// Seek to a random row+sample in a file.
static bool TIFFSeek(TIFF tif, byte[] buf, uint row, ushort sample)
{
TIFFDirectory td=tif.tif_dir;
if(row>=td.td_imagelength)
{ // out of range
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Row out of range, max {1}", row, td.td_imagelength);
return false;
}
uint strip;
if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
{
if(sample>=td.td_samplesperpixel)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Sample out of range, max {1}", sample, td.td_samplesperpixel);
return false;
}
strip=sample*td.td_stripsperimage+row/td.td_rowsperstrip;
}
else strip=row/td.td_rowsperstrip;
if(strip!=tif.tif_curstrip)
{ // different strip, refill
if(!TIFFFillStrip(tif, strip)) return false;
}
else if(row<tif.tif_row)
{
// Moving backwards within the same strip: backup
// to the start and then decode forward (below).
//
// NB: If you're planning on lots of random access within a
// strip, it's better to just read and decode the entire
// strip, and then access the decoded data in a random fashion.
if(!TIFFStartStrip(tif, strip)) return false;
}
if(row!=tif.tif_row)
{
// Seek forward to the desired row.
if(!tif.tif_seek(tif, row-tif.tif_row))
{
// if not directly seeked to, then the slow way... line by line
for(; tif.tif_row<row; tif.tif_row++)
tif.tif_decoderow(tif, buf, (int)tif.tif_scanlinesize, sample);
}
tif.tif_row=row;
}
return true;
}
const uint NOTILE = 0xffffffff; // undefined state
// Seek to a random row+sample in a file.
static bool TIFFSeek(TIFF tif, byte[] buf, uint row, ushort sample)
{
TIFFDirectory td = tif.tif_dir;
if (row >= td.td_imagelength)
{ // out of range
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Row out of range, max {1}", row, td.td_imagelength);
return(false);
}
uint strip;
if (td.td_planarconfig == PLANARCONFIG.SEPARATE)
{
if (sample >= td.td_samplesperpixel)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Sample out of range, max {1}", sample, td.td_samplesperpixel);
return(false);
}
strip = sample * td.td_stripsperimage + row / td.td_rowsperstrip;
}
else
{
strip = row / td.td_rowsperstrip;
}
if (strip != tif.tif_curstrip)
{ // different strip, refill
if (!TIFFFillStrip(tif, strip))
{
return(false);
}
}
else if (row < tif.tif_row)
{
// Moving backwards within the same strip: backup
// to the start and then decode forward (below).
//
// NB: If you're planning on lots of random access within a
// strip, it's better to just read and decode the entire
// strip, and then access the decoded data in a random fashion.
if (!TIFFStartStrip(tif, strip))
{
return(false);
}
}
if (row != tif.tif_row)
{
// Seek forward to the desired row.
if (!tif.tif_seek(tif, row - tif.tif_row))
{
// if not directly seeked to, then the slow way... line by line
for (; tif.tif_row < row; tif.tif_row++)
{
tif.tif_decoderow(tif, buf, (int)tif.tif_scanlinesize, sample);
}
}
tif.tif_row = row;
}
return(true);
}
public static int TIFFWriteScanline(TIFF tif, byte[] buf, uint row, ushort sample)
{
string module="TIFFWriteScanline";
if(!((tif.tif_flags&TIF_FLAGS.TIFF_BEENWRITING)!=0||TIFFWriteCheck(tif, false, module))) return -1;
// Handle delayed allocation of data buffer. This
// permits it to be sized more intelligently (using
// directory information).
if(!BUFFERCHECK(tif)) return -1;
TIFFDirectory td=tif.tif_dir;
bool imagegrew=false;
// Extend image length if needed
// (but only for PlanarConfig=1).
if(row>=td.td_imagelength)
{ // extend image
if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "Can not change \"ImageLength\" when using separate planes");
return -1;
}
td.td_imagelength=row+1;
imagegrew=true;
}
// Calculate strip and check for crossings.
uint strip;
if(td.td_planarconfig==PLANARCONFIG.SEPARATE)
{
if(sample>=td.td_samplesperpixel)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Sample out of range, max {1}", sample, td.td_samplesperpixel);
return -1;
}
strip=sample*td.td_stripsperimage+row/td.td_rowsperstrip;
}
else strip=row/td.td_rowsperstrip;
// Check strip array to make sure there's space. We don't support
// dynamically growing files that have data organized in separate
// bitplanes because it's too painful. In that case we require that
// the imagelength be set properly before the first write (so that the
// strips array will be fully allocated above).
if(strip>=td.td_nstrips&&!TIFFGrowStrips(tif, 1, module)) return -1;
if(strip!=tif.tif_curstrip)
{
// Changing strips -- flush any data present.
if(!TIFFFlushData(tif)) return -1;
tif.tif_curstrip=strip;
// Watch out for a growing image. The value of strips/image
// will initially be 1 (since it can't be deduced until the
// imagelength is known).
