mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 05:02:03 -05:00
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Copyright 2023 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 images
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import (
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"image"
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"image/draw"
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"github.com/disintegration/gift"
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"github.com/gohugoio/hugo/resources/images/exif"
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)
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var _ gift.Filter = (*autoOrientFilter)(nil)
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var transformationFilters = map[int]gift.Filter{
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2: gift.FlipHorizontal(),
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3: gift.Rotate180(),
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4: gift.FlipVertical(),
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5: gift.Transpose(),
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6: gift.Rotate270(),
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7: gift.Transverse(),
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8: gift.Rotate90(),
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}
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type autoOrientFilter struct{}
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type ImageFilterFromOrientationProvider interface {
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AutoOrient(exifInfo *exif.ExifInfo) gift.Filter
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}
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func (f autoOrientFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
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panic("not supported")
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}
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func (f autoOrientFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
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panic("not supported")
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}
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func (f autoOrientFilter) AutoOrient(exifInfo *exif.ExifInfo) gift.Filter {
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if exifInfo != nil {
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if orientation, ok := exifInfo.Tags["Orientation"].(int); ok {
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if filter, ok := transformationFilters[orientation]; ok {
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return filter
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}
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}
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}
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return nil
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}
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