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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package images
import (
"image/color"
"testing"
qt "github.com/frankban/quicktest"
"github.com/gohugoio/hugo/htesting/hqt"
)
func TestHexStringToColor(t *testing.T) {
c := qt.New(t)
for _, test := range []struct {
arg string
expect any
}{
{"f", false},
{"#f", false},
{"#fffffff", false},
{"fffffff", false},
{"#fff", color.White},
{"fff", color.White},
{"FFF", color.White},
{"FfF", color.White},
{"#ffffff", color.White},
{"ffffff", color.White},
{"#000", color.Black},
{"#4287f5", color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0xff}},
{"777", color.RGBA{R: 0x77, G: 0x77, B: 0x77, A: 0xff}},
} {
test := test
c.Run(test.arg, func(c *qt.C) {
c.Parallel()
result, err := hexStringToColorGo(test.arg)
if b, ok := test.expect.(bool); ok && !b {
c.Assert(err, qt.Not(qt.IsNil))
return
}
c.Assert(err, qt.IsNil)
c.Assert(result, qt.DeepEquals, test.expect)
})
}
}
func TestColorToHexString(t *testing.T) {
c := qt.New(t)
for _, test := range []struct {
arg color.Color
expect string
}{
{color.White, "#ffffff"},
{color.Black, "#000000"},
{color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0xff}, "#4287f5"},
// 50% opacity.
// Note that the .Colors (dominant colors) received from the Image resource
// will always have an alpha value of 0xff.
{color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0x80}, "#4287f580"},
} {
test := test
c.Run(test.expect, func(c *qt.C) {
c.Parallel()
result := ColorGoToHexString(test.arg)
c.Assert(result, qt.Equals, test.expect)
})
}
}
func TestAddColorToPalette(t *testing.T) {
c := qt.New(t)
palette := color.Palette{color.White, color.Black}
c.Assert(AddColorToPalette(color.White, palette), qt.HasLen, 2)
blue1, _ := hexStringToColorGo("34c3eb")
blue2, _ := hexStringToColorGo("34c3eb")
white, _ := hexStringToColorGo("fff")
c.Assert(AddColorToPalette(white, palette), qt.HasLen, 2)
c.Assert(AddColorToPalette(blue1, palette), qt.HasLen, 3)
c.Assert(AddColorToPalette(blue2, palette), qt.HasLen, 3)
}
func TestReplaceColorInPalette(t *testing.T) {
c := qt.New(t)
palette := color.Palette{color.White, color.Black}
offWhite, _ := hexStringToColorGo("fcfcfc")
ReplaceColorInPalette(offWhite, palette)
c.Assert(palette, qt.HasLen, 2)
c.Assert(palette[0], qt.Equals, offWhite)
}
func TestColorLuminance(t *testing.T) {
c := qt.New(t)
c.Assert(hexStringToColor("#000000").Luminance(), hqt.IsSameFloat64, 0.0)
c.Assert(hexStringToColor("#768a9a").Luminance(), hqt.IsSameFloat64, 0.24361603589088263)
c.Assert(hexStringToColor("#d5bc9f").Luminance(), hqt.IsSameFloat64, 0.5261577672685374)
c.Assert(hexStringToColor("#ffffff").Luminance(), hqt.IsSameFloat64, 1.0)
}
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