public override NSImage GetImage()
{
var copy = new BitmapHandler();
copy.Create(size.Width, size.Height, PixelFormat.Format32bppRgb);
CopyTo(copy, new Rectangle(size));
return(copy.Control);
}
protected override void Dispose(bool disposing)
{
if (disposing && bmp != null)
{
bmp.Dispose();
bmp = null;
}
if (ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr);
ptr = IntPtr.Zero;
}
base.Dispose(disposing);
}
public void Create(int width, int height, int bitsPerPixel)
{
this.bitsPerPixel = bitsPerPixel;
bytesPerRow = width * bitsPerPixel / 8;
int colorCount = (int)Math.Pow(2, bitsPerPixel);
colors = new int[colorCount];
for (int i = 0; i < colorCount; i++)
{
colors[i] = unchecked ((int)0xffffffff);
}
size = new Size(width, height);
ptr = Marshal.AllocHGlobal(height * bytesPerRow);
//Control = new byte[height * bytesPerRow];
bmp = new BitmapHandler();
bmp.Create(size.Width, size.Height, PixelFormat.Format32bppRgb);
}
void CopyTo(BitmapHandler bmp, Rectangle source)
{
if (source.Top < 0 || source.Left < 0 || source.Right > size.Width || source.Bottom > size.Height)
{
throw new Exception("Source rectangle exceeds image size");
}
// we have to draw to a temporary bitmap pixel by pixel
var bd = bmp.Lock();
unsafe
{
var dest = (byte *)bd.Data;
var src = (byte *)ptr;
var scany = size.Width;
dest += source.Top * bd.ScanWidth;
dest += source.Left * bd.BytesPerPixel;
src += source.Top * scany;
src += source.Left;
int bottom = source.Bottom;
int right = source.Right;
int left = source.Left;
scany = scany - (right - left);
for (int y = source.Top; y < bottom; y++)
{
var destrow = (int *)dest;
for (int x = left; x < right; x++)
{
*destrow = colors[*src];
destrow++;
src++;
}
dest += bd.ScanWidth;
src += scany;
}
}
bmp.Unlock(bd);
}
