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81 lines
2 KiB
Go
81 lines
2 KiB
Go
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// Copyright 2017-present 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 resource
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import (
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"image"
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"github.com/disintegration/imaging"
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"github.com/muesli/smartcrop"
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)
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const (
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// Do not change.
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smartCropIdentifier = "smart"
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// This is just a increment, starting on 1. If Smart Crop improves its cropping, we
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// need a way to trigger a re-generation of the crops in the wild, so increment this.
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smartCropVersionNumber = 1
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)
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// Needed by smartcrop
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type imagingResizer struct {
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filter imaging.ResampleFilter
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}
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func (r imagingResizer) Resize(img image.Image, width, height uint) image.Image {
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return imaging.Resize(img, int(width), int(height), r.filter)
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}
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func newSmartCropAnalyzer(filter imaging.ResampleFilter) smartcrop.Analyzer {
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return smartcrop.NewAnalyzer(imagingResizer{filter: filter})
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}
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func smartCrop(img image.Image, width, height int, anchor imaging.Anchor, filter imaging.ResampleFilter) (*image.NRGBA, error) {
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if width <= 0 || height <= 0 {
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return &image.NRGBA{}, nil
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}
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srcBounds := img.Bounds()
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srcW := srcBounds.Dx()
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srcH := srcBounds.Dy()
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if srcW <= 0 || srcH <= 0 {
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return &image.NRGBA{}, nil
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}
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if srcW == width && srcH == height {
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return imaging.Clone(img), nil
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}
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smart := newSmartCropAnalyzer(filter)
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rect, err := smart.FindBestCrop(img, width, height)
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if err != nil {
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return nil, err
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}
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b := img.Bounds().Intersect(rect)
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cropped, err := imaging.Crop(img, b), nil
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if err != nil {
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return nil, err
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}
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return imaging.Resize(cropped, width, height, filter), nil
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}
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