public static extern uint WriteMemory(byte[] buffer, uint size, uint count, FIMEMORY stream);
public static extern void CloseMemory(FIMEMORY stream);
public static extern bool AcquireMemory(FIMEMORY stream, ref IntPtr data, ref uint size_in_bytes);
public static extern int TellMemory(FIMEMORY stream);
public static extern bool SeekMemory(FIMEMORY stream, int offset, System.IO.SeekOrigin origin);
public static extern bool SaveToMemory(FREE_IMAGE_FORMAT fif, FIBITMAP dib, FIMEMORY stream, FREE_IMAGE_SAVE_FLAGS flags);
public static extern FIMULTIBITMAP LoadMultiBitmapFromMemory(FREE_IMAGE_FORMAT fif, FIMEMORY stream, FREE_IMAGE_LOAD_FLAGS flags);
public static extern FREE_IMAGE_FORMAT GetFileTypeFromMemory(FIMEMORY stream, int size);
/// <summary>
/// Loads a FreeImage multi-paged bitmap from a stream and returns the
/// FreeImage memory stream used as temporary buffer.
/// The bitmap can not be modified by calling
/// <see cref="FreeImage.AppendPage(FIMULTIBITMAP,FIBITMAP)"/>,
/// <see cref="FreeImage.InsertPage(FIMULTIBITMAP,Int32,FIBITMAP)"/>,
/// <see cref="FreeImage.MovePage(FIMULTIBITMAP,Int32,Int32)"/> or
/// <see cref="FreeImage.DeletePage(FIMULTIBITMAP,Int32)"/>.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="format">Format of the image.</param>
/// <param name="flags">Flags to enable or disable plugin-features.</param>
/// <param name="memory">The temporary memory buffer used to load the bitmap.</param>
/// <returns>Handle to a FreeImage multi-paged bitmap.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="stream"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="stream"/> can not read.</exception>
public static FIMULTIBITMAP LoadMultiBitmapFromStream(
Stream stream,
FREE_IMAGE_FORMAT format,
FREE_IMAGE_LOAD_FLAGS flags,
out FIMEMORY memory)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanRead)
{
throw new ArgumentException("stream");
}
const int blockSize = 1024;
int bytesRead;
byte[] buffer = new byte[blockSize];
stream = stream.CanSeek ? stream : new StreamWrapper(stream, true);
memory = OpenMemory(IntPtr.Zero, 0);
do
{
bytesRead = stream.Read(buffer, 0, blockSize);
WriteMemory(buffer, (uint)blockSize, (uint)1, memory);
}
while (bytesRead == blockSize);
return LoadMultiBitmapFromMemory(format, memory, flags);
}
