bool
TIFFOutput::write_exif_data ()
{
#if defined(TIFF_VERSION_BIG) && TIFFLIB_VERSION >= 20120922
// Older versions of libtiff do not support writing Exif directories
if (m_spec.get_int_attribute ("tiff:write_exif", 1) == 0) {
// The special metadata "tiff:write_exif", if present and set to 0
// (the default is 1), will cause us to skip outputting Exif data.
// This is useful in cases where we think the TIFF file will need to
// be read by an app that links against an old version of libtiff
// that will have trouble reading the Exif directory.
return true;
}
// First, see if we have any Exif data at all
bool any_exif = false;
for (size_t i = 0, e = m_spec.extra_attribs.size(); i < e; ++i) {
const ImageIOParameter &p (m_spec.extra_attribs[i]);
int tag, tifftype, count;
if (exif_tag_lookup (p.name(), tag, tifftype, count) &&
tifftype != TIFF_NOTYPE) {
if (tag == EXIFTAG_SECURITYCLASSIFICATION ||
tag == EXIFTAG_IMAGEHISTORY ||
tag == EXIFTAG_ISOSPEEDRATINGS)
continue; // libtiff doesn't understand these
any_exif = true;
break;
}
}
if (! any_exif)
return true;
if (m_compression == COMPRESSION_JPEG) {
// For reasons we don't understand, JPEG-compressed TIFF seems
// to not output properly without a directory checkpoint here.
TIFFCheckpointDirectory (m_tif);
}
// First, finish writing the current directory
if (! TIFFWriteDirectory (m_tif)) {
error ("failed TIFFWriteDirectory()");
return false;
}
// Create an Exif directory
if (TIFFCreateEXIFDirectory (m_tif) != 0) {
error ("failed TIFFCreateEXIFDirectory()");
return false;
}
for (size_t i = 0, e = m_spec.extra_attribs.size(); i < e; ++i) {
const ImageIOParameter &p (m_spec.extra_attribs[i]);
int tag, tifftype, count;
if (exif_tag_lookup (p.name(), tag, tifftype, count) &&
tifftype != TIFF_NOTYPE) {
if (tag == EXIFTAG_SECURITYCLASSIFICATION ||
tag == EXIFTAG_IMAGEHISTORY ||
tag == EXIFTAG_ISOSPEEDRATINGS)
continue; // libtiff doesn't understand these
bool ok = false;
if (tifftype == TIFF_ASCII) {
ok = TIFFSetField (m_tif, tag, *(char**)p.data());
} else if ((tifftype == TIFF_SHORT || tifftype == TIFF_LONG) &&
p.type() == TypeDesc::SHORT) {
ok = TIFFSetField (m_tif, tag, (int)*(short *)p.data());
} else if ((tifftype == TIFF_SHORT || tifftype == TIFF_LONG) &&
p.type() == TypeDesc::INT) {
ok = TIFFSetField (m_tif, tag, *(int *)p.data());
} else if ((tifftype == TIFF_RATIONAL || tifftype == TIFF_SRATIONAL) &&
p.type() == TypeDesc::FLOAT) {
ok = TIFFSetField (m_tif, tag, *(float *)p.data());
} else if ((tifftype == TIFF_RATIONAL || tifftype == TIFF_SRATIONAL) &&
p.type() == TypeDesc::DOUBLE) {
ok = TIFFSetField (m_tif, tag, *(double *)p.data());
}
if (! ok) {
// std::cout << "Unhandled EXIF " << p.name() << " " << p.type() << "\n";
}
}
}
// Now write the directory of Exif data
uint64 dir_offset = 0;
if (! TIFFWriteCustomDirectory (m_tif, &dir_offset)) {
error ("failed TIFFWriteCustomDirectory() of the Exif data");
return false;
}
// Go back to the first directory, and add the EXIFIFD pointer.
// std::cout << "diffdir = " << tiffdir << "\n";
TIFFSetDirectory (m_tif, 0);
TIFFSetField (m_tif, TIFFTAG_EXIFIFD, dir_offset);
#endif
return true; // all is ok
}
bool
TIFFOutput::write_exif_data ()
{
#if defined(TIFF_VERSION_BIG) && TIFFLIB_VERSION >= 20120922
// Older versions of libtiff do not support writing Exif directories
// First, see if we have any Exif data at all
bool any_exif = false;
for (size_t i = 0, e = m_spec.extra_attribs.size(); i < e; ++i) {
const ImageIOParameter &p (m_spec.extra_attribs[i]);
int tag, tifftype, count;
if (exif_tag_lookup (p.name(), tag, tifftype, count) &&
tifftype != TIFF_NOTYPE) {
if (tag == EXIFTAG_SECURITYCLASSIFICATION ||
tag == EXIFTAG_IMAGEHISTORY ||
tag == EXIFTAG_ISOSPEEDRATINGS)
continue; // libtiff doesn't understand these
any_exif = true;
break;
}
}
if (! any_exif)
return true;
// First, finish writing the current directory
if (! TIFFWriteDirectory (m_tif)) {
error ("failed TIFFWriteDirectory()");
return false;
}
// Create an Exif directory
if (TIFFCreateEXIFDirectory (m_tif) != 0) {
error ("failed TIFFCreateEXIFDirectory()");
return false;
}
for (size_t i = 0, e = m_spec.extra_attribs.size(); i < e; ++i) {
const ImageIOParameter &p (m_spec.extra_attribs[i]);
int tag, tifftype, count;
if (exif_tag_lookup (p.name(), tag, tifftype, count) &&
tifftype != TIFF_NOTYPE) {
if (tag == EXIFTAG_SECURITYCLASSIFICATION ||
tag == EXIFTAG_IMAGEHISTORY ||
tag == EXIFTAG_ISOSPEEDRATINGS)
continue; // libtiff doesn't understand these
bool ok = false;
if (tifftype == TIFF_ASCII) {
ok = TIFFSetField (m_tif, tag, *(char**)p.data());
} else if ((tifftype == TIFF_SHORT || tifftype == TIFF_LONG) &&
p.type() == TypeDesc::SHORT) {
ok = TIFFSetField (m_tif, tag, (int)*(short *)p.data());
} else if ((tifftype == TIFF_SHORT || tifftype == TIFF_LONG) &&
p.type() == TypeDesc::INT) {
ok = TIFFSetField (m_tif, tag, *(int *)p.data());
} else if ((tifftype == TIFF_RATIONAL || tifftype == TIFF_SRATIONAL) &&
p.type() == TypeDesc::FLOAT) {
ok = TIFFSetField (m_tif, tag, *(float *)p.data());
} else if ((tifftype == TIFF_RATIONAL || tifftype == TIFF_SRATIONAL) &&
p.type() == TypeDesc::DOUBLE) {
ok = TIFFSetField (m_tif, tag, *(double *)p.data());
}
if (! ok) {
// std::cout << "Unhandled EXIF " << p.name() << " " << p.type() << "\n";
}
}
}
// Now write the directory of Exif data
uint64 dir_offset = 0;
if (! TIFFWriteCustomDirectory (m_tif, &dir_offset)) {
error ("failed TIFFWriteCustomDirectory() of the Exif data");
return false;
}
// Go back to the first directory, and add the EXIFIFD pointer.
// std::cout << "diffdir = " << tiffdir << "\n";
TIFFSetDirectory (m_tif, 0);
TIFFSetField (m_tif, TIFFTAG_EXIFIFD, dir_offset);
#endif
return true; // all is ok
}
