/// <summary>
/// Get the contents of a GValue.
/// </summary>
/// <remarks>
/// The contents of the GValue are read out as a C# type.
/// </remarks>
/// <returns></returns>
public object Get()
{
// logger.Debug($"Get: this = {this}");
var gtype = GetTypeOf();
var fundamental = GType.GTypeFundamental(gtype);
object result;
if (gtype == GBoolType)
{
result = Internal.GValue.GValueGetBoolean(ref Struct) != 0;
}
else if (gtype == GIntType)
{
result = Internal.GValue.GValueGetInt(ref Struct);
}
else if (gtype == GDoubleType)
{
result = Internal.GValue.GValueGetDouble(ref Struct);
}
else if (fundamental == GEnumType)
{
result = FromEnum(gtype, Internal.GValue.GValueGetEnum(ref Struct));
}
else if (fundamental == GFlagsType)
{
result = Internal.GValue.GValueGetFlags(ref Struct);
}
else if (gtype == GStrType)
{
result = Internal.GValue.GValueGetString(ref Struct).ToUtf8String();
}
else if (gtype == RefStrType)
{
// don't bother getting the size -- assume these are always
// null-terminated C strings
ulong psize = 0;
result = VipsType.VipsValueGetRefString(ref Struct, ref psize).ToUtf8String();
}
else if (gtype == ImageType)
{
// GValueGetObject() will not add a ref ... that is
// held by the gvalue
var vi = Internal.GObject.GValueGetObject(ref Struct);
// we want a ref that will last with the life of the vimage:
// this ref is matched by the unref that's attached to finalize
// by GObject
var image = new Image(vi);
image.ObjectRef();
result = image;
}
else if (gtype == ArrayIntType)
{
var psize = 0;
var intPtr = VipsType.VipsValueGetArrayInt(ref Struct, ref psize);
var intArr = new int[psize];
Marshal.Copy(intPtr, intArr, 0, psize);
result = intArr;
}
else if (gtype == ArrayDoubleType)
{
var psize = 0;
var intPtr = VipsType.VipsValueGetArrayDouble(ref Struct, ref psize);
var doubleArr = new double[psize];
Marshal.Copy(intPtr, doubleArr, 0, psize);
result = doubleArr;
}
else if (gtype == ArrayImageType)
{
var psize = 0;
var ptrArr = VipsImage.VipsValueGetArrayImage(ref Struct, ref psize);
var images = new Image[psize];
for (var i = 0; i < psize; i++)
{
var vi = Marshal.ReadIntPtr(ptrArr, i * IntPtr.Size);
images[i] = new Image(vi);
images[i].ObjectRef();
}
result = images;
}
else if (gtype == BlobType)
{
ulong psize = 0;
var array = VipsType.VipsValueGetBlob(ref Struct, ref psize);
// Blob types are returned as an array of bytes.
var byteArr = new byte[psize];
Marshal.Copy(array, byteArr, 0, (int)psize);
result = byteArr;
}
else
{
throw new Exception($"unsupported gtype for get {Base.TypeName(gtype)}");
}
return(result);
}
/// <summary>
/// Set a GValue.
/// </summary>
/// <remarks>
/// The value is converted to the type of the GValue, if possible, and
/// assigned.
