1 files changed, 52 insertions, 0 deletions
diff --git a/src/image/names.go b/src/image/names.go
new file mode 100644
index 000000000..8985f4921
--- /dev/null
+++ b/src/image/names.go
@@ -0,0 +1,52 @@
+// 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.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}
+}