/// <summary>
/// Writes to an unmanaged stream.
/// </summary>
protected unsafe int Write(FreeImageIO io, fi_handle handle, uint size, uint count, ref byte[] buffer)
{
fixed(byte *ptr = buffer)
{
return((int)io.writeProc(new IntPtr(ptr), size, count, handle));
}
}
/// <summary>
/// Reads the requested data from the stream and writes it to the given address.
/// </summary>
static unsafe uint streamRead(IntPtr buffer, uint size, uint count, fi_handle handle)
{
Stream stream = handle.GetObject() as Stream;
if ((stream == null) || (!stream.CanRead))
{
return 0;
}
uint readCount = 0;
byte* ptr = (byte*)buffer;
byte[] bufferTemp = new byte[size];
int read;
while (readCount < count)
{
read = stream.Read(bufferTemp, 0, (int)size);
if (read != (int)size)
{
stream.Seek(-read, SeekOrigin.Current);
break;
}
for (int i = 0; i < read; i++, ptr++)
{
*ptr = bufferTemp[i];
}
readCount++;
}
return (uint)readCount;
}
// Saving function
protected override bool SaveProc(ref FreeImageIO io, FIBITMAP dib, fi_handle handle, int page, int flags, IntPtr data)
{
SerialDib sdib;
uint size = FreeImage.GetDIBSize(dib);
// Store all data needed to recreate the bitmap
sdib.width = FreeImage.GetWidth(dib);
sdib.height = FreeImage.GetHeight(dib);
sdib.pitch = (int)FreeImage.GetPitch(dib);
sdib.bpp = FreeImage.GetBPP(dib);
sdib.red_mask = FreeImage.GetRedMask(dib);
sdib.green_mask = FreeImage.GetGreenMask(dib);
sdib.blue_mask = FreeImage.GetBlueMask(dib);
sdib.data = new byte[size];
// Copy the bitmaps data into the structures byte-array
// The marshaller is used to create an IntPtr for using
// 'ConvertToRawBits'.
FreeImage.ConvertToRawBits(Marshal.UnsafeAddrOfPinnedArrayElement(sdib.data, 0),
dib, sdib.pitch, sdib.bpp,
sdib.red_mask, sdib.green_mask, sdib.blue_mask,
false);
// Use the healper function to write the header to the destination
if (Write(io, handle, (uint)header.Length, 1, ref header) != 1)
{
return(false);
}
// Create a serializer
BinaryFormatter formatter = new BinaryFormatter();
// Create a temporary stream
MemoryStream stream = new MemoryStream();
// Create a compression stream
GZipStream zipStream = new GZipStream(stream, CompressionMode.Compress);
// Serialize the structure into the compression stream
formatter.Serialize(zipStream, sdib);
// Unload the compression stream
zipStream.Dispose();
// Get the result data
byte[] buffer = stream.GetBuffer();
// Use the healper function 'Write' to write the data to the destination
if (Write(io, handle, 1, (uint)buffer.Length, ref buffer) != buffer.Length)
{
// Unload the temporary stream
stream.Dispose();
return(false);
}
// Unload the temporary stream
stream.Dispose();
return(true);
}
// Loading function
protected override FIBITMAP LoadProc(ref FreeImageIO io, fi_handle handle, int page, int flags, IntPtr data)
{
// Check if the data has the correct format
if (!ValidateProc(ref io, handle))
{
// Create a free-image message
FreeImage.OutputMessageProc(format, "Invalid format.");
// return 0 (operation failed)
return(FIBITMAP.Zero);
}
SerialDib sdib;
int read = 0;
System.IO.MemoryStream stream = new System.IO.MemoryStream();
byte[] buffer = new byte[1024];
do
{
// Use the helper function 'Read' to read from the source
read = Read(io, handle, 1, 1024, ref buffer);
// Store the data in a temporary buffer
stream.Write(buffer, 0, read);
}while (read != 0);
// Set the memory stream back to the beginning.
stream.Position = 0;
// Unzip the stream
GZipStream zipStream = new GZipStream(stream, CompressionMode.Decompress);
// Create a serializer
BinaryFormatter formatter = new BinaryFormatter();
// Deserialize the stream
sdib = (SerialDib)formatter.Deserialize(zipStream);
// Unload the stream
zipStream.Dispose();
// Use 'ConvertFromRawBits and the deserialized struct to recreate the bitmap
// In this case the marshaller is used to create the needed IntPtr to the data
// array.
FIBITMAP dib = FreeImage.ConvertFromRawBits(
Marshal.UnsafeAddrOfPinnedArrayElement(sdib.data, 0),
(int)sdib.width, (int)sdib.height, sdib.pitch, sdib.bpp,
sdib.red_mask, sdib.green_mask, sdib.blue_mask,
false);
// Unload the temporary stream
stream.Dispose();
// Return the created bitmap
return(dib);
}
// Loading function
protected override FIBITMAP LoadProc(ref FreeImageIO io, fi_handle handle, int page, int flags, IntPtr data)
{
// Check if the data has the correct format
if (!ValidateProc(ref io, handle))
{
// Create a free-image message
FreeImage.OutputMessageProc(format, "Invalid format.");
// return 0 (operation failed)
return FIBITMAP.Zero;
}
SerialDib sdib;
int read = 0;
System.IO.MemoryStream stream = new System.IO.MemoryStream();
byte[] buffer = new byte[1024];
do
{
// Use the helper function 'Read' to read from the source
read = Read(io, handle, 1, 1024, ref buffer);
// Store the data in a temporary buffer
stream.Write(buffer, 0, read);
}
while (read != 0);
// Set the memory stream back to the beginning.
stream.Position = 0;
// Unzip the stream
GZipStream zipStream = new GZipStream(stream, CompressionMode.Decompress);
// Create a serializer
BinaryFormatter formatter = new BinaryFormatter();
// Deserialize the stream
sdib = (SerialDib)formatter.Deserialize(zipStream);
// Unload the stream
zipStream.Dispose();
// Use 'ConvertFromRawBits and the deserialized struct to recreate the bitmap
// In this case the marshaller is used to create the needed IntPtr to the data
// array.
FIBITMAP dib = FreeImage.ConvertFromRawBits(
Marshal.UnsafeAddrOfPinnedArrayElement(sdib.data, 0),
(int)sdib.width, (int)sdib.height, sdib.pitch, sdib.bpp,
sdib.red_mask, sdib.green_mask, sdib.blue_mask,
false);
// Unload the temporary stream
stream.Dispose();
// Return the created bitmap
return dib;
}
// The function reads the first bytes of the file and compares it
// with the predefined header.
protected override bool ValidateProc(ref FreeImageIO io, fi_handle handle)
{
for (int i = 0; i < header.Length; i++)
{
if (ReadByte(io, handle) != header[i])
{
return(false);
}
}
return(true);
}
public void fi_handle()
{
fi_handle var = new fi_handle();
Assert.IsTrue(var.IsNull);
string test = "hello word!";
using (var = new fi_handle(test))
{
Assert.IsFalse(var.IsNull);
object obj = var.GetObject();
Assert.That(obj is string);
Assert.AreSame(obj, test);
}
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual IntPtr OpenProc(ref FreeImageIO io, fi_handle handle, bool read)
{
return(IntPtr.Zero);
}
public static extern FIMULTIBITMAP OpenMultiBitmapFromHandle(FREE_IMAGE_FORMAT fif, ref FreeImageIO io, fi_handle handle, FREE_IMAGE_LOAD_FLAGS flags);
public static extern FREE_IMAGE_FORMAT GetFileTypeFromHandle(ref FreeImageIO io, fi_handle handle, int size);
/// <summary>
/// Seeks in an unmanaged stream.
