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Add images.Process filter

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This allows for constructs like:

```
{{ $filters := slice (images.GaussianBlur 8) (images.Grayscale) (images.Process "jpg q30 resize 200x") }}
{{ $img = $img | images.Filter $filters }}
```

Note that the `action` option in `images.Process` is optional (`resize` in the example above), so you can use the above to just set the target format, e.g.:

```
{{ $filters := slice (images.GaussianBlur 8) (images.Grayscale) (images.Process "jpg") }}
{{ $img = $img | images.Filter $filters }}
```

Fixes #8439
This commit is contained in:
Bjørn Erik Pedersen
2023-09-23 11:45:17 +02:00
parent ef0e7149d6
commit 6a246d1152
6 changed files with 204 additions and 16 deletions
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19
resources/images/image.go
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@@ -201,7 +201,7 @@ func (p *ImageProcessor) DecodeExif(r io.Reader) (*exif.ExifInfo, error) {
return p.exifDecoder.Decode(r)
}
func (p *ImageProcessor) ApplyFiltersFromConfig(src image.Image, conf ImageConfig) (image.Image, error) {
func (p *ImageProcessor) FiltersFromConfig(src image.Image, conf ImageConfig) ([]gift.Filter, error) {
var filters []gift.Filter
if conf.Rotate != 0 {
@@ -246,6 +246,14 @@ func (p *ImageProcessor) ApplyFiltersFromConfig(src image.Image, conf ImageConfi
default:
}
return filters, nil
}
func (p *ImageProcessor) ApplyFiltersFromConfig(src image.Image, conf ImageConfig) (image.Image, error) {
filters, err := p.FiltersFromConfig(src, conf)
if err != nil {
return nil, err
}
if len(filters) == 0 {
return p.resolveSrc(src, conf.TargetFormat), nil
@@ -396,6 +404,15 @@ func imageConfigFromImage(img image.Image) image.Config {
return image.Config{Width: b.Max.X, Height: b.Max.Y}
}
// UnwrapFilter unwraps the given filter if it is a filter wrapper.
func UnwrapFilter(in gift.Filter) gift.Filter {
if f, ok := in.(filter); ok {
return f.Filter
}
return in
}
// ToFilters converts the given input to a slice of gift.Filter.
func ToFilters(in any) []gift.Filter {
switch v := in.(type) {
case []gift.Filter: