Class: Fontisan::Models::BitmapStrike

Inherits:
Lutaml::Model::Serializable
  • Object
show all
Defined in:
lib/fontisan/models/bitmap_strike.rb

Overview

Bitmap strike representation model

Represents a bitmap strike (size) from the CBLC table. Each strike contains bitmap glyphs at a specific ppem (pixels per em) size.

This model uses lutaml-model for structured serialization to YAML/JSON/XML.

Examples:

Creating a bitmap strike

strike = BitmapStrike.new
strike.ppem = 16
strike.start_glyph_id = 10
strike.end_glyph_id = 100
strike.bit_depth = 32

Serializing to JSON

json = strike.to_json
# {
#   "ppem": 16,
#   "start_glyph_id": 10,
#   "end_glyph_id": 100,
#   "bit_depth": 32
# }

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#bit_depth ⇒ Integer

Returns Bit depth (1, 2, 4, 8, or 32).

Returns:

  • (Integer) —

    Bit depth (1, 2, 4, 8, or 32)



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# File 'lib/fontisan/models/bitmap_strike.rb', line 44

attribute :bit_depth, :integer

#end_glyph_id ⇒ Integer

Returns Last glyph ID in this strike.

Returns:

  • (Integer) —

    Last glyph ID in this strike



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# File 'lib/fontisan/models/bitmap_strike.rb', line 40

attribute :end_glyph_id, :integer

#num_glyphs ⇒ Integer

Returns Number of glyphs in this strike.

Returns:

  • (Integer) —

    Number of glyphs in this strike



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# File 'lib/fontisan/models/bitmap_strike.rb', line 48

attribute :num_glyphs, :integer

#ppem ⇒ Integer

Returns Pixels per em (square pixels).

Returns:

  • (Integer) —

    Pixels per em (square pixels)



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# File 'lib/fontisan/models/bitmap_strike.rb', line 32

attribute :ppem, :integer

#start_glyph_id ⇒ Integer

Returns First glyph ID in this strike.

Returns:

  • (Integer) —

    First glyph ID in this strike



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# File 'lib/fontisan/models/bitmap_strike.rb', line 36

attribute :start_glyph_id, :integer

Instance Method Details

#color? ⇒ Boolean

Check if this is a color strike (32-bit)

Returns:

  • (Boolean) —

    True if 32-bit color



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# File 'lib/fontisan/models/bitmap_strike.rb', line 82

def color?
  bit_depth == 32
end

#color_depth ⇒ String

Get the color depth description

Returns:

  • (String) —

    Human-readable color depth



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# File 'lib/fontisan/models/bitmap_strike.rb', line 68

def color_depth
  case bit_depth
  when 1 then "1-bit (monochrome)"
  when 2 then "2-bit (4 colors)"
  when 4 then "4-bit (16 colors)"
  when 8 then "8-bit (256 colors)"
  when 32 then "32-bit (full color with alpha)"
  else "#{bit_depth}-bit"
  end
end

#glyph_range ⇒ Range

Get glyph IDs covered by this strike

Returns:

  • (Range) —

    Range of glyph IDs



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# File 'lib/fontisan/models/bitmap_strike.rb', line 53

def glyph_range
  start_glyph_id..end_glyph_id
end

#includes_glyph?(glyph_id) ⇒ Boolean

Check if this strike covers a specific glyph ID

Parameters:

  • glyph_id (Integer) —

    Glyph ID to check

Returns:

  • (Boolean) —

    True if glyph is in range



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# File 'lib/fontisan/models/bitmap_strike.rb', line 61

def includes_glyph?(glyph_id)
  glyph_range.include?(glyph_id)
end

#monochrome? ⇒ Boolean

Check if this is a monochrome strike (1-bit)

Returns:

  • (Boolean) —

    True if 1-bit monochrome



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# File 'lib/fontisan/models/bitmap_strike.rb', line 89

def monochrome?
  bit_depth == 1
end