public unsafe Bitmap(Stream stream, bool useIcm)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream));
IntPtr bitmap = IntPtr.Zero;
if (useIcm)
{
Gdip.CheckStatus(Gdip.GdipCreateBitmapFromStreamICM(streamWrapper.Ptr, &bitmap));
}
else
{
Gdip.CheckStatus(Gdip.GdipCreateBitmapFromStream(streamWrapper.Ptr, &bitmap));
}
ValidateImage(bitmap);
SetNativeImage(bitmap);
EnsureSave(this, null, stream);
}
/// <summary>
/// Saves this <see cref='Image'/> to the specified stream in the specified format.
/// </summary>
public void Save(Stream stream, ImageCodecInfo encoder, EncoderParameters?encoderParams)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (encoder == null)
{
throw new ArgumentNullException(nameof(encoder));
}
IntPtr encoderParamsMemory = IntPtr.Zero;
if (encoderParams != null)
{
_rawData = null;
encoderParamsMemory = encoderParams.ConvertToMemory();
}
try
{
Guid g = encoder.Clsid;
bool saved = false;
if (_rawData != null)
{
ImageCodecInfo?rawEncoder = RawFormat.FindEncoder();
if (rawEncoder != null && rawEncoder.Clsid == g)
{
stream.Write(_rawData, 0, _rawData.Length);
saved = true;
}
}
if (!saved)
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(new GPStream(stream, makeSeekable: false));
unsafe
{
Gdip.CheckStatus(Gdip.GdipSaveImageToStream(
new HandleRef(this, nativeImage),
streamWrapper.Ptr,
&g,
new HandleRef(encoderParams, encoderParamsMemory)));
}
}
}
finally
{
if (encoderParamsMemory != IntPtr.Zero)
{
Marshal.FreeHGlobal(encoderParamsMemory);
}
}
}
private static unsafe IntPtr LoadGdipImageFromStream(GPStream stream, bool useEmbeddedColorManagement)
{
using DrawingCom.IStreamWrapper streamWrapper = DrawingCom.GetComWrapper(stream);
IntPtr image = IntPtr.Zero;
if (useEmbeddedColorManagement)
{
Gdip.CheckStatus(Gdip.GdipLoadImageFromStreamICM(streamWrapper.Ptr, &image));
}
else
{
Gdip.CheckStatus(Gdip.GdipLoadImageFromStream(streamWrapper.Ptr, &image));
}
return(image);
}