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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}
}