/// <summary>
/// Helper method that will retrieve ColorContexts from an unmanaged object (e.g. BitmapDecoder or BitmapFrameDecode)
/// </summary>
internal static IList <ColorContext> GetColorContextsHelper(GetColorContextsDelegate getColorContexts)
{
uint numContexts = 0;
List <ColorContext> colorContextsList = null;
int hr = getColorContexts(ref numContexts, null);
if (hr != (int)WinCodecErrors.WINCODEC_ERR_UNSUPPORTEDOPERATION)
{
HRESULT.Check(hr);
}
if (numContexts > 0)
{
// GetColorContexts does not create new IWICColorContexts. Instead, it initializes existing
// ones so we must create them beforehand.
SafeMILHandle[] colorContextHandles = new SafeMILHandle[numContexts];
using (FactoryMaker factoryMaker = new FactoryMaker())
{
for (uint i = 0; i < numContexts; ++i)
{
HRESULT.Check(UnsafeNativeMethodsMilCoreApi.WICCodec.CreateColorContext(factoryMaker.ImagingFactoryPtr, out colorContextHandles[i]));
}
}
// The Marshal is unable to handle SafeMILHandle[] so we will convert it to an IntPtr[] ourselves.
{
IntPtr[] colorContextPtrs = new IntPtr[numContexts];
for (uint i = 0; i < numContexts; ++i)
{
colorContextPtrs[i] = colorContextHandles[i].DangerousGetHandle();
}
HRESULT.Check(getColorContexts(ref numContexts, colorContextPtrs));
}
colorContextsList = new List <ColorContext>((int)numContexts);
for (uint i = 0; i < numContexts; ++i)
{
colorContextsList.Add(new ColorContext(colorContextHandles[i]));
}
}
return(colorContextsList);
}
internal static IList<ColorContext> GetColorContextsHelper(GetColorContextsDelegate getColorContexts)
{
uint numContexts = 0;
List<ColorContext> colorContextsList = null;
int hr = getColorContexts(ref numContexts, null);
if (hr != (int)WinCodecErrors.WINCODEC_ERR_UNSUPPORTEDOPERATION)
{
HRESULT.Check(hr);
}
if (numContexts > 0)
{
// GetColorContexts does not create new IWICColorContexts. Instead, it initializes existing
// ones so we must create them beforehand.
SafeMILHandle[] colorContextHandles = new SafeMILHandle[numContexts];
using (FactoryMaker factoryMaker = new FactoryMaker())
{
for (uint i = 0; i < numContexts; ++i)
{
HRESULT.Check(UnsafeNativeMethodsMilCoreApi.WICCodec.CreateColorContext(factoryMaker.ImagingFactoryPtr, out colorContextHandles[i]));
}
}
// The Marshal is unable to handle SafeMILHandle[] so we will convert it to an IntPtr[] ourselves.
{
IntPtr[] colorContextPtrs = new IntPtr[numContexts];
for (uint i = 0; i < numContexts; ++i)
{
colorContextPtrs[i] = colorContextHandles[i].DangerousGetHandle();
}
HRESULT.Check(getColorContexts(ref numContexts, colorContextPtrs));
}
colorContextsList = new List<ColorContext>((int)numContexts);
for (uint i = 0; i < numContexts; ++i)
{
colorContextsList.Add(new ColorContext(colorContextHandles[i]));
}
}
return colorContextsList;