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Add overlay_filter param to hero headers

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The `overlay_filter` param lets you darken or otherwise filter the hero header picture to make the text content pop out more.

You can use it by specifying the opacity (between 0 and 1) of a black overlay like so:

```yaml
excerpt: "This post should display a **header with an overlay image**, if the theme supports it."
header:
  overlay_image: unsplash-image-1.jpg
  overlay_filter: 0.5 # same as adding an opacity of 0.5 to a black background
  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
  cta_label: "More Info"
  cta_url: "https://unsplash.com"
```

Or if you want to do more fancy things, go full rgba: 

```yaml
excerpt: "This post should display a **header with an overlay image**, if the theme supports it."
header:
  overlay_image: unsplash-image-1.jpg
  overlay_filter: rgba(255, 0, 0, 0.5)
  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
  cta_label: "More Info"
  cta_url: "https://unsplash.com"
```
This commit is contained in:
Tobie Langel 2016-05-02 13:59:31 +02:00
parent b0e9c10ecb
commit f077ec4343
1 changed files with 8 additions and 2 deletions
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8
_includes/page__hero.html
View file

@ -18,8 +18,14 @@
{% capture overlay_img_path %}{{ page.header.overlay_image | prepend: "/images/" | prepend: base_path }}{% endcapture %}
{% endif %}
{% if page.header.overlay_filter contains "rgba" %}
{% capture overlay_filter %}{{ page.header.overlay_filter }}{% endcapture %}
{% elsif page.header.overlay_filter %}
{% capture overlay_filter %}rgba(0, 0, 0, {{ page.header.overlay_filter }}){% endcapture %}
{% endif %}
<div class="page__hero{% if page.header.overlay_color or page.header.overlay_image %}--overlay{% endif %}"
style="{% if page.header.overlay_color %}background-color: {{ page.header.overlay_color | default: 'transparent' }};{% endif %} {% if overlay_img_path %}background-image: url('{{ overlay_img_path }}');{% endif %}"
style="{% if page.header.overlay_color %}background-color: {{ page.header.overlay_color | default: 'transparent' }};{% endif %} {% if overlay_img_path %}background-image: {% if overlay_filter %}linear-gradient({{overlay_filter}}, {{overlay_filter}}), {% endif %}url('{{ overlay_img_path }}');{% endif %}"
>
{% if page.header.overlay_color or page.header.overlay_image %}
<div class="wrapper">