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Source file src/image/image_test.go

Documentation: image

  // Copyright 2011 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"
  	"testing"
  )
  
  type image interface {
  	Image
  	Opaque() bool
  	Set(int, int, color.Color)
  	SubImage(Rectangle) Image
  }
  
  func cmp(cm color.Model, c0, c1 color.Color) bool {
  	r0, g0, b0, a0 := cm.Convert(c0).RGBA()
  	r1, g1, b1, a1 := cm.Convert(c1).RGBA()
  	return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
  }
  
  func TestImage(t *testing.T) {
  	testImage := []image{
  		NewRGBA(Rect(0, 0, 10, 10)),
  		NewRGBA64(Rect(0, 0, 10, 10)),
  		NewNRGBA(Rect(0, 0, 10, 10)),
  		NewNRGBA64(Rect(0, 0, 10, 10)),
  		NewAlpha(Rect(0, 0, 10, 10)),
  		NewAlpha16(Rect(0, 0, 10, 10)),
  		NewGray(Rect(0, 0, 10, 10)),
  		NewGray16(Rect(0, 0, 10, 10)),
  		NewPaletted(Rect(0, 0, 10, 10), color.Palette{
  			Transparent,
  			Opaque,
  		}),
  	}
  	for _, m := range testImage {
  		if !Rect(0, 0, 10, 10).Eq(m.Bounds()) {
  			t.Errorf("%T: want bounds %v, got %v", m, Rect(0, 0, 10, 10), m.Bounds())
  			continue
  		}
  		if !cmp(m.ColorModel(), Transparent, m.At(6, 3)) {
  			t.Errorf("%T: at (6, 3), want a zero color, got %v", m, m.At(6, 3))
  			continue
  		}
  		m.Set(6, 3, Opaque)
  		if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) {
  			t.Errorf("%T: at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
  			continue
  		}
  		if !m.SubImage(Rect(6, 3, 7, 4)).(image).Opaque() {
  			t.Errorf("%T: at (6, 3) was not opaque", m)
  			continue
  		}
  		m = m.SubImage(Rect(3, 2, 9, 8)).(image)
  		if !Rect(3, 2, 9, 8).Eq(m.Bounds()) {
  			t.Errorf("%T: sub-image want bounds %v, got %v", m, Rect(3, 2, 9, 8), m.Bounds())
  			continue
  		}
  		if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) {
  			t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
  			continue
  		}
  		if !cmp(m.ColorModel(), Transparent, m.At(3, 3)) {
  			t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", m, m.At(3, 3))
  			continue
  		}
  		m.Set(3, 3, Opaque)
  		if !cmp(m.ColorModel(), Opaque, m.At(3, 3)) {
  			t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", m, m.At(3, 3))
  			continue
  		}
  		// Test that taking an empty sub-image starting at a corner does not panic.
  		m.SubImage(Rect(0, 0, 0, 0))
  		m.SubImage(Rect(10, 0, 10, 0))
  		m.SubImage(Rect(0, 10, 0, 10))
  		m.SubImage(Rect(10, 10, 10, 10))
  	}
  }
  
  func Test16BitsPerColorChannel(t *testing.T) {
  	testColorModel := []color.Model{
  		color.RGBA64Model,
  		color.NRGBA64Model,
  		color.Alpha16Model,
  		color.Gray16Model,
  	}
  	for _, cm := range testColorModel {
  		c := cm.Convert(color.RGBA64{0x1234, 0x1234, 0x1234, 0x1234}) // Premultiplied alpha.
  		r, _, _, _ := c.RGBA()
  		if r != 0x1234 {
  			t.Errorf("%T: want red value 0x%04x got 0x%04x", c, 0x1234, r)
  			continue
  		}
  	}
  	testImage := []image{
  		NewRGBA64(Rect(0, 0, 10, 10)),
  		NewNRGBA64(Rect(0, 0, 10, 10)),
  		NewAlpha16(Rect(0, 0, 10, 10)),
  		NewGray16(Rect(0, 0, 10, 10)),
  	}
  	for _, m := range testImage {
  		m.Set(1, 2, color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}) // Non-premultiplied alpha.
  		r, _, _, _ := m.At(1, 2).RGBA()
  		if r != 0x1357 {
  			t.Errorf("%T: want red value 0x%04x got 0x%04x", m, 0x1357, r)
  			continue
  		}
  	}
  }
  

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