names.go

Documentation: image

		 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
View as plain text