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