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/****************************************************************************
* NCSA HDF *
* Scientific Data Technologies *
* National Center for Supercomputing Applications *
* University of Illinois at Urbana-Champaign *
* 605 E. Springfield, Champaign IL 61820 *
* *
* For conditions of distribution and use, see the accompanying *
* hdf/COPYING file. *
* *
****************************************************************************/
#include "H5IMpalette.h"
#include "H5Iprivate.h"
#include "H5Pprivate.h"
/*local operator function */
static herr_t find_palette( hid_t UNUSED loc_id, const char *name, void *op_data);
/*private function */
herr_t H5IM_find_palette( hid_t loc_id );
/*-------------------------------------------------------------------------
* Function: H5IMattach_palette
*
* Purpose: This function attaches a palette to an existing image dataset
*
* Return: Success: 0, Failure: -1
*
* Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
*
* Date: May 01, 2001
*
* Comments:
* based on HDF5 Image and Palette Specification
* http://hdf.ncsa.uiuc.edu/HDF5/H5Image/ImageSpec.html
*
* An image (dataset) within an HDF5 file may optionally specify an array of
* palettes to be viewed with. The dataset will have an attribute
* which contains an array of object reference pointers which refer to palettes in the file.
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t H5IMattach_palette( hid_t loc_id,
const char *image_name,
const char *pal_name,
const hsize_t *pal_dims,
hid_t plist_id,
const void *pal_data )
{
hid_t image_id;
hid_t attr_type;
hid_t attr_id;
hid_t attr_space_id;
herr_t status;
hid_t attr_class;
hobj_ref_t ref; /* write a new reference */
hobj_ref_t *refbuf; /* buffer to read references */
hssize_t n_refs;
hsize_t dim_ref;
int ok_pal;
const H5IM_paletteinfo_t *info;
/* First we get some information about the palette */
/* Default palette */
if ( plist_id == H5IM_STDPALETTE )
{
info = &H5IM_create_dfltpalette;
}
/* User defined palette */
else
{
/* Check valid plist, get it */
if ( H5P_get_class(plist_id) != H5P_PALETTE ||
NULL == ( info = H5I_object(plist_id)))
{
return FAIL;
}
}
/* First we create the palette dataset and attach to it the required attributes
* that identify it as a palette
*/
/* Make the palette dataset. The palette is created on the same local id. */
status = H5Lmake_dataset( loc_id, pal_name, 2, pal_dims, H5T_NATIVE_UCHAR, H5T_NATIVE_UCHAR, pal_data );
/* Attach the attribute "CLASS" to the >>palette<< dataset*/
status = H5Lattach_attribute( loc_id, pal_name, "CLASS", "PALETTE" );
/* Attach the attribute "PAL_VERSION" to the >>palette<< dataset*/
status = H5Lattach_attribute( loc_id, pal_name, "PAL_VERSION", "1.2" );
/* Attach the attribute "PAL_COLORMODEL" to the >>palette<< dataset*/
status = H5Lattach_attribute( loc_id, pal_name, "PAL_COLORMODEL", info->color_model );
/* Attach the attribute "PAL_TYPE" to the >>palette<< dataset*/
status = H5Lattach_attribute( loc_id, pal_name, "PAL_TYPE", info->type );
/* Attach the PAL_MINMAXNUMERIC attribute */
status = H5Lattach_attribute_numerical( loc_id, pal_name, "PAL_MINMAXNUMERIC", 2, H5T_NATIVE_INT, (void*)&info->minmax );
/* The image dataset may or not have the attribute "PALETTE"
* First we try to open to see if it is already there; if not, it is created.
* If it exists, the array of references is extended to hold the reference
* to the new palette
*/
/* First wet the image id */
image_id = H5Dopen( loc_id, image_name );
/* Try to find the attribute "PALETTE" on the >>image<< dataset */
ok_pal = H5IM_find_palette( image_id );
/* It does not exist. We create the attribute and one reference */
if ( ok_pal <= 0 )
{
attr_space_id = H5Screate( H5S_SCALAR );
/* Create the attribute type for the reference */
attr_type = H5Tcopy( H5T_STD_REF_OBJ );
/* Create the attribute "PALETTE" to be attached to the image*/
attr_id = H5Acreate( image_id, "PALETTE", attr_type, attr_space_id, H5P_DEFAULT );
/* Create a reference. The reference is created on the local id. */
status = H5Rcreate( &ref, loc_id, pal_name, H5R_OBJECT, -1 );
/* Write the attribute with the reference */
status = H5Awrite( attr_id, attr_type, &ref );
status = H5Sclose( attr_space_id );
}
/* The attribute already exists, open it */
else if ( ok_pal == 1 )
{
attr_id = H5Aopen_name( image_id, "PALETTE" );
attr_type = H5Aget_type( attr_id );
attr_class = H5Tget_class( attr_type );
/* Check if it is really a reference */
if ( attr_class == H5T_REFERENCE )
{
/* Get and save the old reference(s) */
attr_space_id = H5Aget_space( attr_id );
n_refs = H5Sget_simple_extent_npoints( attr_space_id );
dim_ref = n_refs + 1;
refbuf = malloc( sizeof(hobj_ref_t) * (int)dim_ref );
status = H5Aread( attr_id, attr_type, refbuf );
status = H5Sclose( attr_space_id );
/* The attribute must be deleted, in order to the new one can reflect the changes*/
status = H5Adelete( image_id, "PALETTE" );
/* Create a new reference for this palette. */
status = H5Rcreate( &ref, loc_id, pal_name, H5R_OBJECT, -1 );
refbuf[n_refs] = ref;
/* Create the data space for the new references */
attr_space_id = H5Screate_simple( 1, &dim_ref, NULL );
/* Create the attribute again with the changes of space */
attr_id = H5Acreate( image_id, "PALETTE", attr_type, attr_space_id, H5P_DEFAULT );
/* Write the attribute with the new references */
status = H5Awrite( attr_id, attr_type, refbuf );
status = H5Sclose( attr_space_id );
free( refbuf );
} /* H5T_REFERENCE */
status = H5Tclose( attr_type );
/* Close the attribute. */
status = H5Aclose( attr_id );
}
/* Close the image dataset. */
status = H5Dclose( image_id );
return status;
}
/*-------------------------------------------------------------------------
* Function: find_palette
*
* Purpose: operator function used by H5L_find_palette
*
* Return:
*
* Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
*
* Date: May 28, 2001
*
* Comments:
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t find_palette( hid_t UNUSED loc_id, const char *name, void *op_data)
{
/* Define a default zero value for return. This will cause the iterator to continue if
* the palette attribute is not found yet.
*/
int ret = 0;
/* Define a positive value for return value if the attribute was found. This will
* cause the iterator to immediately return that positive value,
* indicating short-circuit success
*/
if( HDstrcmp( name, "PALETTE" ) == 0 )
ret = 1;
return ret;
}
/*-------------------------------------------------------------------------
* Function: H5IM_find_palette
*
* Purpose: Find the atrribute "PALETTE" in the image dataset
*
* Return: Success: 1, Failure: 0
*
* Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
*
* Date: May 11, 2001
*
* Comments:
* The function uses H5Aiterate with the operator function find_palette
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t H5IM_find_palette( hid_t loc_id )
{
unsigned int attr_num; /* Starting attribute to look up */
herr_t ret;
attr_num = 0;
ret = H5Aiterate( loc_id, &attr_num, find_palette, 0 );
return ret;
}
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