public WicImageContainer(IWICBitmapDecoder *dec, SafeHandle?src, FileFormat fmt)
{
WicDecoder = dec;
handle = src;
uint fcount;
HRESULT.Check(dec->GetFrameCount(&fcount));
FrameCount = (int)fcount;
ContainerFormat = fmt;
}
public static WicImageContainer Create(IWICBitmapDecoder *dec, SafeHandle?src = null)
{
var guid = default(Guid);
HRESULT.Check(dec->GetContainerFormat(&guid));
var fmt = WicImageDecoder.FormatMap.GetValueOrDefault(guid, FileFormat.Unknown);
if (fmt == FileFormat.Gif)
{
return(new WicGifContainer(dec, src));
}
return(new WicImageContainer(dec, src, fmt));
}
public WicGifContainer(IWICBitmapDecoder *dec, SafeHandle?src) : base(dec, src, FileFormat.Gif)
{
using var meta = default(ComPtr <IWICMetadataQueryReader>);
HRESULT.Check(dec->GetMetadataQueryReader(meta.GetAddressOf()));
ScreenWidth = meta.GetValueOrDefault <ushort>(Wic.Metadata.Gif.LogicalScreenWidth);
ScreenHeight = meta.GetValueOrDefault <ushort>(Wic.Metadata.Gif.LogicalScreenHeight);
if (meta.GetValueOrDefault <bool>(Wic.Metadata.Gif.GlobalPaletteFlag))
{
using var pal = default(ComPtr <IWICPalette>);
HRESULT.Check(Wic.Factory->CreatePalette(pal.GetAddressOf()));
HRESULT.Check(dec->CopyPalette(pal));
uint pcc;
HRESULT.Check(pal.Get()->GetColorCount(&pcc));
uint idx = meta.GetValueOrDefault <byte>(Wic.Metadata.Gif.BackgroundColorIndex);
if (idx < pcc)
{
using var buff = new PoolBuffer <uint>((int)pcc);
fixed(uint *pbuff = buff.Span)
{
HRESULT.Check(pal.Get()->GetColors(pcc, pbuff, &pcc));
BackgroundColor = pbuff[idx];
}
}
}
var sbuff = (Span <byte>) stackalloc byte[16];
var appext = meta.GetValueOrDefault(Wic.Metadata.Gif.AppExtension, sbuff);
if (appext.Length == 11 && netscape2_0.SequenceEqual(appext) || animexts1_0.SequenceEqual(appext))
{
var appdata = meta.GetValueOrDefault(Wic.Metadata.Gif.AppExtensionData, sbuff);
if (appdata.Length >= 4 && appdata[0] >= 3 && appdata[1] == 1)
{
LoopCount = BinaryPrimitives.ReadUInt16LittleEndian(appdata.Slice(2));
}
}
}
public int CreateFastMetadataEncoderFromDecoder([NativeTypeName("IWICBitmapDecoder *")] IWICBitmapDecoder *pIDecoder, [NativeTypeName("IWICFastMetadataEncoder **")] IWICFastMetadataEncoder **ppIFastEncoder)
{
return(((delegate * unmanaged[Stdcall] < IWICImagingFactory2 *, IWICBitmapDecoder *, IWICFastMetadataEncoder **, int >)(lpVtbl[24]))((IWICImagingFactory2 *)Unsafe.AsPointer(ref this), pIDecoder, ppIFastEncoder));
}
public HRESULT CreateFastMetadataEncoderFromDecoder(IWICBitmapDecoder *pIDecoder, IWICFastMetadataEncoder **ppIFastEncoder)
{
return(((delegate * unmanaged <IWICComponentFactory *, IWICBitmapDecoder *, IWICFastMetadataEncoder **, int>)(lpVtbl[24]))((IWICComponentFactory *)Unsafe.AsPointer(ref this), pIDecoder, ppIFastEncoder));
}