if(strip>=td.td_stripsperimage&&imagegrew) td.td_stripsperimage=TIFFhowmany(td.td_imagelength, td.td_rowsperstrip);
tif.tif_row=(strip%td.td_stripsperimage)*td.td_rowsperstrip;
if((tif.tif_flags&TIF_FLAGS.TIFF_CODERSETUP)==0)
{
if(!tif.tif_setupencode(tif)) return -1;
tif.tif_flags|=TIF_FLAGS.TIFF_CODERSETUP;
}
tif.tif_rawcc=0;
tif.tif_rawcp=0;
if(td.td_stripbytecount[strip]>0)
{
// Force TIFFAppendToStrip() to consider placing data at end of file.
tif.tif_curoff=0;
}
if(!tif.tif_preencode(tif, sample)) return -1;
tif.tif_flags|=TIF_FLAGS.TIFF_POSTENCODE;
}
// Ensure the write is either sequential or at the
// beginning of a strip (or that we can randomly
// access the data -- i.e. no encoding).
if(row!=tif.tif_row)
{
if(row<tif.tif_row)
{
// Moving backwards within the same strip:
// backup to the start and then decode
// forward (below).
tif.tif_row=(strip%td.td_stripsperimage)*td.td_rowsperstrip;
tif.tif_rawcp=0;
}
// Seek forward to the desired row.
if(!tif.tif_seek(tif, row-tif.tif_row)) return -1;
tif.tif_row=row;
}
// swab if needed - note that source buffer will be altered
tif.tif_postdecode(tif, buf, 0, (int)tif.tif_scanlinesize);
bool status=tif.tif_encoderow(tif, buf, (int)tif.tif_scanlinesize, sample);
// we are now poised at the beginning of the next row
tif.tif_row=row+1;
return status?1:0;
}
public static int TIFFWriteScanline(TIFF tif, byte[] buf, uint row, ushort sample)
{
string module = "TIFFWriteScanline";
if (!((tif.tif_flags & TIF_FLAGS.TIFF_BEENWRITING) != 0 || TIFFWriteCheck(tif, false, module)))
{
return(-1);
}
// Handle delayed allocation of data buffer. This
// permits it to be sized more intelligently (using
// directory information).
if (!BUFFERCHECK(tif))
{
return(-1);
}
TIFFDirectory td = tif.tif_dir;
bool imagegrew = false;
// Extend image length if needed
// (but only for PlanarConfig=1).
if (row >= td.td_imagelength)
{ // extend image
if (td.td_planarconfig == PLANARCONFIG.SEPARATE)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "Can not change \"ImageLength\" when using separate planes");
return(-1);
}
td.td_imagelength = row + 1;
imagegrew = true;
}
// Calculate strip and check for crossings.
uint strip;
if (td.td_planarconfig == PLANARCONFIG.SEPARATE)
{
if (sample >= td.td_samplesperpixel)
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "{0}: Sample out of range, max {1}", sample, td.td_samplesperpixel);
return(-1);
}
strip = sample * td.td_stripsperimage + row / td.td_rowsperstrip;
}
else
{
strip = row / td.td_rowsperstrip;
}
// Check strip array to make sure there's space. We don't support
// dynamically growing files that have data organized in separate
// bitplanes because it's too painful. In that case we require that
// the imagelength be set properly before the first write (so that the
// strips array will be fully allocated above).
if (strip >= td.td_nstrips && !TIFFGrowStrips(tif, 1, module))
{
return(-1);
}
if (strip != tif.tif_curstrip)
{
// Changing strips -- flush any data present.
if (!TIFFFlushData(tif))
{
return(-1);
}
tif.tif_curstrip = strip;
// Watch out for a growing image. The value of strips/image
// will initially be 1 (since it can't be deduced until the
// imagelength is known).
if (strip >= td.td_stripsperimage && imagegrew)
{
td.td_stripsperimage = TIFFhowmany(td.td_imagelength, td.td_rowsperstrip);
}
tif.tif_row = (strip % td.td_stripsperimage) * td.td_rowsperstrip;
if ((tif.tif_flags & TIF_FLAGS.TIFF_CODERSETUP) == 0)
{
if (!tif.tif_setupencode(tif))
{
return(-1);
}
tif.tif_flags |= TIF_FLAGS.TIFF_CODERSETUP;
}
tif.tif_rawcc = 0;
tif.tif_rawcp = 0;
if (td.td_stripbytecount[strip] > 0)
{
// Force TIFFAppendToStrip() to consider placing data at end of file.
tif.tif_curoff = 0;
}
if (!tif.tif_preencode(tif, sample))
{
return(-1);
}
tif.tif_flags |= TIF_FLAGS.TIFF_POSTENCODE;
}
// Ensure the write is either sequential or at the
// beginning of a strip (or that we can randomly
// access the data -- i.e. no encoding).
if (row != tif.tif_row)
{
if (row < tif.tif_row)
{
// Moving backwards within the same strip:
// backup to the start and then decode
// forward (below).
tif.tif_row = (strip % td.td_stripsperimage) * td.td_rowsperstrip;
tif.tif_rawcp = 0;
}
// Seek forward to the desired row.
if (!tif.tif_seek(tif, row - tif.tif_row))
{
return(-1);
}
tif.tif_row = row;
}
// swab if needed - note that source buffer will be altered
tif.tif_postdecode(tif, buf, 0, (int)tif.tif_scanlinesize);
bool status = tif.tif_encoderow(tif, buf, (int)tif.tif_scanlinesize, sample);
// we are now poised at the beginning of the next row
tif.tif_row = row + 1;
return(status?1:0);
}