static int
PredictorSetupEncode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
return (0);
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->pfunc = horDiff8; break;
case 16: sp->pfunc = horDiff16; break;
}
/*
* Override default encoding method with
* one that does the predictor stuff.
*/
sp->coderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->codestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->codetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
return (1);
}
static int
PredictorSetupDecode(TIFF* tif) {
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif)) {
return (0);
}
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8:
sp->pfunc = horAcc8;
break;
case 16:
sp->pfunc = horAcc16;
break;
}
/*
* Override default decoding method with
* one that does the predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* If the data is horizontally differenced
* 16-bit data that requires byte-swapping,
* then it must be byte swapped before the
* accumulation step. We do this with a
* special-purpose routine and override the
* normal post decoding logic that the library
* setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->pfunc == horAcc16) {
sp->pfunc = swabHorAcc16;
tif->tif_postdecode = _TIFFNoPostDecode;
} /* else handle 32-bit case... */
}
}
return (1);
}
static int
PredictorSetupDecode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
return 0;
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->pfunc = horAcc8; break;
case 16: sp->pfunc = horAcc16; break;
}
/*
* Override default decoding method with one that does the
* predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* If the data is horizontally differenced 16-bit data that
* requires byte-swapping, then it must be byte swapped before
* the accumulation step. We do this with a special-purpose
* routine and override the normal post decoding logic that
* the library setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->pfunc == horAcc16) {
sp->pfunc = swabHorAcc16;
tif->tif_postdecode = _TIFFNoPostDecode;
} /* else handle 32-bit case... */
}
}
else if (sp->predictor == 3) {
sp->pfunc = fpAcc;
/*
* Override default decoding method with one that does the
* predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* The data should not be swapped outside of the floating
* point predictor, the accumulation routine should return
* byres in the native order.
*/
if (tif->tif_flags & TIFF_SWAB) {
tif->tif_postdecode = _TIFFNoPostDecode;
}
/*
* Allocate buffer to keep the decoded bytes before
* rearranging in the ight order
*/
}
return 1;
}
static int
PredictorSetupEncode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
return 0;
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->encodepfunc = horDiff8; break;
case 16: sp->encodepfunc = horDiff16; break;
case 32: sp->encodepfunc = horDiff32; break;
}
/*
* Override default encoding method with one that does the
* predictor stuff.
*/
if( tif->tif_encoderow != PredictorEncodeRow )
{
sp->encoderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->encodestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->encodetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
/*
* If the data is horizontally differenced 16-bit data that
* requires byte-swapping, then it must be byte swapped after
* the differentiation step. We do this with a special-purpose
* routine and override the normal post decoding logic that
* the library setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->encodepfunc == horDiff16) {
sp->encodepfunc = swabHorDiff16;
tif->tif_postdecode = _TIFFNoPostDecode;
} else if (sp->encodepfunc == horDiff32) {
sp->encodepfunc = swabHorDiff32;
tif->tif_postdecode = _TIFFNoPostDecode;
}
}
}
else if (sp->predictor == 3) {
sp->encodepfunc = fpDiff;
/*
* Override default encoding method with one that does the
* predictor stuff.
*/
if( tif->tif_encoderow != PredictorEncodeRow )
{
sp->encoderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->encodestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->encodetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
}
return 1;
}