rt_band_check_is_nodata()

int rt_band_check_is_nodata

(

rt_band

band

)

Returns TRUE if the band is only nodata values.

Parameters

band	: the band to get info from

Returns

TRUE if the band is only nodata values, FALSE otherwise

Definition at line 1619 of file rt_band.c.

References ES_NONE, FALSE, rt_band_t::hasnodata, rt_band_t::height, rt_band_t::isnodata, rt_band_t::nodataval, RASTER_DEBUG, rt_band_get_pixel(), rterror(), TRUE, and rt_band_t::width.

Referenced by convert_raster(), RASTER_bandIsNoData(), RASTER_setBandNoDataValue(), test_band_metadata(), and test_raster_to_gdal().

                                      {
        int i, j, err;
        double pxValue;
        int isnodata = 0;

        assert(NULL != band);

        /* Check if band has nodata value */
        if (!band->hasnodata) {
                RASTER_DEBUG(3, "Band has no NODATA value");
                band->isnodata = FALSE;
                return FALSE;
        }

        pxValue = band->nodataval;

        /* Check all pixels */
        for (i = 0; i < band->width; i++) {
                for (j = 0; j < band->height; j++) {
                        err = rt_band_get_pixel(band, i, j, &pxValue, &isnodata);
                        if (err != ES_NONE) {
                                rterror("rt_band_check_is_nodata: Cannot get band pixel");
                                return FALSE;
                        }
                        else if (!isnodata) {
                                band->isnodata = FALSE;
                                return FALSE;
                        }
                }
        }

        band->isnodata = TRUE;
        return TRUE;
}

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