current = row[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	556 int above = previousRow[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	557 row[i] = cast(byte)((current + above) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	558 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	559 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	560 case PngIhdrChunk.FILTER_AVERAGE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	561 for (int i = 0; i < row.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	562 int left = (i < byteOffset) ? 0 : row[i - byteOffset] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	563 int above = previousRow[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	564 int current = row[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	565 row[i] = cast(byte)((current + ((left + above) / 2)) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	566 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	567 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	568 case PngIhdrChunk.FILTER_PAETH:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	569 for (int i = 0; i < row.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	570 int left = (i < byteOffset) ? 0 : row[i - byteOffset] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	571 int aboveLeft = (i < byteOffset) ? 0 : previousRow[i - byteOffset] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	572 int above = previousRow[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	573
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	574 int a = Math.abs(above - aboveLeft);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	575 int b = Math.abs(left - aboveLeft);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	576 int c = Math.abs(left - aboveLeft + above - aboveLeft);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	577
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	578 int preductor = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	579 if (a <= b && a <= c) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	580 preductor = left;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	581 } else if (b <= c) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	582 preductor = above;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	583 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	584 preductor = aboveLeft;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	585 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	586
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	587 int currentValue = row[i] & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	588 row[i] = cast(byte) ((currentValue + preductor) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	589 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	590 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	591 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	592 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	593 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	594
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	595 }

Mercurial > projects > dwt-win

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