/// <summary>
/// Renders the <see cref="PresentationImage"/> to a provided offscreen <see cref="Bitmap"/>.
/// </summary>
/// <param name="bmp">The offscreen bitmap to render to.</param>
/// <returns></returns>
/// <remarks>
/// This method can be used anywhere an offscreen bitmap is required, such as
/// paper/DICOM printing, thumbnail generation, creation of new DICOM images, etc.
/// </remarks>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="bmp"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown if <paramref name="bmp"/> has invalid dimensions.</exception>
/// <exception cref="RenderingException">Thrown if any <see cref="Exception"/> is encountered while rendering the image.</exception>
public virtual void DrawToBitmap(Bitmap bmp)
{
Platform.CheckForNullReference(bmp, "bmp");
Platform.CheckPositive(bmp.Width, "bmp.Width");
Platform.CheckPositive(bmp.Height, "bmp.Height");
var graphics = System.Drawing.Graphics.FromImage(bmp);
var contextId = graphics.GetHdc();
try
{
using (var surface = ImageRenderer.CreateRenderingSurface(IntPtr.Zero, bmp.Width, bmp.Height, RenderingSurfaceType.Offscreen))
{
surface.ContextID = contextId;
surface.ClipRectangle = new Rectangle(0, 0, bmp.Width, bmp.Height);
var drawArgs = new DrawArgs(surface, null, DrawMode.Render)
{
Tag = bmp
};
DrawNoEvents(drawArgs);
drawArgs = new DrawArgs(surface, null, DrawMode.Refresh)
{
Tag = bmp
};
DrawNoEvents(drawArgs);
}
}
finally
{
graphics.ReleaseHdc(contextId);
graphics.Dispose();
}
}