get_row_colr.c

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#include <grass/gis.h>
#include "G.h"


int
G_get_raster_row_colors(int fd, int row, struct Colors *colors,
                        unsigned char *red, unsigned char *grn,
                        unsigned char *blu, unsigned char *nul)
{
    static void *array;
    static int array_size;
    static unsigned char *set;
    static int set_size;

    int cols = G__.window.cols;
    int type = G__.fileinfo[fd].map_type;
    int size = G_raster_size(type);
    void *p;
    int i;

    if (array_size < cols * size) {
        array_size = cols * size;
        array = (DCELL *) G_realloc(array, array_size);
    }

    if (set_size < cols) {
        set_size = cols;
        set = G_realloc(set, set_size);
    }

    if (G_get_raster_row(fd, array, row, type) < 0)
        return -1;

    if (nul)
        for (i = 0, p = array; i < cols; i++, p = G_incr_void_ptr(p, size))
            nul[i] = G_is_null_value(p, type);

    G_lookup_raster_colors(array, red, grn, blu, set, cols, colors, type);

    return 0;
}