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comparison dwt/dnd/ImageTransfer.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
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212:ab60f3309436 213:36f5cb12e1a2
1 /*******************************************************************************
2 * Copyright (c) 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 module dwt.dnd.ImageTransfer;
12
13 import dwt.DWT;
14 import dwt.graphics.Image;
15 import dwt.graphics.ImageData;
16 import dwt.graphics.RGB;
17 import dwt.internal.win32.OS;
18 import dwt.internal.ole.win32.COM;
19 import dwt.internal.ole.win32.OBJIDL;
20
21 import dwt.dnd.ByteArrayTransfer;
22 import dwt.dnd.TransferData;
23 import dwt.dnd.DND;
24
25 import dwt.dwthelper.utils;
26
27 /**
28 * The class <code>ImageTransfer</code> provides a platform specific mechanism
29 * for converting a Image represented as a java <code>ImageData</code> to a
30 * platform specific representation of the data and vice versa.
31 * See <code>Transfer</code> for additional information.
32 *
33 * <p>An example of a java <code>ImageData</code> is shown
34 * below:</p>
35 *
36 * <code><pre>
37 * Image image = new Image("C:\temp\img1.gif");
38 * ImageData imgData = image.getImageData();
39 * </code></pre>
40 *
41 * @since 3.4
42 */
43 public class ImageTransfer : ByteArrayTransfer {
44
45 private static ImageTransfer _instance;
46 private static const String CF_DIB = "CF_DIB"; //$NON-NLS-1$
47 private static const int CF_DIBID = COM.CF_DIB;
48
49 static this(){
50 _instance = new ImageTransfer();
51 }
52
53 private this() {
54 }
55
56 /**
57 * Returns the singleton instance of the ImageTransfer class.
58 *
59 * @return the singleton instance of the ImageTransfer class
60 */
61 public static ImageTransfer getInstance () {
62 return _instance;
63 }
64
65 /**
66 * This implementation of <code>javaToNative</code> converts an ImageData object represented
67 * by java <code>ImageData</code> to a platform specific representation.
68 * For additional information see <code>Transfer#javaToNative</code>.
69 *
70 * @param object a java <code>ImageData</code> containing the ImageData to be
71 * converted
72 * @param transferData an empty <code>TransferData</code> object; this
73 * object will be filled in on return with the platform specific format of the data
74 */
75 public void javaToNative(Object object, TransferData transferData) {
76 if (!checkImage(object) || !isSupportedType(transferData)) {
77 DND.error(DND.ERROR_INVALID_DATA);
78 }
79 ImageData imgData = cast(ImageData)object;
80 if (imgData is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
81
82 int imageSize = imgData.data.length;
83 int imageHeight = imgData.height;
84 int bytesPerLine = imgData.bytesPerLine;
85
86 BITMAPINFOHEADER bmiHeader;
87 bmiHeader.biSize = BITMAPINFOHEADER.sizeof;
88 bmiHeader.biSizeImage = imageSize;
89 bmiHeader.biWidth = imgData.width;
90 bmiHeader.biHeight = imageHeight;
91 bmiHeader.biPlanes = 1;
92 bmiHeader.biBitCount = cast(short)imgData.depth;
93 bmiHeader.biCompression = OS.DIB_RGB_COLORS;
94
95 int colorSize = 0;
96 if (bmiHeader.biBitCount <= 8) {
97 colorSize += (1 << bmiHeader.biBitCount) * 4;
98 }
99 byte[] bmi = new byte[BITMAPINFOHEADER.sizeof + colorSize];
100 OS.MoveMemory(bmi.ptr, &bmiHeader, BITMAPINFOHEADER.sizeof);
101
102 RGB[] rgbs = imgData.palette.getRGBs();
103 if (rgbs !is null && colorSize > 0) {
104 int offset = BITMAPINFOHEADER.sizeof;
105 for (int j = 0; j < rgbs.length; j++) {
106 bmi[offset] = cast(byte)rgbs[j].blue;
107 bmi[offset + 1] = cast(byte)rgbs[j].green;
108 bmi[offset + 2] = cast(byte)rgbs[j].red;
109 bmi[offset + 3] = 0;
110 offset += 4;
111 }
112 }
113 auto newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, BITMAPINFOHEADER.sizeof + colorSize + imageSize);
114 OS.MoveMemory(newPtr, bmi.ptr, bmi.length);
115 auto pBitDest = newPtr + BITMAPINFOHEADER.sizeof + colorSize;
116
117 if (imageHeight <= 0) {
118 OS.MoveMemory(pBitDest, imgData.data.ptr, imageSize);
119 } else {
120 int offset = 0;
121 pBitDest += bytesPerLine * (imageHeight - 1);
122 byte[] scanline = new byte[bytesPerLine];
123 for (int i = 0; i < imageHeight; i++) {
124 System.arraycopy(imgData.data, offset, scanline, 0, bytesPerLine);
125 OS.MoveMemory(pBitDest, scanline.ptr, bytesPerLine);
126 offset += bytesPerLine;
127 pBitDest -= bytesPerLine;
128 }
129 }
130 transferData.stgmedium = new STGMEDIUM();
131 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
132 transferData.stgmedium.unionField = newPtr;
133 transferData.stgmedium.pUnkForRelease = null;
134 transferData.result = COM.S_OK;
135 }
136
137
138 /**
139 * This implementation of <code>nativeToJava</code> converts a platform specific
140 * representation of an image to java <code>ImageData</code>.
