private WicColorProfile matchProfile(ReadOnlySpan <IntPtr> profiles, PixelFormat fmt)
{
var buff = (Span <byte>) stackalloc byte[8];
foreach (var pcc in profiles)
{
var cc = (IWICColorContext *)pcc;
var cct = default(WICColorContextType);
HRESULT.Check(cc->GetType(&cct));
if (cct == WICColorContextType.WICColorContextProfile)
{
uint cb;
HRESULT.Check(cc->GetProfileBytes(0, null, &cb));
// Don't try to read giant profiles. 4MiB should be enough, and more might indicate corrupt metadata.
if (cb > 1024 * 1024 * 4)
{
continue;
}
var cpi = WicColorProfile.GetProfileFromContext(cc, cb);
if (cpi.IsValid && cpi.IsCompatibleWith(fmt))
{
return(new WicColorProfile(new ComPtr <IWICColorContext>(cc), cpi, true));
}
}
else if (cct == WICColorContextType.WICColorContextExifColorSpace && WicMetadataReader is not null)
{
// Although WIC defines the non-standard AdobeRGB ExifColorSpace value, most software (including Adobe's) only supports the Uncalibrated/InteropIndex=R03 convention.
// http://ninedegreesbelow.com/photography/embedded-color-space-information.html
uint ecs;
HRESULT.Check(cc->GetExifColorSpace(&ecs));
if (ecs == (uint)ExifColorSpace.AdobeRGB)
{
return(WicColorProfile.AdobeRgb.Value);
}
if (ecs == (uint)ExifColorSpace.Uncalibrated)
{
var r03 = (ReadOnlySpan <byte>)(new[] { (byte)'R', (byte)'0', (byte)'3' });
var meta = ComPtr <IWICMetadataQueryReader> .Wrap(WicMetadataReader);
if (meta.GetValueOrDefault(Container.ContainerFormat == FileFormat.Jpeg ? Wic.Metadata.InteropIndexJpeg : Wic.Metadata.InteropIndexExif, buff).SequenceEqual(r03))
{
return(WicColorProfile.AdobeRgb.Value);
}
}
}
}
return(WicColorProfile.GetDefaultFor(fmt));
}
private void moveToFrame(int index)
{
ctx.Settings.FrameIndex = index;
ctx.ImageFrame.Dispose();
ctx.ImageFrame = ctx.ImageContainer.GetFrame(index);
if (ctx.ImageFrame is WicImageFrame wicFrame)
{
ctx.Source = ComPtr <IWICBitmapSource> .Wrap(wicFrame.WicSource).AsPixelSource(null, nameof(IWICBitmapFrameDecode), false);
}
else
{
ctx.Source = ctx.ImageFrame.PixelSource.AsPixelSource();
}
MagicTransforms.AddGifFrameBuffer(ctx, false);
if (lastSource is ChainedPixelSource chain && chain.Passthrough)
{
chain.ReInit(ctx.Source);
ctx.Source = chain;
}
}