mirror of
https://github.com/gohugoio/hugo.git
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120 lines
2.8 KiB
Go
120 lines
2.8 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 provides template functions for manipulating images.
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package images
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import (
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"errors"
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"image"
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"sync"
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"github.com/bep/overlayfs"
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"github.com/gohugoio/hugo/resources/images"
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// Importing image codecs for image.DecodeConfig
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_ "image/gif"
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_ "image/jpeg"
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_ "image/png"
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// Import webp codec
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_ "golang.org/x/image/webp"
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"github.com/gohugoio/hugo/deps"
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"github.com/spf13/afero"
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"github.com/spf13/cast"
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)
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// New returns a new instance of the images-namespaced template functions.
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func New(d *deps.Deps) *Namespace {
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var readFileFs afero.Fs
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// The docshelper script does not have or need all the dependencies set up.
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if d.PathSpec != nil {
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readFileFs = overlayfs.New(overlayfs.Options{
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Fss: []afero.Fs{
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d.PathSpec.BaseFs.Work,
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d.PathSpec.BaseFs.Content.Fs,
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},
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})
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}
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return &Namespace{
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readFileFs: readFileFs,
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Filters: &images.Filters{},
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cache: map[string]image.Config{},
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deps: d,
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}
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}
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// Namespace provides template functions for the "images" namespace.
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type Namespace struct {
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*images.Filters
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readFileFs afero.Fs
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cacheMu sync.RWMutex
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cache map[string]image.Config
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deps *deps.Deps
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}
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// Config returns the image.Config for the specified path relative to the
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// working directory.
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func (ns *Namespace) Config(path any) (image.Config, error) {
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filename, err := cast.ToStringE(path)
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if err != nil {
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return image.Config{}, err
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}
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if filename == "" {
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return image.Config{}, errors.New("config needs a filename")
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}
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// Check cache for image config.
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ns.cacheMu.RLock()
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config, ok := ns.cache[filename]
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ns.cacheMu.RUnlock()
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if ok {
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return config, nil
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}
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f, err := ns.readFileFs.Open(filename)
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if err != nil {
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return image.Config{}, err
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}
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defer f.Close()
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config, _, err = image.DecodeConfig(f)
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if err != nil {
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return config, err
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}
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ns.cacheMu.Lock()
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ns.cache[filename] = config
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ns.cacheMu.Unlock()
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return config, nil
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}
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// Filter applies the given filters to the image given as the last element in args.
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func (ns *Namespace) Filter(args ...any) (images.ImageResource, error) {
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if len(args) < 2 {
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return nil, errors.New("must provide an image and one or more filters")
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}
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img := args[len(args)-1].(images.ImageResource)
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filtersv := args[:len(args)-1]
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return img.Filter(filtersv...)
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}
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