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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
// Colors from the HTML 4.01 specification: http://www.w3.org/TR/REC-html40/types.html#h-6.5
// These names do not necessarily match those from other lists, such as the X11 color names.
var (
Aqua = ColorImage{RGBAColor{0x00, 0xff, 0xff, 0xff}}
Black = ColorImage{RGBAColor{0x00, 0x00, 0x00, 0xff}}
Blue = ColorImage{RGBAColor{0x00, 0x00, 0xff, 0xff}}
Fuchsia = ColorImage{RGBAColor{0xff, 0x00, 0xff, 0xff}}
Gray = ColorImage{RGBAColor{0x80, 0x80, 0x80, 0xff}}
Green = ColorImage{RGBAColor{0x00, 0x80, 0x00, 0xff}}
Lime = ColorImage{RGBAColor{0x00, 0xff, 0x00, 0xff}}
Maroon = ColorImage{RGBAColor{0x80, 0x00, 0x00, 0xff}}
Navy = ColorImage{RGBAColor{0x00, 0x00, 0x80, 0xff}}
Olive = ColorImage{RGBAColor{0x80, 0x80, 0x00, 0xff}}
Red = ColorImage{RGBAColor{0xff, 0x00, 0x00, 0xff}}
Purple = ColorImage{RGBAColor{0x80, 0x00, 0x80, 0xff}}
Silver = ColorImage{RGBAColor{0xc0, 0xc0, 0xc0, 0xff}}
Teal = ColorImage{RGBAColor{0x00, 0x80, 0x80, 0xff}}
White = ColorImage{RGBAColor{0xff, 0xff, 0xff, 0xff}}
Yellow = ColorImage{RGBAColor{0xff, 0xff, 0x00, 0xff}}
// These synonyms are not in HTML 4.01.
Cyan = Aqua
Magenta = Fuchsia
)
// A ColorImage is a practically infinite-sized Image of uniform Color.
// It implements both the Color and Image interfaces.
type ColorImage struct {
C Color
}
func (c ColorImage) RGBA() (r, g, b, a uint32) {
return c.C.RGBA()
}
func (c ColorImage) ColorModel() ColorModel {
return ColorModelFunc(func(Color) Color { return c.C })
}
func (c ColorImage) Width() int { return 1e9 }
func (c ColorImage) Height() int { return 1e9 }
func (c ColorImage) At(x, y int) Color { return c.C }
// Opaque scans the entire image and returns whether or not it is fully opaque.
func (c ColorImage) Opaque() bool {
_, _, _, a := c.C.RGBA()
return a == 0xffff
}
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