/// </remarks>
/// <param name="value"></param>
public void Set(object value)
{
// logger.Debug($"Set: value = {value}");
var gtype = GetTypeOf();
var fundamental = GType.GTypeFundamental(gtype);
if (gtype == GBoolType)
{
Internal.GValue.GValueSetBoolean(ref Struct, Convert.ToBoolean(value) ? 1 : 0);
}
else if (gtype == GIntType)
{
Internal.GValue.GValueSetInt(ref Struct, Convert.ToInt32(value));
}
else if (gtype == GDoubleType)
{
Internal.GValue.GValueSetDouble(ref Struct, Convert.ToDouble(value));
}
else if (fundamental == GEnumType)
{
Internal.GValue.GValueSetEnum(ref Struct, ToEnum(gtype, value));
}
else if (fundamental == GFlagsType)
{
Internal.GValue.GValueSetFlags(ref Struct, Convert.ToUInt32(value));
}
else if (gtype == GStrType)
{
var pointer = Convert.ToString(value).ToUtf8Ptr();
Internal.GValue.GValueSetString(ref Struct, pointer);
GLib.GFree(pointer);
}
else if (gtype == RefStrType)
{
var pointer = Convert.ToString(value).ToUtf8Ptr();
VipsType.VipsValueSetRefString(ref Struct, pointer);
GLib.GFree(pointer);
}
else if (fundamental == GObjectType)
{
if (!(value is GObject gObject))
{
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {Base.TypeName(gtype)}"
);
}
Internal.GObject.GValueSetObject(ref Struct, gObject);
}
else if (gtype == ArrayIntType)
{
if (!(value is IEnumerable))
{
value = new[] { value };
}
switch (value)
{
case int[] ints:
VipsType.VipsValueSetArrayInt(ref Struct, ints, ints.Length);
break;
case double[] doubles:
VipsType.VipsValueSetArrayInt(ref Struct, Array.ConvertAll(doubles, Convert.ToInt32),
doubles.Length);
break;
case object[] objects:
VipsType.VipsValueSetArrayInt(ref Struct, Array.ConvertAll(objects, Convert.ToInt32),
objects.Length);
break;
default:
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {Base.TypeName(gtype)}"
);
}
}
else if (gtype == ArrayDoubleType)
{
if (!(value is IEnumerable))
{
value = new[] { value };
}
switch (value)
{
case double[] doubles:
VipsType.VipsValueSetArrayDouble(ref Struct, doubles, doubles.Length);
break;
case int[] ints:
VipsType.VipsValueSetArrayDouble(ref Struct, Array.ConvertAll(ints, Convert.ToDouble),
ints.Length);
break;
case object[] objects:
VipsType.VipsValueSetArrayDouble(ref Struct, Array.ConvertAll(objects, Convert.ToDouble),
objects.Length);
break;
default:
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {Base.TypeName(gtype)}"
);
}
}
else if (gtype == ArrayImageType)
{
if (!(value is Image[] images))
{
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {Base.TypeName(gtype)}"
);
}
var size = images.Length;
VipsImage.VipsValueSetArrayImage(ref Struct, size);
var ptrArr = VipsImage.VipsValueGetArrayImage(ref Struct, IntPtr.Zero);
for (var i = 0; i < size; i++)
{
Marshal.WriteIntPtr(ptrArr, i * IntPtr.Size, images[i].DangerousGetHandle());
// the gvalue needs a ref on each of the images
images[i].ObjectRef();
}
}
else if (gtype == BlobType)
{
int length;
IntPtr memory;
switch (value)
{
case string strValue:
length = Encoding.UTF8.GetByteCount(strValue);
// We need to set the blob to a copy of the string that vips
// can own
memory = strValue.ToUtf8Ptr();
break;
case byte[] byteArrValue:
length = byteArrValue.Length;
memory = byteArrValue.ToPtr();
break;
case char[] charArrValue:
length = Encoding.UTF8.GetByteCount(charArrValue);
memory = Encoding.UTF8.GetBytes(charArrValue).ToPtr();
break;
default:
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {Base.TypeName(gtype)}"
);
}
if (Base.AtLeastLibvips(8, 6))
{
VipsType.VipsValueSetBlobFree(ref Struct, memory, (ulong)length);
}
else
{
int FreeFn(IntPtr a, IntPtr b)
{
GLib.GFree(a);
return(0);
}
VipsType.VipsValueSetBlob(ref Struct, FreeFn, memory, (ulong)length);
}
}
else
{
throw new Exception(
$"unsupported gtype for set {Base.TypeName(gtype)}, fundamental {Base.TypeName(fundamental)}, value type {value.GetType()}"
);
}
}