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load fits images to equiv. data type 

so we have better support for bzero / bscale
This commit is contained in:
John Cupitt 2017-01-04 12:27:23 +00:00
parent 3a48ff9cc1
commit a0b8bac8f2
1 changed files with 17 additions and 3 deletions
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20
libvips/foreign/fits.c
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@ -23,6 +23,9 @@
* - redo as a set of fns ready for wrapping in a new-style class
* 23/6/13
* - fix ushort save with values >32k, thanks weaverwb
* 4/1/17
* - load to equivalent data type, not raw image data type ... improves
* support for BSCALE / BZERO settings
*/
/*
@ -119,7 +122,7 @@ typedef struct {
VipsPel *buffer;
} VipsFits;
const char *vips__fits_suffs[] = { ".fits", NULL };
const char *vips__fits_suffs[] = { ".fits", ".fit", NULL };
static void
vips_fits_error( int status )
@ -219,10 +222,21 @@ vips_fits_get_header( VipsFits *fits, VipsImage *out )
return( -1 );
}
/* cfitsio does automatic conversion from the format stored in
* the file to the equivalent type after scale/offset. We need
* to allocate a vips image of the equivalent type, not the original
* type.
*/
if( fits_get_img_equivtype( fits->fptr, &bitpix, &status ) ) {
vips_fits_error( status );
return( -1 );
}
#ifdef VIPS_DEBUG
VIPS_DEBUG_MSG( "naxis = %d\n", fits->naxis );
for( i = 0; i < fits->naxis; i++ )
VIPS_DEBUG_MSG( "%d) %lld\n", i, fits->naxes[i] );
VIPS_DEBUG_MSG( "fits2vips: bitpix = %d\n", bitpix );
#endif /*VIPS_DEBUG*/
height = 1;
@ -266,8 +280,8 @@ vips_fits_get_header( VipsFits *fits, VipsImage *out )
if( fits->band_select != -1 )
bands = 1;
/* Get image format. We want the 'raw' format of the image, our caller
* can convert using the meta info if they want.
/* Get image format. This is the equivalent format, or the format
* stored in the file.
*/
for( i = 0; i < VIPS_NUMBER( fits2vips_formats ); i++ )
if( fits2vips_formats[i][0] == bitpix )