mirror of https://github.com/gohugoio/hugo
63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
// Copyright 2024 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 images
|
|
|
|
import (
|
|
"image"
|
|
"image/draw"
|
|
|
|
"github.com/disintegration/gift"
|
|
"github.com/gohugoio/hugo/resources/images/exif"
|
|
"github.com/spf13/cast"
|
|
)
|
|
|
|
var _ gift.Filter = (*autoOrientFilter)(nil)
|
|
|
|
var transformationFilters = map[int]gift.Filter{
|
|
2: gift.FlipHorizontal(),
|
|
3: gift.Rotate180(),
|
|
4: gift.FlipVertical(),
|
|
5: gift.Transpose(),
|
|
6: gift.Rotate270(),
|
|
7: gift.Transverse(),
|
|
8: gift.Rotate90(),
|
|
}
|
|
|
|
type autoOrientFilter struct{}
|
|
|
|
type ImageFilterFromOrientationProvider interface {
|
|
AutoOrient(exifInfo *exif.ExifInfo) gift.Filter
|
|
}
|
|
|
|
func (f autoOrientFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
|
|
panic("not supported")
|
|
}
|
|
|
|
func (f autoOrientFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
|
|
panic("not supported")
|
|
}
|
|
|
|
func (f autoOrientFilter) AutoOrient(exifInfo *exif.ExifInfo) gift.Filter {
|
|
if exifInfo != nil {
|
|
if v, ok := exifInfo.Tags["Orientation"]; ok {
|
|
orientation := cast.ToInt(v)
|
|
if filter, ok := transformationFilters[orientation]; ok {
|
|
return filter
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|