Class: Fontico::Emitters::Font

Inherits:
Object
  • Object
show all
Defined in:
lib/fontico/emitters/font.rb

Overview

A TTF for Prawn. Not for the web: at this icon count the sprite is both smaller over the wire and not render-blocking. Prawn reads TTF/OTF via ttfunk and cannot read woff2, so TTF is the right container here.

Instance Method Summary collapse

Constructor Details

#initialize(manifest, build, lock: nil, outliner: nil, output: nil) ⇒ Font

Returns a new instance of Font.



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# File 'lib/fontico/emitters/font.rb', line 9

def initialize(manifest, build, lock: nil, outliner: nil, output: nil)
  @manifest = manifest
  @build = build
  @lock = lock
  @outliner = outliner || Outliner.new
  @output = output
end

Instance Method Details

#accepts?(icon) ⇒ Boolean

Glyphs store no colour, so multicolour icons cannot be represented at all. They stay in the sprite and the build names each one it dropped.

Returns:

  • (Boolean) 


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# File 'lib/fontico/emitters/font.rb', line 19

def accepts?(icon) = !(@lock&.multicolor?(icon.name) || icon.multicolor?)

#call ⇒ Object 



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# File 'lib/fontico/emitters/font.rb', line 22

def call
  unsupported = @build.select { |icon, body| @outliner.strategy_for(icon, body) == :none }
  @outliner.refuse(unsupported.map(&:first)) if unsupported.any?

  outlines = @outliner.outlines(@build, size: @manifest.size)

  glyphs = @build.map do |icon, body|
    { name: icon.key,
      codepoint: @lock.codepoint_for(icon.name),
      svg: document(outlines[icon.name], body) }
  end

  result = @outliner.instance_variable_get(:@runner)
                    .run("build_font.mjs", {
                           fontName: "fontico", size: @manifest.size,
                           output: @output, glyphs: glyphs
                         })
  if result["empty"]&.any?
    raise Fontico::Error, <<~MSG
      #{result["empty"].size} icon(s) produced an empty glyph and would ship invisible:

        #{result["empty"].join("\n  ")}

      The usual cause is live <text> in the source SVG, which has no outline
      to convert. Convert text to paths (Path > Object to Path), or remove
      the icon from the font target.
    MSG
  end

  result
end

#rules_only? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fontico/emitters/font.rb', line 20

def rules_only? = false