53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package image
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import (
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"image/color"
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)
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var (
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// Black is an opaque black uniform image.
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Black = NewUniform(color.Black)
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// White is an opaque white uniform image.
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White = NewUniform(color.White)
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// Transparent is a fully transparent uniform image.
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Transparent = NewUniform(color.Transparent)
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// Opaque is a fully opaque uniform image.
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Opaque = NewUniform(color.Opaque)
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)
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// Uniform is an infinite-sized Image of uniform color.
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// It implements the color.Color, color.Model, and Image interfaces.
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type Uniform struct {
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C color.Color
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}
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func (c *Uniform) RGBA() (r, g, b, a uint32) {
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return c.C.RGBA()
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}
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func (c *Uniform) ColorModel() color.Model {
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return c
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}
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func (c *Uniform) Convert(color.Color) color.Color {
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return c.C
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}
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func (c *Uniform) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
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func (c *Uniform) At(x, y int) color.Color { return c.C }
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// Opaque scans the entire image and returns whether or not it is fully opaque.
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func (c *Uniform) Opaque() bool {
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_, _, _, a := c.C.RGBA()
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return a == 0xffff
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}
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func NewUniform(c color.Color) *Uniform {
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return &Uniform{c}
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}
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