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-rw-r--r--src/image/names.go58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/image/names.go b/src/image/names.go
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+++ b/src/image/names.go
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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.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 }
+
+func (c *Uniform) RGBA64At(x, y int) color.RGBA64 {
+ r, g, b, a := c.C.RGBA()
+ return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)}
+}
+
+// Opaque scans the entire image and reports whether it is fully opaque.
+func (c *Uniform) Opaque() bool {
+ _, _, _, a := c.C.RGBA()
+ return a == 0xffff
+}
+
+// NewUniform returns a new Uniform image of the given color.
+func NewUniform(c color.Color) *Uniform {
+ return &Uniform{c}
+}