isColorLight static method

bool isColorLight(
  1. Color color
)

判断是否为亮色

Implementation

static bool isColorLight(Color color) {
  num r = color.red / 255.0;
  num g = color.green / 255.0;
  num b = color.blue / 255.0;

  if (r <= 0.03928) {
    r /= 12.92;
  } else {
    r = pow((r + 0.055) / 1.055, 2.4);
  }

  if (g <= 0.03928) {
    g /= 12.92;
  } else {
    g = pow((g + 0.055) / 1.055, 2.4);
  }

  if (b <= 0.03928) {
    b /= 12.92;
  } else {
    b = pow((b + 0.055) / 1.055, 2.4);
  }

  final luminance = 0.2126 * r + 0.7152 * g + 0.0722 * b;
  return luminance >
      0.179; // 根据WCAG 2.0 Level AA标准，对比度阈值大约为4.5:1，对应的亮度阈值约为0.179
}