{{- /* Automatic resizing for HiDPI/retina images */ -}}

{{- $original := .Page.Resources.GetMatch (.Get "src") -}}
{{- .Scratch.Set "image" $original -}}

{{- $maxWidth := 910 -}}
{{- $setWidth := 0 -}}

{{- if .Get "width" -}}
  {{- $setWidth = (int (.Get "width")) -}}
  {{- $retinaWidth := (mul $setWidth 2) -}}

  {{- if gt $original.Width $retinaWidth -}}
    {{- $finalWidth := (printf "%dx" $retinaWidth) -}}
    {{- .Scratch.Set "image" ($original.Resize $finalWidth) -}}
  {{- end -}}
{{- else -}}
  {{- $setWidth = $maxWidth -}}
  {{- if gt $original.Width 1820 -}}
    {{- .Scratch.Set "image" ($original.Resize "1820x") -}}
  {{- end -}}
{{- end -}}

{{- $image := .Scratch.Get "image" -}}

{{- $origRatio := (div (float $image.Height) $image.Width) -}}
{{- $displayWidth := $setWidth -}}
{{- $displayHeight := (math.Ceil (mul $origRatio $setWidth)) -}}

{{ with .Inner }}
<figure>
  <picture>
    <img src="{{ $image.Permalink }}" width="{{ $displayWidth }}" height="{{ $displayHeight }}"
         alt="{{ . | markdownify | plainify | safeHTMLAttr }}" title="{{ . | markdownify | plainify | safeHTMLAttr }}">
  </picture>
  <figcaption>{{ $.Page.RenderString . | safeHTML }}</figcaption>
</figure>
{{ else }}
<p><img src="{{ $image.Permalink }}" width="{{ $displayWidth }}" height="{{ $displayHeight }}"
     {{- with .Get "alt" }} alt="{{ . | safeHTMLAttr }}" title="{{ . | safeHTMLAttr }}"{{ end }}></p>
{{ end }}