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Quick and temporary hack to decode the thumbnail from the makernote of Olympus TIFF files. A mechanism to cleanly extend the decoder with code like this will be required.

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This commit is contained in:
Andreas Huggel 2006-04-23 15:20:28 +00:00
parent 5b57a1749b
commit ea35e19f51
1 changed files with 19 additions and 0 deletions
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19
src/tiffvisitor.cpp
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@ -158,6 +158,25 @@ namespace Exiv2 {
if (object->group() == Group::ignr) return;
// Experimental code to decode Olympus Thumbnail from the TIFF makernote
// into IFD1.
// Todo: this should go elsewhere. Ideally, such code to decode specific
// tag/group combinations could be added from outside
if (object->tag() == 0x0100 && object->group() == 257) {
const DataValue* v = dynamic_cast<const DataValue*>(object->pValue());
if (v != 0) {
ExifData& exifData = pImage_->exifData();
exifData["Exif.Thumbnail.Compression"] = uint16_t(6);
DataBuf buf(v->size());
v->copy(buf.pData_);
Exifdatum& ed = exifData["Exif.Thumbnail.JPEGInterchangeFormat"];
ed = uint32_t(0);
ed.setDataArea(buf.pData_, buf.size_);
exifData["Exif.Thumbnail.JPEGInterchangeFormatLength"] = uint32_t(buf.size_);
return;
}
}
// Todo: ExifKey should have an appropriate c'tor, it should not be
// necessary to use groupName here
ExifKey k(object->tag(), object->groupName());