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e197c7b29d
To sort an image's colors from darkest to lightest, you can then do:
```handlebars
{{ {{ $colorsByLuminance := sort $image.Colors "Luminance" }}
```
This uses the formula defined here: https://www.w3.org/TR/WCAG21/#dfn-relative-luminance
Fixes #10450
126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"image/color"
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"testing"
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qt "github.com/frankban/quicktest"
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)
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func TestHexStringToColor(t *testing.T) {
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c := qt.New(t)
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for _, test := range []struct {
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arg string
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expect any
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}{
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{"f", false},
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{"#f", false},
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{"#fffffff", false},
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{"fffffff", false},
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{"#fff", color.White},
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{"fff", color.White},
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{"FFF", color.White},
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{"FfF", color.White},
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{"#ffffff", color.White},
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{"ffffff", color.White},
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{"#000", color.Black},
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{"#4287f5", color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0xff}},
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{"777", color.RGBA{R: 0x77, G: 0x77, B: 0x77, A: 0xff}},
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} {
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test := test
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c.Run(test.arg, func(c *qt.C) {
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c.Parallel()
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result, err := hexStringToColorGo(test.arg)
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if b, ok := test.expect.(bool); ok && !b {
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c.Assert(err, qt.Not(qt.IsNil))
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return
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}
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c.Assert(err, qt.IsNil)
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c.Assert(result, qt.DeepEquals, test.expect)
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})
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}
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}
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func TestColorToHexString(t *testing.T) {
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c := qt.New(t)
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for _, test := range []struct {
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arg color.Color
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expect string
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}{
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{color.White, "#ffffff"},
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{color.Black, "#000000"},
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{color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0xff}, "#4287f5"},
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// 50% opacity.
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// Note that the .Colors (dominant colors) received from the Image resource
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// will always have an alpha value of 0xff.
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{color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0x80}, "#4287f580"},
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} {
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test := test
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c.Run(test.expect, func(c *qt.C) {
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c.Parallel()
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result := ColorGoToHexString(test.arg)
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c.Assert(result, qt.Equals, test.expect)
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})
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}
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}
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func TestAddColorToPalette(t *testing.T) {
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c := qt.New(t)
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palette := color.Palette{color.White, color.Black}
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c.Assert(AddColorToPalette(color.White, palette), qt.HasLen, 2)
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blue1, _ := hexStringToColorGo("34c3eb")
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blue2, _ := hexStringToColorGo("34c3eb")
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white, _ := hexStringToColorGo("fff")
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c.Assert(AddColorToPalette(white, palette), qt.HasLen, 2)
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c.Assert(AddColorToPalette(blue1, palette), qt.HasLen, 3)
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c.Assert(AddColorToPalette(blue2, palette), qt.HasLen, 3)
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}
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func TestReplaceColorInPalette(t *testing.T) {
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c := qt.New(t)
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palette := color.Palette{color.White, color.Black}
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offWhite, _ := hexStringToColorGo("fcfcfc")
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ReplaceColorInPalette(offWhite, palette)
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c.Assert(palette, qt.HasLen, 2)
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c.Assert(palette[0], qt.Equals, offWhite)
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}
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func TestColorLuminance(t *testing.T) {
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c := qt.New(t)
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c.Assert(hexStringToColor("#000000").Luminance(), qt.Equals, 0.0)
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c.Assert(hexStringToColor("#768a9a").Luminance(), qt.Equals, 0.24361603589088263)
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c.Assert(hexStringToColor("#d5bc9f").Luminance(), qt.Equals, 0.5261577672685374)
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c.Assert(hexStringToColor("#ffffff").Luminance(), qt.Equals, 1.0)
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}
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