/
MetafileHeader.cs
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/
MetafileHeader.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Runtime.InteropServices;
using Gdip = System.Drawing.SafeNativeMethods.Gdip;
namespace System.Drawing.Imaging;
/// <summary>
/// Contains attributes of an associated <see cref='Metafile'/>.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public sealed class MetafileHeader
{
// determine which to use by nullity
internal MetafileHeaderWmf? wmf;
internal MetafileHeaderEmf? emf;
internal MetafileHeader()
{
}
/// <summary>
/// Gets the type of the associated <see cref='Metafile'/>.
/// </summary>
public MetafileType Type
{
get
{
return IsWmf() ? wmf!.type : emf!.type;
}
}
/// <summary>
/// Gets the size, in bytes, of the associated <see cref='Metafile'/>.
/// </summary>
public int MetafileSize
{
get
{
return IsWmf() ? wmf!.size : emf!.size;
}
}
/// <summary>
/// Gets the version number of the associated <see cref='Metafile'/>.
/// </summary>
public int Version
{
get
{
return IsWmf() ? wmf!.version : emf!.version;
}
}
/// <summary>
/// Gets the horizontal resolution, in dots-per-inch, of the associated <see cref='Metafile'/>.
/// </summary>
public float DpiX
{
get
{
return IsWmf() ? wmf!.dpiX : emf!.dpiX;
}
}
/// <summary>
/// Gets the vertical resolution, in dots-per-inch, of the associated <see cref='Metafile'/>.
/// </summary>
public float DpiY
{
get
{
return IsWmf() ? wmf!.dpiY : emf!.dpiY;
}
}
/// <summary>
/// Gets a <see cref='Rectangle'/> that bounds the associated <see cref='Metafile'/>.
/// </summary>
public Rectangle Bounds
{
get
{
return IsWmf() ?
new Rectangle(wmf!.X, wmf.Y, wmf.Width, wmf.Height) :
new Rectangle(emf!.X, emf.Y, emf.Width, emf.Height);
}
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Windows metafile format.
/// </summary>
public bool IsWmf()
{
if ((wmf == null) && (emf == null))
throw Gdip.StatusException(Gdip.InvalidParameter);
if ((wmf != null) &&
((wmf.type == MetafileType.Wmf) ||
(wmf.type == MetafileType.WmfPlaceable)))
return true;
else
return false;
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Windows Placeable metafile format.
/// </summary>
public bool IsWmfPlaceable()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((wmf != null) && (wmf.type == MetafileType.WmfPlaceable));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Windows enhanced metafile format.
/// </summary>
public bool IsEmf()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((emf != null) && (emf.type == MetafileType.Emf));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Windows enhanced
/// metafile format or the Windows enhanced metafile plus.
/// </summary>
public bool IsEmfOrEmfPlus()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((emf != null) && (emf.type >= MetafileType.Emf));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Windows enhanced
/// metafile plus format.
/// </summary>
public bool IsEmfPlus()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((emf != null) && (emf.type >= MetafileType.EmfPlusOnly));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is in the Dual enhanced metafile
/// format. This format supports both the enhanced and the enhanced plus format.
/// </summary>
public bool IsEmfPlusDual()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((emf != null) && (emf.type == MetafileType.EmfPlusDual));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> supports only the Windows
/// enhanced metafile plus format.
/// </summary>
public bool IsEmfPlusOnly()
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return ((emf != null) && (emf.type == MetafileType.EmfPlusOnly));
}
/// <summary>
/// Returns a value indicating whether the associated <see cref='Metafile'/> is device-dependent.
/// </summary>
public bool IsDisplay()
{
return IsEmfPlus() &&
(((unchecked((int)emf!.emfPlusFlags)) & ((int)EmfPlusFlags.Display)) != 0);
}
/// <summary>
/// Gets the WMF header file for the associated <see cref='Metafile'/>.
/// </summary>
public MetaHeader WmfHeader
{
get
{
if (wmf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return wmf.WmfHeader;
}
}
/// <summary>
/// Gets the size, in bytes, of the enhanced metafile plus header file.
/// </summary>
public int EmfPlusHeaderSize
{
get
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return IsWmf() ? wmf!.EmfPlusHeaderSize : emf!.EmfPlusHeaderSize;
}
}
/// <summary>
/// Gets the logical horizontal resolution, in dots-per-inch, of the associated <see cref='Metafile'/>.
/// </summary>
public int LogicalDpiX
{
get
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return IsWmf() ? wmf!.LogicalDpiX : emf!.LogicalDpiX;
}
}
/// <summary>
/// Gets the logical vertical resolution, in dots-per-inch, of the associated <see cref='Metafile'/>.
/// </summary>
public int LogicalDpiY
{
get
{
if (wmf == null && emf == null)
throw Gdip.StatusException(Gdip.InvalidParameter);
return IsWmf() ? wmf!.LogicalDpiY : emf!.LogicalDpiX;
}
}
}