resource: Add smart cropping

This commit `smart` as a new and default anchor in `Fill`.

So:

```html
{{ $image.Fill "200x200" }}
```

Is, with default configuration, the same as:

```html
{{ $image.Fill "200x200" "smart" }}
```

You can change this default in your `config.toml`:

```toml
[imaging]
[imaging]
resampleFilter = "box"

quality = 68

anchor = "Smart"
```

Fixes #4375

1 files changed, 9 insertions, 0 deletions

diff --git a/resource/testhelpers_test.go b/resource/testhelpers_test.go
index 03a6d6134..2b543ab64 100644
--- a/resource/testhelpers_test.go
+++ b/resource/testhelpers_test.go
@@ -25,6 +25,15 @@ func newTestResourceSpecForBaseURL(assert *require.Assertions, baseURL string) *
 	cfg := viper.New()
 	cfg.Set("baseURL", baseURL)
 	cfg.Set("resourceDir", "/res")
+
+	imagingCfg := map[string]interface{}{
+		"resampleFilter": "linear",
+		"quality":        68,
+		"anchor":         "left",
+	}
+
+	cfg.Set("imaging", imagingCfg)
+
 	fs := hugofs.NewMem(cfg)
 
 	s, err := helpers.NewPathSpec(fs, cfg)