public void Resize(Bitmap src, Bitmap dst, object options = null)
{
var scaleX = (double)dst.Width / src.Width;
var scaleY = (double)dst.Height / src.Height;
var scale = Math.Max(scaleX, scaleY);
if (Math.Abs(scaleX - 2) < 0.0001 && Math.Abs(scaleY - 2) < 0.0001)
{
doubler.Double(src, dst);
return;
}
if (Math.Abs(scaleX - 4) < 0.0001 && Math.Abs(scaleY - 4) < 0.0001)
{
Four(src, dst);
return;
}
if (scale > 2)
{
var temp = new byte[src.Width * src.Height * src.Channel * src.Depth << 1];
var handle = GCHandle.Alloc(temp, GCHandleType.Pinned);
var tempBitmap = new Bitmap(handle.AddrOfPinnedObject(),
4 * src.Width * src.Channel * (src.Depth >> 3),
4 * src.Width, 4 * src.Height, src.Depth, src.Channel);
Four(src, tempBitmap);
resizer.Resize(tempBitmap, dst);
handle.Free();
return;
}
if (scale > 1)
{
var temp = new byte[src.Width * src.Height * src.Channel * src.Depth >> 1];
var handle = GCHandle.Alloc(temp, GCHandleType.Pinned);
var tempBitmap = new Bitmap(handle.AddrOfPinnedObject(),
2 * src.Width * src.Channel * (src.Depth >> 3),
2 * src.Width, 2 * src.Height, src.Depth, src.Channel);
doubler.Double(src, tempBitmap);
resizer.Resize(tempBitmap, dst);
handle.Free();
return;
}
resizer.Resize(src, dst);
}
public BitmapSource GetPartial(IResizer resizer, Int32Rect pos, double scale)
{
var src = source.GetBitmap(pos);
var result = Misc.AllocWriteableBitmap(
(int)(pos.Width * scale), (int)(pos.Height * scale), src.Depth, src.Channel);
result.Lock();
var dst = Misc.BitmapOfWritableBitmap(result);
resizer.Resize(src, dst);
result.AddDirtyRect(new Int32Rect(0, 0, result.PixelWidth, result.PixelHeight));
result.Unlock();
result.Freeze();
return(result);
}
public void Resize(Bitmap src, Bitmap dst, object options = null)
{
resizer.Resize(src, dst, option);
}
