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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 (

        "image/color"

)

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.ColorModel, 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 returns whether or not 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}

}