genproto: Index | Files

package color

import ""


Package Files



var File_google_type_color_proto protoreflect.FileDescriptor

type Color Uses

type Color struct {

    // The amount of red in the color as a value in the interval [0, 1].
    Red float32 `protobuf:"fixed32,1,opt,name=red,proto3" json:"red,omitempty"`
    // The amount of green in the color as a value in the interval [0, 1].
    Green float32 `protobuf:"fixed32,2,opt,name=green,proto3" json:"green,omitempty"`
    // The amount of blue in the color as a value in the interval [0, 1].
    Blue float32 `protobuf:"fixed32,3,opt,name=blue,proto3" json:"blue,omitempty"`
    // The fraction of this color that should be applied to the pixel. That is,
    // the final pixel color is defined by the equation:
    //   pixel color = alpha * (this color) + (1.0 - alpha) * (background color)
    // This means that a value of 1.0 corresponds to a solid color, whereas
    // a value of 0.0 corresponds to a completely transparent color. This
    // uses a wrapper message rather than a simple float scalar so that it is
    // possible to distinguish between a default value and the value being unset.
    // If omitted, this color object is to be rendered as a solid color
    // (as if the alpha value had been explicitly given with a value of 1.0).
    Alpha *wrapperspb.FloatValue `protobuf:"bytes,4,opt,name=alpha,proto3" json:"alpha,omitempty"`
    // contains filtered or unexported fields

Represents a color in the RGBA color space. This representation is designed for simplicity of conversion to/from color representations in various languages over compactness; for example, the fields of this representation can be trivially provided to the constructor of "java.awt.Color" in Java; it can also be trivially provided to UIColor's "+colorWithRed:green:blue:alpha" method in iOS; and, with just a little work, it can be easily formatted into a CSS "rgba()" string in JavaScript, as well.

Note: this proto does not carry information about the absolute color space that should be used to interpret the RGB value (e.g. sRGB, Adobe RGB, DCI-P3, BT.2020, etc.). By default, applications SHOULD assume the sRGB color space.

Note: when color equality needs to be decided, implementations, unless documented otherwise, will treat two colors to be equal if all their red, green, blue and alpha values each differ by at most 1e-5.

Example (Java):


// ...
public static java.awt.Color fromProto(Color protocolor) {
  float alpha = protocolor.hasAlpha()
      ? protocolor.getAlpha().getValue()
      : 1.0;

  return new java.awt.Color(

public static Color toProto(java.awt.Color color) {
  float red = (float) color.getRed();
  float green = (float) color.getGreen();
  float blue = (float) color.getBlue();
  float denominator = 255.0;
  Color.Builder resultBuilder =
          .setRed(red / denominator)
          .setGreen(green / denominator)
          .setBlue(blue / denominator);
  int alpha = color.getAlpha();
  if (alpha != 255) {
            .setValue(((float) alpha) / denominator)
// ...

Example (iOS / Obj-C):

    // ...
    static UIColor* fromProto(Color* protocolor) {
       float red = [protocolor red];
       float green = [protocolor green];
       float blue = [protocolor blue];
       FloatValue* alpha_wrapper = [protocolor alpha];
       float alpha = 1.0;
       if (alpha_wrapper != nil) {
         alpha = [alpha_wrapper value];
       return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];

    static Color* toProto(UIColor* color) {
        CGFloat red, green, blue, alpha;
        if (![color getRed:&red green:&green blue:&blue alpha:&alpha]) {
          return nil;
        Color* result = [[Color alloc] init];
        [result setRed:red];
        [result setGreen:green];
        [result setBlue:blue];
        if (alpha <= 0.9999) {
          [result setAlpha:floatWrapperWithValue(alpha)];
        [result autorelease];
        return result;
   // ...

Example (JavaScript):

   // ...

   var protoToCssColor = function(rgb_color) {
      var redFrac = || 0.0;
      var greenFrac = || 0.0;
      var blueFrac = || 0.0;
      var red = Math.floor(redFrac * 255);
      var green = Math.floor(greenFrac * 255);
      var blue = Math.floor(blueFrac * 255);

      if (!('alpha' in rgb_color)) {
         return rgbToCssColor_(red, green, blue);

      var alphaFrac = rgb_color.alpha.value || 0.0;
      var rgbParams = [red, green, blue].join(',');
      return ['rgba(', rgbParams, ',', alphaFrac, ')'].join('');

   var rgbToCssColor_ = function(red, green, blue) {
     var rgbNumber = new Number((red << 16) | (green << 8) | blue);
     var hexString = rgbNumber.toString(16);
     var missingZeros = 6 - hexString.length;
     var resultBuilder = ['#'];
     for (var i = 0; i < missingZeros; i++) {
     return resultBuilder.join('');

   // ...

func (*Color) Descriptor Uses

func (*Color) Descriptor() ([]byte, []int)

Deprecated: Use Color.ProtoReflect.Descriptor instead.

func (*Color) GetAlpha Uses

func (x *Color) GetAlpha() *wrapperspb.FloatValue

func (*Color) GetBlue Uses

func (x *Color) GetBlue() float32

func (*Color) GetGreen Uses

func (x *Color) GetGreen() float32

func (*Color) GetRed Uses

func (x *Color) GetRed() float32

func (*Color) ProtoMessage Uses

func (*Color) ProtoMessage()

func (*Color) ProtoReflect Uses

func (x *Color) ProtoReflect() protoreflect.Message

func (*Color) Reset Uses

func (x *Color) Reset()

func (*Color) String Uses

func (x *Color) String() string

Package color imports 6 packages (graph) and is imported by 11 packages. Updated 2020-10-26. Refresh now. Tools for package owners.