mirror of
https://github.com/gohugoio/hugo.git
synced 2024-07-04 08:11:55 +00:00
823f53c861
With this you can do variants of this:
```
{{ $img := resources.Get "images/misc/3-jenny.jpg" }}
{{ $img := $img.Resize "300x" }}
{{ $g1 := $img.Filter images.Grayscale }}
{{ $g2 := $img | images.Filter (images.Saturate 30) (images.GaussianBlur 3) }}
```
Fixes #6255
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
// 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 internal
|
|
|
|
import (
|
|
"strconv"
|
|
|
|
"github.com/mitchellh/hashstructure"
|
|
)
|
|
|
|
// ResourceTransformationKey are provided by the different transformation implementations.
|
|
// It identifies the transformation (name) and its configuration (elements).
|
|
// We combine this in a chain with the rest of the transformations
|
|
// with the target filename and a content hash of the origin to use as cache key.
|
|
type ResourceTransformationKey struct {
|
|
Name string
|
|
elements []interface{}
|
|
}
|
|
|
|
// NewResourceTransformationKey creates a new ResourceTransformationKey from the transformation
|
|
// name and elements. We will create a 64 bit FNV hash from the elements, which when combined
|
|
// with the other key elements should be unique for all practical applications.
|
|
func NewResourceTransformationKey(name string, elements ...interface{}) ResourceTransformationKey {
|
|
return ResourceTransformationKey{Name: name, elements: elements}
|
|
}
|
|
|
|
// Value returns the Key as a string.
|
|
// Do not change this without good reasons.
|
|
func (k ResourceTransformationKey) Value() string {
|
|
if len(k.elements) == 0 {
|
|
return k.Name
|
|
}
|
|
|
|
return k.Name + "_" + HashString(k.elements...)
|
|
|
|
}
|
|
|
|
// HashString returns a hash from the given elements.
|
|
// It will panic if the hash cannot be calculated.
|
|
func HashString(elements ...interface{}) string {
|
|
var o interface{}
|
|
if len(elements) == 1 {
|
|
o = elements[0]
|
|
} else {
|
|
o = elements
|
|
}
|
|
|
|
hash, err := hashstructure.Hash(o, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return strconv.FormatUint(hash, 10)
|
|
}
|