| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.dnd; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.Converter; |
| import org.eclipse.swt.internal.gtk.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * The class <code>ImageTransfer</code> provides a platform specific mechanism |
| * for converting an Image represented as a java <code>ImageData</code> to a |
| * platform specific representation of the data and vice versa. |
| * |
| * <p>An example of a java <code>ImageData</code> is shown below:</p> |
| * |
| * <code><pre> |
| * Image image = new Image(display, "C:\temp\img1.gif"); |
| * ImageData imgData = image.getImageData(); |
| * </code></pre> |
| * |
| * @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 = registerType(JPEG); |
| private static final String PNG = "image/png"; //$NON-NLS-1$ |
| private static final int PNG_ID = registerType(PNG); |
| private static final String BMP = "image/bmp"; //$NON-NLS-1$ |
| private static final int BMP_ID = registerType(BMP); |
| private static final String EPS = "image/eps"; //$NON-NLS-1$ |
| private static final int EPS_ID = registerType(EPS); |
| private static final String PCX = "image/pcx"; //$NON-NLS-1$ |
| private static final int PCX_ID = registerType(PCX); |
| private static final String PPM = "image/ppm"; //$NON-NLS-1$ |
| private static final int PPM_ID = registerType(PPM); |
| private static final String RGB = "image/ppm"; //$NON-NLS-1$ |
| private static final int RGB_ID = registerType(RGB); |
| private static final String TGA = "image/tga"; //$NON-NLS-1$ |
| private static final int TGA_ID = registerType(TGA); |
| private static final String XBM = "image/xbm"; //$NON-NLS-1$ |
| private static final int XBM_ID = registerType(XBM); |
| private static final String XPM = "image/xpm"; //$NON-NLS-1$ |
| private static final int XPM_ID = registerType(XPM); |
| private static final String XV = "image/xv"; //$NON-NLS-1$ |
| private static final int XV_ID = 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 <code>javaToNative</code> converts an ImageData object represented |
| * by java <code>ImageData</code> to a platform specific representation. |
| * |
| * @param object a java <code>ImageData</code> containing the ImageData to be converted |
| * @param transferData an empty <code>TransferData</code> object that will |
| * be filled in on return with the platform specific format of the data |
| * |
| * @see Transfer#nativeToJava |
| */ |
| public void javaToNative(Object object, TransferData transferData) { |
| if (!checkImage(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| if (OS.GTK_VERSION < OS.VERSION (2, 4, 0)) return; |
| |
| ImageData imgData = (ImageData)object; |
| if (imgData == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| Image image = new Image(Display.getCurrent(), imgData); |
| int /*long*/ pixmap = image.pixmap; |
| int width = imgData.width; |
| int height = imgData.height; |
| int /*long*/ pixbuf = OS.gdk_pixbuf_new(OS.GDK_COLORSPACE_RGB, true, 8, width, height); |
| if (pixbuf == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int /*long*/ colormap = OS.gdk_colormap_get_system(); |
| OS.gdk_pixbuf_get_from_drawable(pixbuf, pixmap, colormap, 0, 0, 0, 0, width, height); |
| |
| String typeStr = ""; |
| if (transferData.type == JPEG_ID) typeStr = "jpeg"; |
| if (transferData.type == PNG_ID) typeStr = "png"; |
| if (transferData.type == BMP_ID) typeStr = "bmp"; |
| if (transferData.type == EPS_ID) typeStr = "eps"; |
| if (transferData.type == PCX_ID) typeStr = "pcx"; |
| if (transferData.type == PPM_ID) typeStr = "ppm"; |
| if (transferData.type == RGB_ID) typeStr = "rgb"; |
| if (transferData.type == TGA_ID) typeStr = "tga"; |
| if (transferData.type == XBM_ID) typeStr = "xbm"; |
| if (transferData.type == XPM_ID) typeStr = "xpm"; |
| if (transferData.type == XV_ID) typeStr = "xv"; |
| byte[] type = Converter.wcsToMbcs(null, typeStr , true); |
| int /*long*/ [] buffer = new int /*long*/ [1]; |
| int /*long*/ [] len = new int /*long*/ [1]; |
| if (type == null) return; |
| OS.gdk_pixbuf_save_to_bufferv(pixbuf, buffer, len, type, null, null, null); |
| OS.g_object_unref(pixbuf); |
| image.dispose(); |
| transferData.pValue = buffer[0]; |
| transferData.length = (int)(len[0] + 3) / 4 * 4; |
| transferData.result = 1; |
| transferData.format = 32; |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of an image to java <code>ImageData</code>. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>ImageData</code> of the image if the conversion was successful; |
| * otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| public Object nativeToJava(TransferData transferData) { |
| ImageData imgData = null; |
| if (transferData.length > 0) |
| { |
| int /*long*/ loader = OS.gdk_pixbuf_loader_new(); |
| OS.gdk_pixbuf_loader_write(loader, transferData.pValue, transferData.length, null); |
| OS.gdk_pixbuf_loader_close(loader, null); |
| int /*long*/ pixbuf = OS.gdk_pixbuf_loader_get_pixbuf(loader); |
| if (pixbuf != 0) { |
| OS.g_object_ref(pixbuf); |
| int /*long*/ [] pixmap_return = new int /*long*/ [1]; |
| OS.gdk_pixbuf_render_pixmap_and_mask(pixbuf, pixmap_return, null, 0); |
| int /*long*/ handle = pixmap_return[0]; |
| if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| OS.g_object_unref(loader); |
| Image img = Image.gtk_new(Display.getCurrent(), SWT.BITMAP, handle, 0); |
| imgData = img.getImageData(); |
| img.dispose(); |
| } |
| } |
| return imgData; |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[]{JPEG_ID, PNG_ID, BMP_ID, EPS_ID, PCX_ID, PPM_ID, RGB_ID, TGA_ID, XBM_ID, XPM_ID, XV_ID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[]{JPEG, PNG, BMP, EPS, PCX, PPM, RGB, TGA, XBM, XPM, XV}; |
| } |
| |
| boolean checkImage(Object object) { |
| if (object == null || !(object instanceof ImageData)) return false; |
| return true; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkImage(object); |
| } |
| } |