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images: Add images.Overlay filter

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This allows for constructs ala:

```
{{ $overlay := $img.Filter (images.Overlay $logo 50 50 )}}
```
Or:

```
{{ $logoFilter := (images.Overlay $logo 50 50 ) }}
{{ $overlay := $img | images.Filter $logoFilter }}
```

Which will overlay the logo in the top left corner (x=50, y=50) of `$img`.

Fixes #8057
Fixes #4595
Updates #6731
This commit is contained in:
Bjørn Erik Pedersen
2020-12-16 13:52:47 +01:00
parent a2d146ec32
commit 3ba147e702
12 changed files with 101 additions and 2 deletions
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5
resources/transform.go
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@@ -16,6 +16,7 @@ package resources
import (
"bytes"
"fmt"
"image"
"io"
"path"
"strings"
@@ -264,6 +265,10 @@ func (r *resourceAdapter) Width() int {
return r.getImageOps().Width()
}
func (r *resourceAdapter) DecodeImage() (image.Image, error) {
return r.getImageOps().DecodeImage()
}
func (r *resourceAdapter) getImageOps() resource.ImageOps {
img, ok := r.target.(resource.ImageOps)
if !ok {