/// </summary>
protected int Seek(FreeImageIO io, fi_handle handle, int offset, SeekOrigin origin)
{
return(io.seekProc(handle, offset, origin));
}
public void FreeImageStreamIO()
{
Random rand = new Random();
byte[] bBuffer = new byte[256];
IntPtr buffer = Marshal.AllocHGlobal(256);
MemoryStream stream = new MemoryStream();
Assert.IsNotNull(stream);
using (fi_handle handle = new fi_handle(stream))
{
FreeImageIO io = FreeImageAPI.IO.FreeImageStreamIO.io;
Assert.IsNotNull(io.readProc);
Assert.IsNotNull(io.writeProc);
Assert.IsNotNull(io.seekProc);
Assert.IsNotNull(io.tellProc);
//
// Procs
//
rand.NextBytes(bBuffer);
stream.Write(bBuffer, 0, bBuffer.Length);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read one block
Assert.That(io.readProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read 1 byte block
Assert.That(io.readProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
rand.NextBytes(bBuffer);
for (int i = 0; i < bBuffer.Length; i++)
Marshal.WriteByte(buffer, i, bBuffer[i]);
// Write one block
Assert.That(io.writeProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
// write 1 byte block
Assert.That(io.writeProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
Assert.That(io.tellProc(handle) == stream.Position);
// Seek and tell
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.seekProc(handle, 127, SeekOrigin.Current) == 0);
Assert.That(io.tellProc(handle) == 127);
Assert.That(io.seekProc(handle, 0, SeekOrigin.End) == 0);
Assert.That(io.tellProc(handle) == 256);
Marshal.FreeHGlobal(buffer);
stream.Dispose();
}
}
/// <summary>
/// Saves a previously loaded FreeImage bitmap to a stream.
/// The stream must be set to the correct position before calling SaveToStream.
/// </summary>
/// <param name="dib">Handle to a FreeImage bitmap.</param>
/// <param name="stream">The stream to write to.</param>
/// <param name="format">Format of the image.</param>
/// <param name="flags">Flags to enable or disable plugin-features.</param>
/// <param name="colorDepth">The new color depth of the bitmap.
/// Set to <see cref="FREE_IMAGE_COLOR_DEPTH.FICD_AUTO"/> if SaveToStream should
/// take the best suitable color depth.
/// If a color depth is selected that the provided format cannot write an
/// error-message will be thrown.</param>
/// <param name="unloadSource">When true the structure will be unloaded on success.</param>
/// <returns>Returns true on success, false on failure.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="dib"/> or <paramref name="stream"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="stream"/> cannot write.</exception>
public static bool SaveToStream(
ref FIBITMAP dib,
Stream stream,
FREE_IMAGE_FORMAT format,
FREE_IMAGE_SAVE_FLAGS flags,
FREE_IMAGE_COLOR_DEPTH colorDepth,
bool unloadSource)
{
if (dib.IsNull)
{
throw new ArgumentNullException("dib");
}
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanWrite)
{
throw new ArgumentException("stream is not capable of writing.");
}
if ((!FIFSupportsWriting(format)) || (!FIFSupportsExportType(format, FREE_IMAGE_TYPE.FIT_BITMAP)))
{
return false;
}
FIBITMAP dibToSave = PrepareBitmapColorDepth(dib, format, colorDepth);
bool result = false;
try
{
// Create a 'FreeImageIO' structure for calling 'SaveToHandle'
FreeImageIO io = FreeImageStreamIO.io;
using (fi_handle handle = new fi_handle(stream))
{
result = SaveToHandle(format, dibToSave, ref io, handle, flags);
}
}
catch
{
// Always unload a temporary created bitmap.
if (dibToSave != dib)
{
UnloadEx(ref dibToSave);
}
// On success unload the bitmap
if (result && unloadSource)
{
UnloadEx(ref dib);
}
}
return result;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual bool SaveProc(ref FreeImageIO io, FIBITMAP dib, fi_handle handle, int page, int flags, IntPtr data)
{
return false;
}
/// <summary>
/// Reads a single byte from an unmanaged stream.
