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/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.widgets.*;
/**
* The class ImageTransfer
provides a platform specific mechanism
* for converting an Image represented as a java ImageData
to a
* platform specific representation of the data and vice versa.
*
* An example of a java ImageData
is shown below:
*
*
* Image image = new Image(display, "C:\\temp\\img1.gif");
* ImageData imgData = image.getImageData();
*
*
* @see Transfer
*
* @since 3.4
*/
public class ImageTransfer extends ByteArrayTransfer {
private static ImageTransfer _instance = new ImageTransfer();
private static final String JPEG = "image/jpeg"; //$NON-NLS-1$
private static final int JPEG_ID = GTK.GTK4 ? 0: registerType(JPEG);
private static final String PNG = "image/png"; //$NON-NLS-1$
private static final int PNG_ID = GTK.GTK4 ? 0:registerType(PNG);
private static final String BMP = "image/bmp"; //$NON-NLS-1$
private static final int BMP_ID = GTK.GTK4 ? 0:registerType(BMP);
private static final String EPS = "image/eps"; //$NON-NLS-1$
private static final int EPS_ID = GTK.GTK4 ? 0:registerType(EPS);
private static final String PCX = "image/pcx"; //$NON-NLS-1$
private static final int PCX_ID = GTK.GTK4 ? 0:registerType(PCX);
private static final String PPM = "image/ppm"; //$NON-NLS-1$
private static final int PPM_ID = GTK.GTK4 ? 0:registerType(PPM);
private static final String RGB = "image/ppm"; //$NON-NLS-1$
private static final int RGB_ID = GTK.GTK4 ? 0:registerType(RGB);
private static final String TGA = "image/tga"; //$NON-NLS-1$
private static final int TGA_ID = GTK.GTK4 ? 0:registerType(TGA);
private static final String XBM = "image/xbm"; //$NON-NLS-1$
private static final int XBM_ID = GTK.GTK4 ? 0:registerType(XBM);
private static final String XPM = "image/xpm"; //$NON-NLS-1$
private static final int XPM_ID = GTK.GTK4 ? 0:registerType(XPM);
private static final String XV = "image/xv"; //$NON-NLS-1$
private static final int XV_ID = GTK.GTK4 ? 0:registerType(XV);
private ImageTransfer() {}
/**
* Returns the singleton instance of the ImageTransfer class.
*
* @return the singleton instance of the ImageTransfer class
*/
public static ImageTransfer getInstance () {
return _instance;
}
/**
* This implementation of javaToNative
converts an ImageData object represented
* by java ImageData
to a platform specific representation.
*
* @param object a java ImageData
containing the ImageData to be converted
* @param transferData an empty TransferData
object that will
* be filled in on return with the platform specific format of the data
*
* @see Transfer#nativeToJava
*/
@Override
public void javaToNative(Object object, TransferData transferData) {
if (!checkImage(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
ImageData imgData = (ImageData)object;
if (imgData == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
Image image = new Image(Display.getCurrent(), imgData);
long pixbuf = ImageList.createPixbuf(image);
if (pixbuf != 0) {
String typeStr = "";
if (transferData.type == JPEG_ID) typeStr = "jpeg";
else if (transferData.type == PNG_ID) typeStr = "png";
else if (transferData.type == BMP_ID) typeStr = "bmp";
else if (transferData.type == EPS_ID) typeStr = "eps";
else if (transferData.type == PCX_ID) typeStr = "pcx";
else if (transferData.type == PPM_ID) typeStr = "ppm";
else if (transferData.type == RGB_ID) typeStr = "rgb";
else if (transferData.type == TGA_ID) typeStr = "tga";
else if (transferData.type == XBM_ID) typeStr = "xbm";
else if (transferData.type == XPM_ID) typeStr = "xpm";
else if (transferData.type == XV_ID) typeStr = "xv";
byte[] type = Converter.wcsToMbcs(typeStr, true);
long [] buffer = new long [1];
long [] len = new long [1];
if (type == null) return;
GDK.gdk_pixbuf_save_to_bufferv(pixbuf, buffer, len, type, null, null, null);
OS.g_object_unref(pixbuf);
transferData.pValue = buffer[0];
transferData.length = (int)(len[0] + 3) / 4 * 4;
transferData.result = 1;
// The following value has been changed from 32 to 8 as a simple fix for #146
// See https://www.cc.gatech.edu/data_files/public/doc/gtk/tutorial/gtk_tut-16.html where it states:
// "The format field is actually important here - the X server uses it to figure out whether the data
// needs to be byte-swapped or not. Usually it will be 8 - i.e. a character - or 32 - i.e. a. integer."
transferData.format = 8;
}
image.dispose();
}
/**
* This implementation of nativeToJava
converts a platform specific
* representation of an image to java ImageData
.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java ImageData
of the image if the conversion was successful;
* otherwise null
*
* @see Transfer#javaToNative
*/
@Override
public Object nativeToJava(TransferData transferData) {
ImageData imgData = null;
if (transferData.length > 0) {
long loader = GDK.gdk_pixbuf_loader_new();
try {
GDK.gdk_pixbuf_loader_write(loader, transferData.pValue, transferData.length, null);
GDK.gdk_pixbuf_loader_close(loader, null);
long pixbuf = GDK.gdk_pixbuf_loader_get_pixbuf(loader);
if (pixbuf != 0) {
Image img = Image.gtk_new_from_pixbuf(Display.getCurrent(), SWT.BITMAP, pixbuf);
imgData = img.getImageData();
img.dispose();
}
} finally {
OS.g_object_unref(loader);
}
}
return imgData;
}
@Override
protected int[] getTypeIds(){
if(GTK.GTK4) {
return new int[] {(int) GDK.GDK_TYPE_PIXBUF()};
}
return new int[]{PNG_ID, BMP_ID, EPS_ID, JPEG_ID, PCX_ID, PPM_ID, RGB_ID, TGA_ID, XBM_ID, XPM_ID, XV_ID};
}
@Override
protected String[] getTypeNames(){
if(GTK.GTK4) {
return new String[]{"PIXBUF"};
}
return new String[]{PNG, BMP, EPS, JPEG, PCX, PPM, RGB, TGA, XBM, XPM, XV};
}
boolean checkImage(Object object) {
if (!(object instanceof ImageData)) return false;
return true;
}
@Override
protected boolean validate(Object object) {
return checkImage(object);
}
}
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