auto_orient.go - hugo - [fork] hugo port for 9front
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       ---
       auto_orient.go (1672B)
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            1 // Copyright 2024 The Hugo Authors. All rights reserved.
            2 //
            3 // Licensed under the Apache License, Version 2.0 (the "License");
            4 // you may not use this file except in compliance with the License.
            5 // You may obtain a copy of the License at
            6 // http://www.apache.org/licenses/LICENSE-2.0
            7 //
            8 // Unless required by applicable law or agreed to in writing, software
            9 // distributed under the License is distributed on an "AS IS" BASIS,
           10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
           11 // See the License for the specific language governing permissions and
           12 // limitations under the License.
           13 
           14 package images
           15 
           16 import (
           17         "image"
           18         "image/draw"
           19 
           20         "github.com/disintegration/gift"
           21         "github.com/gohugoio/hugo/resources/images/exif"
           22         "github.com/spf13/cast"
           23 )
           24 
           25 var _ gift.Filter = (*autoOrientFilter)(nil)
           26 
           27 var transformationFilters = map[int]gift.Filter{
           28         2: gift.FlipHorizontal(),
           29         3: gift.Rotate180(),
           30         4: gift.FlipVertical(),
           31         5: gift.Transpose(),
           32         6: gift.Rotate270(),
           33         7: gift.Transverse(),
           34         8: gift.Rotate90(),
           35 }
           36 
           37 type autoOrientFilter struct{}
           38 
           39 type ImageFilterFromOrientationProvider interface {
           40         AutoOrient(exifInfo *exif.ExifInfo) gift.Filter
           41 }
           42 
           43 func (f autoOrientFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
           44         panic("not supported")
           45 }
           46 
           47 func (f autoOrientFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
           48         panic("not supported")
           49 }
           50 
           51 func (f autoOrientFilter) AutoOrient(exifInfo *exif.ExifInfo) gift.Filter {
           52         if exifInfo != nil {
           53                 if v, ok := exifInfo.Tags["Orientation"]; ok {
           54                         orientation := cast.ToInt(v)
           55                         if filter, ok := transformationFilters[orientation]; ok {
           56                                 return filter
           57                         }
           58                 }
           59         }
           60 
           61         return nil
           62 }