/// </summary>
protected unsafe int ReadByte(FreeImageIO io, fi_handle handle)
{
byte buffer = 0;
return (int)io.readProc(new IntPtr(&buffer), 1, 1, handle) > 0 ? buffer : -1;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual int PageCountProc(ref FreeImageIO io, fi_handle handle, IntPtr data)
{
return 0;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual IntPtr OpenProc(ref FreeImageIO io, fi_handle handle, bool read)
{
return IntPtr.Zero;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual FIBITMAP LoadProc(ref FreeImageIO io, fi_handle handle, int page, int flags, IntPtr data)
{
return FIBITMAP.Zero;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual void CloseProc(ref FreeImageIO io, fi_handle handle, IntPtr data)
{
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual int PageCapabilityProc(ref FreeImageIO io, fi_handle handle, IntPtr data)
{
return(0);
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual bool SaveProc(ref FreeImageIO io, FIBITMAP dib, fi_handle handle, int page, int flags, IntPtr data)
{
return(false);
}
// Saving function
protected override bool SaveProc(ref FreeImageIO io, FIBITMAP dib, fi_handle handle, int page, int flags, IntPtr data)
{
SerialDib sdib;
uint size = FreeImage.GetDIBSize(dib);
// Store all data needed to recreate the bitmap
sdib.width = FreeImage.GetWidth(dib);
sdib.height = FreeImage.GetHeight(dib);
sdib.pitch = (int)FreeImage.GetPitch(dib);
sdib.bpp = FreeImage.GetBPP(dib);
sdib.red_mask = FreeImage.GetRedMask(dib);
sdib.green_mask = FreeImage.GetGreenMask(dib);
sdib.blue_mask = FreeImage.GetBlueMask(dib);
sdib.data = new byte[size];
// Copy the bitmaps data into the structures byte-array
// The marshaller is used to create an IntPtr for using
// 'ConvertToRawBits'.
FreeImage.ConvertToRawBits(Marshal.UnsafeAddrOfPinnedArrayElement(sdib.data, 0),
dib, sdib.pitch, sdib.bpp,
sdib.red_mask, sdib.green_mask, sdib.blue_mask,
false);
// Use the healper function to write the header to the destination
if (Write(io, handle, (uint)header.Length, 1, ref header) != 1)
return false;
// Create a serializer
BinaryFormatter formatter = new BinaryFormatter();
// Create a temporary stream
MemoryStream stream = new MemoryStream();
// Create a compression stream
GZipStream zipStream = new GZipStream(stream, CompressionMode.Compress);
// Serialize the structure into the compression stream
formatter.Serialize(zipStream, sdib);
// Unload the compression stream
zipStream.Dispose();
// Get the result data
byte[] buffer = stream.GetBuffer();
// Use the healper function 'Write' to write the data to the destination
if (Write(io, handle, 1, (uint)buffer.Length, ref buffer) != buffer.Length)
{
// Unload the temporary stream
stream.Dispose();
return false;
}
// Unload the temporary stream
stream.Dispose();
return true;
}
/// <summary>
/// Orders FreeImage to analyze the bitmap signature.
/// In case the stream is not seekable, the stream will have been used
/// and must be recreated for loading.
/// </summary>
/// <param name="stream">Name of the stream to analyze.</param>
/// <returns>Type of the bitmap.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="stream"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="stream"/> can not read.</exception>
public static FREE_IMAGE_FORMAT GetFileTypeFromStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanRead)
{
throw new ArgumentException("stream is not capable of reading.");
}
// Wrap the stream if it cannot seek
stream = (stream.CanSeek) ? stream : new StreamWrapper(stream, true);
// Create a 'FreeImageIO' structure for the stream
FreeImageIO io = FreeImageStreamIO.io;
using (fi_handle handle = new fi_handle(stream))
{
return GetFileTypeFromHandle(ref io, handle, 0);
}
}
public void FreeImage_LoadFromHandle()
{
byte[] data = File.ReadAllBytes(iManager.GetBitmapPath(ImageType.Even, ImageColorType.Type_16_555));
MemoryStream mStream = new MemoryStream(data);
FreeImageIO io = FreeImageStreamIO.io;
using (fi_handle handle = new fi_handle(mStream))
{
dib = FreeImage.LoadFromHandle(FREE_IMAGE_FORMAT.FIF_BMP, ref io, handle, FREE_IMAGE_LOAD_FLAGS.DEFAULT);
Assert.That(!dib.IsNull);
FreeImage.UnloadEx(ref dib);
}
}
/// <summary>
/// Seeks in an unmanaged stream.
