Gvl3.c

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#include <grass/gis.h>
#include <grass/G3d.h>
#include <grass/gstypes.h>
#include <grass/glocale.h>

int Gvl_load_colors_data(void **color_data, const char *name)
{
    const char *mapset;
    struct Colors *colors;

    if (NULL == (mapset = G_find_grid3(name, ""))) {
        G_warning(_("3D raster map <%s> not found"), name);
        return (-1);
    }

    if (NULL == (colors = (struct Colors *)G_malloc(sizeof(struct Colors))))
        return (-1);

    if (0 > G3d_readColors(name, mapset, colors)) {
        G_free(colors);
        return (-1);
    }

    *color_data = colors;

    return (1);
}

int Gvl_unload_colors_data(void *color_data)
{
    if (!G_free_colors(color_data))
        return (-1);

    G_free(color_data);

    return (1);
}

int Gvl_get_color_for_value(void *color_data, float *value)
{
    int r, g, b;

    G_get_f_raster_color((FCELL *) value, &r, &g, &b, color_data);
    return ((r & 0xff) | ((g & 0xff) << 8) | ((b & 0xff) << 16));
}