Function color_tree_get

dependency/densecrf/examples/lodepng.cpp:3027–3037

returns -1 if color not present, its index otherwise*/

/*returns -1 if color not present, its index otherwise*/
static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a)
{
    int bit = 0;
    for(bit = 0; bit < 8; ++bit)
    {
        int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1);
        if(!tree->children[i]) return -1;
        else tree = tree->children[i];
    }
    return tree ? tree->index : -1;
}

#ifdef LODEPNG_COMPILE_ENCODER
static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a)