/// </summary>
protected int Seek(FreeImageIO io, fi_handle handle, int offset, SeekOrigin origin)
{
return io.seekProc(handle, offset, origin);
}
public void fi_handle()
{
fi_handle var = new fi_handle();
Assert.IsTrue(var.IsNull);
string test = "hello word!";
using (var = new fi_handle(test))
{
Assert.IsFalse(var.IsNull);
object obj = var.GetObject();
Assert.That(obj is string);
Assert.AreSame(obj, test);
}
}
// The function reads the first bytes of the file and compares it
// with the predefined header.
protected override bool ValidateProc(ref FreeImageIO io, fi_handle handle)
{
for (int i = 0; i < header.Length; i++)
if (ReadByte(io, handle) != header[i])
return false;
return true;
}
/// <summary>
/// Retrieves the position of an unmanaged stream.
/// </summary>
protected int Tell(FreeImageIO io, fi_handle handle)
{
return io.tellProc(handle);
}
/// <summary>
/// Reads a single byte from an unmanaged stream.
/// </summary>
protected unsafe int ReadByte(FreeImageIO io, fi_handle handle)
{
byte buffer = 0;
return((int)io.readProc(new IntPtr(&buffer), 1, 1, handle) > 0 ? buffer : -1);
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual bool ValidateProc(ref FreeImageIO io, fi_handle handle)
{
return false;
}
/// <summary>
/// Writes a single byte to an unmanaged stream.
/// </summary>
protected unsafe int WriteByte(FreeImageIO io, fi_handle handle, byte value)
{
return((int)io.writeProc(new IntPtr(&value), 1, 1, handle));
}
/// <summary>
/// Writes to an unmanaged stream.
/// </summary>
protected unsafe int Write(FreeImageIO io, fi_handle handle, uint size, uint count, ref byte[] buffer)
{
fixed (byte* ptr = buffer)
{
return (int)io.writeProc(new IntPtr(ptr), size, count, handle);
}
}
/// <summary>
/// Retrieves the position of an unmanaged stream.
/// </summary>
protected int Tell(FreeImageIO io, fi_handle handle)
{
return(io.tellProc(handle));
}
/// <summary>
/// Writes a single byte to an unmanaged stream.
/// </summary>
protected unsafe int WriteByte(FreeImageIO io, fi_handle handle, byte value)
{
return (int)io.writeProc(new IntPtr(&value), 1, 1, handle);
}
public static extern FIBITMAP LoadFromHandle(FREE_IMAGE_FORMAT fif, ref FreeImageIO io, fi_handle handle, FREE_IMAGE_LOAD_FLAGS flags);
/// <summary>
/// Moves the streams position.
/// </summary>
static int streamSeek(fi_handle handle, int offset, SeekOrigin origin)
{
Stream stream = handle.GetObject() as Stream;
if (stream == null)
{
return 1;
}
stream.Seek((long)offset, origin);
return 0;
}
public static extern bool SaveToHandle(FREE_IMAGE_FORMAT fif, FIBITMAP dib, ref FreeImageIO io, fi_handle handle, FREE_IMAGE_SAVE_FLAGS flags);
/// <summary>
/// Returns the streams current position
/// </summary>
static int streamTell(fi_handle handle)
{
Stream stream = handle.GetObject() as Stream;
if (stream == null)
{
return -1;
}
return (int)stream.Position;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual void CloseProc(ref FreeImageIO io, fi_handle handle, IntPtr data)
{
}
/// <summary>
/// Reads the given data and writes it into the stream.
