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SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.
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/*******************************************************************************
 * Copyright (c) 2007, 2012 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.internal.ole.win32.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.*;

/**
 * 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 CF_DIB = "CF_DIB"; //$NON-NLS-1$
private static final int CF_DIBID = COM.CF_DIB;
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
*/
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);
int imageSize = imgData.data.length;
int imageHeight = imgData.height;
int bytesPerLine = imgData.bytesPerLine;
BITMAPINFOHEADER bmiHeader = new BITMAPINFOHEADER();
bmiHeader.biSize = BITMAPINFOHEADER.sizeof;
bmiHeader.biSizeImage = imageSize;
bmiHeader.biWidth = imgData.width;
bmiHeader.biHeight = imageHeight;
bmiHeader.biPlanes = 1;
bmiHeader.biBitCount = (short)imgData.depth;
bmiHeader.biCompression = OS.DIB_RGB_COLORS;
int colorSize = 0;
if (bmiHeader.biBitCount <= 8) {
colorSize += (1 << bmiHeader.biBitCount) * 4;
}
byte[] bmi = new byte[BITMAPINFOHEADER.sizeof + colorSize];
OS.MoveMemory(bmi, bmiHeader, BITMAPINFOHEADER.sizeof);
RGB[] rgbs = imgData.palette.getRGBs();
if (rgbs != null && colorSize > 0) {
int offset = BITMAPINFOHEADER.sizeof;
for (int j = 0; j < rgbs.length; j++) {
bmi[offset] = (byte)rgbs[j].blue;
bmi[offset + 1] = (byte)rgbs[j].green;
bmi[offset + 2] = (byte)rgbs[j].red;
bmi[offset + 3] = 0;
offset += 4;
}
}
long /*int*/ newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, BITMAPINFOHEADER.sizeof + colorSize + imageSize);
OS.MoveMemory(newPtr, bmi, bmi.length);
long /*int*/ pBitDest = newPtr + BITMAPINFOHEADER.sizeof + colorSize;
if (imageHeight <= 0) {
OS.MoveMemory(pBitDest, imgData.data, imageSize);
} else {
int offset = 0;
pBitDest += bytesPerLine * (imageHeight - 1);
byte[] scanline = new byte[bytesPerLine];
for (int i = 0; i < imageHeight; i++) {
System.arraycopy(imgData.data, offset, scanline, 0, bytesPerLine);
OS.MoveMemory(pBitDest, scanline, bytesPerLine);
offset += bytesPerLine;
pBitDest -= bytesPerLine;
}
}
transferData.stgmedium = new STGMEDIUM();
transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.stgmedium.unionField = newPtr;
transferData.stgmedium.pUnkForRelease = 0;
transferData.result = COM.S_OK;
}
/**
* 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
*/
public Object nativeToJava(TransferData transferData) {
if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;
IDataObject dataObject = new IDataObject(transferData.pIDataObject);
dataObject.AddRef();
FORMATETC formatetc = new FORMATETC();
formatetc.cfFormat = COM.CF_DIB;
formatetc.ptd = 0;
formatetc.dwAspect = COM.DVASPECT_CONTENT;
formatetc.lindex = -1;
formatetc.tymed = COM.TYMED_HGLOBAL;
STGMEDIUM stgmedium = new STGMEDIUM();
stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.result = getData(dataObject, formatetc, stgmedium);
if (transferData.result != COM.S_OK) return null;
long /*int*/ hMem = stgmedium.unionField;
dataObject.Release();
try {
long /*int*/ ptr = OS.GlobalLock(hMem);
if (ptr == 0) return null;
try {
BITMAPINFOHEADER bmiHeader = new BITMAPINFOHEADER();
OS.MoveMemory(bmiHeader, ptr, BITMAPINFOHEADER.sizeof);
long /*int*/[] pBits = new long /*int*/[1];
long /*int*/ memDib = OS.CreateDIBSection(0, ptr, OS.DIB_RGB_COLORS, pBits, 0, 0);
if (memDib == 0) SWT.error(SWT.ERROR_NO_HANDLES);
long /*int*/ bits = ptr + bmiHeader.biSize;
if (bmiHeader.biBitCount <= 8) {
bits += (bmiHeader.biClrUsed == 0 ? (1 << bmiHeader.biBitCount) : bmiHeader.biClrUsed) * 4;
} else if (bmiHeader.biCompression == OS.BI_BITFIELDS) {
bits += 12;
}
if (bmiHeader.biHeight < 0) {
OS.MoveMemory(pBits[0], bits, bmiHeader.biSizeImage);
} else {
DIBSECTION dib = new DIBSECTION();
OS.GetObject(memDib, DIBSECTION.sizeof, dib);
int biHeight = dib.biHeight;
int scanline = dib.biSizeImage / biHeight;
long /*int*/ pDestBits = pBits[0];
long /*int*/ pSourceBits = bits + scanline * (biHeight - 1);
for (int i = 0; i < biHeight; i++) {
OS.MoveMemory(pDestBits, pSourceBits, scanline);
pDestBits += scanline;
pSourceBits -= scanline;
}
}
Image image = Image.win32_new(null, SWT.BITMAP, memDib);
ImageData data = image.getImageData();
OS.DeleteObject(memDib);
image.dispose();
return data;
} finally {
OS.GlobalUnlock(hMem);
}
} finally {
OS.GlobalFree(hMem);
}
}
protected int[] getTypeIds(){
return new int[] {CF_DIBID};
}
protected String[] getTypeNames(){
return new String[] {CF_DIB};
}
boolean checkImage(Object object) {
if (object == null || !(object instanceof ImageData)) return false;
return true;
}
protected boolean validate(Object object) {
return checkImage(object);
}
}