/*******************************************************************************
 * 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
 *******************************************************************************/
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.SWT;

public import dwt.dwthelper.InputStream;
public import dwt.dwthelper.OutputStream;

/+
import dwt.internal.image.WinBMPFileFormat;
import dwt.internal.image.GIFFileFormat;
import dwt.internal.image.WinICOFileFormat;
import dwt.internal.image.JPEGFileFormat;
import dwt.internal.image.PNGFileFormat;
import dwt.internal.image.TIFFFileFormat;
import dwt.internal.image.OS2BMPFileFormat;
+/

import tango.core.Exception;
import tango.core.Tuple;

class Tmp : FileFormat{
    bool isFileFormat(LEDataInputStream stream){
        return false;
    }
    ImageData[] loadFromByteStream(){
        return null;
    }
    void unloadIntoByteStream(ImageLoader loader){
    }
}
class WinBMPFileFormat : Tmp{
}
class GIFFileFormat : Tmp{
}
class WinICOFileFormat : Tmp{
}
class JPEGFileFormat : Tmp{
}
class PNGFileFormat : Tmp{
}
class TIFFFileFormat : Tmp{
}
class OS2BMPFileFormat : Tmp{
}

/**
 * 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) {
        SWT.error(SWT.ERROR_IO, e);
        return null;
    } catch (TracedException e) {
        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 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) 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 {
        foreach( idx, TFormat; TFormats ){
            if( idx == format ){
                fileFormat = new TFormat();
            }
        }
	} catch (TracedException 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 (TracedException e) {
		try {outputStream.flush();} catch (Exception f) {}
		SWT.error(SWT.ERROR_IO, e);
	}
}
}