internal static IntPtr InitFromStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentException("stream");
}
IntPtr imagePtr;
Status st;
// Seeking required
if (!stream.CanSeek)
{
byte[] buffer = new byte[256];
int index = 0;
int count;
do
{
if (buffer.Length < index + 256)
{
byte[] newBuffer = new byte[buffer.Length * 2];
Array.Copy(buffer, newBuffer, buffer.Length);
buffer = newBuffer;
}
count = stream.Read(buffer, index, 256);
index += count;
}while (count != 0);
stream = new MemoryStream(buffer, 0, index);
}
if (GDIPlus.RunningOnUnix())
{
// Unix, with libgdiplus
// We use a custom API for this, because there's no easy way
// to get the Stream down to libgdiplus. So, we wrap the stream
// with a set of delegates.
GDIPlus.GdiPlusStreamHelper sh = new GDIPlus.GdiPlusStreamHelper(stream, true);
st = GDIPlus.GdipLoadImageFromDelegate_linux(sh.GetHeaderDelegate, sh.GetBytesDelegate,
sh.PutBytesDelegate, sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, out imagePtr);
}
else
{
st = GDIPlus.GdipLoadImageFromStream(new ComIStreamWrapper(stream), out imagePtr);
}
GDIPlus.CheckStatus(st);
return(imagePtr);
}
public void Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
{
Status st;
IntPtr nativeEncoderParams;
Guid guid = encoder.Clsid;
if (encoderParams == null)
{
nativeEncoderParams = IntPtr.Zero;
}
else
{
nativeEncoderParams = encoderParams.ToNativePtr();
}
try
{
if (GDIPlus.RunningOnUnix())
{
GDIPlus.GdiPlusStreamHelper sh = new GDIPlus.GdiPlusStreamHelper(stream, false);
st = GDIPlus.GdipSaveImageToDelegate_linux(nativeObject, sh.GetBytesDelegate, sh.PutBytesDelegate,
sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, ref guid, nativeEncoderParams);
}
else
{
st = GDIPlus.GdipSaveImageToStream(new HandleRef(this, nativeObject),
new ComIStreamWrapper(stream), ref guid, new HandleRef(encoderParams, nativeEncoderParams));
}
}
finally
{
if (nativeEncoderParams != IntPtr.Zero)
{
Marshal.FreeHGlobal(nativeEncoderParams);
}
}
GDIPlus.CheckStatus(st);
}
public void Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
{
Status st;
IntPtr nativeEncoderParams;
Guid guid = encoder.Clsid;
if (encoderParams == null)
nativeEncoderParams = IntPtr.Zero;
else
nativeEncoderParams = encoderParams.ToNativePtr ();
try {
if (GDIPlus.RunningOnUnix ()) {
GDIPlus.GdiPlusStreamHelper sh = new GDIPlus.GdiPlusStreamHelper (stream, false);
st = GDIPlus.GdipSaveImageToDelegate_linux (nativeObject, sh.GetBytesDelegate, sh.PutBytesDelegate,
sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, ref guid, nativeEncoderParams);
} else {
st = GDIPlus.GdipSaveImageToStream (new HandleRef (this, nativeObject),
new ComIStreamWrapper (stream), ref guid, new HandleRef (encoderParams, nativeEncoderParams));
}
}
finally {
if (nativeEncoderParams != IntPtr.Zero)
Marshal.FreeHGlobal (nativeEncoderParams);
}
GDIPlus.CheckStatus (st);
}
internal static IntPtr InitFromStream (Stream stream)
{
if (stream == null)
throw new ArgumentException ("stream");
IntPtr imagePtr;
Status st;
// Seeking required
if (!stream.CanSeek) {
byte[] buffer = new byte[256];
int index = 0;
int count;
do {
if (buffer.Length < index + 256) {
byte[] newBuffer = new byte[buffer.Length * 2];
Array.Copy(buffer, newBuffer, buffer.Length);
buffer = newBuffer;
}
count = stream.Read(buffer, index, 256);
index += count;
}
while (count != 0);
stream = new MemoryStream(buffer, 0, index);
}
if (GDIPlus.RunningOnUnix ()) {
// Unix, with libgdiplus
// We use a custom API for this, because there's no easy way
// to get the Stream down to libgdiplus. So, we wrap the stream
// with a set of delegates.
GDIPlus.GdiPlusStreamHelper sh = new GDIPlus.GdiPlusStreamHelper (stream, true);
st = GDIPlus.GdipLoadImageFromDelegate_linux (sh.GetHeaderDelegate, sh.GetBytesDelegate,
sh.PutBytesDelegate, sh.SeekDelegate, sh.CloseDelegate, sh.SizeDelegate, out imagePtr);
} else {
st = GDIPlus.GdipLoadImageFromStream (new ComIStreamWrapper (stream), out imagePtr);
}
return st == Status.Ok ? imagePtr : IntPtr.Zero;
}
