mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-07 20:30:36 -05:00
77 lines
2 KiB
Go
77 lines
2 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 resources
|
|
|
|
import (
|
|
"image"
|
|
|
|
"github.com/disintegration/imaging"
|
|
"github.com/muesli/smartcrop"
|
|
)
|
|
|
|
const (
|
|
// Do not change.
|
|
smartCropIdentifier = "smart"
|
|
|
|
// This is just a increment, starting on 1. If Smart Crop improves its cropping, we
|
|
// need a way to trigger a re-generation of the crops in the wild, so increment this.
|
|
smartCropVersionNumber = 1
|
|
)
|
|
|
|
// Needed by smartcrop
|
|
type imagingResizer struct {
|
|
filter imaging.ResampleFilter
|
|
}
|
|
|
|
func (r imagingResizer) Resize(img image.Image, width, height uint) image.Image {
|
|
return imaging.Resize(img, int(width), int(height), r.filter)
|
|
}
|
|
|
|
func newSmartCropAnalyzer(filter imaging.ResampleFilter) smartcrop.Analyzer {
|
|
return smartcrop.NewAnalyzer(imagingResizer{filter: filter})
|
|
}
|
|
|
|
func smartCrop(img image.Image, width, height int, anchor imaging.Anchor, filter imaging.ResampleFilter) (*image.NRGBA, error) {
|
|
|
|
if width <= 0 || height <= 0 {
|
|
return &image.NRGBA{}, nil
|
|
}
|
|
|
|
srcBounds := img.Bounds()
|
|
srcW := srcBounds.Dx()
|
|
srcH := srcBounds.Dy()
|
|
|
|
if srcW <= 0 || srcH <= 0 {
|
|
return &image.NRGBA{}, nil
|
|
}
|
|
|
|
if srcW == width && srcH == height {
|
|
return imaging.Clone(img), nil
|
|
}
|
|
|
|
smart := newSmartCropAnalyzer(filter)
|
|
|
|
rect, err := smart.FindBestCrop(img, width, height)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
b := img.Bounds().Intersect(rect)
|
|
|
|
cropped := imaging.Crop(img, b)
|
|
|
|
return imaging.Resize(cropped, width, height, filter), nil
|
|
|
|
}
|