/// </summary>
static unsafe uint streamWrite(IntPtr buffer, uint size, uint count, fi_handle handle)
{
Stream stream = handle.GetObject() as Stream;
if ((stream == null) || (!stream.CanWrite))
{
return 0;
}
uint writeCount = 0;
byte[] bufferTemp = new byte[size];
byte* ptr = (byte*)buffer;
while (writeCount < count)
{
for (int i = 0; i < size; i++, ptr++)
{
bufferTemp[i] = *ptr;
}
try
{
stream.Write(bufferTemp, 0, bufferTemp.Length);
}
catch
{
return writeCount;
}
writeCount++;
}
return writeCount;
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual FIBITMAP LoadProc(ref FreeImageIO io, fi_handle handle, int page, int flags, IntPtr data)
{
return(FIBITMAP.Zero);
}
public void FreeImageStreamIO()
{
Random rand = new Random();
byte[] bBuffer = new byte[256];
IntPtr buffer = Marshal.AllocHGlobal(256);
MemoryStream stream = new MemoryStream();
Assert.IsNotNull(stream);
using (fi_handle handle = new fi_handle(stream))
{
FreeImageIO io = FreeImageAPI.IO.FreeImageStreamIO.io;
Assert.IsNotNull(io.readProc);
Assert.IsNotNull(io.writeProc);
Assert.IsNotNull(io.seekProc);
Assert.IsNotNull(io.tellProc);
//
// Procs
//
rand.NextBytes(bBuffer);
stream.Write(bBuffer, 0, bBuffer.Length);
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read one block
Assert.That(io.readProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
// Read 1 byte block
Assert.That(io.readProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == stream.Position);
rand.NextBytes(bBuffer);
for (int i = 0; i < bBuffer.Length; i++)
{
Marshal.WriteByte(buffer, i, bBuffer[i]);
}
// Write one block
Assert.That(io.writeProc(buffer, (uint)bBuffer.Length, 1, handle) == 1);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
// write 1 byte block
Assert.That(io.writeProc(buffer, 1, (uint)bBuffer.Length, handle) == bBuffer.Length);
for (int i = 0; i < bBuffer.Length; i++)
{
Assert.That(Marshal.ReadByte(buffer, i) == bBuffer[i]);
}
Assert.That(io.tellProc(handle) == stream.Position);
// Seek and tell
Assert.That(io.seekProc(handle, 0, SeekOrigin.Begin) == 0);
Assert.That(io.tellProc(handle) == 0);
Assert.That(io.seekProc(handle, 127, SeekOrigin.Current) == 0);
Assert.That(io.tellProc(handle) == 127);
Assert.That(io.seekProc(handle, 0, SeekOrigin.End) == 0);
Assert.That(io.tellProc(handle) == 256);
Marshal.FreeHGlobal(buffer);
stream.Dispose();
}
}
/// <summary>
/// Function that can be implemented.
/// </summary>
protected virtual bool ValidateProc(ref FreeImageIO io, fi_handle handle)
{
return(false);
}
/// <summary>
/// Loads a FreeImage bitmap.
/// In case the loading format is <see cref="FREE_IMAGE_FORMAT.FIF_UNKNOWN"/>
/// the bitmaps real format is being analysed.
/// The stream must be set to the correct position before calling LoadFromStream.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <param name="flags">Flags to enable or disable plugin-features.</param>
/// <param name="format">Format of the image. If the format is unknown use
/// <see cref="FREE_IMAGE_FORMAT.FIF_UNKNOWN"/>.
/// In case a suitable format was found by LoadFromStream it will be returned in format.</param>
/// <returns>Handle to a FreeImage bitmap.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="stream"/> is null.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="stream"/> is not capable of reading.</exception>
public static FIBITMAP LoadFromStream(
Stream stream,
FREE_IMAGE_LOAD_FLAGS flags,
ref FREE_IMAGE_FORMAT format)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanRead)
{
throw new ArgumentException("stream is not capable of reading.");
}
// Wrap the source stream if it is unable to seek (which is required by FreeImage)
stream = (stream.CanSeek) ? stream : new StreamWrapper(stream, true);
// Save the streams position
if (format == FREE_IMAGE_FORMAT.FIF_UNKNOWN)
{
long position = stream.Position;
// Get the format of the bitmap
format = GetFileTypeFromStream(stream);
// Restore the streams position
stream.Position = position;
}
if (!FIFSupportsReading(format))
{
return 0;
}
// Create a 'FreeImageIO' structure for calling 'LoadFromHandle'
// using the internal structure 'FreeImageStreamIO'.
FreeImageIO io = FreeImageStreamIO.io;
using (fi_handle handle = new fi_handle(stream))
{
return LoadFromHandle(format, ref io, handle, flags);
}
}