/// <summary>
/// Set a GObject property. The value is converted to the property type, if possible.
/// </summary>
/// <param name="name">The name of the property to set.</param>
/// <param name="flags">See <see cref="Enums.ArgumentFlags"/>.</param>
/// <param name="matchImage">A <see cref="Image"/> used as guide.</param>
/// <param name="value">The value.</param>
/// <param name="gtype">The GType of the property.</param>
private void Set(IntPtr gtype, Enums.ArgumentFlags flags, Image matchImage, string name,
object value)
{
// logger.Debug($"Operation.Set: name = {name}, flags = {flags}, " +
// $"matchImage = {matchImage} value = {value}");
// if the object wants an image and we have a constant, Imageize it
//
// if the object wants an image array, Imageize any constants in the
// array
if (matchImage != null)
{
if (gtype == GValue.ImageType)
{
value = Image.Imageize(matchImage, value);
}
else if (gtype == GValue.ArrayImageType)
{
if (!(value is Array values) || values.Rank != 1)
{
throw new Exception(
$"unsupported value type {value.GetType()} for VipsArrayImage");
}
var images = new Image[values.Length];
for (var i = 0; i < values.Length; i++)
{
ref var image = ref images[i];
image = Image.Imageize(matchImage, values.GetValue(i));
}
value = images;
}
}
/// <summary>
/// Set a GObject property. The value is converted to the property type, if possible.
/// </summary>
/// <param name="gtype">The GType of the property.</param>
/// <param name="flags">See <see cref="Enums.ArgumentFlags"/>.</param>
/// <param name="name">The name of the property to set.</param>
/// <param name="value">The value.</param>
private void Set(IntPtr gtype, Enums.ArgumentFlags flags, string name, object value)
{
// MODIFY args need to be copied before they are set
if ((flags & Enums.ArgumentFlags.MODIFY) != 0 && value is Image image)
{
// logger.Debug($"copying MODIFY arg {name}");
// make sure we have a unique copy
value = image.Copy().CopyMemory();
}
Set(gtype, name, value);
}
