Mercurial > projects > dwt-win
view dwt/internal/image/TIFFFileFormat.d @ 341:f403c83322c3 default tip
fix: thx torhu
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 08 Nov 2009 20:58:32 +0100 |
parents | fd9c62a2998e |
children |
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/******************************************************************************* * Copyright (c) 2000, 2008 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.TIFFFileFormat; import dwt.internal.image.TIFFRandomFileAccess; import dwt.internal.image.TIFFDirectory; import dwt.DWT; import dwt.graphics.ImageData; import dwt.graphics.ImageLoader; import dwt.internal.image.FileFormat; import tango.core.Exception; /** * Baseline TIFF decoder revision 6.0 * Extension T4-encoding CCITT T.4 1D */ final class TIFFFileFormat : FileFormat { override bool isFileFormat(LEDataInputStream stream) { try { byte[] header = new byte[4]; stream.read(header); stream.unread(header); if (header[0] !is header[1]) return false; if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) && !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) { return false; } return true; } catch (Exception e) { return false; } } override ImageData[] loadFromByteStream() { byte[] header = new byte[8]; bool isLittleEndian; ImageData[] images = new ImageData[0]; TIFFRandomFileAccess file = new TIFFRandomFileAccess(inputStream); try { file.read(header); if (header[0] !is header[1]) DWT.error(DWT.ERROR_INVALID_IMAGE); if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) && !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) { DWT.error(DWT.ERROR_INVALID_IMAGE); } isLittleEndian = header[0] is 0x49; int offset = isLittleEndian ? (header[4] & 0xFF) | ((header[5] & 0xFF) << 8) | ((header[6] & 0xFF) << 16) | ((header[7] & 0xFF) << 24) : (header[7] & 0xFF) | ((header[6] & 0xFF) << 8) | ((header[5] & 0xFF) << 16) | ((header[4] & 0xFF) << 24); file.seek(offset); TIFFDirectory directory = new TIFFDirectory(file, isLittleEndian, loader); ImageData image = directory.read(); /* A baseline reader is only expected to read the first directory */ images = [image]; } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } return images; } override void unloadIntoByteStream(ImageLoader loader) { /* We do not currently support writing multi-page tiff, * so we use the first image data in the loader's array. */ ImageData image = loader.data[0]; TIFFDirectory directory = new TIFFDirectory(image); try { directory.writeToStream(outputStream); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } } }