diff options
Diffstat (limited to 'layouts')
| -rw-r--r-- | layouts/shortcodes/img.html | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/layouts/shortcodes/img.html b/layouts/shortcodes/img.html new file mode 100644 index 0000000..fbf96c0 --- /dev/null +++ b/layouts/shortcodes/img.html @@ -0,0 +1,84 @@ +{{/* + Taken from https://www.brycewray.com/posts/2022/06/responsive-optimized-images-hugo/ +*/}} + +{{- $respSizes := .Site.Params.imageSizes -}} +{{- $src := .Get "src" -}} +{{- $source := resources.Get $src -}} +{{- $alt := .Get "alt" -}} +{{- $divClass := .Get "divClass" -}} +{{/* + The styling in $imgClass, below, makes + an image fill the container horizontally + and adjust its height automatically + for that, and then fade in for the LQIP effect. + Feel free to adjust your CSS/SCSS as desired. +*/}} +{{- $imgClass := "animate-fade" -}} +{{- $dataSzes := "(min-width: 1024px) 100vw, 50vw" -}} +{{/* + Now we'll create the 20-pixel-wide LQIP + and turn it into Base64-encoded data, which + is better for performance and caching. +*/}} +{{- $LQIP_img := $source.Resize "20x jpg" -}} +{{- $LQIP_b64 := $LQIP_img.Content | base64Encode -}} +{{/* + $CFPstyle is for use in styling + the div's background, as you'll see shortly. +*/}} +{{- $CFPstyle := printf "%s%s%s%v%s" "background: url(data:image/jpeg;base64," $LQIP_b64 "); background-size: cover; background-repeat: no-repeat; width: " $source.Width "px;" -}} +{{/* + Then, we create a 640-pixel-wide JPG + of the image. This will serve as the + "fallback" image for that tiny percentage + of browsers that don't understand the + HTML `picture` tag. +*/}} +{{- $actualImg := $source.Resize "640x jpg" -}} +<div class="picture{{with $divClass}} {{.}}{{end}}" style="{{ $CFPstyle | safeCSS }}"> +{{/* + Now we'll build the `picture` which modern + browsers use to decide which image, and + which format thereof, to show. Remember to + put `webp` first, since the browser will use + the first format it **can** use, and WebP files + usually are smaller. After WebP, the fallback + is the universally safe JPG format. +*/}} + <a href="{{ $source.RelPermalink }}"> + <picture> + <source + type="image/webp" + srcset=" + {{- with $respSizes -}} + {{- range $i, $e := $respSizes -}} + {{- if ge $source.Width . -}} + {{- if $i }}, {{ end -}}{{- ($source.Resize (printf "%vx%v" $e " webp") ).RelPermalink }} {{ . }}w + {{- end -}} + {{- end -}} + {{- end -}}" + sizes="{{ $dataSzes }}" + /> + <source + type="image/jpeg" + srcset=" + {{- with $respSizes -}} + {{- range $i, $e := . -}} + {{- if ge $source.Width . -}} + {{- if $i }}, {{ end -}}{{- ($source.Resize (printf "%vx%v" . " jpg") ).RelPermalink }} {{ . }}w + {{- end -}} + {{- end -}} + {{- end -}}" + sizes="{{ $dataSzes }}" + /> + <img class="{{ $imgClass }}" + src="{{ $actualImg.RelPermalink }}" + width="{{ $source.Width }}" + height="{{ $source.Height }}" + alt="{{ $alt }}" + loading="lazy" + /> + </picture> + </a> +</div> |
