Class: TTFunk::Table::Maxp

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

Overview

Maximum Profile (maxp) table

Constant Summary collapse

DEFAULT_MAX_COMPONENT_DEPTH =

Default maximum levels of recursion.

1
MAX_V1_TABLE_LENGTH =

Size of full table version 1.

32

Instance Attribute Summary collapse

Attributes inherited from TTFunk::Table

#file, #length, #offset

Class 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

#max_component_contours ⇒ Integer (readonly)

Maximum contours in a composite glyph.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 37
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def max_component_contours

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  @max_component_contours

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end

#max_component_depth ⇒ Integer (readonly)

Maximum levels of recursion.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 77
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def max_component_depth

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  @max_component_depth

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end

#max_component_elements ⇒ Integer (readonly)

Maximum number of components referenced at “top level” for any composite glyph.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 73
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def max_component_elements

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  @max_component_elements

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end

#max_component_points ⇒ Integer (readonly)

Maximum points in a composite glyph.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 33
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def max_component_points

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  @max_component_points

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end

#max_contours ⇒ Integer (readonly)

Maximum contours in a non-composite glyph.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 29
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def max_contours

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  @max_contours

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end

#max_function_defs ⇒ Integer (readonly)

Number of FDEFs.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 55
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def max_function_defs

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  @max_function_defs

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end

#max_instruction_defs ⇒ Integer (readonly)

Number of IDEFs.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 59
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def max_instruction_defs

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  @max_instruction_defs

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end

#max_points ⇒ Integer (readonly)

Maximum points in a non-composite glyph.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 25
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def max_points

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  @max_points

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end

#max_size_of_instructions ⇒ Integer (readonly)

Maximum byte count for glyph instructions.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 68
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def max_size_of_instructions

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  @max_size_of_instructions

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end

#max_stack_elements ⇒ Integer (readonly)

Maximum stack depth across Font Program, CVT Program and all glyph instructions.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 64
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def max_stack_elements

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  @max_stack_elements

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end

#max_storage ⇒ Integer (readonly)

Number of Storage Area locations.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 51
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def max_storage

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  @max_storage

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end

#max_twilight_points ⇒ Integer (readonly)

Maximum points used in Z0.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 47
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def max_twilight_points

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  @max_twilight_points

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end

#max_zones ⇒ Integer (readonly)

Maximum zones.

  • 1 if instructions do not use the twilight zone (Z0)
  • 2 if instructions do use Z0

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 43
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def max_zones

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  @max_zones

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end

#num_glyphs ⇒ Integer (readonly)

The number of glyphs in the font.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 21
21
def num_glyphs

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  @num_glyphs

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end

#version ⇒ Integer (readonly)

Table version.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/maxp.rb, line 17
17
def version

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  @version

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end

Class Method Details

.encode(maxp, new2old_glyph) ⇒ String

Encode table.

Parameters:

  • maxp (TTFunk::Table::Maxp)
  • new2old_glyph (Hash{Integer => Integer}) —

    keys are new glyph IDs, values are old glyph IDs.

Returns:

  • (String)
Source Code
lib/ttfunk/table/maxp.rb, line 86
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def encode(maxp, new2old_glyph)

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  ''.b.tap do |table|

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    num_glyphs = new2old_glyph.length

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    table << [maxp.version, num_glyphs].pack('Nn')

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    if maxp.version == 0x10000

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      stats = stats_for(maxp, glyphs_from_ids(maxp, new2old_glyph.values))

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      table << [

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        stats[:max_points],

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        stats[:max_contours],

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        stats[:max_component_points],

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        stats[:max_component_contours],

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        # these all come from the fpgm and cvt tables, which

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        # we don't support at the moment

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        maxp.max_zones,

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        maxp.max_twilight_points,

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        maxp.max_storage,

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        maxp.max_function_defs,

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        maxp.max_instruction_defs,

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        maxp.max_stack_elements,

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        stats[:max_size_of_instructions],

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        stats[:max_component_elements],

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        stats[:max_component_depth],

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      ].pack('n*')

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    end

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  end

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end