mirror of
https://github.com/gohugoio/hugo.git
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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
145 lines
3.8 KiB
Go
145 lines
3.8 KiB
Go
// Copyright 2021 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 resources
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import (
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"context"
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"image"
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"github.com/gohugoio/hugo/common/hugio"
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"github.com/gohugoio/hugo/common/maps"
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"github.com/gohugoio/hugo/media"
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"github.com/gohugoio/hugo/resources/images"
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"github.com/gohugoio/hugo/resources/images/exif"
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"github.com/gohugoio/hugo/resources/resource"
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)
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var (
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_ error = (*errorResource)(nil)
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// Image covers all current Resource implementations.
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_ images.ImageResource = (*errorResource)(nil)
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// The list of user facing and exported interfaces in resource.go
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// Note that if we're missing some interface here, the user will still
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// get an error, but not as pretty.
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_ resource.ContentResource = (*errorResource)(nil)
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_ resource.ReadSeekCloserResource = (*errorResource)(nil)
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_ resource.ResourcesLanguageMerger = (*resource.Resources)(nil)
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// Make sure it also fails when passed to a pipe function.
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_ ResourceTransformer = (*errorResource)(nil)
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)
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// NewErrorResource wraps err in a Resource where all but the Err method will panic.
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func NewErrorResource(err resource.ResourceError) resource.Resource {
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return &errorResource{ResourceError: err}
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}
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type errorResource struct {
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resource.ResourceError
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}
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func (e *errorResource) Err() resource.ResourceError {
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return e.ResourceError
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}
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func (e *errorResource) ReadSeekCloser() (hugio.ReadSeekCloser, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Content(context.Context) (any, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) ResourceType() string {
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panic(e.ResourceError)
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}
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func (e *errorResource) MediaType() media.Type {
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panic(e.ResourceError)
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}
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func (e *errorResource) Permalink() string {
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panic(e.ResourceError)
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}
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func (e *errorResource) RelPermalink() string {
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panic(e.ResourceError)
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}
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func (e *errorResource) Name() string {
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panic(e.ResourceError)
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}
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func (e *errorResource) Title() string {
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panic(e.ResourceError)
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}
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func (e *errorResource) Params() maps.Params {
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panic(e.ResourceError)
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}
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func (e *errorResource) Data() any {
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panic(e.ResourceError)
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}
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func (e *errorResource) Height() int {
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panic(e.ResourceError)
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}
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func (e *errorResource) Width() int {
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panic(e.ResourceError)
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}
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func (e *errorResource) Process(spec string) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Crop(spec string) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Fill(spec string) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Fit(spec string) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Resize(spec string) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Filter(filters ...any) (images.ImageResource, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Exif() *exif.ExifInfo {
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panic(e.ResourceError)
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}
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func (e *errorResource) Colors() ([]images.Color, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) DecodeImage() (image.Image, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) Transform(...ResourceTransformation) (ResourceTransformer, error) {
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panic(e.ResourceError)
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}
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func (e *errorResource) TransformWithContext(context.Context, ...ResourceTransformation) (ResourceTransformer, error) {
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panic(e.ResourceError)
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}
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