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

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

{{- $setWidth := 910 -}}

{{- if .Get "width" -}}
  {{- $setWidth = (int (.Get "width")) -}}
{{- end -}}

{{- $retinaWidth := (mul $setWidth 2) -}}

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

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

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

{{- return $image -}}