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Update images.Text filter
- Use Lato instead of Roboto in example; Google reorganized fonts repo and removed some static files. - Describe default font
This commit is contained in:
Joe Mooring
Joe Mooring
parent
315d2f8c34
commit
7d5a13d8db
@ -21,7 +21,9 @@ color
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: (`string`) The font color, either a 3-digit or 6-digit hexadecimal color code. Default is `#ffffff` (white).
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: (`string`) The font color, either a 3-digit or 6-digit hexadecimal color code. Default is `#ffffff` (white).
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font
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font
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: (`resource.Resource`) The font can be a [global resource], a [page resource], or a [remote resource]. Default is the "Go Regular" TrueType font.
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: (`resource.Resource`) The font can be a [global resource], a [page resource], or a [remote resource]. Default is [Go Regular], a proportional sans-serif TrueType font.
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[Go Regular]: https://go.dev/blog/go-fonts#sans-serif
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linespacing
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linespacing
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: (`int`) The number of pixels between each line. For a line height of 1.4, set the `linespacing` to 0.4 multiplied by the `size`. Default is `2`.
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: (`int`) The number of pixels between each line. For a line height of 1.4, set the `linespacing` to 0.4 multiplied by the `size`. Default is `2`.
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@ -45,7 +47,7 @@ Capture the font as a resource:
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```go-html-template
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```go-html-template
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{{ $font := "" }}
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{{ $font := "" }}
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{{ $path := "https://github.com/google/fonts/raw/main/apache/roboto/static/Roboto-Regular.ttf" }}
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{{ $path := "https://github.com/google/fonts/raw/main/ofl/lato/Lato-Regular.ttf" }}
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{{ with resources.GetRemote $path }}
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{{ with resources.GetRemote $path }}
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{{ with .Err }}
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{{ with .Err }}
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{{ errorf "%s" . }}
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{{ errorf "%s" . }}
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374
layouts/shortcodes/img.html
Normal file
374
layouts/shortcodes/img.html
Normal file
@ -0,0 +1,374 @@
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{{- /*
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Renders the given image using the given filter, if any.
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@param {string} src The path to the image which must be a remote, page, or global resource.
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@param {string} [filter] The filter to apply to the image (case-insensitive).
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@param {string} [filterArgs] A comma-delimited list of arguments to pass to the filter.
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@param {bool} [example=false] If true, renders a before/after example.
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@param {int} [exampleWidth=384] Image width, in pixels, when rendering a before/after example.
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@returns {template.HTML}
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@examples
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{{< img src="zion-national-park.jpg" >}}
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{{< img src="zion-national-park.jpg" alt="Zion National Park" >}}
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{{< img
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src="zion-national-park.jpg"
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alt="Zion National Park"
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filter="grayscale"
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>}}
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{{< img
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src="zion-national-park.jpg"
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alt="Zion National Park"
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filter="process"
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filterArgs="resize 400x webp"
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>}}
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{{< img
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src="zion-national-park.jpg"
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alt="Zion National Park"
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filter="colorize"
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filterArgs="180,50,20"
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>}}
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{{< img
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src="zion-national-park.jpg"
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alt="Zion National Park"
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filter="grayscale"
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example=true
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>}}
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{{< img
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src="zion-national-park.jpg"
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alt="Zion National Park"
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filter="grayscale"
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example=true
