congo/layouts/partials/picture.html

{{ $url := urls.Parse .src }}
{{ $altText := .alt }}
{{ $class := .class | default "mx-auto my-0 rounded-md" }}

{{ $lazyLoad := .context.Page.Site.Params.enableImageLazyLoading | default true }}
{{ $webp := .context.Page.Site.Params.enableWebp | default true }}

{{ if findRE "^https?" $url.Scheme }}
  <img
    class="{{ $class }}"
    src="{{ $url.String }}"
    alt="{{ $altText }}" 
    {{ if $lazyLoad }}
      loading="lazy"
    {{ end }}
  />
{{ else }}
  {{ $resource := "" }}
  {{ if .resource }}
    {{ $resource = .resource }}
  {{ else if .context.Page.Resources.GetMatch ($url.String) }}
    {{ $resource = .context.Page.Resources.GetMatch ($url.String) }}
  {{ else if resources.GetMatch ($url.String) }}
    {{ $resource = resources.Get ($url.String) }}
  {{ end }}
  {{ with $resource }}
    <picture>
      {{ if (and (ne .MediaType.SubType "svg") $webp) }}
        <source 
          {{ if lt .Width 660 }}
            {{ with .Resize (printf "%dx%d webp" .Width .Height) }}
              src="{{ .RelPermalink }}"
            {{ end }}
          {{ else }}
            srcset="
              {{- (.Resize "330x webp").RelPermalink }} 330w,
              {{- (.Resize "660x webp").RelPermalink }} 660w,
              {{- (.Resize "1024x webp").RelPermalink }} 1024w,
              {{- (.Resize "1320x webp").RelPermalink }} 2x"
            src="{{ (.Resize "660x webp").RelPermalink }}" 
          {{ end }}
          type="image/webp" 
        />
      {{ end }}
      <img
        class="{{ $class }}"
        {{ if eq .MediaType.SubType "svg" }}
          src="{{ .RelPermalink }}"
        {{ else }}
          width="{{ .Width }}"
          height="{{ .Height }}"
          decoding="async"
          {{ if lt .Width 660 }}
            src="{{ .RelPermalink }}"
          {{ else }}
            srcset="
            {{- (.Resize "330x").RelPermalink }} 330w,
            {{- (.Resize "660x").RelPermalink }} 660w,
            {{- (.Resize "1024x").RelPermalink }} 1024w,
            {{- (.Resize "1320x").RelPermalink }} 2x"
            src="{{ (.Resize "660x").RelPermalink }}"
          {{ end }}
        {{ end }}
        alt="{{ $altText }}"
        {{ if $lazyLoad }}
          loading="lazy"
        {{ end }}
      />
    </picture>
  {{ else }}
    <img
      class="{{ $class }}"
      src="{{ $url.String }}"
      alt="{{ $altText }}"
      {{ if $lazyLoad }}
        loading="lazy"
      {{ end }}
    />
  {{ end }}
{{ end }}