icns

Easily create .icns files (Mac Icons) with this Go library or the included CLI.
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iconset_test.go (1369B)

      1 package main
      2 
      3 import (
      4 	"image"
      5 	"image/color"
      6 	"testing"
      7 
      8 	"github.com/jackmordaunt/icns/v4"
      9 )
     10 
     11 func solid(side int, c color.NRGBA) *image.NRGBA {
     12 	img := image.NewNRGBA(image.Rect(0, 0, side, side))
     13 	for i := 0; i < len(img.Pix); i += 4 {
     14 		img.Pix[i], img.Pix[i+1], img.Pix[i+2], img.Pix[i+3] = c.R, c.G, c.B, c.A
     15 	}
     16 	return img
     17 }
     18 
     19 // TestPixelSizes covers the slots that land on the same number of pixels,
     20 // where only one drawing can be kept.
     21 func TestPixelSizes(t *testing.T) {
     22 	t.Parallel()
     23 	var (
     24 		plain  = color.NRGBA{R: 0xFF, A: 0xFF}
     25 		retina = color.NRGBA{B: 0xFF, A: 0xFF}
     26 	)
     27 	images := map[icns.Slot]image.Image{
     28 		{Points: 16, Scale: 1}:  solid(16, plain),
     29 		{Points: 16, Scale: 2}:  solid(32, retina),
     30 		{Points: 32, Scale: 1}:  solid(32, plain),
     31 		{Points: 512, Scale: 2}: solid(1024, retina),
     32 	}
     33 	got := pixelSizes(images)
     34 	if len(got) != 3 {
     35 		t.Fatalf("mapped to %d sizes, want 3", len(got))
     36 	}
     37 	for size, want := range map[uint]color.NRGBA{16: plain, 32: plain, 1024: retina} {
     38 		img, ok := got[size]
     39 		if !ok {
     40 			t.Errorf("no drawing at %d pixels", size)
     41 			continue
     42 		}
     43 		if img.Bounds().Dx() != int(size) {
     44 			t.Errorf("the drawing at %d pixels is %d wide", size, img.Bounds().Dx())
     45 		}
     46 		if c := color.NRGBAModel.Convert(img.At(0, 0)).(color.NRGBA); c != want {
     47 			t.Errorf("the drawing at %d pixels is %v, want %v", size, c, want)
     48 		}
     49 	}
     50 }