Class: PDF::Reader::WidthCalculator::BuiltIn
- Inherits:
-
Object
- Object
- PDF::Reader::WidthCalculator::BuiltIn
- Defined in:
- lib/pdf/reader/width_calculator/built_in.rb
Overview
Type1 fonts can be one of 14 “built in” standard fonts. In these cases, the reader is expected to have it’s own copy of the font metrics. see Section 9.6.2.2, PDF 32000-1:2008, pp 256
Instance Method Summary collapse
- #glyph_width(code_point) ⇒ Object
-
#initialize(font) ⇒ BuiltIn
constructor
A new instance of BuiltIn.
Constructor Details
#initialize(font) ⇒ BuiltIn
Returns a new instance of BuiltIn.
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# File 'lib/pdf/reader/width_calculator/built_in.rb', line 24 def initialize(font) @font = font @@all_metrics ||= PDF::Reader::SynchronizedCache.new metrics_path = File.join(File.dirname(__FILE__), "..","afm","#{font.basefont}.afm") if File.file?(metrics_path) @metrics = @@all_metrics[metrics_path] ||= AFM::Font.new(metrics_path) else raise ArgumentError, "No built-in metrics for #{font.basefont}" end end |
Instance Method Details
#glyph_width(code_point) ⇒ Object
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# File 'lib/pdf/reader/width_calculator/built_in.rb', line 37 def glyph_width(code_point) return 0 if code_point.nil? || code_point < 0 m = @metrics.metrics_for(code_point) if m.nil? name = @font.encoding.int_to_name(code_point) m = @metrics.metrics_for_name(name) end if m m[:wx] elsif @font.widths[code_point - 1] @font.widths[code_point - 1] else raise ArgumentError, "Unknown glyph width for #{codepoint}" end end |