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#include <grass/gis.h>
#include <grass/raster.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 is_zero_value(void *rast, RASTER_MAP_TYPE data_type)
{
/* insert 0 check here */
return Rast_is_null_value(rast, data_type) ||
Rast_get_d_value(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, size_t out_cell_size, int use_zero,
int no_support)
{
int more;
more = 0;
while (ncols-- > 0) {
if (use_zero) { /* use 0 for transparency instead of NULL */
if (is_zero_value(result, out_type) ||
Rast_is_null_value(result, out_type)) {
/* Don't patch hole with a null, just mark as more */
if (Rast_is_null_value(patch, out_type))
more = 1;
else {
/* Mark that there is more to be done if we patch with 0 */
if (is_zero_value(patch, out_type))
more = 1;
Rast_raster_cpy(result, patch, 1, out_type);
if (out_type == CELL_TYPE && !no_support)
Rast_update_cell_stats((CELL *)result, 1, statf);
}
} /* ZERO support */
}
else { /* use NULL for transparency instead of 0 */
if (Rast_is_null_value(result, out_type)) {
if (Rast_is_null_value(patch, out_type))
more = 1;
else {
Rast_raster_cpy(result, patch, 1, out_type);
if (out_type == CELL_TYPE && !no_support)
Rast_update_cell_stats((CELL *)result, 1, statf);
}
} /* NULL support */
}
result = G_incr_void_ptr(result, out_cell_size);
patch = G_incr_void_ptr(patch, out_cell_size);
}
return more;
}
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