/// <summary>
/// Renders a bitmap to a DIB bitmap in HGLOBAL format. It is neccessary that the provided bitmap has a pixel format of PixelFormat.Format24bppRgb.
/// </summary>
/// <param name="bitmap">The provided bitmap. Must have PixelFormat.Format24bppRgb.</param>
/// <returns>HGLOBAL pointer to the DIB bitmap.</returns>
public static IntPtr RenderDIBBitmapToHGLOBAL(Bitmap bitmap)
{
if (null == bitmap)
{
throw new ArgumentNullException("bitmap");
}
if (bitmap.PixelFormat != PixelFormat.Format24bppRgb)
{
throw new ArgumentException(string.Format("bitmap must have PixelFormat.Format24bppRgb, but it has {0}", bitmap.PixelFormat));
}
var bmpStream = new System.IO.MemoryStream();
// ImageFormat.MemoryBmp work (will save to PNG!). Therefore use BMP and strip header.
bitmap.Save(bmpStream, ImageFormat.Bmp);
byte[] bmpBytes = bmpStream.ToArray();
int offset = Marshal.SizeOf(typeof(BITMAPFILEHEADER));
IntPtr hdib = Kernel32Func.GlobalAlloc(GlobalAllocFlags.GHND, (int)(bmpStream.Length - offset));
if (!(hdib != IntPtr.Zero))
{
throw new InvalidOperationException("GlobalAlloc operation was not successful");
}
IntPtr buf = Kernel32Func.GlobalLock(hdib);
Marshal.Copy(bmpBytes, offset, buf, (int)bmpStream.Length - offset);
Kernel32Func.GlobalUnlock(hdib);
return(hdib);
}
public static IntPtr RenderLinkedObjectDescriptor(TYMED tymed)
{
ComDebug.ReportInfo("GraphDocumentDataObject.RenderLinkedObjectDescriptor");
// Brockschmidt, Inside Ole 2nd ed. page 991
if (!(tymed == TYMED.TYMED_HGLOBAL))
{
throw new ArgumentException(nameof(tymed) + " is not TYMED_HGLOBAL");
}
// Fill in the basic information.
var od = new OBJECTDESCRIPTOR
{
// According to the documentation this is used just to find an icon.
clsid = typeof(GraphDocumentLinkedComObject).GUID,
dwDrawAspect = DVASPECT.DVASPECT_CONTENT,
sizelcx = 0, // zero in imitation of Word/Excel, but could be box.Extent.cx;
sizelcy = 0, // zero in imitation of Word/Excel, but could be box.Extent.cy;
pointlx = 0,
pointly = 0
};
od.dwStatus = MiscStatus((int)od.dwDrawAspect);
// Descriptive strings to tack on after the struct.
string name = GraphDocumentLinkedComObject.USER_TYPE;
int name_size = (name.Length + 1) * sizeof(char);
string source = "Altaxo";
int source_size = (source.Length + 1) * sizeof(char);
int od_size = Marshal.SizeOf(typeof(OBJECTDESCRIPTOR));
od.dwFullUserTypeName = od_size;
od.dwSrcOfCopy = od_size + name_size;
int full_size = od_size + name_size + source_size;
od.cbSize = full_size;
// To avoid 'unsafe', we will arrange the strings in a byte array.
byte[] strings = new byte[full_size];
Encoding unicode = Encoding.Unicode;
Array.Copy(unicode.GetBytes(name), 0, strings, od.dwFullUserTypeName, name.Length * sizeof(char));
Array.Copy(unicode.GetBytes(source), 0, strings, od.dwSrcOfCopy, source.Length * sizeof(char));
// Combine the strings and the struct into a single block of mem.
IntPtr hod = Kernel32Func.GlobalAlloc(GlobalAllocFlags.GHND, full_size);
if (!(hod != IntPtr.Zero))
{
throw new InvalidOperationException("GlobalAlloc operation was not successful");
}
IntPtr buf = Kernel32Func.GlobalLock(hod);
Marshal.Copy(strings, 0, buf, full_size);
Marshal.StructureToPtr(od, buf, false);
Kernel32Func.GlobalUnlock(hod);
return(hod);
}
/// <summary>
/// Renders a bitmap to a DIBV5 bitmap in HGLOBAL format. It is neccessary that the provided bitmap has a pixel format of PixelFormat.Format32bppRgb.
