EXTTEXTMETRIC structure (prntfont.h)
The EXTTEXTMETRIC structure is used to specify font-specific information within Unidrv font metrics files (.ufm files).
Syntax
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;
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.
Requirements
Requirement | Value |
---|---|
Header | prntfont.h (include Prntfont.h) |