Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Improve automatic scaling of cover image (fixes blur in mobiles) #198

Merged
merged 1 commit into from
Jul 8, 2024
Merged

Improve automatic scaling of cover image (fixes blur in mobiles) #198

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions exampleSite/config.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,9 @@ enableEmoji = true
# The sections of the home page alternate styling. Mark invert as true to swap the styling of the sections
invertSectionColors = false

# Options used for automatic image generation. see: https://gohugo.io/content-management/image-processing/
image_options = "webp q90 lanczos photo"

[params.footer]
# Show contact icons for email/phone (if specified) in the footer of the page
showContactIcons = false
Expand Down
53 changes: 39 additions & 14 deletions layouts/_default/index.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,20 +7,45 @@

<!-- Welcome screen that scrolls out of view -->
{{ if not .Params.header_use_video }}
{{ with $img := resources.Get .Params.header_image }}
<style>
#site-head.withCenteredImage {
background-image: url('{{- $img.RelPermalink -}}'); /* Default for larger screens */
}
{{ range $size := slice 1280 1024 900 600 360 }}
{{- with $img.Resize ( printf "%dx lanczos webp photo q100" $size ) -}}
@media (max-width: {{- printf "%dpx" $size -}}) {
#site-head.withCenteredImage { background-image: url('{{- .RelPermalink -}}'); }
}
{{ end }}
{{- end -}}
</style>
{{ end }}
{{ with $img := resources.Get .Params.header_image }}
{{ $image_options := $.Site.Params.image_options | default "webp q90 lanczos photo" -}}
<style>
/* Default cover for larger screens, converted to webp */
{{- with $img.Resize ( printf "%dx%d %s" $img.Width $img.Height $image_options ) -}}
#site-head.withCenteredImage {
background-image: url('{{- .RelPermalink -}}');
}
{{- end -}}

/*
Lower resolutions, uncropped. Aimed at desktop users.
We set __both__ max-width and max-height to make sure the image is never upscaled.
*/
{{ range $width := slice 1920 1600 1366 }}
{{- with $img.Resize ( printf "%dx %s" $width $image_options ) }}
@media (max-width: {{- .Width -}}px) and (max-height: {{- .Height -}}px) {
#site-head.withCenteredImage { background-image: url('{{- .RelPermalink -}}'); }
}
{{- end }}
{{- end }}

/*
Lower resolutions, cropped to portrait. Useful for mobile. For "tall" displays (screen ratio < image ratio)
the "cover" algorithm first resizes the image to match the screen height, then __crops__ it to match the width.
We mimic this by resizing to height=1024, and then cropping to various widths. We set "max-height" to
ensure the height is never upscaled, but also max-aspect-ratio to ensure that each image is used in "tall-enough"
displays, in which our cropping would happen anyways!
*/
{{- $img_temp := $img.Resize "x1024 q100" -}}/* high quality temporary image, to be cropped later */
{{ range $width := slice 900 600 360 }}
{{- with $img_temp.Crop ( printf "%dx1024 center %s" $width $image_options ) }}
@media (max-height: {{- .Height -}}px) and (max-aspect-ratio: {{ .Width }} / {{ .Height }}) {
#site-head.withCenteredImage { background-image: url('{{- .RelPermalink -}}'); }
}
{{- end }}
{{- end }}
</style>
{{ end }}
<header id="site-head" class="withCenteredImage">
{{ else }}
<header id="site-head">
Expand Down