rt_band_duplicate()

rt_band rt_band_duplicate

(

rt_band

band

)

Create a new band duplicated from source band.

Memory is allocated for band path (if band is offline) or band data (if band is online). The caller is responsible for freeing the memory when the returned rt_band is destroyed.

Parameters

the band to duplicate

Returns

an rt_band or NULL on failure

Memory is allocated for band path (if band is offline) or band data (if band is online). The caller is responsible for freeing the memory when the returned rt_band is destroyed.

Parameters

the band to copy

Returns

an rt_band or NULL on failure

Definition at line 186 of file rt_band.c.

References ovdump::data, rt_band_t::data, rt_band_t::hasnodata, rt_band_t::height, rt_band_t::mem, rt_band_t::nodataval, rt_band_t::offline, rt_band_t::pixtype, rt_band_new_inline(), rt_band_new_offline(), rt_band_set_ownsdata_flag(), rt_pixtype_size(), rtalloc(), rterror(), and rt_band_t::width.

Referenced by rt_raster_copy_band().

                                {
        rt_band rtn = NULL;

        assert(band != NULL);

        /* offline */
        if (band->offline) {
                rtn = rt_band_new_offline(
                        band->width, band->height,
                        band->pixtype,
                        band->hasnodata, band->nodataval,
                        band->data.offline.bandNum, (const char *) band->data.offline.path
                );
        }
        /* online */
        else {
                uint8_t *data = NULL;
                data = rtalloc(rt_pixtype_size(band->pixtype) * band->width * band->height);
                if (data == NULL) {
                        rterror("rt_band_duplicate: Out of memory allocating online band data");
                        return NULL;
                }
                memcpy(data, band->data.mem, rt_pixtype_size(band->pixtype) * band->width * band->height);

                rtn = rt_band_new_inline(
                        band->width, band->height,
                        band->pixtype,
                        band->hasnodata, band->nodataval,
                        data
                );
                rt_band_set_ownsdata_flag(rtn, 1); /* we DO own this data!!! */
        }

        if (rtn == NULL) {
                rterror("rt_band_duplicate: Could not copy band");
                return NULL;
        }

        return rtn;
}

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