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fix TIFFReadScanline() call 

We were passing in 0 instead of -1, which could trigger an assert in
libtiff with some logluv images.

Also, fix logluv decode. We were not always resetting the decode format.
This commit is contained in:
John Cupitt 2020-06-21 12:17:05 +01:00
parent c0daa8ffd2
commit e129dfc27a
1 changed files with 31 additions and 29 deletions
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60
libvips/foreign/tiff2vips.c
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@ -605,7 +605,7 @@ rtiff_strip_read( Rtiff *rtiff, int strip, tdata_t buf )
if( rtiff->header.read_scanlinewise )
length = TIFFReadScanline( rtiff->tiff,
buf, strip, (tsize_t) -1 );
buf, strip, (tsample_t) 0 );
else
length = TIFFReadEncodedStrip( rtiff->tiff,
strip, buf, (tsize_t) -1 );
@ -619,6 +619,25 @@ rtiff_strip_read( Rtiff *rtiff, int strip, tdata_t buf )
return( 0 );
}
/* We need to hint to libtiff what format we'd like pixels in.
*/
static void
rtiff_set_decode_format( Rtiff *rtiff )
{
/* Ask for YCbCr->RGB for jpg data.
*/
if( rtiff->header.compression == COMPRESSION_JPEG )
TIFFSetField( rtiff->tiff,
TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB );
/* Ask for SGI LOGLUV as 3xfloat.
*/
if( rtiff->header.photometric_interpretation ==
PHOTOMETRIC_LOGLUV )
TIFFSetField( rtiff->tiff,
TIFFTAG_SGILOGDATAFMT, SGILOGDATAFMT_FLOAT );
}
static int
rtiff_set_page( Rtiff *rtiff, int page )
{
@ -665,12 +684,10 @@ rtiff_set_page( Rtiff *rtiff, int page )
rtiff->current_page = page;
/* This can get unset when we change directories. Make sure
* it's set again.
/* These can get unset when we change directories. Make sure
* they are set again.
*/
if( rtiff->header.compression == COMPRESSION_JPEG )
TIFFSetField( rtiff->tiff,
TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB );
rtiff_set_decode_format( rtiff );
}
return( 0 );
@ -1601,21 +1618,10 @@ rtiff_set_header( Rtiff *rtiff, VipsImage *out )
uint32 data_length;
void *data;
/* Request YCbCr expansion. libtiff complains if you do this for
* non-jpg images.
*/
if( rtiff->header.compression == COMPRESSION_JPEG )
TIFFSetField( rtiff->tiff,
TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB );
/* Ask for LOGLUV as 3 x float XYZ.
*/
if( rtiff->header.photometric_interpretation == PHOTOMETRIC_LOGLUV ) {
TIFFSetField( rtiff->tiff,
TIFFTAG_SGILOGDATAFMT, SGILOGDATAFMT_FLOAT );
rtiff_set_decode_format( rtiff );
if( rtiff->header.photometric_interpretation == PHOTOMETRIC_LOGLUV )
vips_image_set_double( out, "stonits", rtiff->header.stonits );
}
out->Xsize = rtiff->header.width;
out->Ysize = rtiff->header.height * rtiff->n;
@ -2371,14 +2377,16 @@ rtiff_header_read( Rtiff *rtiff, RtiffHeader *header )
TIFFGetFieldDefaulted( rtiff->tiff,
TIFFTAG_COMPRESSION, &header->compression );
/* We must set this here since it'll change the value of scanline_size.
*/
rtiff_set_decode_format( rtiff );
/* Request YCbCr expansion. libtiff complains if you do this for
* non-jpg images. We must set this here since it changes the result
* of scanline_size.
*/
if( header->compression == COMPRESSION_JPEG )
TIFFSetField( rtiff->tiff,
TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB );
else if( header->photometric_interpretation == PHOTOMETRIC_YCBCR ) {
if( header->compression != COMPRESSION_JPEG &&
header->photometric_interpretation == PHOTOMETRIC_YCBCR ) {
/* We rely on the jpg decompressor to upsample chroma
* subsampled images. If there is chroma subsampling but
* no jpg compression, we have to give up.
@ -2404,12 +2412,6 @@ rtiff_header_read( Rtiff *rtiff, RtiffHeader *header )
"%s", _( "not SGI-compressed LOGLUV" ) );
return( -1 );
}
/* Always get LOGLUV as 3 x float XYZ. We must set this here
* since it'll change the value of scanline_size.
*/
TIFFSetField( rtiff->tiff,
TIFFTAG_SGILOGDATAFMT, SGILOGDATAFMT_FLOAT );
}
/* For logluv, the calibration factor to get to absolute luminance.