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exampleWidth=400
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>}}
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When using the text filter, provide the arguments in this order:
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0. The text
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1. The horizontal offset, in pixels, relative to the left of the image (default 20)
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2. The vertical offset, in pixels, relative to the top of the image (default 20)
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3. The font size in pixels (default 64)
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4. The line height (default 1.2)
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5. The font color (default #ffffff)
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{{< img
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src="images/examples/zion-national-park.jpg"
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alt="Zion National Park"
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filter="Text"
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filterArgs="Zion National Park,25,250,56"
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example=true
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>}}
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When using the padding filter, provide all arguments in this order:
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0. Padding top
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1. Padding right
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2. Padding bottom
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3. Padding right
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4. Canvas color
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{{< img
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src="images/examples/zion-national-park.jpg"
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alt="Zion National Park"
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filter="Padding"
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filterArgs="20,50,20,50,#0705"
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example=true
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>}}
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*/}}
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{{- /* Initialize. */}}
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{{- $alt := "" }}
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{{- $src := "" }}
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{{- $filter := "" }}
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{{- $filterArgs := slice }}
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{{- $example := false }}
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{{- $exampleWidth := 384 }}
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{{- /* Default values to use with the text filter. */}}
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{{ $textFilterOpts := dict
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"xOffset" 20
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"yOffset" 20
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"fontSize" 64
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"lineHeight" 1.2
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"fontColor" "#ffffff"
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"fontPath" "https://github.com/google/fonts/raw/main/ofl/lato/Lato-Regular.ttf"
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}}
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{{- /* Get and validate parameters. */}}
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{{- with .Get "alt" }}
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{{- $alt = .}}
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{{- end }}
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{{- with .Get "src" }}
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{{- $src = . }}
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{{- else }}
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{{- errorf "The %q shortcode requires a file parameter. See %s" .Name .Position }}
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{{- end }}
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{{- with .Get "filter" }}
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{{- $filter = . | lower }}
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{{- end }}
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{{- $validFilters := slice
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"brightness" "colorbalance" "colorize" "contrast" "gamma" "gaussianblur"
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"grayscale" "hue" "invert" "none" "opacity" "overlay" "padding" "pixelate"
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"process" "saturation" "sepia" "sigmoid" "text" "unsharpmask"
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}}
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{{- with $filter }}
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{{- if not (in $validFilters .) }}
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{{- errorf "The filter passed to the %q shortcode is invalid. The filter must be one of %s. See %s" $.Name (delimit $validFilters ", " ", or ") $.Position }}
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{{- end }}
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{{- end }}
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{{- with .Get "filterArgs" }}
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{{- $filterArgs = split . "," }}
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{{- $filterArgs = apply $filterArgs "trim" "." " " }}
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{{- end }}
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{{- if in (slice "false" false 0) (.Get "example") }}
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{{- $example = false }}
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{{- else if in (slice "true" true 1) (.Get "example")}}
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{{- $example = true }}
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{{- end }}
