EXTTEXTMETRIC - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// prntfont.h

typedef struct _EXTTEXTMETRIC {
  short emSize;
  short emPointSize;
  short emOrientation;
  short emMasterHeight;
  short emMinScale;
  short emMaxScale;
  short emMasterUnits;
  short emCapHeight;
  short emXHeight;
  short emLowerCaseAscent;
  short emLowerCaseDescent;
  short emSlant;
  short emSuperScript;
  short emSubScript;
  short emSuperScriptSize;
  short emSubScriptSize;
  short emUnderlineOffset;
  short emUnderlineWidth;
  short emDoubleUpperUnderlineOffset;
  short emDoubleLowerUnderlineOffset;
  short emDoubleUpperUnderlineWidth;
  short emDoubleLowerUnderlineWidth;
  short emStrikeOutOffset;
  short emStrikeOutWidth;
  WORD  emKernPairs;
  WORD  emKernTracks;
} EXTTEXTMETRIC, *PEXTTEXTMETRIC;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-prntfont-_exttextmetric)

_EXTTEXTMETRIC structure

Description

The EXTTEXTMETRIC structure is used to specify font-specific information within Unidrv font metrics files (.ufm files).

Members

emSize

Specifies the size of the structure, in bytes.

emPointSize

Specifies the nominal point size of this font, in twips (1/20 of a point, or 1/1440 inch). This is the intended size of the font; the actual size may differ slightly depending on the resolution of the device.

emOrientation

Specifies the orientation of the font. The emOrientation member can be any of the following values:

Value Meaning
0 Either portrait or landscape orientation
1 Portrait orientation
2 Landscape orientation

emMasterHeight

Specifies the font size, in device units, for which the values in this font's extent table are exact.

emMinScale

Specifies the minimum valid point size for this font. The following equation illustrates how the minimum point size is determined:

smallest point size = (emMinScale * 72) / dfVertRes

The value 72 represents the number of points per inch. The dfVertRes value is the number of dots per inch.

emMaxScale

Specifies the maximum valid point size for this font. The following equation illustrates how the maximum point size is determined:

largest point size = (etmMaxScale * 72) / dfVertRes

The value 72 represents the number of points per inch. The dfVertRes value is the number of dots per inch.

emMasterUnits

Specifies the integral number of units per em, where an em equals the value of the emMasterHeight member. (That is, emMasterUnits is emMasterHeight expressed in font units instead of device units.)

emCapHeight

Specifies the height, in font units, of uppercase characters in the font. Typically, this is the height of uppercase H.

emXHeight

Specifies the height, in font units, of lowercase characters in the font. Typically, this is the height of lowercase x.

emLowerCaseAscent

Specifies the distance, in font units, that the ascender of lowercase letters extends above the base line. Typically, this is the height of lowercase d.

emLowerCaseDescent

Specifies the distance, in font units, that the descender of lowercase letters extends below the base line. Typically, this is specified for the descender of lowercase p.

emSlant

For an italic or slanted font, specifies the angle of the slant measured in tenths of a degree clockwise from the upright version of the font.

emSuperScript

Specifies the recommended amount, in font units, to offset superscript characters from the base line. This is typically a negative value.

emSubScript

Specifies the recommended amount, in font units, to offset subscript characters from the base line. This is typically a positive value.

emSuperScriptSize

Specifies the recommended size, in font units, of superscript characters for this font.

emSubScriptSize

Specifies the recommended size, in font units, of subscript characters for this font.

emUnderlineOffset

Specifies the offset, in font units, downward from the base line, where the top of a single underline bar should appear.

emUnderlineWidth

Specifies the thickness, in font units, of the underline bar.

emDoubleUpperUnderlineOffset

Specifies the offset, in font units, downward from the base line, where the top of the upper double-underline bar should appear.

emDoubleLowerUnderlineOffset

Specifies the offset, in font units, downward from the base line, where the top of the lower double-underline bar should appear.

emDoubleUpperUnderlineWidth

Specifies the thickness, in font units, of the upper underline bar.

emDoubleLowerUnderlineWidth

Specifies the thickness, in font units, of the lower underline bar.

emStrikeOutOffset

Specifies the offset, in font units, upward from the base line, where the top of a strikeout bar should appear.

emStrikeOutWidth

Specifies the thickness, in font units, of the strikeout bar.

emKernPairs

Specifies the number of character kerning pairs defined for this font.

emKernTracks

Specifies the number of kerning tracks defined for this font.

View the official Windows Driver Kit DDI reference

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