static GValue()
{
if (NetVips.AtLeastLibvips(8, 6))
{
BlendModeType = Vips.BlendModeGetType();
}
}
static GValue()
{
Vips.BandFormatGetType();
BandFormatType = NetVips.TypeFromName("VipsBandFormat");
if (NetVips.AtLeastLibvips(8, 6))
{
Vips.BlendModeGetType();
BlendModeType = NetVips.TypeFromName("VipsBlendMode");
}
}
static GValue()
{
if (NetVips.AtLeastLibvips(8, 6))
{
BlendModeType = Vips.BlendModeGetType();
}
if (NetVips.AtLeastLibvips(8, 9))
{
SourceType = NetVips.TypeFromName("VipsSource");
TargetType = NetVips.TypeFromName("VipsTarget");
}
}
/// <summary>
/// Get all arguments for an operation.
/// </summary>
/// <remarks>
/// Not quick! Try to call this infrequently.
/// </remarks>
/// <param name="operation">Operation to lookup.</param>
/// <returns>Arguments for the operation.</returns>
private IEnumerable <KeyValuePair <string, Enums.ArgumentFlags> > GetArgs(Operation operation)
{
var args = new List <KeyValuePair <string, Enums.ArgumentFlags> >();
void AddArg(string name, Enums.ArgumentFlags flags)
{
// libvips uses '-' to separate parts of arg names, but we
// need '_' for C#
name = name.Replace("-", "_");
args.Add(new KeyValuePair <string, Enums.ArgumentFlags>(name, flags));
}
// vips_object_get_args was added in 8.7
if (NetVips.AtLeastLibvips(8, 7))
{
var result = Internal.VipsObject.GetArgs(operation, out var names, out var flags, out var nArgs);
if (result != 0)
{
throw new VipsException("unable to get arguments from operation");
}
for (var i = 0; i < nArgs; i++)
{
var flag = (Enums.ArgumentFlags)Marshal.PtrToStructure(flags + i * sizeof(int), typeof(int));
if ((flag & Enums.ArgumentFlags.CONSTRUCT) == 0)
{
continue;
}
var name = Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(names, i * IntPtr.Size));
AddArg(name, flag);
}
}
else
{
IntPtr AddConstruct(IntPtr self, IntPtr pspec, IntPtr argumentClass, IntPtr argumentInstance,
IntPtr a,
IntPtr b)
{
var flags = argumentClass.Dereference <VipsArgumentClass>().Flags;
if ((flags & Enums.ArgumentFlags.CONSTRUCT) == 0)
{
return(IntPtr.Zero);
}
var name = Marshal.PtrToStringAnsi(pspec.Dereference <GParamSpec.Struct>().Name);
AddArg(name, flags);
return(IntPtr.Zero);
}
Vips.ArgumentMap(operation, AddConstruct, IntPtr.Zero, IntPtr.Zero);
}
return(args);
}
