Mercurial > projects > dwt-win
view dwt/dnd/ImageTransfer.d @ 213:36f5cb12e1a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 17 May 2008 17:34:28 +0200 |
parents | |
children | e2affbeb686d |
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/******************************************************************************* * Copyright (c) 2007 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.dnd.ImageTransfer; import dwt.DWT; import dwt.graphics.Image; import dwt.graphics.ImageData; import dwt.graphics.RGB; import dwt.internal.win32.OS; import dwt.internal.ole.win32.COM; import dwt.internal.ole.win32.OBJIDL; import dwt.dnd.ByteArrayTransfer; import dwt.dnd.TransferData; import dwt.dnd.DND; import dwt.dwthelper.utils; /** * The class <code>ImageTransfer</code> provides a platform specific mechanism * for converting a Image represented as a java <code>ImageData</code> to a * platform specific representation of the data and vice versa. * See <code>Transfer</code> for additional information. * * <p>An example of a java <code>ImageData</code> is shown * below:</p> * * <code><pre> * Image image = new Image("C:\temp\img1.gif"); * ImageData imgData = image.getImageData(); * </code></pre> * * @since 3.4 */ public class ImageTransfer : ByteArrayTransfer { private static ImageTransfer _instance; private static const String CF_DIB = "CF_DIB"; //$NON-NLS-1$ private static const int CF_DIBID = COM.CF_DIB; static this(){ _instance = new ImageTransfer(); } private this() { } /** * 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. * For additional information see <code>Transfer#javaToNative</code>. * * @param object a java <code>ImageData</code> containing the ImageData to be * converted * @param transferData an empty <code>TransferData</code> object; this * object will be filled in on return with the platform specific format of the data */ public void javaToNative(Object object, TransferData transferData) { if (!checkImage(object) || !isSupportedType(transferData)) { DND.error(DND.ERROR_INVALID_DATA); } ImageData imgData = cast(ImageData)object; if (imgData is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); int imageSize = imgData.data.length; int imageHeight = imgData.height; int bytesPerLine = imgData.bytesPerLine; BITMAPINFOHEADER bmiHeader; bmiHeader.biSize = BITMAPINFOHEADER.sizeof; bmiHeader.biSizeImage = imageSize; bmiHeader.biWidth = imgData.width; bmiHeader.biHeight = imageHeight; bmiHeader.biPlanes = 1; bmiHeader.biBitCount = cast(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.ptr, &bmiHeader, BITMAPINFOHEADER.sizeof); RGB[] rgbs = imgData.palette.getRGBs(); if (rgbs !is null && colorSize > 0) { int offset = BITMAPINFOHEADER.sizeof; for (int j = 0; j < rgbs.length; j++) { bmi[offset] = cast(byte)rgbs[j].blue; bmi[offset + 1] = cast(byte)rgbs[j].green; bmi[offset + 2] = cast(byte)rgbs[j].red; bmi[offset + 3] = 0; offset += 4; } } auto newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, BITMAPINFOHEADER.sizeof + colorSize + imageSize); OS.MoveMemory(newPtr, bmi.ptr, bmi.length); auto pBitDest = newPtr + BITMAPINFOHEADER.sizeof + colorSize; if (imageHeight <= 0) { OS.MoveMemory(pBitDest, imgData.data.ptr, 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.ptr, bytesPerLine); offset += bytesPerLine; pBitDest -= bytesPerLine; } } transferData.stgmedium = new STGMEDIUM(); transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; transferData.stgmedium.unionField = newPtr; transferData.stgmedium.pUnkForRelease = null; transferData.result = COM.S_OK; } /** * This implementation of <code>nativeToJava</code> converts a platform specific * representation of an image to java <code>ImageData</code>. * For additional information see <code>Transfer#nativeToJava</code>. * * @param transferData the platform specific representation of the data to be * been converted * @return a java <code>ImageData</code> of the image if * conversion was successful; otherwise null */ public Object nativeToJava(TransferData transferData) { if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null; IDataObject dataObject = cast(IDataObject)(transferData.pIDataObject); dataObject.AddRef(); FORMATETC* formatetc = new FORMATETC(); formatetc.cfFormat = COM.CF_DIB; formatetc.ptd = null; formatetc.dwAspect = COM.DVASPECT_CONTENT; formatetc.lindex = -1; formatetc.tymed = COM.TYMED_HGLOBAL; STGMEDIUM* stgmedium = new STGMEDIUM(); stgmedium.tymed = COM.TYMED_HGLOBAL; transferData.result = dataObject.GetData(formatetc, stgmedium); if (transferData.result !is COM.S_OK) return null; HANDLE hMem = stgmedium.unionField; dataObject.Release(); try { auto ptr = OS.GlobalLock(hMem); if (ptr is null) return null; try { BITMAPINFOHEADER bmiHeader; OS.MoveMemory(&bmiHeader, ptr, BITMAPINFOHEADER.sizeof); void* pBits; auto memDib = OS.CreateDIBSection(null, cast(BITMAPINFO*)ptr, OS.DIB_RGB_COLORS, &pBits, null, 0); if (memDib is null) DWT.error(DWT.ERROR_NO_HANDLES); void* bits = ptr + bmiHeader.biSize; if (bmiHeader.biBitCount <= 8) { bits += (1 << bmiHeader.biBitCount) * 4; } else if (bmiHeader.biCompression is OS.BI_BITFIELDS) { bits += 12; } if (bmiHeader.biHeight < 0) { OS.MoveMemory(pBits, bits, bmiHeader.biSizeImage); } else { DIBSECTION dib; OS.GetObject(memDib, DIBSECTION.sizeof, &dib); int biHeight = dib.biHeight; int scanline = dib.biSizeImage / biHeight; auto pDestBits = pBits; auto 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, DWT.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 [CF_DIBID]; } protected String[] getTypeNames(){ return [CF_DIB]; } bool checkImage(Object object) { if (object is null || !(null !is cast(ImageData)object )) return false; return true; } protected bool validate(Object object) { return checkImage(object); } }