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December 2003
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2003.12.26 02:02 "Re: Reading and writing out TIFFTAG_CLIPPATH", by Jae Ho Lee
Hi,
I want to let you that I solved this problem with a minor change to
libtiff.
My problem was that I was looking for ClipPath(343) tag which was not
part of sample tiff I was working with.
Sample tiff contained TIFFTAG_PHOTOSHOP(34377).
So, instead of trying to fetch clippath and write it out, I opted to
fetch whole photoshop data and write it out.
But I still could not write PHOTOSHOP tag data to newly created tiff
image until I made below changes to
TIFFWriteNormalTag() fuction in tif_dirwrite.c file.
Thanks for the feedbacks and help.
Regards,
Jae Ho
// jaeho - 20031224
// moved TIFF_BYTE case statement to TIFF_UNDEFINED because
TIFFTAG_PHOTOSHOP tag couldn't be written.
// when tag is TIFFTAG_PHOTOSHOP, 1) is executed but returned
value for wc is zero
// and no data is written for TIFFTAG_PHOTOSHOP tag.
// 2) should be executed to write TIFFTAG_PHOTOSHOP data
correctly but I opted to execute 3) instead.
// case TIFF_BYTE:
case TIFF_SBYTE:
if (wc > 1) {
char* cp;
if (wc == (u_short) TIFF_VARIABLE
|| fip->field_passcount) {
TIFFGetField(tif, fip->field_tag, &wc, &cp); // 1) when tag is
TIFFTAG_PHOTOSHOP; wc = 0
dir->tdir_count = wc;
} else if (wc == (u_short) TIFF_VARIABLE2) {
TIFFGetField(tif, fip->field_tag, &wc2, &cp); // 2) when tag is
TIFFTAG_PHOTOSHOP
dir->tdir_count = wc2;
} else
TIFFGetField(tif, fip->field_tag, &cp);
if (!TIFFWriteByteArray(tif, dir, cp))
return (0);
} else {
if (fip->field_passcount) {
char* cp;
TIFFGetField(tif, fip->field_tag, &wc, &cp);
dir->tdir_count = wc;
if (!TIFFWriteByteArray(tif, dir, cp))
return 0;
} else {
char cv;
TIFFGetField(tif, fip->field_tag, &cv);
if (!TIFFWriteByteArray(tif, dir, &cv))
return (0);
}
}
break;
// jaeho - 20031224
// added TIFF_BYTE to support TIFFTAG_PHOTOSHOP
case TIFF_BYTE:
case TIFF_UNDEFINED:
{ char* cp;
if (wc == (u_short) TIFF_VARIABLE) {
TIFFGetField(tif, fip->field_tag, &wc, &cp);
dir->tdir_count = wc;
} else if (wc == (u_short) TIFF_VARIABLE2) {
TIFFGetField(tif, fip->field_tag, &wc2, &cp); // 3) when tag is
TIFFTAG_PHOTOSHOP
dir->tdir_count = wc2;
} else
TIFFGetField(tif, fip->field_tag, &cp);
if (!TIFFWriteByteArray(tif, dir, cp))
return (0);
}
break;
case TIFF_NOTYPE:
break;
}