internal void QuantizeAndInverseAllComponents()
{
for (int i = 0; i < this.components.Components.Length; i++)
{
PdfJsFrameComponent frameComponent = this.Frame.Components[i];
PdfJsComponent component = this.components.Components[i];
this.QuantizeAndInverseComponentData(component, frameComponent);
}
}
/// <summary>
/// Parses the input stream for file markers
/// </summary>
/// <param name="metaData">Contains the metadata for an image</param>
/// <param name="metadataOnly">Whether to decode metadata only.</param>
private void ParseStream(ImageMetaData metaData, bool metadataOnly)
{
// TODO: metadata only logic
// Check for the Start Of Image marker.
var fileMarker = new PdfJsFileMarker(this.ReadUint16(), 0);
if (fileMarker.Marker != PdfJsJpegConstants.Markers.SOI)
{
throw new ImageFormatException("Missing SOI marker.");
}
ushort marker = this.ReadUint16();
fileMarker = new PdfJsFileMarker(marker, (int)this.InputStream.Position - 2);
this.quantizationTables = new PdfJsQuantizationTables();
this.dcHuffmanTables = new PdfJsHuffmanTables();
this.acHuffmanTables = new PdfJsHuffmanTables();
while (fileMarker.Marker != PdfJsJpegConstants.Markers.EOI)
{
// Get the marker length
int remaining = this.ReadUint16() - 2;
switch (fileMarker.Marker)
{
case PdfJsJpegConstants.Markers.APP0:
this.ProcessApplicationHeaderMarker(remaining);
break;
case PdfJsJpegConstants.Markers.APP1:
this.ProcessApp1Marker(remaining, metaData);
break;
case PdfJsJpegConstants.Markers.APP2:
this.ProcessApp2Marker(remaining, metaData);
break;
case PdfJsJpegConstants.Markers.APP3:
case PdfJsJpegConstants.Markers.APP4:
case PdfJsJpegConstants.Markers.APP5:
case PdfJsJpegConstants.Markers.APP6:
case PdfJsJpegConstants.Markers.APP7:
case PdfJsJpegConstants.Markers.APP8:
case PdfJsJpegConstants.Markers.APP9:
case PdfJsJpegConstants.Markers.APP10:
case PdfJsJpegConstants.Markers.APP11:
case PdfJsJpegConstants.Markers.APP12:
case PdfJsJpegConstants.Markers.APP13:
this.InputStream.Skip(remaining);
break;
case PdfJsJpegConstants.Markers.APP14:
this.ProcessApp14Marker(remaining);
break;
case PdfJsJpegConstants.Markers.APP15:
case PdfJsJpegConstants.Markers.COM:
this.InputStream.Skip(remaining);
break;
case PdfJsJpegConstants.Markers.DQT:
this.ProcessDefineQuantizationTablesMarker(remaining);
break;
case PdfJsJpegConstants.Markers.SOF0:
case PdfJsJpegConstants.Markers.SOF1:
case PdfJsJpegConstants.Markers.SOF2:
this.ProcessStartOfFrameMarker(remaining, fileMarker);
break;
case PdfJsJpegConstants.Markers.DHT:
this.ProcessDefineHuffmanTablesMarker(remaining);
break;
case PdfJsJpegConstants.Markers.DRI:
this.ProcessDefineRestartIntervalMarker(remaining);
break;
case PdfJsJpegConstants.Markers.SOS:
this.ProcessStartOfScanMarker();
break;
}
// Read on.
fileMarker = FindNextFileMarker(this.markerBuffer, this.InputStream);
}
this.ImageWidth = this.Frame.SamplesPerLine;
this.ImageHeight = this.Frame.Scanlines;
this.components = new PdfJsComponentBlocks {
Components = new PdfJsComponent[this.Frame.ComponentCount]
};
for (int i = 0; i < this.components.Components.Length; i++)
{
PdfJsFrameComponent frameComponent = this.Frame.Components[i];
var component = new PdfJsComponent
{
Scale = new System.Numerics.Vector2(
frameComponent.HorizontalSamplingFactor / (float)this.Frame.MaxHorizontalFactor,
frameComponent.VerticalSamplingFactor / (float)this.Frame.MaxVerticalFactor),
BlocksPerLine = frameComponent.WidthInBlocks,
BlocksPerColumn = frameComponent.HeightInBlocks
};
// this.QuantizeAndInverseComponentData(ref component, frameComponent);
this.components.Components[i] = component;
}
this.NumberOfComponents = this.components.Components.Length;
}
private static int GetBlockBufferOffset(ref PdfJsComponent component, int row, int col)
{
return(64 * (((component.BlocksPerLine + 1) * row) + col));
}
