internal Image(Stream stream, DirectCanvasFactory directCanvasFactory)
{
m_directCanvasFactory = directCanvasFactory;
var factory = m_directCanvasFactory.WicImagingFactory;
var nativeStream = new NativeStream(stream);
var vendorGuid = Guid.Empty;
IWICBitmapDecoder decoder;
int hr = factory.CreateDecoderFromStream(nativeStream,
ref vendorGuid,
WICDecodeOptions.WICDecodeMetadataCacheOnLoad,
out decoder);
if (hr != 0)
throw new Exception(string.Format("Could not create the decoder from stream {0}", hr));
Initialize(decoder);
}
/// <summary>
/// Saves an image to a stream
/// </summary>
/// <param name="stream">The stream to write to</param>
/// <param name="format">The image format to use</param>
public void Save(Stream stream, ImageFormat format)
{
/* Get the wic factory from our direct canvas factory */
var factory = m_directCanvasFactory.WicImagingFactory;
/* The WIC encoder interface */
IWICBitmapEncoder encoder = null;
IWICBitmapFrameEncode frame = null;
Exception exception = null;
/* The area of the image we are going to encode */
var rect = new WICRect() { X = 0, Y = 0, Width = Width, Height = Height };
/* We don't prefer any vendor */
Guid vendor = Guid.Empty;
/* Get the WIC Guid for the format we want to use */
Guid wicContainerFormat = ImageFormatToWicContainerFormat(format);
/* Create our encoder */
int hr = factory.CreateEncoder(ref wicContainerFormat,
ref vendor,
out encoder);
if (hr != 0)
{
exception = new Exception("Could not create the encoder");
goto cleanup;
}
/* Here we wrap our .NET stream with a COM IStream */
var nativeStream = new NativeStream(stream);
/* This intializes the encoder */
hr = encoder.Initialize(nativeStream, WICBitmapEncoderCacheOption.WICBitmapEncoderNoCache);
if(hr != 0)
{
exception = new Exception("Could not initialize the encoder");
goto cleanup;
}
IntPtr options = IntPtr.Zero;
/* Creates a new frame to be encoded */
hr = encoder.CreateNewFrame(out frame, ref options);
if (hr != 0)
{
exception = new Exception("Could not create a new frame for the encoder");
goto cleanup;
}
/* This intializes with the defaults */
hr = frame.Initialize(IntPtr.Zero);
if (hr != 0)
{
exception = new Exception("Could not initialize the encoded frame");
goto cleanup;
}
/* Sets the size of the frame */
hr = frame.SetSize(Width, Height);
if (hr != 0)
{
exception = new Exception("Could not set the size of the encode frame");
goto cleanup;
}
hr = frame.SetPixelFormat(ref WICFormats.WICPixelFormatDontCare);
/* Write our WIC bitmap source */
hr = frame.WriteSource(m_internalBitmap, ref rect);
if (hr != 0)
{
exception = new Exception("Could not write the bitmap source to the frame");
goto cleanup;
}
/* Commits all our changes to the frame */
hr = frame.Commit();
if (hr != 0)
{
exception = new Exception("Could not commit the frame");
goto cleanup;
}
/* Actually does all the encoding */
hr = encoder.Commit();
if (hr != 0)
{
exception = new Exception("Could not commit the encoder");
goto cleanup;
}
cleanup:
if(frame != null)
Marshal.ReleaseComObject(frame);
if(encoder != null)
Marshal.ReleaseComObject(encoder);
if (exception != null)
throw exception;
}