names.mx raw

   1  // Copyright 2010 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  package image
   6  
   7  import (
   8  	"image/color"
   9  )
  10  
  11  var (
  12  	// Black is an opaque black uniform image.
  13  	Black = NewUniform(color.Black)
  14  	// White is an opaque white uniform image.
  15  	White = NewUniform(color.White)
  16  	// Transparent is a fully transparent uniform image.
  17  	Transparent = NewUniform(color.Transparent)
  18  	// Opaque is a fully opaque uniform image.
  19  	Opaque = NewUniform(color.Opaque)
  20  )
  21  
  22  // Uniform is an infinite-sized [Image] of uniform color.
  23  // It implements the [color.Color], [color.Model], and [Image] interfaces.
  24  type Uniform struct {
  25  	C color.Color
  26  }
  27  
  28  func (c *Uniform) RGBA() (r, g, b, a uint32) {
  29  	return c.C.RGBA()
  30  }
  31  
  32  func (c *Uniform) ColorModel() color.Model {
  33  	return c
  34  }
  35  
  36  func (c *Uniform) Convert(color.Color) color.Color {
  37  	return c.C
  38  }
  39  
  40  func (c *Uniform) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} }
  41  
  42  func (c *Uniform) At(x, y int) color.Color { return c.C }
  43  
  44  func (c *Uniform) RGBA64At(x, y int) color.RGBA64 {
  45  	r, g, b, a := c.C.RGBA()
  46  	return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)}
  47  }
  48  
  49  // Opaque scans the entire image and reports whether it is fully opaque.
  50  func (c *Uniform) Opaque() bool {
  51  	_, _, _, a := c.C.RGBA()
  52  	return a == 0xffff
  53  }
  54  
  55  // NewUniform returns a new [Uniform] image of the given color.
  56  func NewUniform(c color.Color) *Uniform {
  57  	return &Uniform{c}
  58  }
  59