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apps: common: dng_writer: Workaround for "Unknown tag 33421" error

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In libtiff version 4.5.1 and later the CFA* tags were missing. This got
fixed in 49856998c3
Unfortunately the fix is not released yet, but the faulty libtiff is
contained in current buildroot. As a local fix is pretty easy and
without side effects, let's workaround that.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Stefan Klug 2024-06-25 09:49:56 +02:00
parent fc3efe0723
commit 36a4f67a75
1 changed files with 17 additions and 0 deletions
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17
src/apps/common/dng_writer.cpp
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@ -526,6 +526,23 @@ int DNGWriter::write(const char *filename, const Camera *camera,
TIFFWriteDirectory(tif);
/*
* Workaround for a bug introduced in libtiff version 4.5.1 and no fix
* released. In these versions the CFA* tags were missing in the field
* info.
* Introduced by: https://gitlab.com/libtiff/libtiff/-/commit/738e04099b13192bb1f654e74e9b5829313f3161
* Fixed by: https://gitlab.com/libtiff/libtiff/-/commit/49856998c3d82e65444b47bb4fb11b7830a0c2be
*/
if (!TIFFFindField(tif, TIFFTAG_CFAREPEATPATTERNDIM, TIFF_ANY)) {
static const TIFFFieldInfo infos[] = {
{ TIFFTAG_CFAREPEATPATTERNDIM, 2, 2, TIFF_SHORT, FIELD_CUSTOM,
1, 0, const_cast<char *>("CFARepeatPatternDim") },
{ TIFFTAG_CFAPATTERN, -1, -1, TIFF_BYTE, FIELD_CUSTOM,
1, 1, const_cast<char *>("CFAPattern") },
};
TIFFMergeFieldInfo(tif, infos, 2);
}
/* Create a new IFD for the RAW image. */
const uint16_t cfaRepeatPatternDim[] = { 2, 2 };
const uint8_t cfaPlaneColor[] = {