source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorRenderingGdi/Gdi/GdiImageRendering.cs @ 13620

using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

using SharpVectors.Net;
using SharpVectors.Dom.Svg;

namespace SharpVectors.Renderers.Gdi
{
  /// <summary>
  /// Summary description for SvgImageGraphicsNode.
  /// </summary>
    public sealed class GdiImageRendering : GdiRendering
    {
        #region Private Fields

        private GdiGraphicsRenderer _embeddedRenderer;

        #endregion

        #region Constructors and Destructor

        public GdiImageRendering(SvgElement element) 
            : base(element)
    {
    }

        #endregion

        #region Public Methods

        public override void Render(GdiGraphicsRenderer renderer)
    {
            GdiGraphicsWrapper graphics = renderer.GraphicsWrapper;
      SvgImageElement iElement = (SvgImageElement) element;

      ImageAttributes imageAttributes = new ImageAttributes();

      string sOpacity = iElement.GetPropertyValue("opacity");
      if (sOpacity != null && sOpacity.Length > 0)
      {
        double opacity = SvgNumber.ParseNumber(sOpacity);
        ColorMatrix myColorMatrix = new ColorMatrix();
        myColorMatrix.Matrix00 = 1.00f; // Red
        myColorMatrix.Matrix11 = 1.00f; // Green
        myColorMatrix.Matrix22 = 1.00f; // Blue
        myColorMatrix.Matrix33 = (float)opacity; // alpha
        myColorMatrix.Matrix44 = 1.00f; // w

        imageAttributes.SetColorMatrix(myColorMatrix,
                    ColorMatrixFlag.Default,ColorAdjustType.Bitmap);
      }

            float width  = (float)iElement.Width.AnimVal.Value;
      float height = (float)iElement.Height.AnimVal.Value;

            Rectangle destRect = new Rectangle(Convert.ToInt32(iElement.X.AnimVal.Value),
                Convert.ToInt32(iElement.Y.AnimVal.Value), 
                Convert.ToInt32(width), Convert.ToInt32(height));

      Image image = null;
      if (iElement.IsSvgImage)
      {
        SvgWindow wnd = GetSvgWindow();
                _embeddedRenderer.BackColor = Color.Empty;
                _embeddedRenderer.Render(wnd.Document);

                image = _embeddedRenderer.RasterImage;
      }
      else
      {
        image = GetBitmap(iElement);
      }

      if (image != null)
      {
        graphics.DrawImage(this, image, destRect, 0f, 0f,
                    image.Width, image.Height, GraphicsUnit.Pixel, imageAttributes);

                image.Dispose();
                image = null;
      }

            if (_embeddedRenderer != null)
            {
                _embeddedRenderer.Dispose();
                _embeddedRenderer = null;
            }

            if (imageAttributes != null)
            {
                imageAttributes.Dispose();
                imageAttributes = null;
            }
    }

        #endregion

        #region Private Methods

        private SvgWindow GetSvgWindow()
    {
            if (_embeddedRenderer == null)
            {
                _embeddedRenderer = new GdiGraphicsRenderer();
            }

      SvgImageElement iElm = this.Element as SvgImageElement;
      SvgWindow wnd = iElm.SvgWindow;
            wnd.Renderer  = _embeddedRenderer;

            _embeddedRenderer.Window = wnd;

      return wnd;
    }

        private Image GetBitmap(SvgImageElement element)
        {
            if (!element.IsSvgImage)
            {
                if (!element.Href.AnimVal.StartsWith("data:"))
                {
                    SvgUriReference svgUri = element.UriReference;
                    Uri imageUri = new Uri(svgUri.AbsoluteUri);
                    if (imageUri.IsFile && File.Exists(imageUri.LocalPath))
                    {
                        return Bitmap.FromFile(imageUri.LocalPath);
                    }

                    Stream stream = svgUri.ReferencedResource.GetResponseStream();
                    return Bitmap.FromStream(stream);
                }
                else
                {
                    string sURI    = element.Href.AnimVal;
                    int nColon     = sURI.IndexOf(":");
                    int nSemiColon = sURI.IndexOf(";");
                    int nComma     = sURI.IndexOf(",");

                    string sMimeType = sURI.Substring(nColon + 1, nSemiColon - nColon - 1);

                    string sContent  = sURI.Substring(nComma + 1);
                    byte[] bResult   = Convert.FromBase64CharArray(sContent.ToCharArray(), 
                        0, sContent.Length);

                    MemoryStream ms = new MemoryStream(bResult);

                    return Bitmap.FromStream(ms);
                }
            }
            else
            {
                return null;
            }
        }

        #endregion
  }
}