Additional Metrics

The additional metrics structure extends the metrics describing the font to include the PANOSE fields. The fields allow for quantitative descriptions of the visual properties of font faces. The format of the ADDITIONALMETRICS structure is:

typedef struct {
        ULONG       ulIdentity;
        ULONG       ulSize;
        PANOSE      panose;
} ADDITIONALMETRICS;

Where:

ulIdentity

PANOSE

The PANOSE definition consists of ten digits, each of which describes one of up to sixteen variations. The current digits are:

Family Kind (6 variations)
- Any 1
  2
  3
  4
  5
  2.
  - Any 1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    3.
    - Any 1
      2
      3
      4
      5
      6
      7
      8
      9
      10
      11
      4.
      - Any 1
        = No Fit
        2
        = Old Style
        3
        = Modern
        4
        = Even Width
        5
        = Expanded
        6
        = Condensed
        7
        = Very Expanded
        8
        = Very Condensed
        9
        = Monospaced
        5.
        Contrast (10 variations)
        
        Any 1
        = No Fit
        2
        = None
        3
        = Very Low
        4
        = Low
        5
        = Medium Low
        6
        = Medium
        7
        = Medium High
        8
        = High
        9
        = Very High
        6.
        Stroke Variation (9 variations)
        
        Any 1
        = No Fit
        2
        = Gradual/Diagonal
        3
        = Gradual/Transitional
        4
        = Gradual/Vertical
        5
        = Gradual/Horizontal
        6
        = Rapid/Vertical
        7
        = Rapid/Horizontal
        8
        = Instant/Vertical
        7.
        Arm Style (12 variations)
        
        Any 1
        = No Fit
        2
        = Straight Arms/Horizontal
        3
        = Straight Arms/Wedge
        4
        = Straight Arms/Vertical
        5
        = Straight Arms/Single Serif
        6
        = Straight Arms/Double Serif
        7
        = Non-Straight Arms/Horizontal
        8
        = Non-Straight Arms/Wedge
        9
        = Non-Straight Arms/Vertical
        10
        = Non-Straight Arms/Single Serif
        11
        = Non-Straight Arms/Double Serif
        8.
        Letterform (16 variations)
        
        Any 1
        = No Fit
        2
        = Normal/Contact
        3
        = Normal/Weighted
        4
        = Normal/Boxed
        5
        = Normal/Flattened
        6
        = Normal/Rounded
        7
        = Normal/Off Center
        8
        = Normal/Square
        9
        = Oblique/Contact
        10
        = Oblique/Weighted
        11
        = Oblique/Boxed
        12
        = Oblique/Flattened
        13
        = Oblique/Rounded
        14
        = Oblique/Off Center
        15
        = Oblique/Square
        9.
        Midline (14 variations)
        
        Any 1
        = No Fit
        2
        = Standard/Trimmed
        3
        = Standard/Pointed
        4
        = Standard/Serifed
        5
        = High/Trimmed
        6
        = High/Pointed
        7
        = High/Serifed
        8
        = Constant/Trimmed
        9
        = Constant/Pointed
        10
        = Constant/Serifed
        11
        = Low/Trimmed
        12
        = Low/Pointed
        13
        = Low/Serifed
        10.
        X-height (8 variations)
        
        Any 1
        = No Fit
        2
        = Constant/Small
        3
        = Constant/Standard
        4
        = Constant/Large
        5
        = Ducking/Small
        6
        = Ducking/Standard
        7
        = Ducking/Large
        
        When using the PANOSE number to match fonts, the ordering of the PANOSE digit is the key to finding the closest match. The most significant digit is the first digit, and the least significant digit is number ten. To find matches, the digits need to be compared, in the order given. A font mapper may want to change the precedence of the digits, to give higher weightings to other font features.
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