fix(labels): font color

[blaryjp]

Hello,

When we put a dark color, the font color is still dark, so we're unable to see what is written.

Possible solutions:

• add a white shadow to the font
• add the possibility to set the font color
• add the possibility to use a "dark/light" dropdown to define the font color
• ?

Thx

[yesnault]

    self.getBrightness = function(rgb) {
      var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(rgb);
      return result ?
        0.2126 * parseInt(result[1], 16) +
        0.7152 * parseInt(result[2], 16) +
        0.0722 * parseInt(result[3], 16) : 0;
    };

    self.getBrightnessColor = function(rgb) {
      if (self.getBrightness(rgb) > 130) {
        return '#000000';
      }
      return '#ffffff';
    };

(from https://github.com/ovh/tatwebui/blob/master/client/src/app/shared/message-label/message-label.component.js#L58 )

[blaryjp]

@bnjjj up ; still annoying.. ; thx!