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#include "gis.h"
/*
* patch in non-zero data over zero data
* keep track of the categories which are patched in
* for later use in constructing the new category and color files
*
* returns: 1 the result still contains nulls
* 0 the result contains no zero nulls
*/
int G_is_zero_value(
void *rast,
RASTER_MAP_TYPE data_type)
{
/* insert 0 check here */
return G_is_null_value(rast, data_type) ||
G_get_raster_value_d(rast, data_type) != 0.0 ? 0 : 1;
}
int do_patch (
void *result,void *patch,
struct Cell_stats *statf,int ncols,
RASTER_MAP_TYPE out_type,
int ZEROFLAG)
{
int more;
more = 0;
while (ncols-- > 0)
{
if (ZEROFLAG) /* use 0 for transparency instead of NULL */
{
if (G_is_zero_value(result, out_type) ||
G_is_null_value(result, out_type))
{
if(G_is_zero_value(patch, out_type) ||
G_is_null_value(patch, out_type))
more = 1;
else
{
G_raster_cpy(result, patch, 1, out_type);
if(out_type==CELL_TYPE)
G_update_cell_stats ((CELL *) result, 1, statf);
}
} /* ZERO support */
}
else /* use NULL for transparency instead of 0 */
{
if (G_is_null_value(result, out_type))
{
if(G_is_null_value(patch, out_type))
more = 1;
else
{
G_raster_cpy(result, patch, 1, out_type);
if(out_type==CELL_TYPE)
G_update_cell_stats ((CELL *) result, 1, statf);
}
} /* NULL support */
}
result = G_incr_void_ptr(result, G_raster_size(out_type));
patch = G_incr_void_ptr(patch, G_raster_size(out_type));
}
return more;
}
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