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{{- with .Get "exampleWidth" }}
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{{- $exampleWidth = . | int }}
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{{- end }}
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{{- /* Get image. */}}
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{{- $ctx := dict "page" .Page "src" $src "name" .Name "position" .Position }}
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{{- $i := partial "inline/get-resource.html" $ctx }}
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{{- /* Resize if rendering before/after examples. */}}
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{{- if $example }}
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{{- $i = $i.Resize (printf "%dx" $exampleWidth) }}
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{{- end }}
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{{- /* Create filter. */}}
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{{- $f := "" }}
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{{- $ctx := dict "filter" $filter "args" $filterArgs "name" .Name "position" .Position }}
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{{- if eq $filter "brightness" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "percentage" "argValue" (index $filterArgs 0) "min" -100 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Brightness (index $filterArgs 0) }}
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{{- else if eq $filter "colorbalance" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 3) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "percentage red" "argValue" (index $filterArgs 0) "min" -100 "max" 500) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $ctx = merge $ctx (dict "argName" "percentage green" "argValue" (index $filterArgs 1) "min" -100 "max" 500) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $ctx = merge $ctx (dict "argName" "percentage blue" "argValue" (index $filterArgs 2) "min" -100 "max" 500) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.ColorBalance (index $filterArgs 0) (index $filterArgs 1) (index $filterArgs 2) }}
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{{- else if eq $filter "colorize" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 3) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "hue" "argValue" (index $filterArgs 0) "min" 0 "max" 360) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $ctx = merge $ctx (dict "argName" "saturation" "argValue" (index $filterArgs 1) "min" 0 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $ctx = merge $ctx (dict "argName" "percentage" "argValue" (index $filterArgs 2) "min" 0 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Colorize (index $filterArgs 0) (index $filterArgs 1) (index $filterArgs 2) }}
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{{- else if eq $filter "contrast" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "percentage" "argValue" (index $filterArgs 0) "min" -100 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Contrast (index $filterArgs 0) }}
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{{- else if eq $filter "gamma" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "gamma" "argValue" (index $filterArgs 0) "min" 0 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Gamma (index $filterArgs 0) }}
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{{- else if eq $filter "gaussianblur" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "sigma" "argValue" (index $filterArgs 0) "min" 0 "max" 1000) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.GaussianBlur (index $filterArgs 0) }}
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{{- else if eq $filter "grayscale" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 0) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $f = images.Grayscale }}
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{{- else if eq $filter "hue" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "shift" "argValue" (index $filterArgs 0) "min" -180 "max" 180) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Hue (index $filterArgs 0) }}
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{{- else if eq $filter "invert" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 0) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $f = images.Invert }}
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{{- else if eq $filter "opacity" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "opacity" "argValue" (index $filterArgs 0) "min" 0 "max" 1) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Opacity (index $filterArgs 0) }}
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{{- else if eq $filter "overlay" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 3) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $ctx := dict "src" (index $filterArgs 0) "name" .Name "position" .Position }}
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{{- $overlayImg := partial "inline/get-resource.html" $ctx }}
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{{- $f = images.Overlay $overlayImg (index $filterArgs 1 | float ) (index $filterArgs 2 | float) }}
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{{- else if eq $filter "padding" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 5) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $f = images.Padding
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(index $filterArgs 0 | int)
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(index $filterArgs 1 | int)
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(index $filterArgs 2 | int)
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(index $filterArgs 3 | int)
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(index $filterArgs 4)
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}}
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{{- else if eq $filter "pixelate" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "size" "argValue" (index $filterArgs 0) "min" 0 "max" 1000) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Pixelate (index $filterArgs 0) }}
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{{- else if eq $filter "process" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $f = images.Process (index $filterArgs 0) }}
