{{- define "RenderImageSimple" -}}
{{- $imgObj := .imgObj -}}
{{- $src := .src -}}
{{- $alt := .alt -}}
{{- end -}}
{{- define "RenderImageResponsive" -}}
{{/* Responsive Image
The current setting sizes="(min-width: 768px) 50vw, 65vw" makes the iPhone 16 and 16 Pro
select a smaller image, while the iPhone 16 Pro Max selects a larger image.
Steps:
1. Check the media queries in the `sizes` property.
2. Find the first matching value. For example, on a mobile device with a CSS pixel width
of 390px and DPR = 3 (iPhone 13), given setting sizes="(min-width: 768px) 50vw, 100vw",
it matches the `100vw` option.
3. Calculate the optimal image size: 390 × 3 × 100% (100vw) = 1170.
4. Find the corresponding match in the `srcset`.
To make the browser select a smaller image on mobile devices
override the template and change the `sizes` property to "(min-width: 768px) 50vw, 30vw"
The sizes="auto" is valid only when loading="lazy".
*/}}
{{- $imgObj := .imgObj -}}
{{- $alt := .alt -}}
{{- $originalWidth := $imgObj.Width -}}
{{- $img800 := $imgObj -}}
{{- $img1280 := $imgObj -}}
{{- if gt $originalWidth 800 -}}
{{- $img800 = $imgObj.Resize "800x" -}}
{{- end -}}
{{- if gt $originalWidth 1280 -}}
{{- $img1280 = $imgObj.Resize "1280x" -}}
{{- end -}}
{{- $srcset := printf "%s 800w, %s 1280w" $img800.RelPermalink $img1280.RelPermalink -}}
{{- end -}}
{{- define "RenderImageCaption" -}}
{{- with .caption -}}
{{ . | markdownify }}
{{- end -}}
{{- end -}}
{{- $disableImageOptimizationMD := .Page.Site.Params.disableImageOptimizationMD | default false -}}
{{- $urlStr := .Destination | safeURL -}}
{{- $url := urls.Parse $urlStr -}}
{{- $altText := .Text -}}
{{- $caption := .Title -}}
{{- $isRemote := findRE "^(https?|data)" $url.Scheme -}}
{{- $resource := "" -}}
{{- if not $isRemote -}}
{{- $resource = or ($.Page.Resources.GetMatch $urlStr) (resources.Get $urlStr) -}}
{{- end -}}
{{- if $isRemote -}}
{{- template "RenderImageSimple" (dict "imgObj" "" "src" $urlStr "alt" $altText) -}}
{{- else if $resource -}}
{{- $isSVG := eq $resource.MediaType.SubType "svg" -}}
{{- $shouldOptimize := and (not $disableImageOptimizationMD) (not $isSVG) -}}
{{- if $shouldOptimize -}}
{{- template "RenderImageResponsive" (dict "imgObj" $resource "alt" $altText) -}}
{{- else -}}
{{/* Not optimize image
If it is an SVG file, pass the permalink
Otherwise, pass the resource to allow width and height attributes
*/}}
{{- if $isSVG -}}
{{- template "RenderImageSimple" (dict "imgObj" "" "src" $resource.RelPermalink "alt" $altText) -}}
{{- else -}}
{{- template "RenderImageSimple" (dict "imgObj" $resource "src" $resource.RelPermalink "alt" $altText) -}}
{{- end -}}
{{- end -}}
{{- else -}}
{{- template "RenderImageSimple" (dict "imgObj" "" "src" $urlStr "alt" $altText) -}}
{{- end -}}
{{- template "RenderImageCaption" (dict "caption" $caption) -}}