public void ConfigureMapView()
{
MapView = new WebMapView(this);
MapRequestConfig.ConfigureMapView(MapView);
}
public MapPresenter(Map map, WebMapView view)
: base(map, view)
{
}
protected override Stream RenderStreamInternal(WebMapView map, out string mimeType)
{
Stream stream = base.RenderStreamInternal(map, out mimeType);
if (MapView.BackgroundColor == StyleColor.Transparent
&& TransparentColorIndex.HasValue
&& ImageCodec.Clsid == FindCodec("image/gif").Clsid)
{
Color trans = ViewConverter.Convert(MapView.BackgroundColor);
using (Bitmap bmpSrc = new Bitmap(stream))
{
using (Bitmap bmpTrgt = new Bitmap(bmpSrc.Width, bmpSrc.Height, PixelFormat.Format8bppIndexed))
{
ColorPalette cp = bmpSrc.Palette;
ColorPalette ncp = bmpTrgt.Palette;
int n = 0;
foreach (Color c in cp.Entries)
ncp.Entries[n++] = Color.FromArgb(255, c);
ncp.Entries[TransparentColorIndex.Value] = Color.FromArgb(0, ncp.Entries[TransparentColorIndex.Value]);
bmpTrgt.Palette = ncp;
BitmapData src =
bmpSrc.LockBits(new Rectangle(0, 0, bmpSrc.Width, bmpSrc.Height),
ImageLockMode.ReadOnly, bmpSrc.PixelFormat);
BitmapData dst =
bmpTrgt.LockBits(new Rectangle(0, 0, bmpTrgt.Width, bmpTrgt.Height), ImageLockMode.WriteOnly,
bmpTrgt.PixelFormat);
unsafe
{
for (int y = 0; y < bmpSrc.Height; y++)
for (int x = 0; x < bmpSrc.Width; x++)
{
((byte*)dst.Scan0.ToPointer())[(dst.Stride * y) + x] =
((byte*)src.Scan0.ToPointer())[(src.Stride * y) + x];
}
}
bmpSrc.UnlockBits(src);
bmpTrgt.UnlockBits(dst);
MemoryStream ms = new MemoryStream();
bmpTrgt.Save(ms, ImageFormat.Gif);
return ms;
}
}
}
return stream;
}
