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Source file src/image/names.go

Documentation: image

  // 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}
  }
  

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