141 * For additional information see <code>Transfer#nativeToJava</code>.
142 *
143 * @param transferData the platform specific representation of the data to be
144 * been converted
145 * @return a java <code>ImageData</code> of the image if
146 * conversion was successful; otherwise null
147 */
148 public Object nativeToJava(TransferData transferData) {
149 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null;
150 IDataObject dataObject = cast(IDataObject)(transferData.pIDataObject);
151 dataObject.AddRef();
152 FORMATETC* formatetc = new FORMATETC();
153 formatetc.cfFormat = COM.CF_DIB;
154 formatetc.ptd = null;
155 formatetc.dwAspect = COM.DVASPECT_CONTENT;
156 formatetc.lindex = -1;
157 formatetc.tymed = COM.TYMED_HGLOBAL;
158 STGMEDIUM* stgmedium = new STGMEDIUM();
159 stgmedium.tymed = COM.TYMED_HGLOBAL;
160 transferData.result = dataObject.GetData(formatetc, stgmedium);
161
162 if (transferData.result !is COM.S_OK) return null;
163 HANDLE hMem = stgmedium.unionField;
164 dataObject.Release();
165 try {
166 auto ptr = OS.GlobalLock(hMem);
167 if (ptr is null) return null;
168 try {
169 BITMAPINFOHEADER bmiHeader;
170 OS.MoveMemory(&bmiHeader, ptr, BITMAPINFOHEADER.sizeof);
171 void* pBits;
172 auto memDib = OS.CreateDIBSection(null, cast(BITMAPINFO*)ptr, OS.DIB_RGB_COLORS, &pBits, null, 0);
173 if (memDib is null) DWT.error(DWT.ERROR_NO_HANDLES);
174 void* bits = ptr + bmiHeader.biSize;
175 if (bmiHeader.biBitCount <= 8) {
176 bits += (1 << bmiHeader.biBitCount) * 4;
177 } else if (bmiHeader.biCompression is OS.BI_BITFIELDS) {
178 bits += 12;
179 }
180 if (bmiHeader.biHeight < 0) {
181 OS.MoveMemory(pBits, bits, bmiHeader.biSizeImage);
182 } else {
183 DIBSECTION dib;
184 OS.GetObject(memDib, DIBSECTION.sizeof, &dib);
185 int biHeight = dib.biHeight;
186 int scanline = dib.biSizeImage / biHeight;
187 auto pDestBits = pBits;
188 auto pSourceBits = bits + scanline * (biHeight - 1);
189 for (int i = 0; i < biHeight; i++) {
190 OS.MoveMemory(pDestBits, pSourceBits, scanline);
191 pDestBits += scanline;
192 pSourceBits -= scanline;
193 }
194 }
195 Image image = Image.win32_new(null, DWT.BITMAP, memDib);
196 ImageData data = image.getImageData();
197 OS.DeleteObject(memDib);
198 image.dispose();
199 return data;
200 } finally {
201 OS.GlobalUnlock(hMem);
202 }
203 } finally {
204 OS.GlobalFree(hMem);
205 }
206 }
207
208 protected int[] getTypeIds(){
209 return [CF_DIBID];
210 }
211
212 protected String[] getTypeNames(){
213 return [CF_DIB];
214 }
215 bool checkImage(Object object) {
216 if (object is null || !(null !is cast(ImageData)object )) return false;
217 return true;
218 }
219
220 protected bool validate(Object object) {
221 return checkImage(object);
222 }
223 }
224