public override void ReadSegment()
{
/** read text region Segment flags */
ReadPatternDictionaryFlags();
width = decoder.Readbyte();
height = decoder.Readbyte();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("pattern dictionary size = " + width + " , " + height);
}
short[] buf = new short[4];
decoder.Readbyte(buf);
grayMax = BinaryOperation.GetInt32(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("grey max = " + grayMax);
}
bool useMMR = patternDictionaryFlags.GetFlagValue(PatternDictionaryFlags.HD_MMR) == 1;
int template = patternDictionaryFlags.GetFlagValue(PatternDictionaryFlags.HD_TEMPLATE);
if (!useMMR)
{
arithmeticDecoder.ResetGenericStats(template, null);
arithmeticDecoder.Start();
}
short[] genericBAdaptiveTemplateX = new short[4], genericBAdaptiveTemplateY = new short[4];
genericBAdaptiveTemplateX[0] = (short)-width;
genericBAdaptiveTemplateY[0] = 0;
genericBAdaptiveTemplateX[1] = -3;
genericBAdaptiveTemplateY[1] = -1;
genericBAdaptiveTemplateX[2] = 2;
genericBAdaptiveTemplateY[2] = -2;
genericBAdaptiveTemplateX[3] = -2;
genericBAdaptiveTemplateY[3] = -2;
size = grayMax + 1;
JBIG2Bitmap bitmap = new JBIG2Bitmap(size * width, height, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.Clear(0);
bitmap.ReadBitmap(useMMR, template, false, false, null, genericBAdaptiveTemplateX, genericBAdaptiveTemplateY, segmentHeader.GetSegmentDataLength() - 7);
JBIG2Bitmap[] bitmaps = new JBIG2Bitmap[size];
int x = 0;
for (int i = 0; i < size; i++)
{
bitmaps[i] = bitmap.GetSlice(x, 0, width, height);
x += width;
}
this.bitmaps = bitmaps;
}
public override void ReadSegment()
{
base.ReadSegment();
/** read text region Segment flags */
ReadHalftoneRegionFlags();
short[] buf = new short[4];
decoder.Readbyte(buf);
int gridWidth = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridHeight = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridX = BinaryOperation.GetInt32(buf);
buf = new short[4];
decoder.Readbyte(buf);
int gridY = BinaryOperation.GetInt32(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("grid pos and size = " + gridX + ',' + gridY + ' ' + gridWidth + ',' + gridHeight);
}
buf = new short[2];
decoder.Readbyte(buf);
int stepX = BinaryOperation.GetInt16(buf);
buf = new short[2];
decoder.Readbyte(buf);
int stepY = BinaryOperation.GetInt16(buf);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("step size = " + stepX + ',' + stepY);
}
int[] referedToSegments = segmentHeader.GetReferredToSegments();
if (referedToSegments.Length != 1)
{
Console.WriteLine("Error in halftone Segment. refSegs should == 1");
}
Segment segment = decoder.FindSegment(referedToSegments[0]);
if (segment.GetSegmentHeader().GetSegmentType() != Segment.PATTERN_DICTIONARY)
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Error in halftone Segment. bad symbol dictionary reference");
}
}
PatternDictionarySegment patternDictionarySegment = (PatternDictionarySegment)segment;
int bitsPerValue = 0, i = 1;
while (i < patternDictionarySegment.GetSize())
{
bitsPerValue++;
i <<= 1;
}
JBIG2Bitmap bitmap = patternDictionarySegment.GetBitmaps()[0];
long patternWidth = bitmap.GetWidth();
long patternHeight = bitmap.GetHeight();
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("pattern size = " + patternWidth + ',' + patternHeight);
}
bool useMMR = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_MMR) != 0;
int template = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_TEMPLATE);
if (!useMMR)
{
arithmeticDecoder.ResetGenericStats(template, null);
arithmeticDecoder.Start();
}
int halftoneDefaultPixel = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_DEF_PIXEL);
bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.Clear(halftoneDefaultPixel);
bool enableSkip = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_ENABLE_SKIP) != 0;
JBIG2Bitmap skipBitmap = null;
if (enableSkip)
{
