public unsafe static Bitmap BytesToBitmap(this IRasterReader reader, byte[] buffer, int width, int height, int byteCountPerPixel)
{
if (buffer.Length != (width * height * byteCountPerPixel))
{
throw new ArgumentOutOfRangeException("Buffer的大小与指定的Widht、Height不匹配!");
}
if (byteCountPerPixel != 3 && byteCountPerPixel != 4)
{
throw new NotSupportedException("不支持的像素格式\"" + byteCountPerPixel.ToString() + "\"!");
}
PixelFormat pf = GetPixelFormat(byteCountPerPixel);
Bitmap bitmap = new Bitmap(width, height, pf);
BytesToBitmap(reader, buffer, width, height, byteCountPerPixel, ref bitmap);
return(bitmap);
}
public unsafe static bool BytesToBitmap(this IRasterReader reader, byte[] buffer, int width, int height, int byteCountPerPixel, ref Bitmap bitmap)
{
if (buffer.Length != (width * height * byteCountPerPixel))
{
throw new ArgumentOutOfRangeException("Buffer的大小与指定的Widht、Height不匹配!");
}
if (byteCountPerPixel != 3 && byteCountPerPixel != 4)
{
throw new NotSupportedException("不支持的像素格式\"" + byteCountPerPixel.ToString() + "\"!");
}
PixelFormat pf = GetPixelFormat(byteCountPerPixel);
BitmapData bdata = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, pf);
IntPtr ptr = bdata.Scan0;
byte * beginPt = (byte *)ptr;
byte * pt = (byte *)ptr;
for (int row = 0; row < bitmap.Height; row++)
{
pt = beginPt + row * bdata.Stride;
int rowAddress = row * bitmap.Width * byteCountPerPixel;
for (int col = 0; col < bitmap.Width; col++, pt++)
{
int colAddress = rowAddress + col * byteCountPerPixel;
if (byteCountPerPixel == 3)
{
*pt = buffer[colAddress + 2];
*(++pt) = buffer[colAddress + 1];
*(++pt) = buffer[colAddress];
}
else if (byteCountPerPixel == 4)
{
*pt = buffer[colAddress + 3];
*(++pt) = buffer[colAddress + 2];
*(++pt) = buffer[colAddress + 1];
*(++pt) = buffer[colAddress];
}
}
}
bitmap.UnlockBits(bdata);
return(true);
}
public void Dispose()
{
_reader.Dispose();
_reader = null;
}
public RasterDataSource(string url)
{
_url = url;
_reader = RasterReaderFactory.GetRasterReader(url);
}
