public WicImageContainer(IWICBitmapDecoder dec, WicPipelineContext ctx, FileFormat fmt)
{
WicDecoder = ctx.AddRef(dec);
ContainerFormat = fmt;
FrameCount = (int)dec.GetFrameCount();
}
private WicImageContainer(IWICBitmapDecoder dec, WicPipelineContext ctx)
{
wicContext = ctx;
WicDecoder = ctx.AddRef(dec);
WicContainerFormat = dec.GetContainerFormat();
ContainerFormat = formatMap.GetValueOrDefault(WicContainerFormat, FileFormat.Unknown);
FrameCount = (int)dec.GetFrameCount();
}
unsafe public static WicImageContainer Create(ReadOnlySpan <byte> inBuffer, WicPipelineContext ctx)
{
fixed(byte *pbBuffer = inBuffer)
{
var istm = ctx.AddRef(Wic.Factory.CreateStream());
istm.InitializeFromMemory((IntPtr)pbBuffer, (uint)inBuffer.Length);
var dec = createDecoder(stm => Wic.Factory.CreateDecoderFromStream(stm, null, WICDecodeOptions.WICDecodeMetadataCacheOnDemand), istm);
return(new WicImageContainer(dec, ctx));
}
}
public WicGifContainer(IWICBitmapDecoder dec, WicPipelineContext ctx) : base(dec, ctx, FileFormat.Gif)
{
using var wicmeta = ComHandle.Wrap(dec.GetMetadataQueryReader());
var meta = wicmeta.ComObject;
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 wicpal = ComHandle.Wrap(Wic.Factory.CreatePalette());
var pal = wicpal.ComObject;
dec.CopyPalette(pal);
uint pcc = pal.GetColorCount();
uint idx = meta.GetValueOrDefault <byte>(Wic.Metadata.Gif.BackgroundColorIndex);
if (idx < pcc)
{
var buff = ArrayPool <uint> .Shared.Rent((int)pcc);
pal.GetColors(pcc, buff);
BackgroundColor = buff[idx];
ArrayPool <uint> .Shared.Return(buff);
}
}
var appext = meta.GetValueOrDefault <byte[]>(Wic.Metadata.Gif.AppExtension).AsSpan();
if (appext.Length == 11 && netscape2_0.SequenceEqual(appext) || animexts1_0.SequenceEqual(appext))
{
var appdata = meta.GetValueOrDefault <byte[]>(Wic.Metadata.Gif.AppExtensionData).AsSpan();
if (appdata.Length >= 4 && appdata[0] >= 3 && appdata[1] == 1)
{
LoopCount = BinaryPrimitives.ReadUInt16LittleEndian(appdata.Slice(2));
}
}
}
public static WicImageContainer Create(Stream inStream, WicPipelineContext ctx)
{
var dec = createDecoder(stm => Wic.Factory.CreateDecoderFromStream(stm, null, WICDecodeOptions.WICDecodeMetadataCacheOnDemand), inStream.AsIStream());
return(new WicImageContainer(dec, ctx));
}
public static WicImageContainer Create(string fileName, WicPipelineContext ctx)
{
var dec = createDecoder(fn => Wic.Factory.CreateDecoderFromFilename(fn, null, GenericAccessRights.GENERIC_READ, WICDecodeOptions.WICDecodeMetadataCacheOnDemand), fileName);
return(new WicImageContainer(dec, ctx));
}