skipBitmap = new JBIG2Bitmap(gridWidth, gridHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
skipBitmap.Clear(0);
for (int y = 0; y < gridHeight; y++)
{
for (int x = 0; x < gridWidth; x++)
{
int xx = gridX + y * stepY + x * stepX;
int yy = gridY + y * stepX - x * stepY;
if (((xx + patternWidth) >> 8) <= 0 || (xx >> 8) >= regionBitmapWidth || ((yy + patternHeight) >> 8) <= 0 || (yy >> 8) >= regionBitmapHeight)
{
skipBitmap.SetPixel(y, x, 1);
}
}
}
}
int[] grayScaleImage = new int[gridWidth * gridHeight];
short[] genericBAdaptiveTemplateX = new short[4], genericBAdaptiveTemplateY = new short[4];
genericBAdaptiveTemplateX[0] = (short)(template <= 1 ? 3 : 2);
genericBAdaptiveTemplateY[0] = -1;
genericBAdaptiveTemplateX[1] = -3;
genericBAdaptiveTemplateY[1] = -1;
genericBAdaptiveTemplateX[2] = 2;
genericBAdaptiveTemplateY[2] = -2;
genericBAdaptiveTemplateX[3] = -2;
genericBAdaptiveTemplateY[3] = -2;
JBIG2Bitmap grayBitmap;
for (int j = bitsPerValue - 1; j >= 0; --j)
{
grayBitmap = new JBIG2Bitmap(gridWidth, gridHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
grayBitmap.ReadBitmap(useMMR, template, false, enableSkip, skipBitmap, genericBAdaptiveTemplateX, genericBAdaptiveTemplateY, -1);
i = 0;
for (int row = 0; row < gridHeight; row++)
{
for (int col = 0; col < gridWidth; col++)
{
int bit = grayBitmap.GetPixel(col, row) ^ grayScaleImage[i] & 1;
grayScaleImage[i] = (grayScaleImage[i] << 1) | bit;
i++;
}
}
}
int combinationOperator = halftoneRegionFlags.GetFlagValue(HalftoneRegionFlags.H_COMB_OP);
i = 0;
for (int col = 0; col < gridHeight; col++)
{
int xx = gridX + col * stepY;
int yy = gridY + col * stepX;
for (int row = 0; row < gridWidth; row++)
{
if (!(enableSkip && skipBitmap.GetPixel(col, row) == 1))
{
JBIG2Bitmap patternBitmap = patternDictionarySegment.GetBitmaps()[grayScaleImage[i]];
bitmap.Combine(patternBitmap, xx >> 8, yy >> 8, combinationOperator);
}
xx += stepX;
yy -= stepY;
i++;
}
}
if (inlineImage)
{
PageInformationSegment pageSegment = decoder.FindPageSegement(segmentHeader.GetPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.GetPageBitmap();
int externalCombinationOperator = regionFlags.GetFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.Combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, externalCombinationOperator);
}
else
{
bitmap.SetBitmapNumber(GetSegmentHeader().GetSegmentNumber());
decoder.AppendBitmap(bitmap);
}
}
public override void ReadSegment()
{
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("==== Reading Page Information Dictionary ====");
}
short[] buff = new short[4];
decoder.Readbyte(buff);
pageBitmapWidth = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
pageBitmapHeight = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Bitmap size = " + pageBitmapWidth + 'x' + pageBitmapHeight);
}
buff = new short[4];
decoder.Readbyte(buff);
xResolution = BinaryOperation.GetInt32(buff);
buff = new short[4];
decoder.Readbyte(buff);
yResolution = BinaryOperation.GetInt32(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Resolution = " + xResolution + 'x' + yResolution);
}
/** extract page information flags */
short pageInformationFlagsField = decoder.Readbyte();
pageInformationFlags.SetFlags(pageInformationFlagsField);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("symbolDictionaryFlags = " + pageInformationFlagsField);
}
buff = new short[2];
decoder.Readbyte(buff);
pageStriping = BinaryOperation.GetInt16(buff);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("Page Striping = " + pageStriping);
}
int defPix = pageInformationFlags.GetFlagValue(PageInformationFlags.DEFAULT_PIXEL_VALUE);
int height;
if (pageBitmapHeight == -1)
{
height = pageStriping & 0x7fff;
}
else
{
height = pageBitmapHeight;
}
pageBitmap = new JBIG2Bitmap(pageBitmapWidth, height, arithmeticDecoder, huffmanDecoder, mmrDecoder);
pageBitmap.Clear(defPix);
}
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);
}
}