public PlanarPipelineContext(PixelSource sourceY, PixelSource sourceCb, PixelSource sourceCr)
{
if (sourceY.Format.FormatGuid != Consts.GUID_WICPixelFormat8bppY)
{
throw new ArgumentException("Invalid pixel format", nameof(sourceY));
}
if (sourceCb.Format.FormatGuid != Consts.GUID_WICPixelFormat8bppCb)
{
throw new ArgumentException("Invalid pixel format", nameof(sourceCb));
}
if (sourceCr.Format.FormatGuid != Consts.GUID_WICPixelFormat8bppCr)
{
throw new ArgumentException("Invalid pixel format", nameof(sourceCr));
}
SourceY = sourceY;
SourceCb = sourceCb;
SourceCr = sourceCr;
ChromaSubsampling =
sourceCb.Width < sourceY.Width && sourceCb.Height < sourceY.Height ? ChromaSubsampleMode.Subsample420 :
sourceCb.Width < sourceY.Width ? ChromaSubsampleMode.Subsample422 :
sourceCb.Height < sourceY.Height ? ChromaSubsampleMode.Subsample440 :
ChromaSubsampleMode.Subsample444;
}
public static void AddPlanarHighQualityScaler(PipelineContext ctx, ChromaSubsampleMode subsample)
{
Debug.Assert(ctx.PlanarContext is not null);
AddHighQualityScaler(ctx);
ctx.PlanarContext.SourceY = ctx.Source;
ctx.Source = ctx.PlanarContext.SourceCb;
if (subsample.IsSubsampledX())
{
ctx.Settings.InnerSize.Width = MathUtil.DivCeiling(ctx.Settings.InnerSize.Width, 2);
}
if (subsample.IsSubsampledY())
{
ctx.Settings.InnerSize.Height = MathUtil.DivCeiling(ctx.Settings.InnerSize.Height, 2);
}
AddHighQualityScaler(ctx);
ctx.PlanarContext.SourceCb = ctx.Source;
ctx.Source = ctx.PlanarContext.SourceCr;
AddHighQualityScaler(ctx);
ctx.PlanarContext.SourceCr = ctx.Source;
ctx.Source = ctx.PlanarContext.SourceY;
}
public static bool IsSubsampledY(this ChromaSubsampleMode o) => IsSubsampledY((WICJpegYCrCbSubsamplingOption)o);
public static bool IsSubsampledY(this ChromaSubsampleMode o) => o == ChromaSubsampleMode.Subsample420 || o == ChromaSubsampleMode.Subsample440;