/// <summary>
/// Map a GType to the name of the C# type we use to represent it.
/// </summary>
/// <param name="gtype">The GType to map.</param>
/// <returns>The C# type we use to represent it.</returns>
public static string GTypeToCSharp(IntPtr gtype)
{
var fundamental = GType.Fundamental(gtype);
if (GTypeToCSharpDict.ContainsKey(gtype))
{
return(GTypeToCSharpDict[gtype]);
}
if (GTypeToCSharpDict.ContainsKey(fundamental))
{
return(GTypeToCSharpDict[fundamental]);
}
return("object");
}
/// <summary>
/// Set a GValue.
/// </summary>
/// <remarks>
/// The value is converted to the type of the GValue, if possible, and
/// assigned.
/// </remarks>
/// <param name="value">Value to be set.</param>
public void Set(object value)
{
// logger.Debug($"Set: value = {value}");
var gtype = GetTypeOf();
var fundamental = GType.Fundamental(gtype);
if (gtype == GBoolType)
{
Internal.GValue.SetBoolean(ref Struct, Convert.ToBoolean(value));
}
else if (gtype == GIntType)
{
Internal.GValue.SetInt(ref Struct, Convert.ToInt32(value));
}
else if (gtype == GUint64Type)
{
Internal.GValue.SetUint64(ref Struct, Convert.ToUInt64(value));
}
else if (gtype == GDoubleType)
{
Internal.GValue.SetDouble(ref Struct, Convert.ToDouble(value));
}
else if (fundamental == GEnumType)
{
Internal.GValue.SetEnum(ref Struct, Convert.ToInt32(value));
}
else if (fundamental == GFlagsType)
{
Internal.GValue.SetFlags(ref Struct, Convert.ToUInt32(value));
}
else if (gtype == GStrType)
{
var bytes = Encoding.UTF8.GetBytes(Convert.ToString(value) + char.MinValue); // Ensure null-terminated string
Internal.GValue.SetString(ref Struct, bytes);
}
else if (gtype == RefStrType)
{
var bytes = Encoding.UTF8.GetBytes(Convert.ToString(value) + char.MinValue); // Ensure null-terminated string
VipsValue.SetRefString(ref Struct, bytes);
}
else if (fundamental == GObjectType && value is GObject gObject)
{
AddMemoryPressure(gObject.MemoryPressure);
Internal.GValue.SetObject(ref Struct, gObject);
}
else if (gtype == ArrayIntType)
{
if (!(value is IEnumerable))
{
value = new[] { value };
}
int[] integers;
switch (value)
{
case int[] ints:
integers = ints;
break;
case double[] doubles:
integers = Array.ConvertAll(doubles, Convert.ToInt32);
break;
case object[] objects:
integers = Array.ConvertAll(objects, Convert.ToInt32);
break;
default:
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {NetVips.TypeName(gtype)}");
}
VipsValue.SetArrayInt(ref Struct, integers, integers.Length);
}
else if (gtype == ArrayDoubleType)
{
if (!(value is IEnumerable))
{
value = new[] { value };
}
double[] doubles;
switch (value)
{
case double[] dbls:
doubles = dbls;
break;
case int[] ints:
doubles = Array.ConvertAll(ints, Convert.ToDouble);
break;
case object[] objects:
doubles = Array.ConvertAll(objects, Convert.ToDouble);
break;
default:
throw new Exception(
$"unsupported value type {value.GetType()} for gtype {NetVips.TypeName(gtype)}");
}
VipsValue.SetArrayDouble(ref Struct, doubles, doubles.Length);
}
else if (gtype == ArrayImageType && value is Image[] images)
{
var size = images.Length;
VipsValue.SetArrayImage(ref Struct, size);
var ptrArr = VipsValue.GetArrayImage(in Struct, out _);
for (var i = 0; i < size; i++)
{
ref var image = ref images[i];
// the gvalue needs a ref on each of the images
Marshal.WriteIntPtr(ptrArr, i * IntPtr.Size, image.ObjectRef());
AddMemoryPressure(image.MemoryPressure);
}
}
/// <summary>
/// Extract the fundamental type ID portion.
/// </summary>
/// <param name="type">A valid type ID.</param>
/// <returns>Fundamental type ID.</returns>
public static IntPtr FundamentalType(IntPtr type)
{
return(GType.Fundamental(type));
}