/// </summary>
/// <param name="bm">The provided bitmap. Must have PixelFormat.Format24bppRgb.</param>
/// <returns>HGLOBAL pointer to the DIB bitmap.</returns>
/// <remarks>
/// See <see href="https://groups.google.com/forum/#!msg/microsoft.public.dotnet.framework.drawing/0sSPCrzf8yE/WNEIU324YtwJ"/> for the original source code and the discussion./>
/// </remarks>
public static IntPtr RenderDIBV5BitmapToHGLOBAL(Bitmap bm)
{
BitmapData bmData = bm.LockBits(new Rectangle(0, 0, bm.Width, bm.Height), ImageLockMode.ReadOnly, bm.PixelFormat);
int bufferLen = (Marshal.SizeOf(typeof(BITMAPV5HEADER)) + bmData.Height * bmData.Stride);
IntPtr hMem = Kernel32Func.GlobalAlloc(GlobalAllocFlags.GHND, bufferLen);
IntPtr packedDIBV5 = Kernel32Func.GlobalLock(hMem);
var bmi = (BITMAPV5HEADER)Marshal.PtrToStructure(packedDIBV5, typeof(BITMAPV5HEADER));
bmi.bV5Size = (uint)Marshal.SizeOf(typeof(BITMAPV5HEADER));
bmi.bV5Width = bmData.Width;
bmi.bV5Height = -bmData.Height; // Top-down bitmap requires negative height
bmi.bV5BitCount = 32;
bmi.bV5Planes = 1;
bmi.bV5Compression = (uint)BiCompression.BI_RGB;
bmi.bV5XPelsPerMeter = (int)(bm.HorizontalResolution * (10000 / 254.0));
bmi.bV5YPelsPerMeter = (int)(bm.VerticalResolution * (10000 / 254.0));
bmi.bV5ClrUsed = 0;
bmi.bV5ClrImportant = 0;
bmi.bV5BlueMask = 0x000000FF;
bmi.bV5GreenMask = 0x0000FF00;
bmi.bV5RedMask = 0x00FF0000;
bmi.bV5AlphaMask = 0xFF000000;
bmi.bV5CSType = (uint)LcsCsType.LCS_WINDOWS_COLOR_SPACE;
bmi.bV5GammaBlue = 0;
bmi.bV5GammaGreen = 0;
bmi.bV5GammaRed = 0;
bmi.bV5ProfileData = 0;
bmi.bV5ProfileSize = 0;
bmi.bV5Reserved = 0;
bmi.bV5Intent = (uint)LcsIntent.LCS_GM_IMAGES;
bmi.bV5SizeImage = (uint)(bmData.Height * bmData.Stride);
bmi.bV5Endpoints.ciexyzBlue.ciexyzX = bmi.bV5Endpoints.ciexyzBlue.ciexyzY = bmi.bV5Endpoints.ciexyzBlue.ciexyzZ = 0;
bmi.bV5Endpoints.ciexyzGreen.ciexyzX = bmi.bV5Endpoints.ciexyzGreen.ciexyzY = bmi.bV5Endpoints.ciexyzGreen.ciexyzZ = 0;
bmi.bV5Endpoints.ciexyzRed.ciexyzX = bmi.bV5Endpoints.ciexyzRed.ciexyzY = bmi.bV5Endpoints.ciexyzRed.ciexyzZ = 0;
Marshal.StructureToPtr(bmi, packedDIBV5, false);
int offsetBits = (int)bmi.bV5Size;
var bits = IntPtr.Add(packedDIBV5, offsetBits);
Kernel32Func.CopyMemory(bits, bmData.Scan0, (uint)(bmData.Height * bmData.Stride));
bm.UnlockBits(bmData);
Kernel32Func.GlobalUnlock(hMem);
return(hMem);
}
/// <summary>
/// Converts an enhanced metafile to a windows metafile picture (CF_MFPICT). Please note that the provided enhanced metafile should neither contain
/// transparancies nor splines. Thus it is best if the provided enhanced metafile contains only an embedded bitmap in 24bppRGB format.
/// </summary>
/// <param name="hEmf">The handle to the enhanced metafile.</param>
/// <param name="docSizeX">The document size x in points.</param>
/// <param name="docSizeY">The document size y in points.</param>
/// <returns>Handle to a windows meta file picture (CF_MFPICT).</returns>
public static IntPtr ConvertEnhancedMetafileToWindowsMetafilePict(IntPtr hEmf, double docSizeX, double docSizeY)
{
byte[] buffer = ConvertEnhancedMetafileToWindowsMetafileBytes(hEmf);
// Get a handle to the converted metafile.
IntPtr hmf = Gdi32Func.SetMetaFileBitsEx((uint)buffer.Length, buffer);
// Convert the Metafile to a METAFILEPICT.
IntPtr hMem = Kernel32Func.GlobalAlloc(GlobalAllocFlags.GHND, Marshal.SizeOf(typeof(METAFILEPICT)));
var mfp = new METAFILEPICT()
{
mm = MappingMode.MM_ANISOTROPIC,
xExt = PointToHimetric(docSizeX),
yExt = PointToHimetric(docSizeY),
hMF = hmf
};
Marshal.StructureToPtr(mfp, Kernel32Func.GlobalLock(hMem), false);
Kernel32Func.GlobalUnlock(hMem);
return(hMem);
}
