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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package image
import (
var (
// Black is an opaque black uniform image.
Black = NewUniform(color.Black)
// White is an opaque white uniform image.
White = NewUniform(color.White)
// Transparent is a fully transparent uniform image.
Transparent = NewUniform(color.Transparent)
// Opaque is a fully opaque uniform image.
Opaque = NewUniform(color.Opaque)
// Uniform is an infinite-sized Image of uniform color.
// It implements the color.Color, color.Model, and Image interfaces.
type Uniform struct {
C color.Color
func (c *Uniform) RGBA() (r, g, b, a uint32) {
return c.C.RGBA()
func (c *Uniform) ColorModel() color.Model {
return c
func (c *Uniform) Convert(color.Color) color.Color {
return c.C
func (c *Uniform) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
func (c *Uniform) At(x, y int) color.Color { return c.C }
// Opaque scans the entire image and reports whether it is fully opaque.
func (c *Uniform) Opaque() bool {
_, _, _, a := c.C.RGBA()
return a == 0xffff
func NewUniform(c color.Color) *Uniform {
return &Uniform{c}