| /******************************************************************************* |
| * Copyright (c) 2007, 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.internal.ole.win32.*; |
| import org.eclipse.swt.internal.win32.*; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * 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 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 <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); |
| } |
| 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; |
| } |
| } |
| int /*long*/ newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, BITMAPINFOHEADER.sizeof + colorSize + imageSize); |
| OS.MoveMemory(newPtr, bmi, bmi.length); |
| int /*long*/ 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 <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) { |
| 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; |
| int /*long*/ hMem = stgmedium.unionField; |
| dataObject.Release(); |
| try { |
| int /*long*/ ptr = OS.GlobalLock(hMem); |
| if (ptr == 0) return null; |
| try { |
| BITMAPINFOHEADER bmiHeader = new BITMAPINFOHEADER(); |
| OS.MoveMemory(bmiHeader, ptr, BITMAPINFOHEADER.sizeof); |
| int /*long*/[] pBits = new int /*long*/[1]; |
| int /*long*/ memDib = OS.CreateDIBSection(0, ptr, OS.DIB_RGB_COLORS, pBits, 0, 0); |
| if (memDib == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| int /*long*/ 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; |
| int /*long*/ pDestBits = pBits[0]; |
| int /*long*/ 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); |
| } |
| } |