| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| package org.eclipse.swt.internal.image; |
| |
| |
| import java.io.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * Abstract factory class for loading/unloading images from files or streams |
| * in various image file formats. |
| * |
| */ |
| public abstract class FileFormat { |
| static final String FORMAT_PACKAGE = "org.eclipse.swt.internal.image"; //$NON-NLS-1$ |
| static final String FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$ |
| static final String[] FORMATS = {"WinBMP", "WinBMP", "GIF", "WinICO", "JPEG", "PNG", "TIFF", "OS2BMP"}; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$ //$NON-NLS-6$//$NON-NLS-7$//$NON-NLS-8$ |
| |
| LEDataInputStream inputStream; |
| LEDataOutputStream outputStream; |
| ImageLoader loader; |
| int compression; |
| |
| /** |
| * Return whether or not the specified input stream |
| * represents a supported file format. |
| */ |
| abstract boolean 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 (Exception e) { |
| if (e instanceof IOException) { |
| SWT.error(SWT.ERROR_IO, e); |
| } else { |
| SWT.error(SWT.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 is, ImageLoader loader) { |
| FileFormat fileFormat = null; |
| LEDataInputStream stream = new LEDataInputStream(is); |
| boolean isSupported = false; |
| for (int i = 1; i < FORMATS.length; i++) { |
| if (FORMATS[i] != null) { |
| try { |
| Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[i] + FORMAT_SUFFIX); |
| fileFormat = (FileFormat) clazz.newInstance(); |
| if (fileFormat.isFileFormat(stream)) { |
| isSupported = true; |
| break; |
| } |
| } catch (ClassNotFoundException e) { |
| FORMATS[i] = null; |
| } catch (Exception e) { |
| } |
| } |
| } |
| if (!isSupported) SWT.error(SWT.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) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); |
| if (FORMATS[format] == null) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); |
| if (loader.data == null || loader.data.length < 1) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| |
| LEDataOutputStream stream = new LEDataOutputStream(os); |
| FileFormat fileFormat = null; |
| try { |
| Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[format] + FORMAT_SUFFIX); |
| fileFormat = (FileFormat) clazz.newInstance(); |
| } catch (Exception e) { |
| SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); |
| } |
| if (format == SWT.IMAGE_BMP_RLE) { |
| switch (loader.data[0].depth) { |
| case 8: fileFormat.compression = 1; break; |
| case 4: fileFormat.compression = 2; break; |
| } |
| } |
| 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 (Exception e) { |
| try {outputStream.flush();} catch (Exception f) {} |
| SWT.error(SWT.ERROR_IO, e); |
| } |
| } |
| } |