Images sociales

layouts/partials/head/social-image-variant.html

@@ -0,0 +1,54 @@
+{{- $image := .image -}}
+{{- if not $image -}}
+  {{- errorf "head/social-image-variant.html: missing image resource" -}}
+{{- end -}}
+
+{{- $targetWidth := .width -}}
+{{- if not $targetWidth -}}
+  {{- errorf "head/social-image-variant.html: missing target width for %q" $image.Name -}}
+{{- end -}}
+
+{{- $targetHeight := .height -}}
+{{- if not $targetHeight -}}
+  {{- errorf "head/social-image-variant.html: missing target height for %q" $image.Name -}}
+{{- end -}}
+
+{{- $anchor := .anchor -}}
+{{- if not $anchor -}}
+  {{- errorf "head/social-image-variant.html: missing crop anchor for %q" $image.Name -}}
+{{- end -}}
+
+{{- $subType := lower $image.MediaType.SubType -}}
+{{- if eq $subType "svg" -}}
+  {{- errorf "head/social-image-variant.html: unsupported svg image %q" $image.Name -}}
+{{- end -}}
+
+{{- $width := $targetWidth -}}
+{{- $height := $targetHeight -}}
+{{- if ge (mul $image.Width $targetHeight) (mul $image.Height $targetWidth) -}}
+  {{- if lt $image.Height $height -}}
+    {{- $height = $image.Height -}}
+  {{- end -}}
+  {{- $width = div (mul $height $targetWidth) $targetHeight -}}
+{{- else -}}
+  {{- if lt $image.Width $width -}}
+    {{- $width = $image.Width -}}
+  {{- end -}}
+  {{- $height = div (mul $width $targetHeight) $targetWidth -}}
+{{- end -}}
+
+{{- $format := "jpg q85" -}}
+{{- if eq $subType "png" -}}
+  {{- $format = "png" -}}
+{{- end -}}
+
+{{- $variant := $image.Fill (printf "%dx%d %s %s" $width $height $anchor $format) -}}
+{{- if .blur -}}
+  {{- $variant = $variant.Filter (images.GaussianBlur 6) -}}
+{{- end -}}
+{{- return dict
+  "url" $variant.Permalink
+  "width" $variant.Width
+  "height" $variant.Height
+  "alt" (.alt | strings.TrimSpace | truncate 420)
+-}}