Class: TTFunk::Table::Sbix

Inherits:
TTFunk::Table show all
Defined in:
lib/ttfunk/table/sbix.rb

Overview

Standard Bitmap Graphics (sbix) table.

Defined Under Namespace

Classes: BitmapData

Instance Attribute Summary collapse

Attributes inherited from TTFunk::Table

#file, #length, #offset

Instance Method Summary collapse

Methods inherited from TTFunk::Table

#exists?, #initialize, #raw, #tag

Constructor Details

This class inherits a constructor from TTFunk::Table

Instance Attribute Details

#flags ⇒ Integer (readonly)

Flags.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/sbix.rb, line 15
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def flags

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  @flags

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end

#num_strikes ⇒ Integer (readonly)

Number of bitmap strikes.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/sbix.rb, line 19
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def num_strikes

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  @num_strikes

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end

#strikes ⇒ Array<Hash> (readonly)

Strikes.

Returns:

  • (Array<Hash>)
Source Code
lib/ttfunk/table/sbix.rb, line 23
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def strikes

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  @strikes

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end

#version ⇒ Integer (readonly)

Table version.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/sbix.rb, line 11
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def version

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  @version

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end

Instance Method Details

#all_bitmap_data_for(glyph_id) ⇒ Array<BitmapData>

Get all bitmaps for glyph.

Parameters:

  • glyph_id (Integer)

Returns:

Source Code
lib/ttfunk/table/sbix.rb, line 72
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def all_bitmap_data_for(glyph_id)

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  strikes.each_index.filter_map { |strike_index|

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    bitmap_data_for(glyph_id, strike_index)

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  }

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end

#bitmap_data_for(glyph_id, strike_index) ⇒ BitmapData

Get bitmap for glyph strike.

Parameters:

  • glyph_id (Integer)
  • strike_index (Integer)

Returns:

Source Code
lib/ttfunk/table/sbix.rb, line 49
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def bitmap_data_for(glyph_id, strike_index)

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  strike = strikes[strike_index]

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  return if strike.nil?

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  glyph_offset = strike[:glyph_data_offset][glyph_id]

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  next_glyph_offset = strike[:glyph_data_offset][glyph_id + 1]

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  if glyph_offset && next_glyph_offset

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    bytes = next_glyph_offset - glyph_offset

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    if bytes.positive?

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      parse_from(offset + strike[:offset] + glyph_offset) {

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        x, y, type = read(8, 's2A4')

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        data = StringIO.new(io.read(bytes - 8))

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        BitmapData.new(x, y, type, data, strike[:ppem], strike[:resolution])

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      }

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    end

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  end

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end