CairoBridge.cs

using System;
namespace Kebrum.Widgets
{
	
	public class CairoBridge:IDisposable
	{
		
		private Cairo.ImageSurface m_Surface;
		private System.Drawing.Graphics m_Graphics;
		private System.Drawing.Bitmap m_Bitmap;
		private IntPtr m_Data;
		
		public Cairo.ImageSurface Surface
		{
			get
			{
				return m_Surface;
			}
		}
		
		public System.Drawing.Graphics Graphics
		{
			get
			{
				return m_Graphics;
			}
		}
		
		public System.Drawing.Bitmap Bitmap
		{
			get
			{
				return m_Bitmap;
			}
		}
		
		public CairoBridge (int Width, int Height)
		{
			int Stride = Width * 4;
			m_Data = System.Runtime.InteropServices.Marshal.AllocHGlobal (Width * Height * 4);
		
			m_Bitmap = new System.Drawing.Bitmap (Width, Height, Stride, System.Drawing.Imaging.PixelFormat.Format32bppPArgb, m_Data);
			m_Graphics = System.Drawing.Graphics.FromImage (m_Bitmap);
			m_Surface = new Cairo.ImageSurface (m_Data, Cairo.Format.Argb32, Width, Height, Stride);
		}
		
		
		public void Dispose ()
		{
			if (m_Data == IntPtr.Zero)
				return;
			m_Graphics.Dispose ();
			m_Graphics = null;
			m_Bitmap.Dispose ();
			m_Bitmap = null;
			((IDisposable)m_Surface).Dispose ();
			m_Surface = null;
			System.Runtime.InteropServices.Marshal.FreeHGlobal (m_Data);
			m_Data = IntPtr.Zero;
		}
		~CairoBridge ()
		{
			Dispose ();
		}
		
		private static CairoBridge m_Shared=null;
		
		
		public void Clear (int Width, int Height)
		{
			int Stride = m_Bitmap.Width;
			unsafe
			{
				uint* curscan = (uint*)m_Data.ToPointer ();
				
				for (uint y = 0; y < Height; y++)
				{
					uint* cur = curscan + Stride*y;
					for (uint x = 0; x < Width; x++)
					{
						*cur = 0;
						cur++;
					}
				}
			}
		}
	}
}