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color_test.go
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color_test.go
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package ring
import (
"fmt"
"image/color"
"testing"
)
func TestMod(t *testing.T) {
const n = 12
tests := []struct {
idx int
want int
}{
{
1,
1,
},
{
12,
0,
},
{
13,
1,
},
{
-1,
11,
},
}
for _, ts := range tests {
t.Run(fmt.Sprintf("%d", ts.idx), func(t *testing.T) {
got := mod(ts.idx, n)
if got != ts.want {
t.Errorf("got: %#v, want: %#v", got, ts.want)
}
})
}
}
func TestSerialize(t *testing.T) {
tests := []struct {
name string
color color.Color
want uint32
}{
{
"rgb",
color.NRGBA{0x16, 0x16, 0x16, 0xFF},
0x161616,
},
{
"alpha",
color.NRGBA{0xFF, 0xFF, 0xFF, 0x32},
0x323232,
},
{
"16bit",
color.NRGBA64{0x3214, 0x1234, 0x00FF, 0xFFFF},
0x321200,
},
{
"gray",
color.Gray{0x10},
0x101010,
},
}
for _, ts := range tests {
t.Run(ts.name, func(t *testing.T) {
got := serialize(ts.color)
if got != ts.want {
t.Errorf("got: %#v, want: %#v", got, ts.want)
}
})
}
}
func TestBlendOver(t *testing.T) {
tests := []struct {
name string
colors []color.Color
want color.RGBA
}{
{
"single",
[]color.Color{
color.RGBA{0x15, 0x16, 0x17, 0x18},
},
color.RGBA{0x15, 0x16, 0x17, 0x18},
},
{
"white over black",
[]color.Color{
color.RGBA{0x00, 0x00, 0x00, 0xFF},
color.RGBA{0xFF, 0xFF, 0xFF, 0xFF},
},
color.RGBA{0xFF, 0xFF, 0xFF, 0xFF},
},
{
"black over white",
[]color.Color{
color.RGBA{0xFF, 0xFF, 0xFF, 0xFF},
color.RGBA{0x00, 0x00, 0x00, 0xFF},
},
color.RGBA{0x00, 0x00, 0x00, 0xFF},
},
{
"red over green",
[]color.Color{
color.NRGBA{0x00, 0x80, 0x00, 0xFF},
color.NRGBA{0x80, 0x00, 0x00, 0xA1},
},
color.RGBA{0x51, 0x2F, 0x00, 0xFF},
},
}
for _, ts := range tests {
t.Run(ts.name, func(t *testing.T) {
got := *blendOver(ts.colors...)
if got != ts.want {
t.Errorf("got: %#v, want: %#v", got, ts.want)
}
})
}
}
func TestBlendLerp(t *testing.T) {
tests := []struct {
name string
colorA color.Color
colorB color.Color
l float64
want color.RGBA
}{
{
"fullA",
color.RGBA{128, 128, 0, 128},
color.RGBA{0, 255, 255, 255},
0.0,
color.RGBA{128, 128, 0, 128},
},
{
"fullB",
color.RGBA{128, 128, 0, 128},
color.RGBA{0, 255, 255, 255},
1.0,
color.RGBA{0, 255, 255, 255},
},
{
"half",
color.RGBA{128, 128, 0, 128},
color.RGBA{0, 255, 255, 255},
0.5,
color.RGBA{64, 192, 127, 192},
},
{
"quater",
color.RGBA{128, 128, 0, 128},
color.RGBA{0, 255, 255, 255},
0.75,
color.RGBA{32, 224, 191, 224},
},
}
for _, ts := range tests {
t.Run(ts.name, func(t *testing.T) {
got := *blendLerp(ts.colorA, ts.colorB, ts.l)
if got != ts.want {
t.Errorf("got: %v, want: %v", got, ts.want)
}
})
}
}