public void ReadSegment()
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== Reading Generic Refinement Region ====");
}
base.ReadSegment();
/** read text region segment flags */
ReadGenericRegionFlags();
short[] genericRegionAdaptiveTemplateX = new short[2];
short[] genericRegionAdaptiveTemplateY = new short[2];
int template = refinementRegionFlags.GetFlagValue(RefinementRegionFlags.GR_TEMPLATE);
if (template == 0)
{
genericRegionAdaptiveTemplateX[0] = ReadATValue();
genericRegionAdaptiveTemplateY[0] = ReadATValue();
genericRegionAdaptiveTemplateX[1] = ReadATValue();
genericRegionAdaptiveTemplateY[1] = ReadATValue();
}
if (noOfReferedToSegments == 0 || inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
if (pageSegment.GetPageBitmapHeight() == -1 && regionBitmapYLocation + regionBitmapHeight > pageBitmap.GetHeight())
{
pageBitmap.Expand(regionBitmapYLocation + regionBitmapHeight, pageSegment.GetPageInformationFlags().GetFlagValue(PageInformationFlags.DEFAULT_PIXEL_VALUE));
}
}
if (noOfReferedToSegments > 1)
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Bad reference in JBIG2 generic refinement Segment");
}
return;
}
JBIG2Bitmap referedToBitmap;
if (noOfReferedToSegments == 1)
{
referedToBitmap = decoder.FindBitmap(referedToSegments[0]);
}
else
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
referedToBitmap = pageBitmap.GetSlice(regionBitmapXLocation, regionBitmapYLocation, regionBitmapWidth, regionBitmapHeight);
}
arithmeticDecoder.ResetRefinementStats(template, null);
arithmeticDecoder.Start();
bool typicalPredictionGenericRefinementOn = refinementRegionFlags.GetFlagValue(RefinementRegionFlags.TPGDON) != 0;
JBIG2Bitmap bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.ReadGenericRefinementRegion(template, typicalPredictionGenericRefinementOn, referedToBitmap, 0, 0, genericRegionAdaptiveTemplateX, genericRegionAdaptiveTemplateY);
if (inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
int extCombOp = regionFlags.GetFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.Combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, extCombOp);
}
else
{
bitmap.SetBitmapNumber(GetSegmentHeader().GetSegmentNumber());
decoder.AppendBitmap(bitmap);
}
}
public override void ReadSegment()
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== Reading Immediate Generic Region ====");
}
base.ReadSegment();
/** read text region Segment flags */
ReadGenericRegionFlags();
bool useMMR = genericRegionFlags.GetFlagValue(GenericRegionFlags.MMR) != 0;
int template = genericRegionFlags.GetFlagValue(GenericRegionFlags.GB_TEMPLATE);
short[] genericBAdaptiveTemplateX = new short[4];
short[] genericBAdaptiveTemplateY = new short[4];
if (!useMMR)
{
if (template == 0)
{
genericBAdaptiveTemplateX[0] = ReadATValue();
genericBAdaptiveTemplateY[0] = ReadATValue();
genericBAdaptiveTemplateX[1] = ReadATValue();
genericBAdaptiveTemplateY[1] = ReadATValue();
genericBAdaptiveTemplateX[2] = ReadATValue();
genericBAdaptiveTemplateY[2] = ReadATValue();
genericBAdaptiveTemplateX[3] = ReadATValue();
genericBAdaptiveTemplateY[3] = ReadATValue();
}
else
{
genericBAdaptiveTemplateX[0] = ReadATValue();
genericBAdaptiveTemplateY[0] = ReadATValue();
}
arithmeticDecoder.ResetGenericStats(template, null);
arithmeticDecoder.Start();
}
bool typicalPredictionGenericDecodingOn = genericRegionFlags.GetFlagValue(GenericRegionFlags.TPGDON) != 0;
int length = segmentHeader.GetSegmentDataLength();
if (length == -1)
{
/**
* length of data is unknown, so it needs to be determined through examination of the data.
* See 7.2.7 - Segment data length of the JBIG2 specification.
*/
unknownLength = true;
short match1;
short match2;
if (useMMR)
{
// look for 0x00 0x00 (0, 0)
match1 = 0;
match2 = 0;
}
else
{
// look for 0xFF 0xAC (255, 172)
match1 = 255;
match2 = 172;
}
int bytesRead = 0;
while (true)
{
short bite1 = decoder.Readbyte();
bytesRead++;
if (bite1 == match1)
{
short bite2 = decoder.Readbyte();
bytesRead++;
if (bite2 == match2)
{
length = bytesRead - 2;
break;
}
}
}
decoder.MovePointer(-bytesRead);
}
JBIG2Bitmap bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.Clear(0);
bitmap.ReadBitmap(useMMR, template, typicalPredictionGenericDecodingOn, false, null, genericBAdaptiveTemplateX, genericBAdaptiveTemplateY, useMMR ? 0 : length - 18);
if (inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
int extCombOp = regionFlags.GetFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
if (pageSegment.GetPageBitmapHeight() == -1 && regionBitmapYLocation + regionBitmapHeight > pageBitmap.GetHeight())
{
pageBitmap.Expand(regionBitmapYLocation + regionBitmapHeight,
pageSegment.GetPageInformationFlags().GetFlagValue(PageInformationFlags.DEFAULT_PIXEL_VALUE));
}
pageBitmap.Combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, extCombOp);
}
else
{
bitmap.SetBitmapNumber(GetSegmentHeader().GetSegmentNumber());
decoder.AppendBitmap(bitmap);
}
if (unknownLength)
{
decoder.MovePointer(4);
}
}