getColorIndexRgb method
Implementation
@override
int getColorIndexRgb(int r, int g, int b) {
_OctreeNode? root = _root;
for (var bit = 1 << 7; bit != 0; bit >>= 1) {
final i = ((g & bit) != 0 ? 1 : 0) * 4 +
((r & bit) != 0 ? 1 : 0) * 2 +
((b & bit) != 0 ? 1 : 0);
if (root!.children[i] == null) {
break;
}
root = root.children[i];
}
return root?.paletteIndex ?? 0;
}