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|
    # Never fall back to allocating here. The builder has already
    # save!d the lock by the time it emits, so a codepoint minted now
    # would never reach disk: the font would ship a glyph that
    # Fontico.glyph cannot name. A nil is worse still — it reaches
    # String.fromCodePoint as null and maps the glyph to U+0000
    # without complaint.
    cp = @lock.codepoint_for(icon.name)
    raise Fontico::Error, "#{icon.name} has no codepoint in icons.lock" if cp.nil?

    { name: icon.key, codepoint: cp, 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, "      \#{result[\"empty\"].size} icon(s) produced an empty glyph and would ship invisible:\n\n        \#{result[\"empty\"].join(\"\\n  \")}\n\n      The usual cause is live <text> in the source SVG, which has no outline\n      to convert. Convert text to paths (Path > Object to Path), or remove\n      the icon from the font target.\n    MSG\n  end\n\n  result\nend\n"

#rules_only? ⇒ Boolean

Returns:

  • (Boolean) 


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

def rules_only? = false