Mercurial > projects > dwt-win
view dwt/internal/image/FileFormat.d @ 2:57151e2793a2
More common modules from dwt-linux
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 23 Jan 2008 12:01:46 +0100 |
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children | 41dbc4d9faab |
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/******************************************************************************* * Copyright (c) 2000, 2006 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.internal.image.FileFormat; public import dwt.graphics.ImageLoader; public import dwt.graphics.ImageData; public import dwt.internal.image.LEDataInputStream; public import dwt.internal.image.LEDataOutputStream; import dwt.DWT; public import dwt.dwthelper.InputStream; public import dwt.dwthelper.OutputStream; import dwt.internal.image.GIFFileFormat; import dwt.internal.image.WinBMPFileFormat; import dwt.internal.image.WinICOFileFormat; import dwt.internal.image.TIFFFileFormat; import dwt.internal.image.OS2BMPFileFormat; import dwt.internal.image.JPEGFileFormat; import dwt.internal.image.PNGFileFormat; import tango.core.Exception; import tango.core.Tuple; /** * Abstract factory class for loading/unloading images from files or streams * in various image file formats. * */ public abstract class FileFormat { static const char[] FORMAT_PACKAGE = "dwt.internal.image"; //$NON-NLS-1$ static const char[] FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$ static const char[][] FORMATS = [ "WinBMP"[], "WinBMP", "GIF", "WinICO", "JPEG", "PNG", "TIFF", "OS2BMP" ]; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$ //$NON-NLS-6$//$NON-NLS-7$//$NON-NLS-8$ alias Tuple!( WinBMPFileFormat, WinBMPFileFormat, GIFFileFormat, WinICOFileFormat, JPEGFileFormat, PNGFileFormat, TIFFFileFormat, OS2BMPFileFormat ) TFormats; LEDataInputStream inputStream; LEDataOutputStream outputStream; ImageLoader loader; int compression; /** * Return whether or not the specified input stream * represents a supported file format. */ abstract bool isFileFormat(LEDataInputStream stream); abstract ImageData[] loadFromByteStream(); /** * Read the specified input stream, and return the * device independent image array represented by the stream. */ public ImageData[] loadFromStream(LEDataInputStream stream) { try { inputStream = stream; return loadFromByteStream(); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); return null; } catch (TracedException e) { DWT.error(DWT.ERROR_INVALID_IMAGE, e); return null; } } /** * Read the specified input stream using the specified loader, and * return the device independent image array represented by the stream. */ public static ImageData[] load(InputStream istr, ImageLoader loader) { FileFormat fileFormat = null; LEDataInputStream stream = new LEDataInputStream(istr); bool isSupported = false; foreach( TFormat; TFormats ){ try{ fileFormat = new TFormat(); if (fileFormat.isFileFormat(stream)) { isSupported = true; break; } } catch (TracedException e) { } } if (!isSupported) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT); fileFormat.loader = loader; return fileFormat.loadFromStream(stream); } /** * Write the device independent image array stored in the specified loader * to the specified output stream using the specified file format. */ public static void save(OutputStream os, int format, ImageLoader loader) { if (format < 0 || format >= FORMATS.length) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT); if (FORMATS[format] is null) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT); if (loader.data is null || loader.data.length < 1) DWT.error(DWT.ERROR_INVALID_ARGUMENT); LEDataOutputStream stream = new LEDataOutputStream(os); FileFormat fileFormat = null; try { foreach( idx, TFormat; TFormats ){ if( idx is format ){ fileFormat = new TFormat(); } } } catch (TracedException e) { DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT); } if (format is DWT.IMAGE_BMP_RLE) { switch (loader.data[0].depth) { case 8: fileFormat.compression = 1; break; case 4: fileFormat.compression = 2; break; default: } } fileFormat.unloadIntoStream(loader, stream); } abstract void unloadIntoByteStream(ImageLoader loader); /** * Write the device independent image array stored in the specified loader * to the specified output stream. */ public void unloadIntoStream(ImageLoader loader, LEDataOutputStream stream) { try { outputStream = stream; unloadIntoByteStream(loader); outputStream.flush(); } catch (TracedException e) { try {outputStream.flush();} catch (Exception f) {} DWT.error(DWT.ERROR_IO, e); } } }