public ImageLines ReadRowsByte(int rowOffset, int nRows, int rowStep)
{
if (nRows < 0)
{
nRows = (ImgInfo.Rows - rowOffset) / rowStep;
}
if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > ImgInfo.Rows)
{
throw new PngjInputException("bad args");
}
ImageLines imlines = new ImageLines(ImgInfo, ImageLine.ESampleType.BYTE, unpackedMode, rowOffset, nRows, rowStep);
if (!interlaced)
{
for (int j = 0; j < ImgInfo.Rows; j++)
{
int bytesread = ReadRowRaw(j); // read and perhaps discards
int mrow = imlines.ImageRowToMatrixRowStrict(j);
if (mrow >= 0)
{
decodeLastReadRowToByte(imlines.ScanlinesB[mrow], bytesread);
}
}
}
else // and now, for something completely different (interlaced)
{
byte[] buf = new byte[unpackedMode ? ImgInfo.SamplesPerRow : ImgInfo.SamplesPerRowPacked];
for (int p = 1; p <= 7; p++)
{
deinterlacer.setPass(p);
for (int i = 0; i < deinterlacer.getRows(); i++)
{
int bytesread = ReadRowRaw(i);
int j = deinterlacer.getCurrRowReal();
int mrow = imlines.ImageRowToMatrixRowStrict(j);
if (mrow >= 0)
{
decodeLastReadRowToByte(buf, bytesread);
deinterlacer.deinterlaceByte(buf, imlines.ScanlinesB[mrow], !unpackedMode);
}
}
}
}
End();
return(imlines);
}
public ImageLines ReadRowsByte(int rowOffset, int nRows, int rowStep)
{
if (nRows < 0)
{
nRows = (ImgInfo.Rows - rowOffset) / rowStep;
}
if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > ImgInfo.Rows)
{
throw new PngjInputException("bad args");
}
ImageLines imageLines = new ImageLines(ImgInfo, ImageLine.ESampleType.BYTE, unpackedMode, rowOffset, nRows, rowStep);
if (!interlaced)
{
for (int i = 0; i < ImgInfo.Rows; i++)
{
int bytesRead = ReadRowRaw(i);
int num = imageLines.ImageRowToMatrixRowStrict(i);
if (num >= 0)
{
decodeLastReadRowToByte(imageLines.ScanlinesB[num], bytesRead);
}
}
}
else
{
byte[] array = new byte[unpackedMode ? ImgInfo.SamplesPerRow : ImgInfo.SamplesPerRowPacked];
for (int j = 1; j <= 7; j++)
{
deinterlacer.setPass(j);
for (int k = 0; k < deinterlacer.getRows(); k++)
{
int bytesRead2 = ReadRowRaw(k);
int currRowReal = deinterlacer.getCurrRowReal();
int num2 = imageLines.ImageRowToMatrixRowStrict(currRowReal);
if (num2 >= 0)
{
decodeLastReadRowToByte(array, bytesRead2);
deinterlacer.deinterlaceByte(array, imageLines.ScanlinesB[num2], !unpackedMode);
}
}
}
}
End();
return(imageLines);
}