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{{- else if eq $filter "saturation" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "percentage" "argValue" (index $filterArgs 0) "min" -100 "max" 500) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Saturation (index $filterArgs 0) }}
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{{- else if eq $filter "sepia" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "percentage" "argValue" (index $filterArgs 0) "min" 0 "max" 100) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Sepia (index $filterArgs 0) }}
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{{- else if eq $filter "sigmoid" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 2) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $filterArgs = apply $filterArgs "float" "." }}
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{{- $ctx = merge $ctx (dict "argName" "midpoint" "argValue" (index $filterArgs 0) "min" 0 "max" 1) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $ctx = merge $ctx (dict "argName" "factor" "argValue" (index $filterArgs 1) "min" -10 "max" 10) }}
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{{- template "validate-arg-value" $ctx }}
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{{- $f = images.Sigmoid (index $filterArgs 0) (index $filterArgs 1) }}
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{{- else if eq $filter "text" }}
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{{- $ctx = merge $ctx (dict "argsRequired" 1) }}
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{{- template "validate-arg-count" $ctx }}
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{{- $ctx := dict "src" $textFilterOpts.fontPath "name" .Name "position" .Position }}
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{{- $font := or (partial "inline/get-resource.html" $ctx) }}
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{{- $fontSize := or (index $filterArgs 3 | int) $textFilterOpts.fontSize }}
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{{- $lineHeight := math.Max (or (index $filterArgs 4 | float) $textFilterOpts.lineHeight) 1 }}
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{{- $opts := dict
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"x" (or (index $filterArgs 1 | int) $textFilterOpts.xOffset)
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"y" (or (index $filterArgs 2 | int) $textFilterOpts.yOffset)
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||||||
|
"size" $fontSize
|
||||||
|
"linespacing" (mul (sub $lineHeight 1) $fontSize)
|
||||||
|
"color" (or (index $filterArgs 5) $textFilterOpts.fontColor)
|
||||||
|
"font" $font
|
||||||
|
}}
|
||||||
|
{{- $f = images.Text (index $filterArgs 0) $opts }}
|
||||||
|
{{- else if eq $filter "unsharpmask" }}
|
||||||
|
{{- $ctx = merge $ctx (dict "argsRequired" 3) }}
|
||||||
|
{{- template "validate-arg-count" $ctx }}
|
||||||
|
{{- $filterArgs = apply $filterArgs "float" "." }}
|
||||||
|
{{- $ctx = merge $ctx (dict "argName" "sigma" "argValue" (index $filterArgs 0) "min" 0 "max" 500) }}
|
||||||
|
{{- template "validate-arg-value" $ctx }}
|
||||||
|
{{- $ctx = merge $ctx (dict "argName" "amount" "argValue" (index $filterArgs 1) "min" 0 "max" 100) }}
|
||||||
|
{{- template "validate-arg-value" $ctx }}
|
||||||
|
{{- $ctx = merge $ctx (dict "argName" "threshold" "argValue" (index $filterArgs 2) "min" 0 "max" 1) }}
|
||||||
|
{{- template "validate-arg-value" $ctx }}
|
||||||
|
{{- $f = images.UnsharpMask (index $filterArgs 0) (index $filterArgs 1) (index $filterArgs 2) }}
|
||||||
|
{{- end }}
|
||||||
|
|
||||||
|
{{- /* Apply filter. */}}
|
||||||
|
{{- $fi := $i }}
|
||||||
|
{{- with $f }}
|
||||||
|
{{- $fi = $i.Filter . }}
|
||||||
|
{{- end }}
|
||||||
|
|
||||||
|
{{- /* Render. */}}
|
||||||
|
{{- if $example }}
|
||||||
|
<p>Original</p>
|
||||||
|
<img class='di ba b--black-20' style="width: initial;" src="{{ $i.RelPermalink }}" alt="{{ $alt }}">
|
||||||
|
<p>Processed</p>
|
||||||
|
<img class='di ba b--black-20' style="width: initial;" src="{{ $fi.RelPermalink }}" alt="{{ $alt }}">
|
||||||
|
{{- else -}}
|
||||||
|
<img class='di' style="width: initial;" src="{{ $fi.RelPermalink }}" alt="{{ $alt }}">
|
||||||
|
{{- end }}
|
||||||
|
|
||||||
|
{{- define "validate-arg-count" }}
|
||||||
|
{{- $msg := "When using the %q filter, the %q shortcode requires an args parameter with %d %s. See %s" }}
|
||||||
|
{{- if lt (len .args) .argsRequired }}
|
||||||
|
{{- $text := "values" }}
|
||||||
|
{{- if eq 1 .argsRequired }}
|
||||||
|
{{- $text = "value" }}
|
||||||
|
{{- end }}
|
||||||
|
{{- errorf $msg .filter .name .argsRequired $text .position }}
|
||||||
|
{{- end }}
|
||||||
|
{{- end }}
|
||||||
|
|
||||||
|
{{- define "validate-arg-value" }}
|
||||||
|
{{- $msg := "The %q argument passed to the %q shortcode is invalid. Expected a value in the range [%v,%v], but received %v. See %s" }}
|
||||||
|
{{- if or (lt .argValue .min) (gt .argValue .max) }}
|
||||||
|
{{- errorf $msg .argName .name .min .max .argValue .position }}
|
||||||
|
{{- end }}
|
||||||
|
{{- end }}
|
||||||
|
|
||||||
|
{{- define "partials/inline/get-resource.html" }}
|
||||||
|
{{- $r := "" }}
|
||||||
|
{{- $u := urls.Parse .src }}
|
||||||
|
{{- $msg := "The %q shortcode was unable to resolve %s. See %s" }}
|
||||||
|
{{- if $u.IsAbs }}
|
||||||
|
{{- with resources.GetRemote $u.String }}
|
||||||
|
{{- with .Err }}
|
||||||
|
{{- errorf "%s" }}
|
||||||
|
{{- else }}
|
||||||
|
{{- /* This is a remote resource. */}}
|
||||||
|
{{- $r = . }}
|
||||||
|
{{- end }}
|
||||||
|
{{- else }}
|
||||||
|
{{- errorf $msg $.name $u.String $.position }}
|
||||||
|
{{- end }}
|
||||||
|
{{- else }}
|
||||||
|
{{- with .page.Resources.Get (strings.TrimPrefix "./" $u.Path) }}
|
||||||
|
{{- /* This is a page resource. */}}
|
||||||
|
{{- $r = . }}
|
||||||
|
{{- else }}
|
||||||
|
{{- with resources.Get $u.Path }}
|
||||||
|
{{- /* This is a global resource. */}}
|
||||||
|
{{- $r = . }}
|
||||||
|
{{- else }}
|
||||||
|
{{- errorf $msg $.name $u.Path $.position }}
|
||||||
|
{{- end }}
|
||||||
|
{{- end }}
|
||||||
|
{{- end }}
|
||||||
|
{{- return $r}}
|
||||||
|
{{- end -}}
|
||||||
Loading…
x
Reference in New Issue
Block a user