adjustContrast method

void adjustContrast(
  1. num value
)

Implementation

void adjustContrast(num value) {
  final v = min(max(value, -1), 1) + 1;
  final o = 128 * (1 - v);

  _concat([v, 0, 0, 0, 0, v, 0, 0, 0, 0, v, 0, 0, 0, 0, 1], [o, o, o, 0]);
}