/// <devdoc>
/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object.
/// See ConvertToMemory for more info.
/// </devdoc>
internal static EncoderParameters ConvertFromMemory(IntPtr memory)
{
if (memory == IntPtr.Zero)
{
throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter);
}
int count = Marshal.ReadIntPtr(memory).ToInt32();
EncoderParameters p = new EncoderParameters(count);
int size = Marshal.SizeOf(typeof(EncoderParameter));
long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr));
for (int i = 0; i < count; i++)
{
Guid guid = (Guid)UnsafeNativeMethods.PtrToStructure((IntPtr)(i * size + arrayOffset), typeof(Guid));
int numberOfValues = Marshal.ReadInt32((IntPtr)(i * size + arrayOffset + 16));
EncoderParameterValueType type = (EncoderParameterValueType)Marshal.ReadInt32((IntPtr)(i * size + arrayOffset + 20));
IntPtr value = Marshal.ReadIntPtr((IntPtr)(i * size + arrayOffset + 24));
p._param[i] = new EncoderParameter(new Encoder(guid), numberOfValues, type, value);
}
return(p);
}
private static jthread alloc_thread(JNIEnvHandle jniEnv)
{
jniNativeInterface nativeInterface = (jniNativeInterface)Marshal.PtrToStructure(Marshal.ReadIntPtr(jniEnv.Handle), typeof(jniNativeInterface));
jclass @class = nativeInterface.FindClass(jniEnv, "java/lang/Thread");
if (@class == jclass.Null)
{
throw new Exception("ERROR: JNI: Cannot find %s with FindClass.");
}
nativeInterface.ExceptionClear(jniEnv);
jmethodID method = nativeInterface.GetMethodID(jniEnv, @class, "<init>", "()V");
if (method == jmethodID.Null)
{
throw new Exception("Cannot find Thread constructor method.");
}
nativeInterface.ExceptionClear(jniEnv);
jthread result = (jthread)nativeInterface.NewObject(jniEnv, @class, method);
if (result == jthread.Null)
{
throw new Exception("Cannot create new Thread object");
}
nativeInterface.ExceptionClear(jniEnv);
return(result);
}
